CN214751074U - Optical lens assembly, camera module and electronic equipment - Google Patents

Abstract

The application provides an optical lens subassembly, camera module and electronic equipment. The optical lens assembly comprises a light-transmitting cover plate and a lens group which are coaxially arranged from an object side to an image side along an optical axis. The light-transmitting cover plate has a refractive power, and the following relationship is satisfied among a curvature radius R1 of an object side surface of the light-transmitting cover plate, a curvature radius R2 of an image side surface of the light-transmitting cover plate, and a center thickness d1 of the light-transmitting cover plate: r1> R2+ d 1; and the curvature radius R1 of the object side surface of the light-transmitting cover plate and the curvature radius R2 of the image side surface of the light-transmitting cover plate satisfy the following relation: 2< R1/R2<3.5, wherein R1>0, R2> 0; and the curvature radius R1 of the object side surface of the light-transmitting cover plate and the focal length f1 of the light-transmitting cover plate satisfy the following relation: -2< R1/f1< -1. The application provides an optical lens subassembly that the field angle and the volume that realize super wide angle are less, have camera module and have electronic equipment of this camera module of this optical lens subassembly.

Description

Optical lens assembly, camera module and electronic equipment

Technical Field

The application relates to the field of optics, concretely relates to optical lens subassembly, camera module and electronic equipment.

Background

With the development of the camera technology, people have higher and higher requirements on the functions of the camera. Among them, the camera has a super wide angle function, which is widely favored by people, and the field angle of the camera in the current electronic device is still to be improved, and people pursue miniaturization, lightness and thinness of the electronic device. Therefore, how to provide an optical lens assembly, a camera module and an electronic device which realize an ultra-wide angle of view and a small volume.

SUMMERY OF THE UTILITY MODEL

The application provides an optical lens subassembly that the field angle and the volume that realize super wide angle are less, have camera module and have electronic equipment of this camera module of this optical lens subassembly.

In a first aspect, an embodiment of the present application provides an optical lens assembly, including a transparent cover plate and a lens group coaxially disposed from an object side to an image side along an optical axis, wherein the transparent cover plate has a refractive power, and a radius of curvature R1 of an object side surface of the transparent cover plate, a radius of curvature R2 of an image side surface of the transparent cover plate, and a center thickness d1 of the transparent cover plate satisfy the following relationship: r1> R2+ d 1; and the curvature radius R1 of the object side surface of the light-transmitting cover plate and the curvature radius R2 of the image side surface of the light-transmitting cover plate satisfy the following relation: 2< R1/R2<3.5, wherein R1>0, R2> 0; and the curvature radius R1 of the object side surface of the light-transmitting cover plate and the focal length f1 of the light-transmitting cover plate satisfy the following relation: -2< R1/f1< -1.

In a second aspect, an embodiment of the present application provides a camera module, which includes a lens barrel and the optical lens assembly, where the lens barrel includes a first lens barrel and a second lens barrel that are connected together or independently arranged, the transparent cover plate is installed in the first lens barrel, the lens group is installed in the second lens barrel, and an object-side surface of the transparent cover plate protrudes from a side of the first lens barrel that deviates from the second lens barrel.

In a third aspect, an embodiment of the present application provides an electronic device, which includes a housing and the camera module, where at least portions of the first lens barrel and the light-transmitting cover plate are disposed outside the housing in a protruding manner, and the second lens barrel and the lens group are disposed in the housing.

According to the optical lens assembly, the light-transmitting cover plate is designed to have refractive power on light rays, so that the light-transmitting cover plate can be used as a protective light-transmitting cover plate of the lens group and also can be used as a part of the optical lens, and the light-transmitting cover plate is reused as a lens for optical imaging, so that the lengths of the light-transmitting cover plate and the lens group in the optical axis direction are reduced; the following relationship is satisfied by designing the object side surface curvature radius R1, the image side surface curvature radius R2, and the center thickness d1 of the light-transmitting cover plate: r1> R2+ d1, 2< R1/R2<3.5, wherein R1>0, R2>0, and at the same time, the radius of curvature R1 of the object-side surface and the focal length f1 of the light-transmitting cover plate satisfy the following relationship: 2< R1/f1< -1 > to form a light-transmitting cover plate in a shape similar to a "meniscus", wherein an object side surface of the light-transmitting cover plate is a convex surface, and the light-transmitting cover plate can receive light rays in a large angle range within a relatively small caliber range, so that a condition for realizing an ultra-wide angle of view of the optical lens assembly is created, namely, the field of view of the optical lens assembly is improved, and meanwhile, the light-transmitting cover plate also has a relatively small diameter, so that the optical lens assembly which realizes the ultra-wide angle of view and has a small volume is provided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

FIG. 2 is a schematic diagram of an optical imaging system provided by an embodiment of the present application;

FIG. 3 is an optical path diagram of the optical imaging system shown in FIG. 2;

fig. 4 is a cross-sectional view of a first camera module provided in an embodiment of the present application;

fig. 5 is a cross-sectional view of a second camera module provided in the embodiment of the present application;

fig. 6 is a perspective view of an electronic device provided in an embodiment of the present application;

FIG. 7 is a cross-sectional view of the electronic device shown in FIG. 6 taken along line A-A;

fig. 8 is an MTF curve of a camera module according to an embodiment of the present disclosure;

fig. 9 is a longitudinal chromatic aberration graph for imaging by the optical lens assembly provided in the embodiment of the present application;

fig. 10 is a graph of astigmatism of an image formed by the optical lens assembly according to the embodiment of the present application;

fig. 11 is a distortion curve diagram of imaging of the optical lens assembly provided in the embodiment of the present application.

