CN113391427B

CN113391427B - Optical lens, camera module and terminal

Info

Publication number: CN113391427B
Application number: CN202010181041.0A
Authority: CN
Inventors: 叶海水; 刘天宇; 江依达
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2022-10-04
Anticipated expiration: 2040-03-13
Also published as: CN113391427A; WO2021179963A1

Abstract

The application provides an optical lens, a camera module and a terminal. The optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side. At least one of the first lens and the second lens is a glass lens, and the other lenses are glass lenses or plastic lenses. In this application, the temperature drift coefficient of optical lens is reduced through the cooperation use of glass lens and plastic lens. In addition, in the application, the first lens and the second lens are bonded to form a double-cemented lens, and spherical aberration, coma aberration, chromatic aberration and the like of the optical lens are corrected through the double-cemented lens, so that the optical lens can obtain a better shooting effect.

Description

Optical lens, camera module and terminal

Technical Field

The embodiment of the application relates to the field of lenses, in particular to an optical lens, a camera module and a terminal.

Background

The temperature drift of the optical lens means that the optical lens generates focus drift in a high-temperature environment or a low-temperature environment. The temperature drift generated by the lens can greatly influence the imaging effect of the optical lens. Especially for a telephoto lens, the longer the focal length of the lens, the more likely temperature drift occurs. In the prior art, a Voice Coil Motor (VCM) compensation or an algorithm compensation is generally adopted to reduce the temperature drift of the optical lens. However, the voice coil motor compensates for the temperature drift of the optical lens, which increases the power consumption and design difficulty of the voice coil motor, and is easy to enter the non-linear region of the voice coil motor. The temperature drift of the optical lens is compensated by adopting the algorithm, the computing power of an in-system programming (ISP) needs to be increased, meanwhile, the temperature drift of a hardware system needs to be stable, the requirement is high, and the compensation effect of the algorithm is limited. How to reduce the temperature drift of the optical lens in a simple and reverse manner is an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides an optical lens, include optical lens's camera module and include the terminal of camera module aims at realizing reducing optical lens's temperature through simple mode and floats, realizes good formation of image effect.

In a first aspect, an optical lens is provided. The optical lens comprises a plurality of lenses, wherein the lenses comprise a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged from an object side to an image side, the first lens and the second lens are glued to form a double-glued lens, the lenses are made of glass or plastic, and at least one of the first lens and the second lens is made of glass.

In the present application, a glass lens is used as the first lens or the second lens, and a glass lens or a plastic lens is used as the other lens. Because the relative refractive index temperature coefficient of glass lens is lower, the degree that the refractive index of glass lens changes along with the temperature is less promptly, consequently, the optical lens of this application compares the optical lens who adopts plastic lens entirely, and the temperature drift coefficient can reduce greatly. In general, the refractive index of the glass lens varies with temperature in accordance with the following relationship: dn/dT >0; the refractive index of the plastic lens changes with temperature, and the relation is as follows: the dn/dT is less than 0, and when the temperature changes, compensation can be generated between the glass lens and the plastic lens, so that the temperature drift of the optical lens is reduced. Furthermore, in this application, still form two cemented lens with first lens and second lens bonding, simple structure, light energy loss is little to can rectify optical lens's spherical aberration, coma, colour difference through two cemented lens, in order to obtain better shooting effect.

In some embodiments, the dual cemented lens has a positive optical power, the third lens has a positive optical power, and the fourth lens has a negative optical power. In the present embodiment, the aberration of the optical lens can be reduced by matching the focal powers of the lenses, so as to achieve a better shooting effect. Moreover, the double-cemented lens has positive focal power, and the capacity of the optical lens for converging external light can be improved through the double-cemented lens, so that the external light inlet quantity is increased, the total optical length TTL of the optical lens can be reduced, and the optical lens can be more suitable for thin equipment such as a mobile terminal.

In some embodiments, the first lens and the second lens have different abbe numbers. The optical path is adjusted through the first lens and the second lens with different dispersion coefficients, so that the dispersion of the optical lens can be reduced, and a better imaging effect is obtained.

In some embodiments, the focal power of the first lens is positive, the focal power of the second lens is negative, and the image-side surface of the first lens and the object-side surface of the second lens are bonded to each other, thereby obtaining the desired double-bonded lens.

In some embodiments, the object-side surface of the first lens is a convex surface, and the double cemented lens can improve the ability of the optical lens to converge external light, so as to increase the amount of light entering from the outside, and can reduce the total optical length TTL of the optical lens, so that the optical lens can be more suitable for a thin device such as a mobile terminal.

In some embodiments, the image-side surface and the object-side surface of the first lens and the second lens are spherical surfaces, so that the difficulty in manufacturing the first lens and the second lens is reduced. The object side surfaces and the image side surfaces of the third lens, the fourth lens and the fifth lens are aspheric surfaces, so that the optical lens with a better optical effect is obtained by designing parameters of the object side surfaces and the image side surfaces of the third lens, the fourth lens and the fifth lens.

In some embodiments, the optical lens satisfies the following relationship:

0.75≤TTL/f≤1.0；

wherein, TTL is the optical total length of the optical lens, and f is the effective focal length of the optical lens.

The optical lens of the application satisfies the above relational expression, namely when the optical lens can satisfy the required effective focal length f, the total optical length TTL of the optical lens can be smaller, so that when the optical lens is applied to a terminal, the terminal can realize better thinning.

In some embodiments, the optical lens satisfies the following relationship:

-2.2μm/℃≤△f/△℃≤1.4μm/℃；

wherein Δ f/. DELTA.C is the temperature drift coefficient of the optical lens.

The temperature drift coefficient of the optical lens of the application satisfies the above relational expression, namely the temperature drift coefficient of the optical lens is smaller, namely the focus drift of the optical lens under different temperature environments is smaller, so that the optical lens can have a better shooting effect under any environment.

In some embodiments, the temperature coefficient of relative refractive index β of at least one of the doublet, third, fourth and fifth lenses _x The following relation is satisfied:

-9×10 ^-5 ≤β _x ≤9×10 ^-5 。

the relative refractive index temperature coefficient of at least one lens of the optical lens meets the relational expression, namely, the refractive index of the lens is changed less under different temperature changes, so that the optical lens can have a better shooting effect under any environment.

