WO2021051981A1 - Optical camera lens, camera module, and electronic device - Google Patents

Abstract

The present application provides an optical camera lens, from an object side to an image side, sequentially comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The optical camera lens satisfies the following relational expressions: 1.8≤F≤1.9; 2.0≤TTL/EPD≤2.1; and 1.0≤TTL/ImgH≤1.25, wherein F is the aperture of the optical camera lens, EPD is the entrance pupil diameter of the optical camera lens, TTL is the total optical length of the optical camera lens, and the ImgH is the maximum image height of the optical camera lens. The present application provides the optical camera lens, a camera module, and an electronic device, and the objective is to reduce an occupied space of the optical camera lens while ensuring the use performance of the optical camera lens.

Description

Camera optical lens, camera module and electronic equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on September 19, 2019, with the application number 201910888034.1 and the application name "Camera Optical Lens, Camera Module and Electronic Equipment", the entire content of which is incorporated by reference in In this application.

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on December 30, 2019, the application number is 201911399722.8, and the application name is "camera optical lens, camera module and electronic equipment", the entire content of which is incorporated by reference in In this application.

Technical field

The embodiments of the present application relate to the field of optical lenses, and more specifically, to a camera optical lens, a camera module, and an electronic device.

Background technique

With the development of electronic equipment technology and the diversified needs of consumers, the camera function has become an important feature of electronic equipment and the main indicator for evaluating the performance of electronic equipment. In addition, electronic equipment has a trend toward thin and light appearance. Therefore, there is an increasing demand for miniaturized camera lenses with good image quality in the market.

In order to obtain better imaging quality, traditional imaging optical lenses mostly adopt a four-element or five-element lens structure. As the pixels of the photosensitive element continue to shrink, six-element and seven-element lens structures have begun to appear, and the overall thickness of the imaging optical lens is also increasing, which is not conducive to the realization of the miniaturization of the imaging optical lens. Therefore, it is necessary to design an imaging optical lens that can not only achieve high imaging performance, but also has the characteristics of a small footprint and a compact structure.

Summary of the invention

The present application provides a camera optical lens, a camera head module, and an electronic device, with the purpose of reducing the occupied space of the camera optical lens under the premise of ensuring the use performance of the camera optical lens.

In a first aspect, an imaging optical lens is provided, which includes in order from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; The photographic optical lens satisfies the following relational expression: 1.8≤F≤1.9; and, 2.0≤TTL/EPD≤2.1; and, 1.0≤TTL/ImgH≤1.25; where F is the aperture of the photographic optical lens, and EPD is The entrance pupil aperture of the imaging optical lens, TTL is the total optical length of the imaging optical lens, and ImgH is the maximum image height of the imaging optical lens.

When the aperture, total optical length, entrance pupil aperture, total optical length, and maximum image height of the imaging optical lens in the embodiments of the present application satisfy the above relationship, the imaging optical lens can achieve high imaging performance while meeting the requirement of small optical total length.

Specifically, the above-mentioned relational expression specifies the range of the ratio of the effective focal length of the camera optical lens to the total optical length (ie, the aperture), which facilitates equal scaling when the optical system architecture is the same. In addition, when the entrance pupil aperture is fixed, the effective focal length EFL of the imaging optical lens 300 is less than twice the EPD, which is conducive to the realization of a large aperture design of the optical system.

The above relational expression specifies the range of the ratio of the total optical length of the imaging optical lens to the entrance pupil aperture. In the case of a certain entrance pupil aperture, the total optical length can be shortened, the overall thickness of the imaging optical lens can be reduced, and the space occupied by the imaging optical lens can be reduced.

The above relational expression specifies the range of the ratio of the total optical length of the imaging optical lens to the maximum image height. When the size of the image sensor is fixed, the total optical length can be shortened, the overall thickness of the camera optical lens can be reduced, and the space occupied by the camera optical lens can be reduced.

Optionally, the camera optical lens satisfies: 1.18≤TTL/ImgH≤1.21.

With reference to the first aspect, in some implementations of the first aspect, the imaging optical lens satisfies: 0.85≤LT/TTL≤0.90, where LT is the distance from the object side of the first lens to the seventh lens The farthest distance of the image side on the optical axis.

The above relational expression specifies the range of the ratio of the farthest distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens to the total optical length. When the overall thickness of the camera optical lens is constant, it is necessary to reserve a movable space for the camera optical lens to increase the diversity of the positional relationship between different lenses, so that the camera optical lens can be widened when the space occupied by the camera optical lens is constant. The working focal length range of the camera optical lens.

Optionally, the camera optical lens satisfies: 0.87≤LT/TTL≤0.88.

In the embodiments of this application, the lens is used as the boundary, the side where the object is located is the object side, and the surface of the lens facing the object side can be called the object side; with the lens as the boundary, the side where the image of the object is located is the image side The surface of the lens facing the image side can be called the image side.

It should also be noted that the positive or negative of the radius of curvature means that the optical surface is convex to the object side or convex to the image side, and when the optical surface (including the object side or the image side) is convex to the object side, the radius of curvature of the optical surface is a positive value; When the surface (including the object side surface or the image side surface) is convex toward the image side, it is equivalent to the optical surface being concave on the object side surface, and the radius of curvature of the optical surface is a negative value.

With reference to the first aspect, in some implementations of the first aspect, the first lens satisfies: 0.7≤|EFL/Φ1|≤0.80, where Φ1 is the optical power of the first lens, and EFL is the The effective focal length of the camera optical lens.

Optionally, the first lens satisfies: 0.76≤|EFL/Φ1|≤0.79.

With reference to the first aspect, in some implementations of the first aspect, the second lens satisfies: 5.0≤(R21+R22)/(R21-R22)≤6.5, where R21 is the object of the second lens The curvature radius of the side surface, R22 is the curvature radius of the image side surface of the second lens.

The above-mentioned relational expression specifies the range of the ratio of the radius of curvature of the object side surface of the second lens to the radius of curvature of the image side surface, which is beneficial to reduce the tolerance sensitivity of the system.

Optionally, the second lens satisfies: 5.5≤(R21+R22)/(R21-R22)≤6.0.

With reference to the first aspect, in some implementations of the first aspect, the image side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens includes at least three inflection points.

The object side surface of the third lens is convex near the optical axis, which is beneficial to balance the comprehensive aberration of the imaging optical lens.

The object side surface of the third lens and/or the image side surface of the third lens includes at least three inflection points, which facilitates the movement of the principal point of the imaging optical lens toward the object space, effectively shortening the effective focal length and the overall thickness of the imaging optical lens.

With reference to the first aspect, in some implementations of the first aspect, the fifth lens satisfies: 0.5≤|EFL/R51|+|EFL/R52|≤2.0, where EFL is the effective of the imaging optical lens Focal length, R51 is the radius of curvature of the object side surface of the fifth lens, and R52 is the radius of curvature of the image side surface of the fifth lens.

The above-mentioned relational expression specifies the range of the ratio of the radius of curvature of the object side surface of the fifth lens to the radius of curvature of the image side surface, which facilitates equal scaling when the optical system architecture is the same.

Optionally, the fifth lens satisfies: 0.8≤|EFL/R51|+|EFL/R52|≤1.3.

With reference to the first aspect, in some implementations of the first aspect, the sixth lens satisfies: 0.40≤|EFL/Φ6|≤0.60, where EFL is the effective focal length of the imaging optical lens, and Φ6 is the The power of the sixth lens.

Optionally, the sixth lens satisfies: 0.44≤|EFL/Φ6|≤0.52.

With reference to the first aspect, in some implementations of the first aspect, the sixth lens satisfies: 1.5≤|EFL/R61|+|EFL/R62|≤2.3, where EFL is the effective of the imaging optical lens Focal length, R61 is the radius of curvature of the object side surface of the sixth lens, and R62 is the radius of curvature of the image side surface of the sixth lens.

The above-mentioned relational expression stipulates the range of the ratio of the radius of curvature of the object side surface of the sixth lens to the radius of curvature of the image side surface, which facilitates equal scaling when the optical system architecture is the same.

Optionally, the sixth lens satisfies: 1.85≤|EFL/R61|+|EFL/R62|≤2.05.

With reference to the first aspect, in some implementations of the first aspect, the object side of the seventh lens is concave at the near optical axis, and the object side of the seventh lens includes at least three inflection points, and/ Or, the image side surface of the seventh lens is concave at the near optical axis, and the image side surface of the seventh lens includes at least three inflection points.

The object side surface of the seventh lens and/or the image side surface of the seventh lens includes at least three inflection points, which facilitates the movement of the principal point of the imaging optical lens toward the object space, effectively shortening the effective focal length and the overall thickness of the imaging optical lens.

With reference to the first aspect, in some implementation manners of the first aspect, the imaging optical lens satisfies: ² ≦(TTL) 2 /(EPD×ImgH)≦2.7.

Through proper combination of parameters, high-performance images can be obtained on a large-size image sensor, and the imaging optical lens has the characteristics of a large aperture and a compact structure.

Optionally, the camera optical lens satisfies: 2.4≤(TTL) ² /(EPD×ImgH)≤2.5.

With reference to the first aspect, in some implementations of the first aspect, the imaging optical lens satisfies: 1.65≤Nmax≤1.70, and 1.50≤Nmin≤1.58; where Nmax is the maximum refractive index of the imaging optical lens, Nmin is the minimum refractive index of the imaging optical lens.

The maximum refractive index of the imaging optical lens refers to the refractive index of the lens with the largest refractive index in the imaging optical lens; the minimum refractive index of the imaging optical lens refers to the refractive index of the lens with the smallest refractive index in the imaging optical lens.

By reasonably matching the refractive indices of different lenses, the overall aberration of the lens group can be improved, which is conducive to the miniaturization of the lens group.

With reference to the first aspect, in some implementations of the first aspect, the imaging optical lens satisfies: 15≤Vmin≤20, and 55≤Vmax≤60, where Vmax is the maximum dispersion coefficient of the imaging optical lens, Vmin is the minimum dispersion coefficient of the imaging optical lens.