The specification reference numbers:

an electronic device 1000; a camera module 100; an optical lens assembly 10; a light-transmitting cover plate 1; a lens group 2; a photosensitive element 20; an optical filter 30; a lens barrel 40; a first barrel 41; a second barrel 42; a second lens 22; a third lens 23; a fourth lens 24; a fifth lens 25; a sixth lens 26; a seventh lens 27; a diaphragm 28; a housing 300.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 inventive step, are within the scope of the present disclosure.

Generally, because super wide angle lens is accurate optical element, need carry out the precision protection, in the camera module, generally adopt the printing opacity apron to protect super wide angle lens, prevent that this super wide angle lens from receiving collision, wearing and tearing etc. also prevent simultaneously that impurity such as dust, water from soaking super wide angle lens interference light, influence the imaging quality. For a camera module, the field angle of the ultra-wide angle lens is difficult to be increased. One of the reasons why the field angle of the ultra-wide-angle lens cannot be increased is as follows: along with the increase of the angle of view of super wide-angle lens, in order to guarantee that the field of view of super wide-angle lens is not sheltered from, the size of the light-transmitting cover plate of camera module also can increase thereupon, and the angle of view of super wide-angle lens and the size increase curve of light-transmitting cover plate present tan functional relation, so, want to increase the angle of view of super wide-angle lens, then need increase the size of light-transmitting cover plate, consequently can't realize the super wide-angle lens of 180 angles of view, also do not benefit to the miniaturization of camera module yet, and be applied to in the miniaturized frivolous electronic equipment.

In view of the above, referring to fig. 1, an optical lens assembly 10 is provided in the present embodiment. The optical lens assembly 10 includes a light-transmissive cover plate 1 and a lens group 2 coaxially disposed along an optical axis (a dotted line in fig. 1) from an object side to an image side. The light-transmitting cover plate 1 has a refractive power. The refractive power is a refractive power of the optical system for reflecting the incident parallel light beam. In other words, the shape of the light-transmitting cover plate 1 provided by the present application is not a flat and uniform plate, but the object-side surface S1 of the light-transmitting cover plate 1 is a "lens" which is a curved surface and has a deflection capability to light rays. Functionally, the transparent cover plate 1 has the functions of protecting the lens group 2 and deflecting light, in other words, the transparent cover plate 1 is a part of the optical lens system.

For convenience of description, a side of the optical lens assembly 10 facing the object is defined as an object side, and a side of the optical lens assembly 10 facing the object image is defined as an image side. The surface of the light-transmitting cover plate 1 facing the object side is an object side surface S1 of the light-transmitting cover plate 1, and the surface of the light-transmitting cover plate 1 facing the image side is an image side surface S2 of the light-transmitting cover plate 1.

Optionally, the material of the transparent cover plate 1 includes sapphire glass or other optical materials with high hardness and scratch resistance, so that the transparent cover plate 1 has collision resistance and scratch resistance to protect the lens assembly 2. The lens group 2 is made of glass or plastic.

In this embodiment, the object-side surface S1 of the transparent cover plate 1 and the image-side surface S2 of the transparent cover plate 1 are both curved surfaces. A radius of curvature R1 of the object side surface S1 of the transparent cover plate 1 is larger than a radius of curvature R2 of the image side surface S2 of the transparent cover plate 1. In other words, the surface curvature of the image side surface S2 of the light-transmitting cover plate 1 is greater than the surface curvature of the object side surface S1 of the light-transmitting cover plate 1. Further, the following relationship is satisfied among a curvature radius R1 of the object side surface S1 of the transparent cover plate 1, a curvature radius R2 of the image side surface S2 of the transparent cover plate 1, and a center thickness d1 of the transparent cover plate 1: r1> R2+ d1, wherein R1>0 and R2> 0. Specifically, the central thickness of the light-transmitting cover plate 1 is a distance between an intersection point of the object-side surface S1 of the light-transmitting cover plate 1 on the optical axis and an intersection point of the image-side surface S2 of the light-transmitting cover plate 1 on the optical axis.

By designing the curvature radius of the object-side surface S1 and the image-side surface of the light-transmitting cover plate 1, the light-transmitting cover plate 1 is in a meniscus shape, the image-side surface S2 of the light-transmitting cover plate 1 is a convex curved surface, the propagation direction of an incident light beam is changed, for an incident light beam with a large field angle, after the light beam passes through the light-transmitting cover plate 1, the exit angle of the light beam is smaller than the incident angle, and then the light beam enters the subsequent lens group 2, and further the tan function relationship between the diameter size of the light-transmitting cover plate 1 of the module and the field angle of the camera module 100 is changed, so that the purpose of reducing the diameter of the light-transmitting cover plate 1 under the same field angle is achieved, namely, the image-side surface S2 of the light-transmitting cover plate 1 has a larger light receiving angle range, and the aperture of the light-transmitting cover plate 1 is relatively smaller, thereby creating conditions for realizing an ultra-wide angle for the optical lens assembly 10.