In some embodiments, the focal length f of the cemented doublet ₁ The system focal length f of the optical lens satisfies the following relation:

0≤f ₁ /f≤1.5。

the relation specifies the range of the ratio of the focal length of the double-cemented lens to the focal length of the optical lens, represents the light condensation capacity of the double-cemented lens, and is beneficial to reducing the coma aberration and the axial chromatic aberration of the system.

In some embodiments, the optical lens has a vertical axis chromatic aberration of less than 3.6um and an axial chromatic aberration of less than 12um.

In some embodiments, the optical lens further includes a stop, which is located on an object side or an image side of the first lens, and is beneficial to reducing the outer diameter of the optical lens.

In a second aspect, the present application further provides a camera module. The camera module comprises a photosensitive element and the optical lens, the photosensitive element is located on the image side of the optical lens, and light rays are projected to the photosensitive element after passing through the optical lens.

The optical image obtained after passing through the optical lens is converted into an electric signal through the photosensitive element, and then subsequent steps such as image processing and the like are carried out, so that an image with good imaging quality can be obtained. In addition, the optical lens has smaller temperature drift, and can have better imaging quality at different temperatures. Consequently, the camera module of this application also can realize good formation of image quality.

In a third aspect, the present application provides a terminal. The terminal comprises an image processor and the camera module, wherein the image processor is in communication connection with the camera module, the camera module is used for acquiring image data and inputting the image data into the image processor, and the image processor is used for processing the image data output from the image processor.

In the application, the image data of the camera module is processed through the image processor so as to obtain better shot pictures or images. In addition, the optical lens has smaller temperature drift, and can have better imaging quality at different temperatures. Therefore, the terminal of the application can shoot images with good imaging quality.

Drawings

Fig. 1 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a terminal according to another embodiment of the present application.

Fig. 3 is a schematic view of the imaging principle of the terminal shown in fig. 2.

Fig. 4 is a schematic structural diagram of a camera module according to some embodiments of the present application.

Fig. 5 is a partial structural schematic diagram of an optical lens according to a first embodiment of the present application.

Fig. 6 is a schematic axial aberration diagram of an optical lens according to the first embodiment of the present application.

Fig. 7 is a schematic view of vertical axis chromatic aberration of an optical lens according to the first embodiment of the present application.

Fig. 8 is a partial structural schematic diagram of an optical lens according to a second embodiment of the present application.

Fig. 9 is a schematic view of axial aberration of an optical lens according to a second embodiment of the present application.

Fig. 10 is a schematic view of vertical axis chromatic aberration of an optical lens according to a second embodiment of the present application.

Fig. 11 is a partial structural schematic diagram of an optical lens according to a third embodiment of the present application.

Fig. 12 is a schematic axial aberration diagram of an optical lens according to a third embodiment of the present application.

Fig. 13 is a schematic view of vertical axis chromatic aberration of an optical lens according to the third embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

For convenience of understanding, technical terms related to the present application are explained and described below.

Focal length (f), also known as focal length, is a measure of the concentration or divergence of light in an optical system, and refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when an infinite scene is imaged clearly through the lens or lens group at the focal plane. From a practical point of view it can be understood as the distance of the lens center to the imaging plane. For a fixed-focus lens, the position of the optical center is fixed and unchanged; for a zoom lens, a change in the optical center of the lens results in a change in the focal length of the lens.

The positive focal power means that the lens has positive focal length and has the effect of converging light.

Negative focal power, which means that the lens has a negative focal length and has the effect of diverging light.

Total Track Length (TTL) refers to the total length from the end of the optical lens away from the imaging surface to the imaging surface.

The abbe number, i.e. the dispersion coefficient, is the ratio of the refractive index differences of the optical material at different wavelengths, and represents the dispersion degree of the material.

The optical axis is a ray that passes perpendicularly through the center of the ideal lens. When light rays parallel to the optical axis are incident on the convex lens, the ideal convex lens is that all light rays converge at a point behind the lens, and the point where all light rays converge is the focal point.

The object side is defined by the lens, and the side where the object is located is the object side.

And the image side is the side where the image of the shot object is located by taking the lens as a boundary.

The object side surface, the surface of the lens near the object side is called the object side surface.

The surface of the lens near the image side is called the image side surface.

Axial chromatic aberration, also known as longitudinal chromatic aberration or positional chromatic aberration or axial chromatic aberration, is a bundle of light rays parallel to the optical axis, which converge at different positions in front and behind after passing through the lens. The reason is that the positions of the lens for imaging the light with various wavelengths are different, so that the focal planes of the images of the light with different colors cannot be superposed during final imaging, and the polychromatic light is dispersed to form dispersion.

Temperature coefficient of relative refractive index (. Beta.) _x ) Defined as (dn/dt) _rel The index of refraction of a material in a medium such as air is represented by a coefficient of change with temperature.

The application provides a terminal, which can be a mobile phone, a tablet, a computer, a video camera, a camera or other equipment with photographing or shooting functions. Referring to fig. 1, fig. 1 is a schematic structural diagram of a terminal 1000 according to an embodiment of the present application. In this embodiment, terminal 1000 is a mobile phone. In other embodiments, terminal 1000 can be a device with an imaging function in other forms, such as a tablet or a camera.

The terminal 1000 includes a camera module 100 and an image processor 200 communicatively coupled to the camera module 100. The camera module 100 is used for acquiring image data and inputting the image data into the image processor 200, so that the image processor 200 processes the image data. The communication connection between the camera module 100 and the image processor 200 may include data transmission through electrical connection such as wire connection, or may also be realized through other data transmission modes such as optical cable connection or wireless transmission.

The function of the image processor 200 is to optimize the digital image signal through a series of complex mathematical algorithm operations, and finally to transmit the processed signal to a display or store the processed signal in a memory. The image processor 200 may be an image processing chip or a Digital Signal Processing (DSP) chip.

In the embodiment shown in fig. 1, camera module 100 is disposed on the back surface of terminal 1000, and is a rear camera of terminal 1000. It is understood that in some embodiments, camera module 100 can also be disposed on a front face of terminal 1000 as a front-facing camera of terminal 1000. The front camera and the rear camera can be used for self-shooting and can also be used for shooting other objects by a photographer.

In some embodiments, there are a plurality of camera modules 100, and the number of the plurality of camera modules is two or more. The plurality of camera modules 100 can cooperate with each other, thereby achieving a better shooting effect. In the embodiment shown in fig. 2, there are two rear cameras of the terminal 1000, and the two camera modules 100 are both in communication connection with the image processor 200, so as to process the image data of the two camera modules 100 through the image processor 200, so as to obtain better shot pictures or images.