The maximum dispersion coefficient of the imaging optical lens refers to the dispersion coefficient of the lens with the largest dispersion coefficient in the imaging optical lens; the minimum dispersion coefficient of the imaging optical lens refers to the dispersion coefficient of the lens with the smallest dispersion coefficient in the imaging optical lens. By reasonably matching the dispersion coefficients of different lenses, the overall aberration of the lens group can be improved, which is conducive to the miniaturization of the lens group.

With reference to the first aspect, in some implementations of the first aspect, the imaging optical lens satisfies: 3.5>CT6/CT2>2.0, and 4.0>CT6/CT4>2.0, and 2.5>CT6/CT5>2.0 , And, 2.0>CT6/CT1>1.2, and, 2.0>CT6/CT3>1.2, and, 3.0>CT6/CT7>1.2; where CT1 is the thickness of the first lens on the optical axis, and CT2 is the second lens The thickness on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis. The thickness on the axis, CT7 is the thickness of the seventh lens on the optical axis.

Through the reasonable configuration of different lens thicknesses, the best balance between the miniaturization of the lens group and the manufacturability of the lens can be obtained.

Optionally, the imaging optical lens satisfies: 2.9>CT6/CT2>2.7, and 3.2>CT6/CT4>2.5, and 2.4>CT6/CT5>2.2, and 1.6>CT6/CT1>1.4, and , 1.6>CT6/CT3>1.4, and, 2.2>CT6/CT7>1.5.

With reference to the first aspect, in some implementations of the first aspect, the imaging optical lens satisfies: 1.0<LD11/LD31<1.3, where LD11 is the maximum optical effective diameter of the object side of the first lens, and LD31 Is the maximum optical effective diameter of the object side of the third lens.

By constraining the maximum optical effective diameters of the first lens and the third lens, the front port diameter of the lens group can be reduced, thereby reducing the opening at the front end.

In a second aspect, a camera module is provided, including a motor and the camera optical lens in the first aspect or any one of the possible implementations of the first aspect, the motor is used to drive the camera optical lens for focusing and / Or optical image stabilization.

In a third aspect, an electronic device is provided, including a processor and the camera module in the second aspect, the camera module is used to obtain image data and input the image data into the processor so that The processor processes the image data.

Description of the drawings

Figure 1 is a schematic diagram of an electronic device.

Fig. 2 is an exploded view of the camera module of the embodiment of the present application.

Fig. 3 is a schematic structural diagram of an imaging optical lens according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a lens of an embodiment of the present application.

FIG. 5 is a schematic diagram of axial chromatic aberration of an imaging optical lens according to an embodiment of the present application.

FIG. 6 is a schematic diagram of vertical axis chromatic aberration of an imaging optical lens according to an embodiment of the present application.

FIG. 7 is a schematic diagram of optical distortion of an imaging optical lens according to an embodiment of the present application.

FIG. 8 is a schematic diagram of astigmatism of an imaging optical lens according to an embodiment of the present application.

FIG. 9 is a schematic structural diagram of an imaging optical lens according to an embodiment of the present application.

FIG. 10 is a schematic diagram of axial chromatic aberration of an imaging optical lens according to an embodiment of the present application.

FIG. 11 is a schematic diagram of vertical axis chromatic aberration of an imaging optical lens according to an embodiment of the present application.

FIG. 12 is a schematic diagram of optical distortion of an imaging optical lens according to an embodiment of the present application.

FIG. 13 is a schematic diagram of astigmatism of an imaging optical lens according to an embodiment of the present application.

FIG. 14 is a schematic structural diagram of an imaging optical lens according to an embodiment of the present application.

FIG. 15 is a schematic diagram of axial chromatic aberration of an imaging optical lens according to an embodiment of the present application.

FIG. 16 is a schematic diagram of vertical axis chromatic aberration of an imaging optical lens according to an embodiment of the present application.

FIG. 17 is a schematic diagram of optical distortion of an imaging optical lens according to an embodiment of the present application.

FIG. 18 is a schematic diagram of astigmatism of an imaging optical lens according to an embodiment of the present application.

detailed description

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

To facilitate understanding, the technical terms involved in this application will be explained and described below.

Focal length, also known as focal length, is a measure of the concentration or divergence of light in an optical system. It refers to the lens or lens group when a scene at infinity is formed into a clear image at the focal plane through a lens or lens group. The vertical distance from the optical center to the focal plane. From a practical point of view, it can be understood as the distance from the center of the lens to the film plane. For a fixed focus lens, the position of its optical center is fixed; for a zoom lens, the change of the optical center of the lens brings about a change in the focal length of the lens.

The effective focal length (EFL) is the distance from the center of the lens to the focal point.

Aperture is a device used to control the amount of light passing through the lens and entering the photosensitive surface of the body. It is usually inside the lens. Express the aperture size with F/number.

The aperture F value is the relative value (the reciprocal of the relative aperture) derived from the focal length of the lens/the lens diameter. The smaller the aperture F value, the more light will enter in the same unit time. The larger the aperture F value, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.

The relative aperture is equal to the focal length of the lens divided by the diameter of the entrance pupil.

Positive refractive power, also called positive refractive power, means that the lens has a positive focal length and has the effect of converging light.

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

The total track length (TTL) refers to the total length from the head of the lens barrel to the imaging surface, and is the main factor that forms the height of the camera.

Focal ratio F#, the focal length divided by the aperture size, this value can know the amount of light entering the optical system.

Dispersion coefficient Abbe number, also known as Abbe number, is the difference ratio of the refractive index of optical materials at different wavelengths, and represents the degree of dispersion of the material.

Field of view (FOV), in optical instruments, the lens of the optical instrument is the vertex, and the angle formed by the two edges of the maximum range where the object image of the measured target can pass through the lens is called the field of view angle. The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view and the smaller the optical magnification.

The optical axis is a line of light passing through the center of an ideal lens perpendicularly. When the light parallel to the optical axis enters the convex lens, the ideal convex lens should be a point where all the light rays converge behind the lens. This point where all the light rays converge is the focal point.

The object space is bounded by the lens, and the space where the object is located is the object space.

The image space is bounded by the lens. The space where the light emitted by the subject passes through the lens and the image formed behind the lens is called the image space.

Taking the lens as the boundary, the side where the object is located is the object side, and the surface of the lens close to the object side can be called the object side; taking the lens as the boundary, the side where the image of the object is located is the image side, and the lens is close to the image side The surface can be called the image side.

Focal power, also called diopter, is equal to the difference between the image-side beam convergence and the object-side beam convergence, and it represents the ability of the optical system to deflect light. The refractive power of the convex lens is positive, and the refractive power of the concave lens is negative.

Aperture refers to the edge, frame or specially set apertured barrier of the optical element in the optical tool assembly used to limit the size of the imaging beam or the imaging space unit.

The diaphragm is the diaphragm that limits the maximum inclination angle of the edge rays in the on-axis point imaging beam, that is, the diaphragm with the smallest incident aperture angle.

The entrance pupil is the common entrance of the light beams emitted from all points on the object surface. It can also be called the entrance pupil. The entrance pupil diameter is the diameter of the entrance pupil. The diameter of the entrance pupil can represent the amount of light that the eye can see from the eyepiece.

The exit pupil is a common exit from the last light hole after the light beam emitted from each point on the object surface passes through the entire optical system.

Chromatic aberration, also known as chromatic aberration, is a serious defect of lens imaging. Chromatic aberration can be understood as the aberration caused by the refractive index of various colors of light. The wavelength range of visible light is about 400 to 700 nanometers. Different wavelengths of light have different colors, and their refractive index when passing through the lens is also different. Therefore, a point in the object space may form a color spot in the image space. Color aberration generally has positional chromatic aberration (also called Axial chromatic aberration), magnified chromatic aberration (also called vertical chromatic aberration). Positional chromatic aberration means that when observing objects in the object space at any position, color spots or halos will be formed in the image space, making the image blurry. Clear. And magnified chromatic aberration refers to the existence of color edges in the image.

Axial chromatic aberration, also known as longitudinal chromatic aberration or positional chromatic aberration or axial aberration, a beam of light parallel to the optical axis will converge at different positions before and after passing through the lens. This aberration is called positional chromatic aberration or axial chromatic aberration. . This is due to the different imaging positions of the lens for the light of each wavelength, so that the focal planes of the images of different colors of light cannot be overlapped in the final imaging, and the polychromatic light is scattered to form dispersion.

Lateral chromatic aberration is also called chromatic aberration of magnification and vertical axis chromatic aberration. The difference in the magnification of different colors of light by the optical system is called chromatic aberration of magnification. The wavelength causes the change of the magnification of the optical system, and the size of the image changes accordingly.

Distortion (distortion), also known as distortion, is the degree of distortion of the image formed by the optical system on the object relative to the object itself. The distortion is due to the influence of the spherical aberration of the diaphragm. The height of the intersection of the chief rays of the principal rays of different fields of view with the Gaussian image plane after passing through the optical system is not equal to the ideal image height, and the difference between the two is the distortion. Therefore, the distortion only changes the imaging position of the off-axis object point on the ideal surface, causing distortion of the shape of the image, but does not affect the sharpness of the image.

Optical distortion (optical distortion) refers to the degree of distortion calculated in optical theory.

The meridian plane refers to the plane formed by the chief ray from an object point outside the main axis of the optical system and the main axis of the optical system. The light rays located in the meridian plane are collectively referred to as the meridian beam. The point formed by the meridian beam is called the meridian image point. The image plane where the meridian image point is located is called the meridian image plane. The sagittal plane refers to the plane perpendicular to the meridian plane through the chief ray emitted by the external object point located on the main axis of the optical system. The rays located in the sagittal plane are collectively referred to as sagittal beams. The point formed by the sagittal beam is called the sagittal image point. The image plane where the sagittal image point is located is called the sagittal image plane. Because the light-emitting object point is not on the optical axis of the optical system, and the light beam emitted by the light-emitting object point has an inclination angle with the optical axis. After the beam is refracted by the lens, the meridian beam and the sagittal beam cannot converge at the same point. Therefore, the phenomenon that causes unclear imaging is called astigmatism.