The difference between the exit angle and the incident angle of the light beam after passing through the transparent cover plate 1 increases as the degree of bending of the whole transparent cover plate 1 increases. Further, a curvature radius R1 of the object side surface S1 of the light-transmitting cover plate 1 and a curvature radius R2 of the image side surface S2 of the light-transmitting cover plate 1 satisfy the following relationship: 2< R1/R2< 3.5; wherein R1>0 and R2> 0. Optionally, the value of R1/R2 may be 2.01, 2.2, 2.5, 3, 3.2, 3.49, etc. to form the light-transmitting cover plate 1 with different bending degrees and different deflection effects on light rays, so as to promote the formation of different angles of view of the camera module 100.

By designing the radius of curvature R1 of the object side surface S1 of the light-transmitting cover plate 1 and the radius of curvature R2 of the image side surface S2 of the light-transmitting cover plate 1, the degree of curvature of the image side surface S2 of the light-transmitting cover plate 1 and the degree of curvature of the object side surface S1 of the light-transmitting cover plate 1 are designed, specifically, 2< R1/R2<3.5, so as to form the light-transmitting cover plate 1 in a meniscus shape. For the incident beam with a large field angle, the emergent angle of the light beam is smaller than the incident angle of the light beam, so that the incident beam with the large field angle is received and converged.

Wherein, the curvature radius R1 of the object side surface S1 of the transparent cover plate 1 and the focal length f1 of the transparent cover plate 1 satisfy the following relation: -2< R1/f1< -1. Optionally, the values of R1/f1 may be-1.8, -1.9, -1.6, -1.5, -1.3, -1.1, etc., which facilitates forming different angles of view of the camera module 100.

In the optical lens assembly 10 provided by the application, the light-transmitting cover plate 1 is designed to have refractive power to light rays, so that the light-transmitting cover plate 1 can be used as the protective light-transmitting cover plate 1 of the lens assembly 2 and also can be used as a part of the optical lens assembly 10, and the light-transmitting cover plate 1 is multiplexed into an optical imaging lens, so that the lengths of the light-transmitting cover plate 1 and the lens assembly 2 in the optical axis direction are reduced; by designing the radius of curvature R1 of the object side surface S1, the radius of curvature R2 of the image side surface, and the center thickness d1 of the transparent cover plate 1, the following relationship is satisfied: r1> R2+ d1, 2< R1/R2<3.5, wherein R1>0, R2>0, and at the same time, the radius of curvature R1 of the object-side surface and the focal length f1 of the light-transmitting cover plate 1 satisfy the following relationship: 2< R1/f1< -1 > to form a light-transmitting cover plate 1 shaped like a "meniscus", where the object-side surface S1 of the light-transmitting cover plate 1 is a convex surface capable of receiving light rays in a wide angle range within a relatively small aperture range, which creates a condition for the optical lens assembly 10 to realize a super-wide angle, that is, to improve the field angle of the optical lens assembly 10, and meanwhile, the light-transmitting cover plate 1 also has a relatively small diameter, so that the application provides the optical lens assembly 10 which realizes a super-wide angle and has a small volume.

A distance SAG1 in the optical axis direction of an intersection point of the object side surface S1 of the light-transmissive cover plate 1 on the optical axis and an effective radius vertex of the object side surface S1 of the light-transmissive cover plate 1 satisfies the following relationship: 0< SAG1< 1. Optionally, the value of the SAG1 may be 0.1, 0.4, 0.8, 0.99, and the like, and the value of the SAG1 is designed to realize a relatively large field angle under a relatively small aperture.

The effective caliber diameter D1 of the light-transmitting cover plate 1 and the total length TTL of the optical lens assembly 10 in the optical axis direction satisfy the following relationship: 0.5< D1/TTL < 1.5. The effective aperture diameter D1 of the light-transmitting cover plate 1 is the diameter of the outer circumference of the object-side surface S1 of the light-transmitting cover plate 1. TTL is an on-axis distance from the object side surface S1 of the light transmissive cover plate 1 to the image forming surface (the image forming surface is on the photosensitive element 20). The value of the D1/TTL can be 0.51, 0.8, 1, 1.2, 1.49, and the like, and the design can realize a relatively small total length of the optical lens assembly 10 while realizing a relatively large module field angle within a certain effective aperture range of the light-transmitting cover plate 1, that is, the optical lens assembly 10 has a small volume and a relatively large module field angle, thereby realizing an ultra-wide-angle lens. The "module field angle" described herein refers to the field angle of the camera module 100.

Optionally, the value range of D1 is 8-9 mm, the value range of TTL is 7.2-7.3 mm, and the field angle is greater than or equal to 150 °, for example, the field angle is 180 °, so as to realize that the optical lens assembly 10 has a small volume and a large module field angle, and to realize an ultra-wide angle lens.