It should be understood that the installation position of the camera module 100 of the terminal 1000 in the embodiment shown in fig. 1 is only illustrative, and in some other embodiments, the camera module 100 can be installed in other positions on the mobile phone. For example, the camera module 100 can be installed in the middle of the upper part of the back of the mobile phone or in the upper right corner; alternatively, the camera module 100 may be disposed not on the main body of the mobile phone, but on a component that is movable or rotatable with respect to the mobile phone, for example, the component may be extended, retracted, or rotated from the main body of the mobile phone. The present application does not limit the installation position of the camera module 100.

Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a terminal according to another embodiment of the present application, and fig. 3 is a schematic imaging principle diagram of the terminal shown in fig. 2. In some embodiments, terminal 1000 can further include an analog-to-digital converter (also referred to as A/D converter) 300. The adc 300 is connected between the camera module 100 and the image processor 200. The analog-to-digital converter 300 is configured to convert an analog image signal generated by the camera module 100 into a digital image signal and transmit the digital image signal to the image processor 200, and then the image processor 200 processes the digital image signal, and finally displays an image or an image on a display screen or a display.

In some embodiments, the terminal 1000 further includes a memory 400, the memory 400 is in communication with the image processor 200, and the image processor 200 processes the digital image signal and then transmits the processed image to the memory 400, so that the image can be searched from the memory and displayed on the display screen at any time when the image needs to be viewed later. In some embodiments, the image processor 200 further compresses the processed image digital signal and stores the compressed image digital signal in the memory 400, so as to save the space of the memory 400. It should be noted that fig. 3 is only a schematic structural diagram of the embodiment of the present application, and the position structures of the camera module 100, the image processor 200, the analog-to-digital converter 300, the memory 400, and the like shown in the diagram are only schematic.

Referring to fig. 3, the camera module 100 includes an optical lens 10 and a photosensitive element 20. The light sensing element 20 is located on the image side of the optical lens 10. The image side of the optical lens 10 refers to a side of the optical lens 10 close to an image of a subject to be imaged. When the camera module 100 is in operation, a subject to be imaged passes through the optical lens 10 and then is imaged on the photosensitive element 20. Specifically, the working principle of the camera module 100 is as follows: the light L reflected by the scene to be imaged generates an optical image through the optical lens 10 and projects the optical image onto the surface of the photosensitive element 20, the photosensitive element 20 converts the optical image into an electrical signal, i.e., an analog image signal S1, and transmits the converted analog image signal S1 to the analog-to-digital converter 300, so as to convert the electrical signal into a digital image signal S2 through the analog-to-digital converter 300 and send the digital image signal S2 to the image processor 200. The ray arrows in fig. 3 are merely schematic and do not represent actual ray angles.

The photosensitive element 20 is a semiconductor chip, and includes several hundreds of thousands to several millions of photodiodes on the surface thereof, and generates electric charges when being irradiated by light, thereby completing the conversion of optical signals into electrical signals. Alternatively, the light sensing element 20 may be any device capable of converting an optical signal into an electrical signal. For example, the photosensitive element 20 may be a Charge Coupled Device (CCD) or a complementary metal-oxide semiconductor (CMOS).

The optical lens 10 affects the imaging quality and the imaging effect. The optical lens 10 includes a plurality of lenses arranged from the object side to the image side, and performs imaging mainly by using the refraction principle of the lenses. Specifically, light of an object to be imaged forms a clear image on a focal plane through the optical lens 10, and an image of a subject is recorded through the photosensitive element 20 located on the focal plane. The adjacent lenses can have air space between them, or can be arranged closely. The main functions of each lens are different, and the best imaging quality is obtained through the cooperation of different lenses.

In some embodiments, the optical lens 10 further includes a diaphragm, and the diaphragm may be disposed on the object side of the plurality of lenses, or between lenses close to the object side of the plurality of lenses. For example, the diaphragm may be located between a first lens and a second lens close to the object side, or between a second lens and a third lens close to the object side in the plurality of lenses. The diaphragm may be an aperture diaphragm for limiting the amount of light entering to change the brightness of the image.

In some embodiments, the optical lens 10 further includes an infrared filter 30, and the infrared filter 30 is located between the photosensitive element 20 and the lens of the optical lens 10. The light refracted by each lens of the optical lens 10 is irradiated onto the infrared filter 30, and is transmitted to the photosensitive element 20 through the infrared filter 30. The infrared filter 30 can filter out unnecessary light projected onto the photosensitive element 20, and prevent the photosensitive element 20 from generating false colors or moire, so as to improve the effective resolution and color reproducibility thereof.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a camera module 100 according to some embodiments of the present disclosure. In some embodiments, the optical lens 10 further includes a lens barrel 10a, the plurality of lenses of the optical lens 10 are fixed in the lens barrel 10a, and the plurality of lenses fixed in the lens barrel 10a are coaxially disposed. In the embodiment of the present application, the plurality of lenses are fixed in the lens barrel 10a, the distance between the lenses is fixed, and the optical lens 10 is a lens with a fixed focal length. In some other embodiments of the present application, the lenses of the optical lens 10 can move relatively within the lens barrel 10a to change the distance between the lenses, so as to change the focal length of the optical lens 10, and thus achieve focusing of the optical lens 10. The infrared filter 30 may be fixed to an end of the lens barrel 10a of the optical lens 10 facing the image side.

The camera module 100 further includes a fixing base (holder) 50, a circuit board 60, and the like.

The fixing base 50 includes an accommodating cavity, the optical lens 10 is accommodated in the accommodating cavity of the fixing base 50 and fixed to the cavity wall of the accommodating cavity, and the optical lens 10 is fixed relative to the fixing base 50 and cannot move relative to the fixing base 50. The circuit board 60 is fixed to a side of the fixing base 50 facing away from the optical lens 10. The wiring board 60 is used to transmit electrical signals. The circuit board 60 may be a Flexible Printed Circuit (FPC) or a Printed Circuit Board (PCB), wherein the FPC may be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid flexible board, a hybrid-structure flexible circuit board, or the like. Other components included in the camera module 100 are not described in detail herein. The infrared filter 30 may be fixed to the cavity wall of the fixing base 50 and located between the optical lens 10 and the circuit board 60; alternatively, the support may be supported and fixed above the circuit board 60.