Diffraction limit (diffraction limit) means that an ideal object point is imaged by an optical system. Due to the limitation of diffraction, it is impossible to obtain an ideal image point, but a Fraunhofer diffraction image. Since the aperture of a general optical system is circular, the Fraunhofer diffraction image is the so-called Airy disk. In this way, the image of each object point is a diffuse spot, and it is difficult to distinguish two diffuse spots close together, which limits the resolution of the system. The larger the spot, the lower the resolution.

The maximum optical effective diameter refers to the maximum diameter of the lens used to pass light. The parameters of the lens may include the maximum optical effective diameter on the object side and the maximum optical effective diameter on the image side.

Figure 1 shows a schematic diagram of an electronic device. As shown in FIG. 1, the electronic device 100 is equipped with a camera module 110 and/or a camera module 120, and the camera module 110 or 120 includes the camera optical lens 300 (not shown in the figure) of the embodiment of the present application.

The electronic device 100 may be an electronic device with a camera or camera function, such as a mobile phone, a smart phone, a tablet computer, a laptop computer, a video camera, a video recorder, a camera, or other devices with a camera or camera function. To facilitate understanding, the embodiment of the present application is described by taking the electronic device 100 as a mobile phone as an example.

When the electronic device 100 is a mobile phone, a camera compact module (CCM) can be provided on both the front and back of the electronic device 100, or only a camera module can be provided on the front or back. As shown in Fig. 1, the left picture is the front of the mobile phone, and the camera module 110 is installed on the upper part of the mobile phone, which can be used for self-portraits, and can also be used for the photographer to take pictures of other objects. The right picture in FIG. 1 is the back of the mobile phone, and the camera module 120 is installed in the upper left part of the mobile phone, which can be used to take pictures of surrounding scenes or Selfie.

It should be understood that the installation positions of the camera module 110 and the camera module 120 are only illustrative. In some other embodiments, the camera modules 110 and 120 may also be installed in other positions on the mobile phone, such as the camera module 110. It can be installed on the left side of the handset or the upper middle position of the mobile phone. The camera module 120 can be installed on the upper middle or upper right corner of the back of the mobile phone. The camera module 110 or 120 can also be installed on the main body of the mobile phone instead of the mobile phone. On a movable or rotatable component, for example, the component can be extended, retracted or rotated from the main body of the mobile phone, etc. The installation position of the camera module is not limited in this application.

It should also be understood that the number of the camera module 110 and the camera module 120 to be installed is not limited to one, but may also be two or more. For example, the electronic device 100 may have two camera modules 120 installed on the back. The embodiment of the present application does not make any limitation on the number of installed camera modules.

The camera modules 110 and 120 can be used to shoot external videos or photos, and can be used to shoot scenes at different distances. For example, the camera module can be used to shoot distant scenes, can be used to shoot near scenes, and can also be used to shoot micro-views. Away from the scene. The camera modules 110 and 120 can also be used for selfies. The camera module 120 on the back of the mobile phone shown in the figure can also be used for front cameras, etc., which is not limited in the embodiment of the present application.

It should be understood that the electronic device 100 shown in FIG. 1 may also be provided with other components, such as earpieces, buttons, sensors, etc. The embodiment of the present application only takes an electronic device with a camera module as an example, but the electronic device 100 The components installed on it are not limited to this.

FIG. 2 shows an exploded view of the camera module 200. The camera module 200 may be the camera module 110 or the camera module 120 shown in FIG. 1. The structure of the camera module will be described below in conjunction with FIG. 2.

The camera module 200 may include an optical lens (lens) 210, an image sensor (sensor) 220, an analog-to-digital converter (also referred to as an A/D converter) 230, an image processor 240, a memory 250, and so on.

Taking the electronic device 100 as a mobile phone as an example, the working principle of the camera module 200 may be that the light L reflected by the subject is projected onto the surface of the image sensor 220 through an optical lens (lens) 210 to generate an optical image. The optical image can be converted into an electrical signal, that is, an analog image signal S1, and the analog image signal S1 can be converted into a digital image signal S2 through an analog-to-digital converter A/D230. The digital image signal S2 may be converted into a compressed image signal S3 through processing of the image processor 240 (for example, a digital signal processing chip (digital signal processing, DSP)). The compressed image signal S3 may be stored in the memory 250 and finally displayed on the display screen.

The optical lens 210 is a key component that affects the imaging quality and imaging effect. The optical crystal 210 mainly uses the principle of lens refraction to image, that is, the light emitted from the scene can pass through the lens and be focused on the focal plane, thereby forming a clear image of the scene. After that, the image on the focal plane is recorded by a photosensitive material or a photoreceptor, and then the appearance of the scene can be recorded. The lens may be a whole composed of a plurality of lenses (lenses) combined. The material of the lens can be resin, plastic, or glass. Lenses include spherical lenses and aspheric lenses. The lens can be a fixed focal length lens, or a zoom lens, it can also be a standard lens, a short-focus lens or a long-focus lens.

The image sensor 220 is a semiconductor chip with hundreds of thousands to millions of photodiodes on its surface, and charges are generated when the diodes are irradiated by light. The analog-to-digital converter chip can convert electrical signals into digital signals. The image sensor 220 may be a charge coupled device (CCD) or a complementary metal-oxide conductor device (CMOS). The charge coupling device image sensor CCD is made of high-sensitivity semiconductor materials. There are many photosensitive units on the CCD, and the CCD is usually in megapixels. When the surface of the CCD is illuminated by light, each photosensitive unit will feedback the charge value, and the signals generated by all the photosensitive units are added together to form a complete picture. Complementary metal oxide semiconductor CMOS is mainly a semiconductor made of two elements: silicon and germanium, so that there are N (charged-charged) and P (charged + charged) semiconductors coexisting on the CMOS. These two The current generated by the complementary effect can be recorded by the processing chip and form an image.

The function of the image processor 240 is to optimize the digital image signal through a series of complex mathematical algorithm operations, and finally transmit the processed signal to the display. The image processor 240 may be an image processing chip or a digital signal processing chip (DSP), and its function is to promptly and quickly transfer the data obtained by the photosensitive chip to the central processing unit and refresh the photosensitive chip.

The camera module 200 may also include a holder, an auto-focus drive component, an infrared-cut filter (IRCF), a circuit board, a connector, and some or all of the components such as peripheral electronic components ( Not shown in the figure). The holder can be used to fix the lens. In addition, an infrared filter can be provided on the holder. The infrared filter can eliminate unnecessary light projected on the image sensor 220 and prevent the image sensor 220 from producing false colors or ripples. Improve its effective resolution and color reproduction. The auto-focus driving component may include a voice coil motor, a driving integrated circuit, etc., for auto-focusing or optical image stabilization of the lens. The circuit board can be a flexible printed circuit (FPC) or a printed circuit board (printed circuit board, PCB), which is used to transmit electrical signals. Among them, the FPC can be a single-sided flexible board, a double-sided flexible board, or a multilayer flexible PCB, rigid-flex board or flexible circuit board with mixed structure, etc. The other components included in the camera module 200 will not be described in detail here.

It should be understood that the “lens” mentioned in the embodiments of this application can be understood as a whole lens, which can include one or more lenses, and the “lens” or “lens” can be understood as a lens in a lens structure or used to form a lens. Lens or lens.

As mentioned above, in the optical system, the lens affects the image quality, and a key indicator of the lens is the aperture F value, which directly affects the camera's core functions such as night scenes, capture, background blur, and video. Since the use of a large aperture (a smaller aperture F value) lens can increase the blurred background of the photo and highlight the subject, it can also increase the shutter speed and focus speed, and has better imaging quality, so the large aperture / super large aperture will be The mainstream trend of mobile phone cameras. The existing lens imaging structure is mostly composed of 5 or 6 plastic lenses, and the minimum aperture F value achieved is 1.5. In addition, with the overall development of mobile phones in the direction of lightness and thinness, the demand for miniaturization of cameras is also increasing, and at the same time, good imaging quality is required. In order to obtain better imaging quality, the size of the photosensitive element and the pixels can be increased, but at the same time, the height of the camera module will also increase.

Therefore, it is necessary to design a camera optical lens that can ensure high imaging performance while meeting the requirements of a large aperture and a small total optical length.

It should be noted that the large aperture in the embodiments of the present application can be understood as an aperture with an aperture F value less than 2, and a super large aperture can be understood as an aperture with an aperture F value less than 1.5.

FIG. 3 shows a schematic structural diagram of an imaging optical lens 300 according to an embodiment of the present application. The camera optical lens 300 of the embodiment of the present application may be the optical lens 210 in the camera module 200 of FIG. 2.

As shown in FIG. 3, the imaging optical lens 300 of the embodiment of the present application includes 7 lenses. For the convenience of description, the left side of the imaging optical lens 300 is defined as the object side (hereinafter also referred to as the object side), the surface of the lens facing the object side can be called the object side, and the object side can also be understood as the surface of the lens close to the object side. The right side of the imaging optical lens 300 is the image side (hereinafter also referred to as the image side), the surface of the lens facing the image side can be referred to as the image side, and the image side can also be understood as the surface of the lens close to the image side. From the object side to the image side, the imaging optical lens 300 of the embodiment of the present application sequentially includes: a first lens 301, a second lens 302, a third lens 303, a fourth lens 304, a fifth lens 305, a sixth lens 306, and a Seven lenses 307.

Optionally, an aperture 310 may be further provided in front of the first lens 301.

Optionally, after the seventh lens 307, an image sensor 309, such as CCD, CMOS, etc., can also be provided.

Optionally, a filter 308, such as a flat infrared cut-off filter, can also be provided between the seventh lens 307 and the image sensor 309.