The light-transmitting cover plate 1 has negative refractive power. Specifically, the object-side surface S1 of the light-transmitting cover plate 1 is convex. The image side surface S2 of the light-transmitting cover plate 1 is concave. Further, a radius of curvature of the object side surface S1 of the light-transmissive cover plate 1 is larger than a radius of curvature of the image side surface S2 of the light-transmissive cover plate 1. The transmission direction of the incident beam is changed by the light-transmitting cover plate 1, for the incident beam with a large field angle, after the light beam passes through the light-transmitting cover plate 1, the emergent angle of the light beam is smaller than the incident angle, and then the light beam enters the subsequent lens group 2, so that the tan function relation between the diameter size of the light-transmitting cover plate 1 of the module and the field angle of the module is changed, the purpose of reducing the diameter of the light-transmitting cover plate 1 under the same field angle is achieved, and the miniaturization and the ultra-wide angle of the optical lens component 10 are realized.

Referring to fig. 1, the application defines the transparent cover plate 1 as a first lens. The lens group 2 includes a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, and a seventh lens 27, which are coaxially disposed in order from the object side to the image side. At least one of the second lens element 22, the third lens element 23, the fourth lens element 24, the fifth lens element 25, the sixth lens element 26 and the seventh lens element 27 has negative refractive power, and at least one has positive refractive power. The lens group 2 adopts the lens with negative refractive power and positive refractive power to eliminate chromatic aberration, form a required light path, guide an ultra-wide-angle incident beam to an imaging end and improve imaging quality.

Alternatively, the plurality of lenses may be alternately arranged in the form of negative refractive power lenses, positive refractive power lenses, and the like. Of course, the lens with negative refractive power and the lens with negative refractive power can be disposed adjacently. Of course, the positive refractive power lens and the positive refractive power lens can be disposed adjacently.

Further, the optical lens assembly 10 further includes at least one diaphragm 28. The diaphragm 28 is used to control the amount of light entering. The aperture of the diaphragm 28 determines the size of the incident light amount, and the aperture of the diaphragm 28 can also adjust the depth of field, so that the depth of field can be adjusted by controlling the diaphragm. The specific structure of the diaphragm 28 includes, but is not limited to, the edge of a lens, a frame, a perforated shading screen, or the like.

Referring to fig. 1, the stop 28 is disposed between two adjacent lenses of the lens group 2. Optionally, the diaphragm 28 is located between the second lens 22 and the third lens 23; alternatively, the diaphragm 28 is located between the third lens 23 and the fourth lens 24; alternatively, the diaphragm 28 is located between the fourth lens 24 and the fifth lens 25. The diaphragm 28 is arranged between the second lens 22 and the fifth lens 25 to control the light beams to converge in the area between the second lens 22 and the fifth lens 25 of the lens group 2, so as to receive the light beams with large incidence angle, converge the light beams with large incidence angle and project the light beams to the imaging area.

In this embodiment, referring to fig. 1, the second lens element 22 has negative refractive power. The third lens element 23 has positive refractive power. The fourth lens element 24 has positive refractive power. The fifth lens element 25 has negative refractive power. The sixth lens element 26 has positive refractive power. The seventh lens element 27 has negative refractive power. The diaphragm is located between the third lens 23 and the fourth lens 24.

Referring to fig. 1, the second lens element 22 has negative refractive power. Optionally, the object-side surface S3 of the second lens element 22 and the image-side surface S4 of the second lens element 22 are of a convex shape at a paraxial region and the image-side surface S4 of the second lens element 22 is of a concave shape at a paraxial region, but are not limited to the convex shape at the object-side surface S3 of the second lens element 22. And/or the presence of a gas in the gas,

referring to fig. 1, the third lens element 23 has positive refractive power. Optionally, the object-side surface S5 of the third lens element 23 and the image-side surface S6 of the third lens element 23 are convex at a paraxial region thereof, including but not limited to the object-side surface S5 of the third lens element 23. The image-side surface S6 of the third lens element 23 is concave at a paraxial region. And/or the presence of a gas in the gas,

referring to fig. 1, the fourth lens element 24 has positive refractive power. Optionally, the object-side surface S7 of the fourth lens element 24 and the image-side surface S8 of the fourth lens element 24 are convex at a paraxial region thereof, including but not limited to the object-side surface S7 of the fourth lens element 24. The image-side surface S8 of the fourth lens element 24 is convex at a paraxial region. And/or the presence of a gas in the gas,

referring to fig. 1, the fifth lens element 25 has negative refractive power. Optionally, the object-side surface S9 of the fifth lens element 25 and the image-side surface S10 of the fifth lens element 25 are convex at a paraxial region thereof, including but not limited to the object-side surface S9 of the fifth lens element 25. The image-side surface S10 of the fifth lens element 25 is concave at a paraxial region. And/or the presence of a gas in the gas,

referring to fig. 1, the sixth lens element 26 has positive refractive power. Optionally, the object-side surface S11 of the sixth lens element 26 and the image-side surface S12 of the sixth lens element 26 are convex at a paraxial region thereof, including but not limited to the object-side surface S11 of the sixth lens element 26. The image-side surface S12 of the sixth lens element 26 is convex at the paraxial region. And/or the presence of a gas in the gas,

referring to fig. 1, the seventh lens element 27 with negative refractive power. Optionally, the object-side surface S13 of the seventh lens element 27 and the image-side surface S14 of the seventh lens element 27 are concave at a paraxial region thereof, including but not limited to the object-side surface S13 of the seventh lens element 27. The image-side surface S14 of the seventh lens element 27 is concave at a paraxial region.