The photosensitive element 20 is fixed to the circuit board 60 by bonding or mounting. The light receiving element 20 is located on the image side of the optical lens 10 and is disposed opposite to the optical lens 10, and an optical image generated by the optical lens 10 can be projected onto the light receiving element 20. In some embodiments, the analog-to-digital converter 300, the image processor 200, the memory 400, etc. are also integrated on the circuit board 60 by means of bonding or mounting, etc., so that the communication connection between the photosensitive element 20, the analog-to-digital converter 300, the image processor 200, the memory 400, etc. is realized through the circuit board 60.

In some embodiments, the lens barrel 10a and the fixed base 50 of the optical lens 10 can move relative to the fixed base 50 to change the distance between the optical lens 10 and the photosensitive element 20. When the focal length of the optical lens 10 changes, the lens barrel 10a moves relative to the fixed base 50, so as to adjust the distance between the optical lens 10 and the photosensitive element 20 accordingly, thereby ensuring the imaging quality of the camera module 100. For example, in some embodiments, the fixing base 50 includes a cavity wall of the receiving cavity provided with an internal thread, the outer wall of the lens barrel 10a is provided with an external thread, and the lens barrel 10a is in threaded connection with the fixing base 50. The lens barrel 10a is driven by the driver to rotate, so that the lens barrel 10a moves in the axial direction relative to the fixed base 50, and the lens of the optical lens 10 is close to or far away from the photosensitive element 20. It is understood that the lens barrel 10a may be connected to the fixed base 50 in other manners and may be moved relative to the fixed base 50. For example, the lens barrel 10a and the fixed base 50 are connected by a slide rail.

In some embodiments, the plurality of lenses of the optical lens 10 of the present application includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, which are coaxially disposed, and each of the lenses includes an object side surface facing the object side and an image side surface facing the image side. It is to be understood that the plurality of lenses of the present application are lenses having positive optical power or negative refractive power, and when a plane mirror is inserted between the plurality of lenses, the plane mirror does not function as a lens of the optical lens of the present application. For example, when a plane mirror is inserted between the fourth lens 14 and the fifth lens 15, the plane mirror cannot be calculated as the fifth lens according to the embodiment of the present application.

In the present application, each lens of the optical lens 10 may be made of plastic, glass, or other composite materials. In some embodiments, the first lens 11 or the second lens 12 is a glass lens, and the other lenses are glass lenses or plastic lenses. Because the relative refractive index temperature coefficient of glass lens is lower, the degree that the refractive index of glass lens changes along with the temperature is less promptly, consequently, the optical lens of this application compares the optical lens who adopts plastic lens entirely, and the temperature drift coefficient can reduce greatly. In general, the refractive index of the glass lens varies with temperature in accordance with the following relationship: dn/dT>0; the refractive index of the plastic lens changes with temperature, and the relation is as follows: the dn/dT is less than 0, and when the temperature changes, compensation can be generated between the glass lens and the plastic lens, so that the temperature drift of the optical lens is reduced. And, the refractive index n of the glass lens ₁ Satisfies the following conditions: n is more than or equal to 1.50 ₁ 1.90, and the selectable range of the refractive index is larger relative to the refractive index range (1.55-1.65) of the plastic lens, so that a thinner glass lens with better performance can be obtained more easily.

In some embodiments of the present disclosure, the first lens 11 and the second lens 12 of the optical lens 10 are made of glass, so as to obtain the first lens 11 and the second lens 12 which are thin and have strong aberration correction capability. Because the first lens 11 and the second lens 12 are made of glass, the temperature drift of the optical lens 10 can be reduced, and the temperature drifts of the other lenses can be compensated through the first lens 11 and the second lens 12, so that the temperature drift of the optical lens 10 is further reduced. In some embodiments of the present application, the temperature drift coefficient Δ f/Δ ℃ of the optical lens 10 is smaller, and satisfies the following relation: 2.2 μm/DEG C.ltoreq.f/Delta. DEG C.ltoreq.1.4 μm/DEG C. In addition, since the optical lens 10 is more important for adjusting the optical effect as the lens closer to the object side is subjected to the larger work of adjusting the optical path, in the present embodiment, the best image pickup effect can be obtained by using the lens made of glass as less as possible by forming the first lens 11 of glass.

Further, in the present application, the refractive indexes of the first lens 11 and the second lens 12 are different, that is, the first lens 11 and the second lens 12 are made of different kinds of glass materials. The first lens 11 and the second lens 12 are bonded to form a double-bonded lens, that is, the image side surface of the first lens 11 and the object side surface of the second lens 12 are bonded by an optical adhesive material. The double-cemented lens has a simple structure, and because the first lens 11 is cemented with the second lens 12, the light energy loss is small when the light is transmitted to the second lens 12 through the first lens 11. Moreover, by reasonably matching the refractive indexes and focal powers of the first lens 11 and the second lens 12, the spherical aberration, coma aberration, chromatic aberration and the like of the optical lens 10 can be corrected through the double cemented lenses, so as to obtain a better shooting effect. In some embodiments of the present application, the first lens 11 has a positive optical power and the second lens 12 has a negative optical power. Relative refractive index temperature coefficient beta of at least one of the double-cemented lens, the third lens 13, the fourth lens 14 and the fifth lens 15 _x Satisfy the requirement ofThe relation is as follows: -9X 10 ^-5 ≤β _x ≤9×10 ^-5 。

In the present application, the optical lens 10 is composed of a plurality of different lenses, and different combinations of lenses (for example, the order of the lenses arranged along the optical path, the lens material, the refractive index, the shape curvature, and the like) bring different optical performances. In some embodiments of the present application, the first lens 11 has positive optical power. The paraxial portions of the object-side surface and the image-side surface of the first lens 11 are convex. The second lens 12 has a negative power. The paraxial portions of the object-side surface and the image-side surface of the second lens element 12 are concave. Wherein convex or concave paraxial means convex or concave at an infinite axial position closer to the lens. I.e. the proximal axis refers to the position of the wireless proximal axis. The shape of the lens and the degree of the irregularity on the object-side surface and the image-side surface are merely illustrative, and the present embodiment is not limited thereto, and the present embodiment is not limited to the irregularity on the portion of the object-side surface and the image-side surface away from the optical axis. In some embodiments of the present application, the first lens 11 and the second lens 12 are bonded to form a double cemented lens having positive optical power. Because the object-side surface of the first lens 11 is a convex surface and the double-cemented lens has positive focal power, the ability of the optical lens 10 to focus external light can be improved through the double-cemented lens, so as to increase the external light incident quantity, and the total optical length TTL of the optical lens 10 can be reduced, so that the optical lens 10 can be more suitable for thin devices such as mobile terminals.