In an imaging system composed of multiple lenses, different lens combinations (such as the order of the lenses along the optical path, lens material, refractive index, shape curvature, etc.) bring different optical performance and control the light entering the optical system. In the embodiment of the present application, the imaging optical lens 300 includes 7 lenses, of which the main function of the first lens 301 is a positive lens to condense light, the main function of the second lens 302 is a negative lens to diverge light, and the third lens 303 mainly functions as a positive lens Once the light is condensed again, the first lens 301, the second lens 302, and the third lens 303 can reduce the system dispersion aberration through different combinations of dispersion coefficients. In addition, the fourth lens 304 and the fifth lens 305 can diffuse the light to a larger area, and the sixth lens 306 and the seventh lens 307 can correct the curvature of field, distortion, and high-order aberrations of the system. The imaging optical lens 300 will be described in detail below.

It should be noted that, for the convenience of understanding and description, the embodiment of the present application defines the expression form of related parameters of the imaging optical lens 300. For example, EFL is used to represent the effective focal length of the imaging optical lens 300, and Φ1 is used to represent the first lens 301. Focal length, etc., similarly defined letter representations are only illustrative, of course, they can also be represented in other forms, and this application does not make any limitation.

It should also be noted that the units of the parameters involved in the ratio in the following relational expressions are consistent. For example, the unit of the numerator is millimeter (mm), and the unit of the denominator is also millimeters.

It should also be noted that the positive or negative of the radius of curvature means that the optical surface is convex to the object side or convex to the image side, and when the optical surface (including the object side or the image side) is convex to the object side, the radius of curvature of the optical surface is a positive value; When the surface (including the object side surface or the image side surface) is convex toward the image side, it is equivalent to the optical surface being concave on the object side surface, and the radius of curvature of the optical surface is a negative value.

The imaging optical lens 300 of the embodiment of the present application includes in order from the object side to the image side:

The first lens 301, the second lens 302, the third lens 303, the fourth lens 304, the fifth lens 305, the sixth lens 306, and the seventh lens 307.

The imaging optical lens 300 satisfies the following relationship:

1.8≤F≤1.9;

2.0≤TTL/EPD≤2.1;

1.0≤TTL/ImgH≤1.25;

Wherein, F is the aperture of the imaging optical lens 300, EPD (entrance pupil diameter) is the entrance pupil aperture of the imaging optical lens 300, TTL is the total optical length of the imaging optical lens 300, and ImgH is the imaging optical lens The maximum image height of 300. The maximum image height of the imaging optical lens 300 can generally be represented by the diagonal length of the image sensor 309. Among them, EFL/EPD can also be referred to as the aperture F value of the imaging optical lens 300, that is, F can be equal to or approximately equal to EFL/EPD.

It should be understood that the effective focal length of the imaging optical lens 300 can be understood as the effective focal length when the lens included in the imaging optical lens 300 is regarded as an optical lens.

The foregoing relational formula specifies the range of the ratio of the effective focal length of the imaging optical lens 300 to the entrance pupil aperture 1.8≤F≤1.9, which is beneficial for scaling with equal proportions under the same optical system architecture. In addition, when the entrance pupil aperture is fixed, the effective focal length EFL of the imaging optical lens 300 is less than twice the EPD, which is conducive to the realization of a large aperture design of the optical system.

The foregoing relational expression specifies the range of the ratio of the total optical length of the imaging optical lens 300 to the entrance pupil aperture of 2.0≤TTL/EPD≤2.1. In the case of a certain entrance pupil aperture, the total optical length can be shortened, the overall thickness of the imaging optical lens 300 can be reduced, and the space occupied by the imaging optical lens 300 can be reduced.

The above relational expression stipulates the range of the ratio of the total optical length of the imaging optical lens 300 to the maximum image height 1.0≦TTL/ImgH≦1.25. When the size of the image sensor 309 is fixed, the total optical length can be shortened, the overall thickness of the imaging optical lens 300 can be reduced, and the space occupied by the imaging optical lens 300 can be reduced.

Optionally, the camera optical lens satisfies: 1.18≤TTL/ImgH≤1.21.

Optionally, the camera optical lens 300 can also satisfy: 0.85≤LT/TTL≤0.90, where LT is the longest distance on the optical axis from the object side of the first lens 301 to the image side of the seventh lens 307, and TTL is The total optical length of the imaging optical lens 300.

The above relational expression specifies the range of the ratio of the farthest distance from the object side surface of the first lens 301 to the image side surface of the seventh lens 307 on the optical axis to the total optical length 0.85≦LT/TTL≦0.90. When the overall thickness of the imaging optical lens 300 is constant, it is necessary to reserve a movable space for the imaging optical lens 300 to increase the diversity of the positional relationship between different lenses, so that when the imaging optical lens 300 occupies a certain space , Can broaden the working focal length range of the camera optical lens 300.

Optionally, the camera optical lens satisfies: 0.87≤LT/TTL≤0.88.

The structure of each lens of the imaging optical lens is described below.

It should be understood that the aforementioned "lenses of the imaging optical lens" refer to the lenses that make up the imaging optical lens. In the embodiments of the present application, they are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. Lens and seventh lens.

Optionally, in the embodiment of the present application, the first lens 301 may have positive refractive power, the object side of the first lens 301 is convex near the optical axis, and the image side of the first lens 301 is concave near the optical axis. .

Referring to Figure 4 (a), the dashed line is used to indicate the optical axis L of the lens. The object side of the first lens 301 is convex near the optical axis L, and the image side of the first lens 301 is near the optical axis L. It is concave. In the embodiment of the present application, the portion of the optical surface close to the optical axis includes the portion of the optical surface on the optical axis. The object side surface of the first lens 301 is a convex surface close to the optical axis L, which can improve the light gathering ability of the object side surface and reduce the overall thickness of the imaging optical lens 300. The image side surface of the first lens 301 is concave near the optical axis L, which can reduce the astigmatism of the imaging optical lens 300.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (a) in FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, the first lens 301 satisfies: 0.7≤|EFL/Φ1|≤0.80, where Φ1 is the optical power of the first lens 301.

Optionally, the first lens satisfies: 0.76≤|EFL/Φ1|≤0.79.

Optionally, in the embodiment of the present application, the second lens 302 may have a negative refractive power, the object side of the second lens 302 is convex near the optical axis, and the image side of the second lens 302 is near the optical axis. Concave.

Similarly, still referring to Figure 4 (a), the dashed line is used to indicate the optical axis L of the lens, the object side of the second lens 302 is convex near the optical axis L, and the image side of the second lens 302 is at The area close to the optical axis L is a concave surface, so that the spherical aberration and chromatic aberration of the lens of the imaging optical lens 300 can be reduced.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (a) in FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, in the embodiment of the present application, the second lens 302 satisfies: 5.0≤≤(R21+R22)/(R21-R22)≤6.5, where R21 is the radius of curvature of the object side surface of the second lens 302, and R22 is The second lens 302 has a curvature radius of the image side.

The foregoing relational expression specifies the range of the ratio of the radius of curvature of the object side surface of the second lens 302 to the radius of curvature of the image side surface, which is beneficial to reduce the system tolerance sensitivity.

Optionally, the second lens satisfies: 5.5≤(R21+R22)/(R21-R22)≤6.0.

Optionally, in the embodiment of the present application, the third lens 303 may have positive refractive power, the object side surface of the third lens 303 is convex near the optical axis, and the image side surface of the third lens 303 is concave near the optical axis. .

Referring to (b) in FIG. 4, the object side surface of the third lens 303 is convex near the optical axis L, and the image side surface of the third lens 303 is also convex near the optical axis L. Wherein, the third lens 303 may have a positive refractive power, and the object side of the third lens 303 is a convex surface near the optical axis, which is beneficial to balance the overall aberration of the imaging optical lens 300.

It should be noted that the shape of the lens and the degree of unevenness between the object side and the image side in FIG. 4(b) are only schematic and do not impose any limitation on the embodiments of the present application. The embodiments of the present application are far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, the image side surface of the third lens 303 includes at least three inflection points.

In other words, the image side surface of the third lens 303 includes at least two concave surfaces.

Referring to (c) in FIG. 4, the object side surface of the third lens 303 is convex near the optical axis L. The image side surface of the third lens 303 is also convex near the optical axis L, and the convex surface includes three inflection points, so that there are concave surfaces on both sides of the convex surface.

Since the image side surface of the third lens 303 includes both convex and concave surfaces, in fact, the shape of the image side surface of the third lens 303 is neither convex nor concave. In order to make the expression clearer, when a surface includes 3 inflection points, the surface closest to the optical axis of the surface is convex, and the surface is regarded as a convex surface. That is to say, because the inflection point is set on the convex surface, the convexity and concavity on both sides of the convex surface are changed, so that both sides of the convex surface are concave. Further, if five inflection points are included on the convex surface, the surface closest to the optical axis is a convex surface, and there are concave surfaces on both sides of the convex surface, and the side of any concave surface away from the optical axis is a convex surface. The image side surface of the third lens 303 includes at least three inflection points, which is beneficial to improve the overall aberration of the off-axis field of view, that is, the overall aberration at the edge of the image. The image side surface of the third lens 303 includes at least three inflection points, which facilitates the movement of the principal point of the imaging optical lens 300 toward the object space, effectively shortening the effective focal length and the overall thickness of the imaging optical lens 300.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (c) of FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, in the embodiment of the present application, the fourth lens 304 may have negative refractive power, the object side of the fourth lens 304 may be concave near the optical axis, and the image side of the third lens 303 may be near the optical axis. It is convex.

Referring to (d) in FIG. 4, the object side surface of the fourth lens 304 is concave near the optical axis L, and the image side surface of the third lens 303 is convex near the optical axis L. Among them, the fourth lens 304 may have a negative refractive power, which is beneficial to balance the distribution of the negative refractive power of the imaging optical lens 300 and reduce the sensitivity of the imaging optical lens 300.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (d) in FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, in the embodiment of the present application, the fifth lens 305 may have negative refractive power, the object side of the fifth lens 305 is convex near the optical axis, and the image side of the fifth lens 305 is near the optical axis. Concave.