The specific surface shape embodiments of the second lens 22 to the seventh lens 27 may be combined with each other.

Referring to fig. 1, the image side surface S2 and the object side surface S1 of the cover plate 1, the image side surface S4 and the object side surface S3 of the second lens 22, the image side surface S6 and the object side surface S5 of the third lens 23, the image side surface S8 and the object side surface S7 of the fourth lens 24, the image side surface S10 and the object side surface S9 of the fifth lens 25, the image side surface S12 and the object side surface S11 of the sixth lens 26, and the image side surface S14 and the object side surface S13 of the seventh lens 27 are spherical or aspheric.

Specifically, referring to fig. 1, at least one of the image-side surface S2 of the transparent cover 1, the object-side surface S1 of the transparent cover 1, the image-side surface S4 of the second lens 22, the object-side surface S3 of the second lens 22, the image-side surface S6 of the third lens 23, the object-side surface S5 of the third lens 23, the image-side surface S8 of the fourth lens 24, the object-side surface S7 of the fourth lens 24, the image-side surface S10 of the fifth lens 25, the object-side surface S9 of the fifth lens 25, the image-side surface S12 of the sixth lens 26, the object-side surface S11 of the sixth lens 26, the image-side surface S14 of the seventh lens 27, and the object-side surface S13 of the seventh lens 27 is aspheric.

The aspheric surface is beneficial to correcting the aberration of the optical lens system and improving the imaging quality of the optical lens system, and can be easily made into shapes other than spherical surfaces to obtain more control variables, so that the advantages of obtaining good imaging by a small number of lenses are achieved, the number of lenses is reduced, and the miniaturization is met.

The image side surface S2 and the object side surface S1 of the transparent cover plate 1 are spherical, and the spherical surface is a shape convenient for molding, and since the transparent cover plate 1 is made of sapphire glass, the image side surface S2 and the object side surface S1 of the transparent cover plate 1 are spherical, so as to facilitate processing and molding of the transparent cover plate 1.

Further, referring to fig. 1, the image-side surface S4 and the object-side surface S3 of the second lens element 22, the image-side surface S6 and the object-side surface S5 of the third lens element 23, the image-side surface S8 and the object-side surface S7 of the fourth lens element 24, the image-side surface S10 and the object-side surface S9 of the fifth lens element 25, the image-side surface S12 and the object-side surface S11 of the sixth lens element 26, and the image-side surface S14 and the object-side surface S13 of the seventh lens element 27 are aspheric.

The aspherical surface shape of each lens in the optical lens assembly 10 of the present embodiment satisfies the following equation:

where z is a distance from a vertex of the aspherical surface (the vertex refers to an intersection of the aspherical surface and the optical axis) when the aspherical surface is at a position having a height of r in the optical axis direction, c represents a curvature of the vertex of the curved surface (curvature of the aspherical surface), k represents a conic coefficient, r is a distance from a point on the aspherical surface to the vertex of the aspherical surface, and B, C, D, E, F, G, H represents fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth curved surface coefficients of the aspherical surface, respectively.

Referring to fig. 2, a camera module 100 according to an embodiment of the present disclosure is provided. The camera module 100 includes, but is not limited to, an ultra-wide-angle camera. The camera module 100 further includes a photosensitive element 20. The photosensitive element 20 is located on a side of the lens group 2 facing away from the transparent cover plate 1. The photosensitive element 20 includes, but is not limited to, a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS Sensor). The photosensitive element 20 may also be an image sensor. The photosensitive element 20 has an imaging area, external light beams are projected to the imaging area after being acted by the transparent cover plate 1 and the lens group 2 so as to collect external images, and the photosensitive element 20 converts light information into electric signals and then converts the electric signals into image information.

Optionally, referring to fig. 2, the camera module 100 further includes a filter 30. The optical filter 30 is located on a side of the lens assembly 2 away from the transparent cover plate 1. Specifically, the filter 30 may be disposed between the lens assembly 2 and the photosensitive element 20.

The optical filter 30 may be an infrared filter 30, which is used to filter light in other bands except for infrared light, reduce factors such as ghost stray light that are unfavorable for images, and improve imaging quality.

In the present embodiment, the full field angle FOV of the camera module 100 is 180 °. The camera module 100 of this embodiment designs the field angle FOV and the size of the imaging area according to the F- θ mapping relationship, and the camera module 100 satisfies the following relationship under the distortion-free condition: and y is EFFL x (FOV/2). Wherein y is a half of the image side diagonal image height of the camera module 100 (i.e. a half of the diagonal of the imaging area on the photosensitive element 20). The EFFL is an effective focal length of the camera module 100. Through the design, the imaging area of the camera module 100 can receive light rays with a full-field view angle of 180 degrees, and the use requirement of a 180-degree ultra-wide-angle camera is met.

Referring to fig. 3, the camera module 100 includes a lens barrel 40 and the optical lens assembly 10. The lens barrel 40 includes a first barrel 41 and a second barrel 42. The light-transmitting cover plate 1 is mounted in the first barrel 41 or on the end surface. The lens group 2 is mounted in the second barrel 42. The object side surface S1 of the light-transmitting cover plate 1 protrudes from the first barrel 41 away from the second barrel 42. That is, the object side surface S1 of the transparent cover 1 entirely protrudes from the surface of the first barrel 41 facing the object side, so that the object side surface S1 of the transparent cover 1 receives light rays with a large incident angle, and the field angle of the camera module 100 is facilitated to be 180 °.