Specifically, in some embodiments of the present application, the total optical length of the optical lens 10 and the effective focal length f of the optical lens 10 satisfy the following relation: TTL/f is more than or equal to 0.75 and less than or equal to 1.0. That is, the optical lens 10 of the present embodiment can satisfy the required effective focal length f, and the total optical length TTL of the optical lens 10 can be small, so that when the optical lens 10 is applied to a terminal, the terminal can be thinned more.

In some embodiments, the focal length f of the doublet ₁ And the system focal length f of the optical lens satisfies the relation: f is not less than 0 ₁ The/f is less than or equal to 1.5. This relationship specifies the range of the ratio of the focal length of the doublet to the optical lens 10,the light-gathering capacity of the double-cemented lens is shown, and the coma aberration and the axial chromatic aberration of the system are favorably reduced. In some embodiments of the present application, by reasonably distributing the focal power of each lens, the vertical axis chromatic aberration of the optical lens 10 can be smaller than 3.6um, and the axial chromatic aberration is smaller than 12um.

In some embodiments of the present disclosure, the third lens 13 has positive focal power, which can further improve the light converging capability of the optical lens 10 and reduce coma aberration and axial chromatic aberration of the optical system. The fourth lens 14 has negative focal power, and can expand the light beam with the lens having negative focal power, thereby increasing the image height of the image. Further, the optical power can be adjusted to other lenses, so that the aberration and the like of the optical lens 10 can be eliminated to obtain a better optical effect.

Since the processing of glass lenses is more difficult than that of plastic lenses. Therefore, in some embodiments of the present disclosure, the object-side surface and the image-side surface of the first lens 11 and the second lens 12 are both spherical surfaces, so as to reduce the manufacturing difficulty of the first lens 11 and the second lens 12. The object-side surface and the image-side surface of the third lens 13, the fourth lens 14 and the fifth lens 15 are aspheric, so that the optical lens 10 with a better optical effect can be obtained by designing parameters of the object-side surface and the image-side surface of the third lens 13, the fourth lens 14 and the fifth lens 15.

In some embodiments of the present application, the aspheric surface of each lens satisfies the formula:

wherein z is the relative distance between a point on the aspheric surface and the optical axis as r and a tangent plane of the intersection point tangent to the aspheric surface on the optical axis, r is the perpendicular distance between the point on the aspheric surface curve and the optical axis, c is the aspheric surface vertex curvature, K is the conic constant, a _i Is the ith order aspheric coefficient, and rho is the normalized axial coordinate.

Through the relational expression, lenses with different aspheric surfaces are obtained, different optical effects can be achieved through different lenses, and good shooting effects are achieved through matching of different aspheric surface lenses.

According to the given relation and range in some embodiments of the present application, the combination of the lens configuration and the lens with a specific optical design can make the optical lens 10 satisfy the requirement of achieving a smaller temperature drift and obtaining a higher imaging performance. Some specific, but non-limiting examples of embodiments of the present application will be described in more detail below in conjunction with fig. 5-13.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 10 according to a first embodiment of the present disclosure. In this embodiment, the optical lens 10 includes five lenses, which are respectively a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, wherein the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are disposed in order from an object side to an image side, and each of the lenses is disposed coaxially. The image side surface of the first lens 11 and the object side surface of the second lens 12 are bonded to form a double cemented lens.

The first lens 11 has positive focal power, and the object-side surface thereof is a convex surface in the paraxial region and the image-side surface thereof is a convex surface in the paraxial region; the second lens element 12 with negative refractive power has a concave object-side surface and a concave image-side surface. The image side surface of the first lens 11 and the object side surface of the second lens 12 are spherical surfaces with the same curvature, so that the image side surface of the first lens 11 and the object side surface of the second lens 12 can be tightly attached. The third lens 13 has positive focal power, and its object-side surface is convex in the paraxial region and its image-side surface is concave in the paraxial region; the fourth lens element 14 with negative refractive power has a concave object-side surface and a concave image-side surface; the fifth lens element 15 has positive power, and has a concave object-side surface and a convex image-side surface.

In the present embodiment, the first lens 11 and the second lens 12 are made of glass, and the third lens 13, the fourth lens 14, and the fifth lens 15 are made of plastic. The object-side surface and the image-side surface of the first lens 11 and the second lens 12 are spherical, and the object-side surface and the image-side surface of the third lens 13, the fourth lens 14 and the fifth lens 15 are aspheric. In accordance with the relationships satisfied by the optical lens 10 of the present application, the design parameters of the optical lens 10 of the first embodiment of the present application are as shown in table 1 below.

Table 1 design parameters of optical lens of the first embodiment

Flour mark	Description of the invention	Surface type	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion
								S1	First lens	Standard noodle	4.061	1.050	Glass	1.589	61.163
S2		Standard noodle	-34.108	-
								S3	Second lens	Standard noodle	-34.108	0.500	Glass	1.717	29.510
S4		Standard noodle	8.096	0.819
								S5	Third lens	Aspherical surface	3.202	1.531	Plastic material	1.545	55.987
S6		Aspherical surface	5.731	0.825
								S7	Fourth lens	Aspherical surface	-24.681	0.500	Plastic material	1.545	55.987
S8		Aspherical surface	4.001	2.056
								S9	Fifth lens element	Aspherical surface	-7.080	2.030	Plastic material	1.545	55.987
S10		Aspherical surface	-6.906	0.300
								S11	Infrared filter	Plane surface	Infinite number of elements	0.210	-
S12		Plane surface	Unlimited in size	2.841

Wherein S1 denotes an object side surface of the first lens 11, S2 denotes an image side surface of the first lens 11, S3 denotes an object side surface of the second lens 12, S4 denotes an image side surface of the second lens 12, S5 denotes an object side surface of the third lens 13, S6 denotes an image side surface of the third lens 13, S7 denotes an object side surface of the fourth lens 14, S8 denotes an image side surface of the fourth lens 14, S9 denotes an object side surface of the fifth lens 15, S10 denotes an image side surface of the fifth lens 15, S11 denotes an object side surface of the optical filter 30, and S12 denotes an image side surface of the optical filter 30. It should be noted that, in the present application, the meanings of symbols such as S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, and S12 are the same, and are not described again in the following description.