Similarly, still referring to Figure 4 (a), the dashed line is used to indicate the optical axis L of the lens, the object side of the fifth lens 305 is convex near the optical axis L, and the image side of the fifth lens 305 is at The area close to the optical axis L is a concave surface, so that the spherical aberration and chromatic aberration of the lens of the imaging optical lens 300 can be reduced. This is beneficial to enhance the degree of light converging through the fifth lens 305, and effectively shorten the overall thickness of the imaging optical lens 300.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (a) in FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, the fifth lens 305 satisfies: 0.5≤|EFL/R51|+|EFL/R52|≤2, where EFL is the effective focal length of the imaging optical lens 300, and R51 is the object side of the fifth lens 305 R52 is the radius of curvature of the image side surface of the fifth lens 305.

Optionally, the fifth lens satisfies: 0.8≤|EFL/R51|+|EFL/R52|≤1.3.

The above-mentioned relational expression specifies the range of the ratio of the radius of curvature of the object side surface of the fifth lens 305 to the radius of curvature of the image side surface, which facilitates equal scaling when the optical system architecture is the same.

Optionally, in the embodiment of the present application, the sixth lens 306 may have positive refractive power, the object side surface of the sixth lens 306 is convex near the optical axis, and the image side surface of the sixth lens 306 is concave near the optical axis. .

Similarly, still referring to Figure 4 (a), the dash-dotted line is used to indicate the optical axis L of the lens, the object side of the sixth lens 306 is convex near the optical axis L, and the image side of the sixth lens 306 is at The area close to the optical axis L is a concave surface, so that the spherical aberration and chromatic aberration of the lens of the imaging optical lens 300 can be reduced. This is beneficial to enhance the degree of convergence of light passing through the sixth lens 306, and effectively shorten the overall thickness of the imaging optical lens 300.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (a) in FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, the sixth lens 306 satisfies: 1.5≤|EFL/R61|+|EFL/R62|≤2.3, where EFL is the effective focal length of the imaging optical lens 300, and R61 is the object side of the sixth lens 306 R62 is the curvature radius of the image side surface of the sixth lens 306.

Optionally, the sixth lens satisfies: 1.85≤|EFL/R61|+|EFL/R62|≤2.05.

The above-mentioned relational expression specifies the range of the ratio of the radius of curvature of the object side surface of the sixth lens 306 to the radius of curvature of the image side surface, which facilitates equal scaling when the optical system architecture is the same.

Optionally, the sixth lens 306 satisfies: 0.40≤|EFL/Φ6|≤0.60, where Φ6 is the optical power of the sixth lens 306.

Optionally, the sixth lens satisfies: 0.44≤|EFL/Φ6|≤0.52.

Optionally, in the embodiment of the present application, the seventh lens 307 may have negative refractive power, the object side of the seventh lens 307 is concave near the optical axis, and the image side of the seventh lens 307 is near the optical axis. Concave.

Referring to (e) in Figure 4, the dash-dotted line is used to indicate the optical axis L of the lens, the object side of the seventh lens 307 is concave near the optical axis L, and the image side of the seventh lens 307 is near the optical axis L. The place is concave.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (e) of FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, the object side of the seventh lens 307 includes at least three inflection points.

In other words, the object side surface of the seventh lens 307 includes at least two convex surfaces.

Optionally, the image side surface of the seventh lens 307 includes at least three inflection points.

In other words, the image side surface of the seventh lens 307 includes at least two convex surfaces.

Referring to (f) in FIG. 4, the object side surface of the seventh lens 307 is concave near the optical axis L, and the concave surface includes three inflection points, so that there is a convex surface on both sides of the concave surface. The image side surface of the seventh lens 307 is also concave near the optical axis L, and the concave surface includes three inflection points, so that convex surfaces exist on both sides of the concave surface.

Since the object side surface of the seventh lens 307 includes both convex and concave surfaces, in fact, the shape of the object side surface of the seventh lens 307 is neither convex nor concave. Since the image side surface of the seventh lens 307 includes both convex and concave surfaces, in fact, the shape of the image side surface of the seventh lens 307 is neither convex nor concave. In order to make the expression clearer, when a surface includes 3 inflection points, the surface closest to the optical axis of the surface is concave, and the surface is regarded as a concave surface. That is to say, because the inflection point is provided on the concave surface, the convexity and concavity on both sides of the concave surface are changed, so that both sides of the concave surface are convex surfaces. Further, if five inflection points are included on the concave surface, the surface closest to the optical axis is a concave surface, and there are convex surfaces on both sides of the concave surface, and the side of any convex surface away from the optical axis is a concave surface. The object side surface of the seventh lens 307 and/or the image side surface of the seventh lens 307 include at least three inflection points, which is beneficial to improve the overall aberration of the off-axis field of view, that is, the overall aberration at the edge of the image. In addition, the object side surface of the seventh lens 307 and/or the image side surface of the seventh lens 307 includes at least three inflection points, which is beneficial to move the principal point of the imaging optical lens 300 toward the object space, effectively shortening the effective focal length and imaging optics. The overall thickness of the lens 300.

It should be noted that the shape of the lens and the degree of concavity and convexity of the object side and the image side in (f) of FIG. 4 are only schematic and do not impose any limitation on the embodiment of the present application. The embodiment of the present application is far away from the object side and the image side. There are no restrictions on the unevenness and size of the optical axis.

Optionally, each lens of the imaging optical lens 300 is aspherical.

Optionally, the non-curved curve equation of each lens of the imaging optical lens 300 satisfies:

Among them, z is the relative distance between a point on the aspheric surface r from the optical axis and the tangent plane tangent to the intersection on the optical axis of the aspheric surface; r is the vertical distance between a point on the aspheric surface and the optical axis; c is the aspheric light The curvature at the axis; k is the conical coefficient; α _i is the i-th aspheric coefficient.

Optionally, the material of each lens of the imaging optical lens 300 may be a plastic material, or a glass material, or other materials that can meet lens performance requirements, such as composite materials. "Each lens of the imaging optical lens 300" refers to the first lens 301, the second lens 302, the third lens 303, the fourth lens 304, the fifth lens 305, the sixth lens 306, and the seventh lens 307, and can also mean They are the first lens 301 to the seventh lens 307.

In the embodiment of the present application, the maximum refractive index of the imaging optical lens 300 is Nmax, and the minimum refractive index of the imaging optical lens 300 is Nmin, respectively satisfying: 1.65≤Nmax≤1.70 and 1.50≤Nmin≤1.58. The maximum refractive index of the imaging optical lens 300 refers to the refractive index of the lens with the largest refractive index in the imaging optical lens 300; the minimum refractive index of the imaging optical lens 300 refers to the refractive index of the lens with the smallest refractive index in the imaging optical lens 300. The minimum dispersion coefficient of the imaging optical lens 300 is Vmin, and the maximum dispersion coefficient of the imaging optical lens 300 is Vmax, respectively satisfying: Vmin>15 and Vmax<60. The maximum dispersion coefficient of the imaging optical lens 300 refers to the dispersion coefficient of the lens with the largest dispersion coefficient in the imaging optical lens 300; the minimum dispersion coefficient of the imaging optical lens 300 refers to the dispersion coefficient of the lens with the smallest dispersion coefficient in the imaging optical lens 300. By reasonably matching the refractive index and dispersion coefficient of different lenses, the overall aberration of the lens group can be improved, which is beneficial to the miniaturization of the lens group.

Optionally, in the embodiment of the present application, the total optical length TTL of the imaging optical lens 300 is less than or equal to 7.6 mm, which is beneficial to achieve lightness and thinness. Preferably, the total optical length TTL of the imaging optical lens 300 may be 7.53, 7.45, 7.40, etc.

In the embodiment of this application, the thickness of the first lens 301 on the optical axis is CT1, the thickness of the second lens 302 on the optical axis is CT2, the thickness of the third lens 303 on the optical axis is CT3, and the thickness of the fourth lens 304 The thickness on the optical axis is CT4, the thickness of the fifth lens 305 on the optical axis is CT5, the thickness of the sixth lens 306 on the optical axis is CT6, and the thickness of the seventh lens 307 on the optical axis is CT7. The thickness of each lens of the imaging optical lens 300 may satisfy the following conditions: CT6/CT2>2.0, CT6/CT4>2.0, CT6/CT5>2.0, CT6/CT1>1.2, CT6/CT3>1.2, CT6/CT7>1.2. Through the reasonable configuration of different lens thicknesses, the best balance between the miniaturization of the lens group and the manufacturability of the lens can be obtained.

Optionally, the imaging optical lens satisfies: 2.9>CT6/CT2>2.7, and 3.2>CT6/CT4>2.5, and 2.4>CT6/CT5>2.2, and 1.6>CT6/CT1>1.4, and , 1.6>CT6/CT3>1.4, and, 2.2>CT6/CT7>1.5.

In the embodiment of the present application, the field of view of the imaging optical lens 300 is FOV, and 75°≤FOV≤125°. The total optical length of the lens is TTL, the maximum image height is ImgH, and the entrance pupil diameter EPD parameter satisfies 2≤(TTL) ² /(EPD×ImgH)≤2.7. Through appropriate combination of parameters, a high-performance image can be obtained on the large-size image sensor 309, and the imaging optical lens has the characteristics of a large aperture and a compact structure.

Optionally, the camera optical lens satisfies: 2.4≤(TTL) ² /(EPD×ImgH)≤2.5.

In the embodiment of the present application, the maximum optical effective diameter of the object side of the first lens 301 is LD11, the maximum optical effective diameter of the object side of the third lens 303 is LD31, and the first lens 301 and the third lens 303 satisfy 1.0<LD11/LD31 <1.3. By constraining the maximum optical effective diameters of the first lens 301 and the third lens 303, the front port diameter of the lens group can be reduced, thereby reducing the opening at the front end.

According to the relational expression and range given in the embodiments of the present application, through the combination of lens configuration and lens with specific optical design, the imaging optical lens 300 can meet the requirements of small TTL, and at the same time, higher imaging performance can be obtained. .

Hereinafter, some specific but not restrictive examples of the embodiments of the present application will be described in more detail with reference to FIG. 3 and FIG. 5 to FIG. 18.