Alternatively, the diameter of the light-transmissive cover plate 1 is different from the diameter of the lens group 2. Specifically, the diameter of the light-transmitting cover plate 1 is larger than that of the lens group 2, so that the diameter of the first barrel 41 is larger than that of the second barrel 42.

Optionally, referring to fig. 4, the first lens barrel 41 and the second lens barrel 42 are integrally connected, and the connecting manner is one-piece molding, snap-fit connection, screw fastening, gluing, and the like. By interconnecting the first barrel 41 and the second barrel 42 into a whole and then assembling the same with other structures of the camera module 100, on one hand, the transparent cover plate 1 can effectively protect the lenses in the lens group 2 during the assembling process and prevent the lenses from being scratched during the assembling process, on the other hand, the first barrel 41 and the second barrel 42 are fixedly butted to accurately control the distance between the transparent cover plate 1 and the second lens 22, and on the other hand, the sealing performance between the first barrel 41 and the second barrel 42 can be improved and the light leakage problem can be reduced. Of course, the first barrel 41 and the second barrel 42 are modularized to improve the impact resistance of the entire optical lens assembly 10.

Optionally, referring to fig. 3, the first barrel 41 and the second barrel 42 are disposed independently from each other. In other words, the first barrel 41 and the second barrel 42 are separated. The first lens barrel 41 and the second lens barrel 42 are arranged in a split type, so that the second lens barrel 42, the lens group 2, the optical filter 30 and the photosensitive element 20 form a module and are arranged inside the shell 300, the first lens barrel 41 and the light-transmitting cover plate 1 can be arranged outside the shell 300, different parts of the whole camera module 100 can be arranged on the shell 300 in different modes, the installation convenience is improved, and the space occupied by the camera module 100 inside the shell 300 is also reduced.

Referring to fig. 5, an electronic device 1000 according to an embodiment of the present application is provided. The electronic device 1000 includes a housing 300 and the camera module 100. Specifically, the electronic device 1000 is a mobile phone, the camera module 100 is a rear camera, and the housing 300 is a rear cover of the electronic device 1000.

Referring to fig. 6 and 7, in the present embodiment, the first barrel 41 and the second barrel 42 are of a split structure. At least a portion of the first barrel 41 and the transparent cover plate 1 is protruded out of the housing 300. The object-side surface S1 of the transparent cover plate 1 is entirely higher than the housing of the electronic device 1000, so as to ensure that the field of view of the camera module 100 is not blocked by the housing of the electronic device 1000, and support the camera module 100 to form a 180-degree field angle. The second barrel 42 and the lens group 2 are disposed in the housing 300.

Specifically, the first barrel 41 and the light-transmitting cover plate 1 mounted thereon are mounted on the housing 300 from outside the housing 300, the second barrel 42, the lens group 2, the photosensitive element 20 (see fig. 3), and the optical filter 30 (see fig. 3) are packaged into an integral module, the integral module is mounted in a center frame of the electronic device 1000, and a rear cover is mounted on the center frame, so that the light-transmitting cover plate 1 is aligned with the lens group 2.

By disposing the first barrel 41 and the light-transmitting cover plate 1 mounted thereon outside the housing 300, which is equivalent to disposing a part of the optical lens assembly 10 outside the housing 300, compared to the conventional art in which the optical lens assembly is disposed entirely inside the housing 300, the camera module 100 in the present application has a small length inside the housing 300 and a small size in the thickness direction of the electronic device 1000, thereby providing a possibility of further reducing the thickness of the electronic device 1000 and also reducing the space occupied inside the electronic device 1000.

The camera module 100 of the present application is further described with reference to the following embodiments.

Referring to fig. 2 again, the camera module 100 of the present embodiment sequentially includes, from an object side to an image side: the light-transmitting cover plate 1(L1), the second lens 22(P2), the third lens 23(P3), the fourth lens 24(P4), the fifth lens 25(P5), the sixth lens 26(P6), the seventh lens 27(P7), the filter 30 and the photosensitive element 20.

In this embodiment, the transparent cover plate 1, i.e., the first lens element, has negative refractive power, the object-side surface S1 is convex, and the image-side surface S2 is concave. Both the object-side surface S1 and the image-side surface S2 are spherical.

The second lens element 22 with negative refractive power has a convex object-side surface S3 at a paraxial region, a concave image-side surface S4 at a paraxial region, and aspheric object-side surface S3 and image-side surface S4.

The third lens element 23 with positive refractive power has a convex object-side surface S5 at a paraxial region thereof and a concave image-side surface S6 at a paraxial region thereof, and both the object-side surface S5 and the image-side surface S6 are aspheric.

The fourth lens element 24 with positive refractive power has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region, and both the object-side surface S7 and the image-side surface S8 are aspheric.

The fifth lens element 25 with negative refractive power has a convex object-side surface S9 at a paraxial region thereof and a concave image-side surface S10 at a paraxial region thereof, and both the object-side surface S9 and the image-side surface S10 are aspheric.