Table 2 shows aspheric coefficients of the respective lenses (i.e., the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15) of the optical lens 10 according to the present embodiment.

Table 2 design parameters of each lens of the optical lens 10 of the first embodiment

Flour mark	K	A4	A6
				S1
	0	0	0
				S2	0	0	0
S3	0	0	0
				S4	0	0	0
S5	-3.61E-11	3.80E-04	-1.87E-05
				S6	5.76E-11	-5.17E-03	-1.89E-03
S7	3.33E-10	-3.97E-02	3.99E-03
				S8	-3.85E-10	-2.09E-02	8.32E-03
S9	2.80E-10	-7.18E-03	-1.89E-03
				S10	-8.89E-11	-5.81E-03	-4.40E-04

Where K is a conic constant, and symbols A4, A6, etc. represent polynomial coefficients. Each parameter in the table is represented by a scientific notation. For example, -3.61E-11 means-3.61X 10 ^-11 (ii) a 3.80E-04 means 3.80X 10 ^-4 。

By substituting the above parameters into the formula:

namely, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 and the fifth lens 15 can be designed.

In the present embodiment, it is preferred that,

it should be noted that, in the present application, the meanings of the symbols K, A, A6, etc. are the same, and are not described in detail again in the following.

The optical lens 10 of the present embodiment is obtained from the design parameters of the respective lenses. Table 3 shows basic parameters of the optical lens 10 of the present embodiment.

Table 3 basic parameters of the optical lens of the first embodiment

Wherein, TTL is the total optical length of the optical lens 10, imgH is the image height of the optical lens 10, f is the effective focal length of the optical lens 10, f1 is the focal length of the first lens 11, f2 is the focal length of the second lens 12, f3 is the focal length of the third lens 13, f4 is the focal length of the fourth lens 14, and f5 is the focal length of the fifth lens 15. It should be noted that, in the present application, the meanings of symbols such as TTL, imgH, f1, f2, f3, f4, and f5 are the same, and are not described again in the following.

In this embodiment, the total optical length TTL of the optical lens 10 and the effective focal length f of the optical lens 10 satisfy the condition: TTL/f is less than or equal to 0.88, so that a smaller TTL can be implemented when the effective focal length of the optical lens 10 is ensured, and the optical lens 10 of the present embodiment can be better applied to a thinned terminal.

In the embodiment, the first lens 11 and the second lens 12 are glass lenses, and the first lens 11 and the second lens 12 are bonded to form a double-cemented lens, so that the temperature drift of the optical lens 10 can be reduced. Specifically, in the present embodiment, when the temperature changes by Δ ℃, the variation of the focal length f is Δ f, and the temperature drift coefficient Δ f/Δ ℃ satisfies the condition: the temperature drift coefficient delta f/delta ℃ in the embodiment is smaller, so that the temperature drift of the optical lens 10 can be reduced, the focus drift of the optical lens 10 at different temperatures is smaller, and a better shooting effect can be obtained.

Further, in the present embodiment, the temperature drift coefficient of the optical lens 10 can be further reduced by using a low refractive index temperature coefficient material and appropriate distribution of refractive power. Specifically, in the present embodiment, the first lens 11 satisfies the following temperature coefficient of relative refractive index β 1: -9 x 10-5 ≤ β 1 ≤ 9 x 10-5, and the temperature coefficient β 2 of the relative refractive index of the second lens 12 satisfies: beta 2 is more than or equal to 9 multiplied by 10 < -5 > and less than or equal to 9 multiplied by 10 < -5 >, and the focal length f12 of the double-cemented lens and the effective focal length f of the optical lens 10 satisfy the relation: f12/f =1.06, i.e., f12/f satisfies the relation: f12/f is more than or equal to 0 and less than or equal to 1.5.

In the present embodiment, the abbe number (V1) of the first lens 11 is 61.163, and satisfies 15 ≤ V1 ≤ 100, and the abbe number (V2) of the second lens is 29.510, and satisfies 15 ≤ V2 ≤ 100. In the present embodiment, chromatic aberration of the optical lens 10 can be corrected by appropriate power distribution and selection of the dispersion coefficient. In this embodiment, the vertical axis chromatic aberration is less than 3.6um, and the axial chromatic aberration is less than 12um.

Referring to fig. 6 and 7, fig. 6 and 7 are schematic diagrams illustrating optical performance of the optical lens 10 according to the first embodiment. Fig. 6 shows axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the optical lens 10 of example one. The ordinate of fig. 6 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction, in millimeters. As can be seen from fig. 6, in the present embodiment, the axial aberration is controlled within a small range. Fig. 7 is a schematic diagram illustrating vertical axis chromatic aberration of the optical lens 10 according to the first embodiment. The ordinate of fig. 7 shows the actual image height, and the abscissa shows the chromatic aberration in the vertical axis direction in millimeters. As can be seen from fig. 7, in the present embodiment, the vertical axis chromatic aberration of the optical lens 10 is also controlled within a small range, i.e. the optical lens 10 has a good imaging effect.

Referring to fig. 8, fig. 8 is a schematic structural diagram of an optical lens 10 according to a second embodiment of the present application. In this embodiment, the optical lens 10 includes five lenses, which are respectively a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, wherein the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are disposed in order from an object side to an image side, and each of the lenses is disposed coaxially. The image side surface of the first lens 11 and the object side surface of the second lens 12 are bonded to form a double cemented lens.

The first lens 11 has positive focal power, and the object-side surface thereof is a convex surface in the paraxial region and the image-side surface thereof is a convex surface in the paraxial region; the second lens element 12 with negative refractive power has a concave object-side surface and a concave image-side surface. The image side surface of the first lens 11 and the object side surface of the second lens 12 are spherical surfaces with the same curvature, so that the image side surface of the first lens 11 and the object side surface of the second lens 12 can be tightly attached. The third lens 13 has positive focal power, and the object-side surface thereof is convex in the paraxial region and the image-side surface thereof is concave in the paraxial region; the fourth lens element 14 with negative refractive power has a concave object-side surface and a concave image-side surface; the fifth lens element 15 has positive power, with its object-side surface being concave in the paraxial region and its image-side surface being convex in the paraxial region.