To facilitate understanding, the embodiments of the present application are described by taking a plastic lens as an example. However, it should be understood that the embodiment of the present application does not specifically limit the material of each lens of the imaging optical lens 300, and other lens materials that can satisfy the correlation equation can also be selected.

Example one

The imaging optical lens 300 of an embodiment of the present application includes in order from the object side to the image side: a first lens 301, a second lens 302, a third lens 303, a fourth lens 304, a fifth lens 305, a sixth lens 306, The seventh lens 307 is shown in FIG. 3.

For ease of description, in the following embodiments, STO represents the surface of the diaphragm 310, S1 represents the object side of the first lens 301, S2 represents the image side of the first lens 301, S3 represents the object side of the second lens 302, and S4 represents the second lens. The image side surface of the lens 302, S5 represents the object side surface of the third lens 303, S6 represents the image side surface of the third lens 303, S7 represents the object side surface of the fourth lens 304, S8 represents the image side surface of the fourth lens 304, and S9 represents the fifth lens. The object side of the lens 305, S10 represents the image side of the fifth lens 305, S11 represents the object side of the sixth lens 306, S12 represents the image side of the sixth lens 306, S13 represents the object side of the seventh lens 307, and S14 represents the seventh lens. For the image side of the lens 307, S15 represents the object side of the infrared filter, and S16 represents the image side of the infrared filter. TTL represents the total optical length of the imaging optical lens 300, ImgH represents the maximum image height of the imaging optical lens 300, and EFL represents the effective focal length of the imaging optical lens 300. _Let α i represent the i-th order aspheric coefficient, i=4, 6, 8, 10, 12, 14, 16, 18, 20. K represents the conical coefficient.

According to the above relational expressions, Tables 1 to 3 show the design data of the imaging optical lens 300 in Example 1.

Table 1 shows the basic parameters of the imaging optical lens 300 in the embodiment of the present application, as shown in Table 1.

Effective focal length EFL	6.71mm
Aperture F value	1.838
Entrance pupil aperture EPD	3.65mm
FOV	85°
Total optical length TTL	7.53mm
Maximum image height ImgH	6.30mm
Design wavelength	650nm, 610nm, 555nm, 510nm, 470nm
LT	6.562mm

Table 1 Example 1 Basic parameters of camera optical lens 300

Table 2 shows the radius of curvature, thickness, material, refractive index, and dispersion coefficient of each constituent lens of the imaging optical lens 300 in the embodiment of the present application, as shown in Table 2.

Table 2 shows an example of the radius of curvature, thickness, material, refractive index, and dispersion coefficient of each constituent lens of the imaging optical lens 300

Wherein, the positive or negative of the radius of curvature indicates that the optical surface is convex toward the object side or the image side, positive indicates that the optical surface is convex toward the object side near the optical axis, and negative indicates that the optical surface is convex toward the image side near the optical axis.

Wherein, the thickness of the diaphragm 310 is negative, which means that the diaphragm 310 is located on the right side of the vertex on the object side axis of the first lens 301.

Table 3 shows the aspheric coefficients of the imaging optical lens 300 of the embodiment of the present application, as shown in Table 3.

Face number	K	ɑ4	ɑ6	ɑ8	ɑ10	ɑ12	ɑ14	ɑ16	ɑ18	ɑ20
S1	0.765038	-0.00284	-0.00692	0.01156	-0.01282	0.008096	-0.00301	0.000616	-5.5E-05	0
S2	0	0.001719	0.009722	-0.01749	0.018966	-0.01148	0.003989	-0.00073	5.2E-05	0
S3	-1.47714	-0.024	0.017209	-0.01768	0.013012	-0.00541	0.00117	-0.0001	0	0
S4	1.245757	-0.03458	0.008801	-0.00423	-0.00063	0.002064	-0.00084	0.000104	0	0
S5	3.936254	-0.01446	0.026425	-0.05327	0.070079	-0.0591	0.032038	-0.0105	0.00188	-0.00014
S6	0	-0.00889	0.006744	-0.01216	0.01518	-0.01198	0.00641	-0.0022	0.000445	-4.1E-05
S7	0	-0.03133	0.001413	-0.00843	0.016575	-0.02012	0.014506	-0.00596	0.001287	-0.00011
S8	0	-0.02983	0.000594	0.012174	-0.02781	0.028306	-0.01614	0.00536	-0.00097	7.45E-05
S9	-99	-0.01785	-0.06819	0.15236	-0.16661	0.106195	-0.04164	0.009871	-0.0013	7.28E-05
S10	-2.7088	-0.06251	0.014116	0.014821	-0.01933	0.01008	-0.00296	0.0005	-4.5E-05	1.66E-06
S11	2.472966	-0.04256	0.000629	-0.0017	0.003149	-0.00201	0.000646	-0.00011	1.05E-05	-3.9E-07
S12	0	-0.00407	-0.01411	0.007537	-0.00237	0.000468	-5.8E-05	4.38E-06	-1.8E-07	3.29E-09
S13	0	-0.06603	0.017831	-0.00398	0.00062	-5.9E-05	3.32E-06	-1.1E-07	1.71E-09	-9.8E-12
S14	-0.77976	-0.07493	0.020427	-0.00432	0.000621	-5.8E-05	3.48E-06	-1.3E-07	2.45E-09	-2E-11

Table 3 Aspheric coefficients of camera optical lens 300

Among them, the non-curved surface of each lens of the imaging optical lens 300 satisfies:

Z is the relative distance between a point on the aspheric surface from the optical axis r and the tangent plane tangent to the intersection on the aspheric optical axis; r is the vertical distance between a point on the aspheric curve and the optical axis; c is the aspheric optical axis Curvature; K is the conical coefficient; ɑ4, ɑ6, ɑ8, ɑ10, ɑ12, ɑ14, ɑ16, ɑ18, ɑ20 are aspherical coefficients.

It should be understood that the aspheric surface of each lens in the imaging optical lens 300 may use the aspheric surface shown in the above aspheric surface formula, or other aspheric surface formulas, which are not limited in this application.

The design data of the imaging optical lens 300 of an embodiment of the present application is given above. The aperture F value is 1.85, the total optical length TTL is 7.53 mm, the effective focal length is 6.71 mm, and the maximum field of view is 85°.

In an embodiment provided in this application, the ratio of the total optical length TTL to the entrance pupil aperture EPD satisfies: TTL/EPD=2.063.

In an embodiment provided by this application, the ratio of the total optical length TTL to the diagonal length ImgH of the effective pixel area of the camera imaging surface satisfies: TTL/ImgH=1.204.

In an embodiment provided in this application, LT/TTL=0.871.

In an embodiment provided by this application, EFL/Φ1=6.71/8.526=0.787.

In an example provided by this application, (R21+R22)/(R21-R22)=(4.4583+3.1313)/(4.4583-3.1313)=5.719.

In an embodiment provided in this application, |EFL/R51|+|EFL/R52|=6.71/28.5476+6.71/11.2951=0.829.

In an embodiment provided by this application, EFL/Φ6=6.71/14.883=0.451.

In an embodiment provided in this application, |EFL/R61|+|EFL/R62|=6.71/5.0836+6.71/9.3876=2.035.

In an embodiment provided by this application, (TTL) ² /(EPD×ImgH)=7.53 ² /(3.65×6.30)=2.466.

In an embodiment provided in this application, the refractive index of the second lens, the refractive index of the fourth lens, the refractive index of the fifth lens, and the refractive index of the sixth lens are all higher than the refractive indexes of other lenses in the imaging optical lens. The maximum refractive index of the imaging optical lens Nmax=1.681.

In an embodiment provided in this application, the refractive index of the third lens is lower than the refractive index of other lenses in the imaging optical lens, so the minimum refractive index of the imaging optical lens Nmin=1.535.

In an embodiment provided in this application, the dispersion coefficient of the third lens is higher than the dispersion coefficients of other lenses in the imaging optical lens, so the maximum dispersion coefficient of the imaging optical lens Vmax=57.10.

In an embodiment provided in this application, the dispersion coefficient of the second lens, the dispersion coefficient of the fourth lens, the dispersion coefficient of the fifth lens, and the dispersion coefficient of the sixth lens are all lower than the dispersion coefficients of other lenses in the imaging optical lens. The minimum dispersion coefficient of the imaging optical lens Vmin = 18.44.

In an embodiment provided by this application, the thickness of the first lens 301 of the optical lens on the optical axis is CT1 = 0.5723 mm, the thickness of the second lens 302 on the optical axis is CT2 = 0.3153 mm, and the third lens 303 is on the optical axis. The thickness of the upper lens is CT3=0.5751mm, the thickness of the fourth lens 304 on the optical axis is CT4=0.3000mm, the thickness of the fifth lens 305 on the optical axis is CT5=0.3806mm, and the thickness of the sixth lens 306 on the optical axis The thickness is CT6=0.9000mm, and the thickness of the seventh lens 307 on the optical axis is CT7=0.5538mm. CT6/CT2=2.85, CT6/CT4=3.0, CT6/CT5=2.36, CT6/CT1=1.57, CT6/CT3=1.56, CT6/CT7=1.63.

In an embodiment provided in this application, the maximum optical effective diameter of the object side of the first lens 301 is LD11, and the maximum optical effective diameter of the object side of the third lens 303 is LD32, where LD11/LD32=1.825/1.5722=1.16.

FIGS. 5-8 illustrate the optical performance of the imaging optical lens 300 designed in this lens combination manner as an example.

FIG. 5 shows the axial chromatic aberration of light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 300 of Example 1.

FIG. 6 shows the vertical axis chromatic aberration of light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 300 of Example 1.

FIG. 7 shows a schematic diagram of optical distortion of light with a wavelength of 650 nm after passing through the imaging optical lens 300 of Example 1.

FIG. 8 shows a schematic diagram of meridional astigmatism and sagittal astigmatism of light with a wavelength of 650 nm after passing through the imaging optical lens 300 of Example 1.