The sixth lens element 26 with positive refractive power has a convex object-side surface S11 at a paraxial region and a convex image-side surface S12 at a paraxial region, and both the object-side surface S11 and the image-side surface S12 are aspheric.

The seventh lens element 27 with negative refractive power has a concave object-side surface S13 at a paraxial region and a concave image-side surface S14 at a paraxial region, and both the object-side surface S13 and the image-side surface S14 are aspheric.

The value range of D1 is 8-9 mm, the value range of TTL is 7.2-7.3 mm, and the field angle is 180 degrees.

In the present embodiment, the optical imaging system in the camera module 100 satisfies the design parameters of tables 1 to 3 below.

TABLE 1 design parameters for each lens

TABLE 2 aspherical parameters of the lenses

TABLE 3 Camera Module parameters

By designing the surface type design, the refractive index, the thickness and the distance of the light-transmitting cover plates 1 to the seventh lens 27 in table 1 and table 2, the optical lens assembly 10 provided by the embodiment of the present application is obtained, and the requirements that the field angle is 180 ° and the aperture of the light-transmitting cover plate 1 is 8-9 mm are satisfied. The application provides a super wide angle camera module 100 based on protruding printing opacity apron 1, through adopting the printing opacity apron 1 that has refractive power to design the face type of printing opacity apron 1, and all carry out optical design to the face type of each lens in the lens group 2, solve the diameter of printing opacity apron 1 and along with the increase of camera lens angle of vision and the problem of sharp increase, make camera module 100's angle of vision reach more than 150 under the relatively less diameter size, further angle of vision reaches 180.

The present embodiment also performs simulation tests on various optical performances of the optical lens assembly 10 described above. Referring to fig. 8 to 11 together, fig. 8 is a graph illustrating a modulation transfer function of the optical lens assembly 10 according to an embodiment of the present disclosure. FIG. 9 is a graph of longitudinal chromatic aberration for imaging in an embodiment of the present application. Fig. 10 is a graph of astigmatism of an image formed by the optical lens assembly 10 according to an embodiment of the present application. Fig. 11 is a distortion graph of an image formed by the optical lens assembly 10 according to an embodiment of the present application.

As can be seen from the above test chart, as shown in fig. 8, the modulation transfer function (MTF for short) is a function of the ratio of the degree of modulation between the actual image and the ideal image to the spatial frequency. The modulation degree of the scene refers to the ratio of the difference between the maximum brightness and the minimum brightness in the scene or the image to the sum of the maximum brightness and the minimum brightness. The dashed and solid lines in fig. 8 are the modulation transfer function curves for the T and R directions, respectively. The solid lines in fig. 8 are modulation transfer function curves of 0 to 90 ° in the T direction, respectively, and the dotted lines in fig. 8 are modulation transfer function curves of 0 to 90 ° in the R direction, respectively. As can be seen from fig. 8, the modulation degree of the optical lens assembly 10 is high in both the T direction and the R direction. For example, a full field modulation greater than 0.5 at a spatial frequency of 110LP/mm (line pair/mm) has good resolution, where the resolution is the line pair that the optical lens 1 can resolve per mm. Therefore, the optical lens assembly 10 provided by the present embodiment has a high imaging sharpness.

As shown in fig. 9, the relationship between the longitudinal color difference values of 470nm, 510nm, 555nm, 610nm and 650nm and the focal length is shown from left to right in the 5 curves in fig. 9, and it can be seen from fig. 9 that the longitudinal color difference values of 470nm, 510nm, 555nm, 610nm and 650nm are all within ± 0.02 mm. It is demonstrated that the optical lens assembly 10 provided by the present embodiment has a small longitudinal color difference value, which is beneficial to improving the imaging quality.

As shown in fig. 10, the solid line curve in fig. 10 is an astigmatic field curve in the T direction, and the dotted line curve is an astigmatic field curve in the R direction. The 5 solid curves in fig. 10 are curves of astigmatic field values at wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm, respectively, as a function of focal length from left to right. The astigmatic field values of the optical lens assembly 10 of the present embodiment are within ± 0.05mm, which indicates that the astigmatism phenomenon is relatively weak.

As shown in FIG. 11, FIG. 11 is a graph showing distortion curves of light beams having wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm, respectively. The distortion value of the optical lens assembly 10 of the present embodiment is within a controllable range, which illustrates that the optical lens assembly 10 of the present embodiment has a better imaging effect.

The present application proposes to design the transparent cover plate 1 into a meniscus shape by changing the shape of the existing glass cover plate, and design the curvature radius and thickness of the object-side surface S1 and the image-side surface S2 of the transparent cover plate 1, so as to change the functional relationship between the diameter size of the transparent cover plate 1 of the module and the field angle of the module, so that the functional relationship is no longer tan, and further, compared with the transparent cover plate 1 of a flat plate shape, the diameter size of the transparent cover plate 1 is smaller to achieve the purpose of non-blocking imaging, so as to achieve ultra-wide-angle imaging at the field angle of 180 °, whereas the existing transparent cover plate 1 of a flat plate shape can limit the camera module 100 in the general electronic device 1000 to be unable to achieve ultra-wide-angle imaging at the field angle of 180 ° because light beams cannot enter. The application provides a printing opacity apron 1 has the power of buckling, and then is favorable to promoting the imaging quality of module, reduces the thickness of whole camera module 100.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the principles of the application, and it is intended that such changes and modifications be covered by the scope of the application.