In the present embodiment, the first lens 11 and the second lens 12 are made of glass, and the third lens 13, the fourth lens 14, and the fifth lens 15 are made of plastic. The object-side surface and the image-side surface of the first lens 11 and the second lens 12 are spherical, and the object-side surface and the image-side surface of the third lens 13, the fourth lens 14 and the fifth lens 15 are aspheric. In accordance with the relations satisfied above with respect to the optical lens 10 of the present application, the design parameters of the optical lens 10 of the second embodiment of the present application are as follows in table 4.

Table 4 design parameters of optical lens 10 of the second embodiment

Flour mark	Description of the invention	Surface type	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion
								S1	First lens	Standard noodle	3.982	1.059	Glass	1.589	61.163
S2		Standard noodle	-36.436	-
								S3	Second lens	Standard noodle	-36.436	0.500	Glass	1.717	29.510
S4		Standard noodle	8.032	0.100
								S5	Third lens	Aspherical surface	3.233	0.673	Plastic material	1.545	55.987
S6		Aspherical surface	4.574	2.106
								S7	Fourth lens	Aspherical surface	-13.234	0.500	Plastic material	1.545	55.987
S8		Aspherical surface	6.084	1.324
								S9	Fifth lens element	Aspherical surface	140.677	1.237	Plastic material	1.639	23.515
S10		Aspherical surface	-24.633	0.100
								S11	Infrared filter	Plane surface	Infinite number of elements	0.210	-
S12		Plane surface	Infinite number of elements	4.844

Table 5 shows aspheric coefficients of the respective lenses (i.e., the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15) of the optical lens 10 according to the present embodiment.

Table 5 design parameters of respective lenses of the optical lens 10 of the second embodiment

By substituting the above parameters into the formula:

In the present embodiment, it is preferred that,

the optical lens 10 of the present embodiment is obtained from the design parameters of the respective lenses. Table 6 shows basic parameters of the optical lens 10 of the present embodiment.

TABLE 6 basic parameters of optical lens of the second embodiment

Parameter (mm)	TTL	ImgH	f	f1	f2	f3	f4	f5
									Numerical value	12.7	2.8	14.50	11.86	-10.69	17.15	-7.56	32.64

In the present embodiment, the total optical length TTL of the optical lens 10 and the effective focal length f of the optical lens 10 satisfy the condition: TTL/f is not less than 0.87 and not more than 0.88, so that a smaller TTL can be implemented when the effective focal length of the optical lens 10 is ensured, and the optical lens 10 of the present embodiment can be better applied to a thinned terminal.

In the embodiment, the first lens 11 and the second lens 12 are glass lenses, and the first lens 11 and the second lens 12 are bonded to form a double-cemented lens, so that the temperature drift of the optical lens 10 can be reduced. Specifically, in the present embodiment, when the temperature changes by Δ ℃, the variation of the focal length f is Δ f, and the temperature drift coefficient Δ f/Δ ℃ satisfies the condition: the temperature drift coefficient Δ f/Δ ℃ in the present embodiment is smaller, which can reduce the temperature drift of the optical lens 10, so that the focus drift of the optical lens 10 is smaller at different temperatures, thereby obtaining better shooting effect.

Further, in the present embodiment, the temperature drift coefficient of the optical lens 10 can be further reduced by using a low refractive index temperature coefficient material and appropriate distribution of refractive power. Specifically, in the present embodiment, the first lens 11 satisfies the following temperature coefficient of relative refractive index β 1: -9 x 10-5 ≤ β 1 ≤ 9 x 10-5, and the temperature coefficient β 2 of the relative refractive index of the second lens 12 satisfies: beta 2 is more than or equal to 9 multiplied by 10 < -5 > and less than or equal to 9 multiplied by 10 < -5 >, and the focal length f12 of the double-cemented lens and the effective focal length f of the optical lens 10 satisfy the relation: f12/f =1.01, i.e. f12/f satisfies the relation: f12/f is more than or equal to 0 and less than or equal to 1.5.

In the present embodiment, the first lens 11 has an Abbe number V1 of 61.163 satisfying 15. Ltoreq. V1. Ltoreq.100, and the second lens has an Abbe number V2 of 29.510 satisfying 15. Ltoreq. V2. Ltoreq.100. In the present embodiment, chromatic aberration of the optical lens 10 can be corrected by appropriate power distribution and selection of the dispersion coefficient. In this embodiment, the vertical axis chromatic aberration is less than 3.6um, and the axial chromatic aberration is less than 12um.

Referring to fig. 9 and 10, fig. 9 and 10 are schematic diagrams illustrating optical performance of an optical lens 10 according to a second embodiment. Fig. 9 shows axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the optical lens 10 of example two. The ordinate of fig. 9 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 9, in the present embodiment, the axial aberration is controlled within a small range. Fig. 10 is a schematic diagram illustrating vertical axis chromatic aberration of the optical lens 10 according to the second embodiment. The ordinate of fig. 10 shows the actual image height, and the abscissa shows the chromatic aberration in the vertical axis direction in millimeters. As can be seen from fig. 10, in the present embodiment, the vertical axis chromatic aberration of the optical lens 10 is also controlled within a small range, i.e. the optical lens 10 has a good imaging effect.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an optical lens 10 according to a third embodiment of the present disclosure. In this embodiment, the optical lens 10 includes five lenses, which are respectively a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, wherein the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are disposed in order from an object side to an image side, and each of the lenses is disposed coaxially. The image side surface of the first lens 11 and the object side surface of the second lens 12 are bonded to form a double cemented lens.

The first lens 11 has positive focal power, and the object-side surface thereof is convex in the paraxial region and the image-side surface thereof is convex in the paraxial region; the second lens element 12 with negative refractive power has a concave object-side surface and a concave image-side surface. The image side surface of the first lens 11 and the object side surface of the second lens 12 are spherical surfaces with the same curvature, so that the image side surface of the first lens 11 and the object side surface of the second lens 12 can be tightly attached. The third lens 13 has positive focal power, and its object-side surface is convex in the paraxial region and its image-side surface is concave in the paraxial region; the fourth lens element 14 with negative refractive power has a concave object-side surface and a concave image-side surface; the fifth lens element 15 has positive power, with its object-side surface being concave in the paraxial region and its image-side surface being convex in the paraxial region.