In Example 1, the total optical length of the camera optical lens is reduced, which can be easily installed in the electronic device, occupies relatively little internal space of the electronic device, and basically does not affect the thickness of the electronic device. And can obtain a smaller aperture F value (that is, the camera optical lens has a larger aperture), so a shorter depth of field can be achieved, so that the camera optical lens can obtain a better blur effect; in addition, a larger aperture can increase the camera optics The amount of light entering the lens can achieve better imaging performance at night.

Example two

The imaging optical lens 900 of an embodiment of the present application includes, from the object side to the image side, in order: a first lens 901, a second lens 902, a third lens 903, a fourth lens 904, a fifth lens 905, a sixth lens 906, The seventh lens 907 is shown in FIG. 9.

For ease of description, in the following embodiments, STO represents the surface of the diaphragm 910, S1 represents the object side of the first lens 901, S2 represents the image side of the first lens 901, S3 represents the object side of the second lens 902, and S4 represents the second lens. The image side surface of the lens 902, S5 represents the object side surface of the third lens 903, S6 represents the image side surface of the third lens 903, S7 represents the object side surface of the fourth lens 904, S8 represents the image side surface of the fourth lens 904, and S9 represents the fifth lens. The object side of the lens 905, S10 represents the image side of the fifth lens 905, S11 represents the object side of the sixth lens 906, S12 represents the image side of the sixth lens 906, S13 represents the object side of the seventh lens 907, and S14 represents the seventh lens. For the image side surface of the lens 907, S15 represents the object side surface of the infrared filter, and S16 represents the image side surface of the infrared filter. TTL represents the total optical length of the imaging optical lens 900, ImgH represents the maximum image height of the imaging optical lens 900, and EFL represents the effective focal length of the imaging optical lens 900. _Let α i represent the i-th order aspheric coefficient, i=4, 6, 8, 10, 12, 14, 16, 18, 20. K represents the conical coefficient.

According to the above relational expressions, Tables 4 to 6 show the design data of the imaging optical lens 900 in Example 2.

Table 4 shows the basic parameters of the imaging optical lens 900 in the embodiment of the present application, as shown in Table 4.

Effective focal length EFL	6.70mm
Aperture F value	1.851
Entrance pupil aperture EPD	3.62mm
FOV	85°
Total optical length TTL	7.45mm
Maximum image height ImgH	6.30mm
Design wavelength	650nm, 610nm, 555nm, 510nm, 470nm
LT	6.545mm

Table 4 Example 2 Basic parameters of camera optical lens 900

Table 5 shows the radius of curvature, thickness, material, refractive index, and dispersion coefficient of each constituent lens of the imaging optical lens 900 in the embodiment of the present application, as shown in Table 5.

Table 5 Example 2 The radius of curvature, thickness, material, refractive index, and dispersion coefficient of each constituent lens of the imaging optical lens 900

Wherein, the positive or negative of the radius of curvature indicates that the optical surface is convex toward the object side or the image side, positive indicates that the optical surface is convex toward the object side near the optical axis, and negative indicates that the optical surface is convex toward the image side near the optical axis.

The thickness of the diaphragm 910 is negative, which means that the diaphragm 910 is located on the right side of the vertex on the object side axis of the first lens 901.

Table 6 shows the aspheric coefficients of the imaging optical lens 900 of the embodiment of the present application, as shown in Table 6.

Table 6 Aspheric coefficients of the imaging optical lens 900

Among them, the non-curved surface of each lens of the imaging optical lens 900 satisfies:

Z is the relative distance between a point on the aspheric surface from the optical axis r and the tangent plane tangent to the intersection on the aspheric optical axis; r is the vertical distance between a point on the aspheric curve and the optical axis; c is the aspheric optical axis Curvature; K is the conical coefficient; ɑ4, ɑ6, ɑ8, ɑ10, ɑ12, ɑ14, ɑ16, ɑ18, ɑ20 are aspherical coefficients.

It should be understood that the aspheric surface of each lens in the imaging optical lens 900 may use the aspheric surface shown in the above aspheric surface formula, or other aspheric surface formulas, which are not limited in this application.

The design data of the imaging optical lens 900 of an embodiment of the present application is given above. The aperture F value is 1.85, the total optical length TTL is 7.45 mm, the effective focal length is 6.70 mm, and the maximum field of view is 85°.

In an embodiment provided in this application, the ratio of the total optical length TTL to the entrance pupil aperture EPD satisfies: TTL/EPD=2.058.

In an embodiment provided in this application, the ratio of the total optical length TTL to the diagonal length ImgH of the effective pixel area of the camera imaging surface satisfies: TTL/ImgH=1.192.

In an embodiment provided in this application, LT/TTL=0.879.

In an embodiment provided by this application, EFL/Φ1=0.70/8.643=0.775.

In an example provided by this application, (R21+R22)/(R21-R22)=(4.4802+3.1218)/(4.4802-3.1218)=5.596.

In an embodiment provided in this application, |EFL/R51|+|EFL/R52|=6.70/14.4907+6.70/9.7742=1.148.

In an embodiment provided by this application, EFL/Φ6=0.70/12.975=0.516.

In an embodiment provided in this application, |EFL/R61|+|EFL/R62|=6.70/5.0439+6.70/11.9957=1.887.

In an embodiment provided by this application, (TTL) ² /(EPD×ImgH)=7.45 ² /(3.62×6.30)=2.434.

In an embodiment provided in this application, the refractive index of the second lens, the refractive index of the fourth lens, the refractive index of the fifth lens, and the refractive index of the sixth lens are all higher than the refractive indexes of other lenses in the imaging optical lens. The maximum refractive index of the imaging optical lens Nmax=1.681.

In an embodiment provided in this application, the refractive index of the third lens is lower than the refractive index of other lenses in the imaging optical lens, so the minimum refractive index of the imaging optical lens Nmin=1.535.

In an embodiment provided in this application, the dispersion coefficient of the third lens is higher than the dispersion coefficients of other lenses in the imaging optical lens, so the maximum dispersion coefficient of the imaging optical lens Vmax=57.10.

In an embodiment provided in this application, the dispersion coefficient of the second lens, the dispersion coefficient of the fourth lens, and the dispersion coefficient of the fifth lens are all lower than the dispersion coefficients of other lenses in the imaging optical lens, so the minimum dispersion coefficient of the imaging optical lens Vmin = 18.44.

In an embodiment provided in this application, the thickness of the first lens 901 of the optical lens on the optical axis is CT1 = 0.5699 mm, the thickness of the second lens 902 on the optical axis is CT2 = 0.3005 mm, and the third lens 903 is on the optical axis. The thickness of the upper lens is CT3=0.5690mm, the thickness of the fourth lens 904 on the optical axis is CT4=0.3000m, the thickness of the fifth lens 905 on the optical axis is CT5=0.3730mm, and the thickness of the sixth lens 906 on the optical axis The thickness is CT6 = 0.8500 mm, and the thickness of the seventh lens 907 on the optical axis is CT7 = 0.4002 mm. CT6/CT2=2.83, CT6/CT4=2.83, CT6/CT5=2.28, CT6/CT1=1.49, CT6/CT3=1.49, CT6/CT7=2.12.

In an embodiment provided in the present application, the maximum optical effective diameter of the object side of the first lens 901 is LD11, and the maximum optical effective diameter of the object side of the third lens 903 is LD32, where LD11/LD32=1.800/1.5561=1.16.

Figures 10-13 illustrate the optical performance of the imaging optical lens 900 designed in the lens combination of Example 2.

FIG. 10 shows the axial chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 900 of Example 2.

FIG. 11 shows the vertical chromatic aberration of light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 900 of Example 2.

FIG. 12 shows a schematic diagram of optical distortion of light with a wavelength of 650 nm after passing through the imaging optical lens 900 of Example 2.

FIG. 13 shows a schematic diagram of meridional astigmatism and sagittal astigmatism of light with a wavelength of 650 nm after passing through the imaging optical lens 900 of Example 2.

In the second example, the total optical length of the camera optical lens is reduced, which can be easily installed in the electronic device, occupies relatively little internal space of the electronic device, and basically does not affect the thickness of the electronic device. And can obtain a smaller aperture F value (that is, the camera optical lens has a larger aperture), so a shorter depth of field can be achieved, so that the camera optical lens can obtain a better blur effect; in addition, a larger aperture can increase the camera optics The amount of light entering the lens can achieve better imaging performance at night. Compared with example 1, the aperture value of example 2 is relatively large (that is, the imaging optical lens in example 2 has a smaller aperture), the light entrance is reduced by about one percent, and the total optical length of the imaging optical lens is significantly reduced. The camera optical lens structure in the camera is more compact and easy to install in electronic equipment.

Example three

From the object side to the image side, the imaging optical lens 1400 of an embodiment of the present application includes in order from the object side to the image side: a first lens 1401, a second lens 1402, a third lens 1403, a fourth lens 1404, a fifth lens 1405, a sixth lens 1406, The seventh lens 1407 is shown in FIG. 14.

For ease of description, in the following embodiments, STO represents the surface of the diaphragm 1410, S1 represents the object side of the first lens 1401, S2 represents the image side of the first lens 1401, S3 represents the object side of the second lens 1402, and S4 represents the second lens. The image side surface of the lens 1402, S5 represents the object side surface of the third lens 1403, S6 represents the image side surface of the third lens 1403, S7 represents the object side surface of the fourth lens 1404, S8 represents the image side surface of the fourth lens 1404, and S14 represents the fifth lens. The object side of the lens 1405, S10 represents the image side of the fifth lens 1405, S11 represents the object side of the sixth lens 1406, S12 represents the image side of the sixth lens 1406, S13 represents the object side of the seventh lens 1407, and S14 represents the seventh lens. For the image side of the lens 1407, S15 represents the object side of the infrared filter, and S16 represents the image side of the infrared filter. TTL represents the total optical length of the imaging optical lens 1400, ImgH represents the maximum image height of the imaging optical lens 1400, and EFL represents the effective focal length of the imaging optical lens 1400. _Let α i represent the i-th order aspheric coefficient, i=4, 6, 8, 10, 12, 14, 16, 18, 20. K represents the conical coefficient.

According to the above relational expressions, Tables 7 to 9 show the design data of the imaging optical lens 1400 in Example 3.