Claims (14)

1. An optical lens assembly comprising a light-transmitting cover plate and a lens group coaxially disposed along an optical axis from an object side to an image side, wherein the light-transmitting cover plate has a refractive power, and a radius of curvature R1 of an object side surface of the light-transmitting cover plate, a radius of curvature R2 of an image side surface of the light-transmitting cover plate and a center thickness d1 of the light-transmitting cover plate satisfy the following relationship: r1> R2+ d 1; and the curvature radius R1 of the object side surface of the light-transmitting cover plate and the curvature radius R2 of the image side surface of the light-transmitting cover plate satisfy the following relation: 2< R1/R2<3.5, wherein R1>0, R2> 0; and the curvature radius R1 of the object side surface of the light-transmitting cover plate and the focal length f1 of the light-transmitting cover plate satisfy the following relation: -2< R1/f1< -1.

2. The optical lens assembly as claimed in claim 1, wherein a distance SAG1 in the optical axis direction between an intersection point of the object side surface of the light-transmissive cover plate on the optical axis and an effective radius apex of the object side surface of the light-transmissive cover plate satisfies the following relationship: 0< SAG1< 1.

3. The optical lens assembly as claimed in claim 1, wherein an effective aperture diameter D1 of the light-transmissive cover plate and a total length TTL of the optical lens assembly in the optical axis direction satisfy the following relationship: 0.5< D1/TTL < 1.5.

4. The optical lens assembly as claimed in claim 1, wherein the light-transmissive cover plate has a negative refractive power, and an object-side surface of the light-transmissive cover plate is convex and an image-side surface of the light-transmissive cover plate is concave.

5. The optical lens assembly of claim 1, wherein the material of the light-transmissive cover plate comprises sapphire glass, and/or the material of the lens assembly comprises glass or plastic.

6. The optical lens assembly as claimed in claim 1, wherein the light-transmissive cover plate is a first lens, and the lens group includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens coaxially disposed in order from an object side to an image side; the second lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power, the sixth lens element with positive refractive power, and the seventh lens element with negative refractive power.

7. The optical lens assembly as claimed in claim 6, wherein the object-side surface of the second lens element is convex at a paraxial region and the image-side surface of the second lens element is concave at a paraxial region; and/or the presence of a gas in the gas,

the third lens element has a convex object-side surface and a concave image-side surface; and/or the presence of a gas in the gas,

the object-side surface of the fourth lens element is convex at a paraxial region thereof, and the image-side surface of the fourth lens element is convex at a paraxial region thereof; and/or the presence of a gas in the gas,

an object-side surface of the fifth lens element is convex at a paraxial region thereof, and an image-side surface of the fifth lens element is concave at a paraxial region thereof; and/or the presence of a gas in the gas,

an object-side surface of the sixth lens element is convex at a paraxial region thereof, and an image-side surface of the sixth lens element is convex at a paraxial region thereof; and/or the presence of a gas in the gas,

the seventh lens element has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region.

8. The optical lens assembly of claim 6, wherein at least one of an object side surface of the light-transmitting cover plate, an image side surface of the second lens, an object side surface of the second lens, an image side surface of the third lens, an object side surface of the fourth lens, an image side surface of the fifth lens, an object side surface of the fifth lens, an image side surface of the sixth lens, an object side surface of the sixth lens, an image side surface of the seventh lens, and an object side surface of the seventh lens is aspheric.

9. The optical lens assembly as claimed in claim 8, wherein the image side surface and the object side surface of the light-transmissive cover plate are spherical; the image side surface and the object side surface of the second lens, the image side surface and the object side surface of the third lens, the image side surface and the object side surface of the fourth lens, the image side surface and the object side surface of the fifth lens, the image side surface and the object side surface of the sixth lens, and the image side surface and the object side surface of the seventh lens are aspheric.

10. The optical lens assembly of claim 6 further comprising an optical stop positioned between the second lens and the third lens, or between the third lens and the fourth lens, or between the fourth lens and the fifth lens.

11. A camera module, comprising a lens barrel and the optical lens assembly according to any one of claims 1 to 10, wherein the lens barrel comprises a first lens barrel and a second lens barrel connected together or disposed independently, the transparent cover plate is mounted on the first lens barrel, the lens assembly is mounted in the second lens barrel, and an object-side surface of the transparent cover plate protrudes integrally from a side of the first lens barrel away from the second lens barrel.

12. The camera module of claim 11, further comprising a photosensitive element on a side of the lens group facing away from the transparent cover plate; and/or the presence of a gas in the gas,

the camera module further comprises an optical filter, and the optical filter is located on one side, deviating from the light-transmitting cover plate, of the lens group.

13. The camera module of claim 11, wherein the camera module has a field angle FOV of 180 °; the camera module satisfies the following relation under the undistorted condition: y EFFL × (FOV/2); the y is half of the image side diagonal image height of the camera module, and the EFFL is the focal length of the camera module.

14. An electronic device, comprising a housing and the camera module according to any one of claims 11 to 13, wherein at least a portion of the first barrel and the transparent cover plate is protruded out of the housing, and the second barrel and the lens assembly are disposed in the housing.

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