In the present embodiment, the first lens 11 and the second lens 12 are made of glass, and the third lens 13, the fourth lens 14, and the fifth lens 15 are made of plastic. The object-side surface and the image-side surface of the first lens 11 and the second lens 12 are spherical, and the object-side surface and the image-side surface of the third lens 13, the fourth lens 14 and the fifth lens 15 are aspheric. In accordance with the relations satisfied above with respect to the optical lens 10 of the present application, the design parameters of the optical lens 10 of the third embodiment of the present application are as follows in table 7.

Table 7 design parameters of optical lens of the third embodiment

Flour mark	Description of the invention	Surface type	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion
								S1	First lens	Standard noodle	4.04	1.05	Glass	1.589	61.163
S2		Standard noodle	-33.19	0
								S3	Second lens	Standard noodle	-33.19	0.50	Glass	1.717	29.510
S4		Standard noodle	8.07	0.82
								S5	Third lens	Aspherical surface	3.22	1.53	Plastic material	1.639	23.515
S6		Aspherical surface	5.63	0.83
								S7	Fourth lens	Aspherical surface	-25.94	0.50	Plastic material	1.639	23.515
S8		Aspherical surface	4.11	2.06
								S9	Fifth lens element	Aspherical surface	-7.08	2.03	Plastic material	1.545	55.987
S10		Aspherical surface	-6.91	0.30
								S12	Infrared filter	Plane surface	Infinite number of elements	0.21	-

Table 8 shows aspheric coefficients of the respective lenses (i.e., the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15) of the optical lens 10 according to the present embodiment.

Table 8 design parameters of each lens of the optical lens 10 according to the third embodiment

By substituting the above parameters into the formula:

In the present embodiment, it is preferred that,

the optical lens 10 of the present embodiment is obtained from the design parameters of the respective lenses. Table 9 shows basic parameters of the optical lens 10 according to the present embodiment.

TABLE 9 basic parameters of optical lens in the third embodiment

Parameter (mm)	TTL	ImgH	f	f1	f2	f3	f4	f5
									Numerical value	12.7	2.8	14.43	12.08	-10.70	11.23	-6.45	100.42

In the present embodiment, the total optical length TTL of the optical lens 10 and the effective focal length f of the optical lens 10 satisfy the condition: TTL/f is greater than or equal to 0.87 and less than or equal to 0.88, so that a smaller TTL can be realized under the condition that the effective focal length of the optical lens 10 can be ensured, and the optical lens 10 of the present embodiment can be better applied to a thinned terminal.

In the embodiment, the first lens 11 and the second lens 12 are glass lenses, and the first lens 11 and the second lens 12 are bonded to form a double-cemented lens, so that the temperature drift of the optical lens 10 can be reduced. Specifically, in the present embodiment, when the temperature changes Δ ℃, the variation of the focal length f is Δ f, and the temperature drift coefficient Δ f/Δ ℃ satisfies the condition: the temperature drift coefficient delta f/delta ℃ in the embodiment is smaller, so that the temperature drift of the optical lens 10 can be reduced, the focus drift of the optical lens 10 at different temperatures is smaller, and a better shooting effect can be obtained.

Further, in the present embodiment, the temperature drift coefficient of the optical lens 10 can be further reduced by using a low refractive index temperature coefficient material and appropriate distribution of refractive power. Specifically, in the present embodiment, the first lens 11 satisfies the following temperature coefficient of relative refractive index β 1: -9 x 10-5 ≤ β 1 ≤ 9 x 10-5, and the temperature coefficient β 2 of the relative refractive index of the second lens 12 satisfies: beta 2 is more than or equal to 9 multiplied by 10 < -5 > and less than or equal to 9 multiplied by 10 < -5 >, and the focal length f12 of the double-cemented lens and the effective focal length f of the optical lens 10 satisfy the relation: f12/f =1.05, i.e. f12/f satisfies the relation: f12/f is more than or equal to 0 and less than or equal to 1.5.

Referring to fig. 12 and 13, fig. 12 and 13 are schematic diagrams illustrating optical performance of an optical lens 10 according to a third embodiment. Fig. 12 shows axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the optical lens 10 of example three. The ordinate of fig. 12 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 12, in the present embodiment, the axial aberration is controlled within a small range. Fig. 13 is a schematic diagram showing vertical axis chromatic aberration of the optical lens 10 according to the third embodiment. The ordinate of fig. 13 shows the actual image height, and the abscissa shows the chromatic aberration in the vertical axis direction in millimeters. As can be seen from fig. 13, in the present embodiment, the vertical axis chromatic aberration of the optical lens 10 is also controlled within a small range, i.e. the optical lens 10 has a good imaging effect.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical lens is characterized by comprising a plurality of lenses, wherein the lenses comprise a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged from an object side to an image side, the first lens and the second lens are glued to form a double-glued lens, the lenses are made of glass or plastic, and at least one of the first lens and the second lens is made of glass;

the first lens has a positive optical power, the second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a negative optical power, and the fifth lens has a positive optical power; the double cemented lens has positive focal power;

the optical lens satisfies the following relation:

0.75≤TTL/f≤1.0；

2. An optical lens according to claim 1, characterized in that the first and second optics have different dispersion coefficients.

3. An optical lens according to claim 1, characterized in that the object-side surface of the first lens is convex.

4. The optical lens of claim 1, wherein the image side surfaces and the object side surfaces of the first lens element and the second lens element are spherical surfaces, and the object side surfaces and the image side surfaces of the third lens element, the fourth lens element and the fifth lens element are aspheric surfaces.

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

-2.2μm/℃≤△f/△℃≤1.4μm/℃；

6. An optical lens according to claim 1, characterized in that the temperature coefficient of relative refractive index β of at least one of the cemented doublet, the third, the fourth and the fifth lens is _x The following relation is satisfied:

-9×10 ^-5 ≤β _x ≤9×10 ^-5 。

7. an optical lens according to claim 1, characterized in that the focal length f of the cemented doublet ₁ The system focal length f of the optical lens satisfies the following relation:

0≤f ₁ /f≤1.5。

8. an optical lens according to claim 1, further comprising a stop, the stop being located at an object side or an image side of the first lens.

9. A camera module comprising a photosensitive element and the optical lens of any one of claims 1 to 8, wherein the photosensitive element is located at an image side of the optical lens, and light passes through the optical lens and then is projected onto the photosensitive element.

10. A terminal comprising an image processor and the camera module of claim 9, the image processor communicatively coupled to the camera module, the camera module configured to obtain image data and input the image data to the image processor, the image processor configured to process the image data output therefrom.