Table 7 shows the basic parameters of the imaging optical lens 1400 in the embodiment of the present application, as shown in Table 7.

Effective focal length EFL	6.70mm
Aperture F value	1.861
Entrance pupil aperture EPD	3.6mm
FOV	85°
Total optical length TTL	7.40mm
Maximum image height ImgH	6.30mm
Design wavelength	650nm, 610nm, 555nm, 510nm, 470nm
LT	6.495mm

Table 7 Examples of basic parameters of three-camera optical lens 1400

Table 8 shows the radius of curvature, thickness, material, refractive index, and dispersion coefficient of each constituent lens of the imaging optical lens 1400 in the embodiment of the present application, as shown in Table 8.

Table 8 Examples of the radius of curvature, thickness, material, refractive index, and dispersion coefficient of each constituent lens of the three-camera optical lens 1400

Wherein, the positive or negative of the radius of curvature indicates that the optical surface is convex toward the object side or the image side, positive indicates that the optical surface is convex toward the object side near the optical axis, and negative indicates that the optical surface is convex toward the image side near the optical axis.

Wherein, the thickness of the diaphragm 1410 is negative, which means that the diaphragm 1410 is located on the right side of the apex on the object side axis of the first lens 1401.

Table 9 shows the aspheric coefficients of the imaging optical lens 1400 of the embodiment of the present application, as shown in Table 9.

Table 9 Aspheric coefficients of camera optical lens 1400

Among them, the non-curved surface of each lens of the imaging optical lens 1400 satisfies:

Z is the relative distance between a point on the aspheric surface from the optical axis r and the tangent plane tangent to the intersection on the aspheric optical axis; r is the vertical distance between a point on the aspheric curve and the optical axis; c is the aspheric optical axis Curvature; K is the conical coefficient; ɑ4, ɑ6, ɑ8, ɑ10, ɑ12, ɑ14, ɑ16, ɑ18, ɑ20 are aspherical coefficients.

It should be understood that the aspheric surface of each lens in the imaging optical lens 1400 may use the aspheric surface shown in the above aspheric surface formula, or other aspheric surface formulas, which are not limited in this application.

The design data of the imaging optical lens 1400 of an embodiment of the present application is given above, the aperture F value is 1.85, the total optical length TTL is 7.40 mm, the effective focal length is 6.70 mm, and the maximum field angle is 85°.

In an embodiment provided in this application, the ratio of the total optical length TTL to the entrance pupil aperture EPD satisfies: TTL/EPD=2.056.

In an embodiment provided in this application, the ratio of the total optical length TTL to the diagonal length ImgH of the effective pixel area of the camera imaging surface satisfies: TTL/ImgH=1.184.

In an embodiment provided in this application, LT/TTL=0.878

In an embodiment provided by this application, EFL/Φ1=0.70/8.709=0.769.

In an example provided by this application, (R21+R22)/(R21-R22)=(4.3317+3.0849)/(4.3317-3.0849)=5.949.

In an embodiment provided in this application, |EFL/R51|+|EFL/R52|=6.70/12.9205+6.70/8.9275=1.269.

In an embodiment provided by this application, EFL/Φ6=0.70/13.062=0.513.

In an embodiment provided by this application, |EFL/R61|+|EFL/R62|=6.70/5.0291+6.70/11.8212=1.899.

In an embodiment provided by this application, (TTL) ² /(EPD×ImgH)=7.40 ² /(3.6×6.30)=2.414.

In an embodiment provided in this application, the refractive index of the second lens, the refractive index of the fourth lens, the refractive index of the fifth lens, and the refractive index of the sixth lens are all higher than the refractive indexes of other lenses in the imaging optical lens. The maximum refractive index of the imaging optical lens Nmax=1.681.

In an embodiment provided in this application, the refractive index of the third lens is lower than the refractive index of other lenses in the imaging optical lens, so the minimum refractive index of the imaging optical lens Nmin=1.535.

In an embodiment provided in this application, the dispersion coefficient of the third lens is higher than the dispersion coefficients of other lenses in the imaging optical lens, so the maximum dispersion coefficient of the imaging optical lens Vmax=57.10.

In an embodiment provided in this application, the dispersion coefficient of the second lens, the dispersion coefficient of the fourth lens, and the dispersion coefficient of the fifth lens are all lower than the dispersion coefficients of other lenses in the imaging optical lens, so the minimum dispersion coefficient of the imaging optical lens Vmin = 18.44.

In an embodiment provided by this application, the thickness of the first lens 1401 of the optical lens on the optical axis is CT1 = 0.5692 mm, the thickness of the second lens 1402 on the optical axis is CT2 = 0.2909 mm, and the third lens 1403 is on the optical axis. The thickness of the upper lens is CT3=0.5597mm, the thickness of the fourth lens 1404 on the optical axis is CT4=0.3000mm, the thickness of the fifth lens 1405 on the optical axis is CT5=0.3555mm, and the thickness of the sixth lens 1406 on the optical axis The thickness is CT6 = 0.8114 mm, and the thickness of the seventh lens 1407 on the optical axis is CT7 = 0.4000 mm. CT6/CT2=2.78, CT6/CT4=2.70, CT6/CT5=2.28, CT6/CT1=1.44, CT6/CT3=1.45, CT6/CT7=2.03.

In an embodiment provided by this application, the maximum optical effective diameter of the object side of the first lens 1401 is LD11, and the maximum optical effective diameter of the object side of the third lens 1403 is LD32, where LD11/LD32=1.8000/1.4464=1.24.

Figures 15-18 describe the optical performance of the imaging optical lens 1400 designed in the lens combination of Example Three.

FIG. 15 shows the axial chromatic aberration of light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 1400 of Example 3.

FIG. 16 shows the vertical chromatic aberration of light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the imaging optical lens 1400 of Example 3.

FIG. 17 shows a schematic diagram of optical distortion of light with a wavelength of 650 nm after passing through the imaging optical lens 1400 of Example 3.

FIG. 18 shows a schematic diagram of meridional astigmatism and sagittal astigmatism of light with a wavelength of 650 nm after passing through the imaging optical lens 1400 of Example 3.

In the third example, the total optical length of the camera optical lens is reduced, which can be easily installed in the electronic device, occupies relatively little internal space of the electronic device, and basically does not affect the thickness of the electronic device. And can obtain a smaller aperture F value (that is, the camera optical lens has a larger aperture), so a shorter depth of field can be achieved, so that the camera optical lens can obtain a better blur effect; in addition, a larger aperture can increase the camera optics The amount of light entering the lens can achieve better imaging performance at night. Compared with example 2, the aperture value of example 3 is relatively large (that is, the camera optics lens in example 3 has a smaller aperture), the light entrance is reduced by about one percent, and the total optical length of the camera optics lens is significantly reduced. Example 3 The camera optical lens structure in the camera is more compact and easy to install in electronic equipment.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (25)

1. A photographic optical lens, characterized in that, from the object side to the image side sequentially includes:

   The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens;

   The camera optical lens satisfies the following relationship:

   1.8≤F≤1.9; and,

   2.0≤TTL/EPD≤2.1; and,

   1.0≤TTL/ImgH≤1.25;

   Wherein, F is the aperture of the imaging optical lens, EPD is the entrance pupil aperture of the imaging optical lens, TTL is the total optical length of the imaging optical lens, and ImgH is the maximum image height of the imaging optical lens.
2. The imaging optical lens of claim 1, wherein the imaging optical lens satisfies: 1.18≤TTL/ImgH≤1.21.
3. The imaging optical lens of claim 1 or 2, wherein the imaging optical lens satisfies:

   0.85≤LT/TTL≤0.90, where LT is the farthest distance on the optical axis from the object side of the first lens to the image side of the seventh lens.
4. The imaging optical lens of claim 3, wherein the imaging optical lens satisfies: 0.87≤LT/TTL≤0.88.
5. The imaging optical lens according to any one of claims 1 to 4, wherein the first lens satisfies:

   0.7≤|EFL/Φ1|≤0.80, where Φ1 is the optical power of the first lens, and EFL is the effective focal length of the imaging optical lens.
6. The imaging optical lens of claim 5, wherein the first lens satisfies:

   0.76≤|EFL/Φ1|≤0.79.
7. The imaging optical lens according to any one of claims 1 to 6, wherein the second lens satisfies:

   5.0≤(R21+R22)/(R21-R22)≤6.5, where R21 is the radius of curvature of the object side surface of the second lens, and R22 is the radius of curvature of the image side surface of the second lens.
8. 8. The imaging optical lens of claim 7, wherein the second lens satisfies:

   5.5≤(R21+R22)/(R21-R22)≤6.0.
9. The imaging optical lens according to any one of claims 1 to 8, wherein:

   The image side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens includes at least three inflection points.
10. The imaging optical lens according to any one of claims 1 to 9, wherein the fifth lens satisfies:

    0.5≤|EFL/R51|+|EFL/R52|≤2.0, where EFL is the effective focal length of the imaging optical lens, R51 is the radius of curvature of the object side of the fifth lens, and R52 is the fifth lens The radius of curvature of the image side.
11. 11. The imaging optical lens of claim 10, wherein the fifth lens satisfies:

    0.8≤|EFL/R51|+|EFL/R52|≤1.3.
12. The imaging optical lens according to any one of claims 1 to 11, wherein the sixth lens satisfies:

    0.40≤|EFL/Φ6|≤0.60, where EFL is the effective focal length of the imaging optical lens, and Φ6 is the optical power of the sixth lens.
13. The imaging optical lens of claim 12, wherein the sixth lens satisfies:

    0.44≤|EFL/Φ6|≤0.52.
14. The imaging optical lens according to any one of claims 1 to 13, wherein the sixth lens satisfies:

    1.5≤|EFL/R61|+|EFL/R62|≤2.3, where EFL is the effective focal length of the imaging optical lens, R61 is the radius of curvature of the object side of the sixth lens, and R62 is the sixth lens The radius of curvature of the image side.
15. The imaging optical lens of claim 14, wherein the sixth lens satisfies:

    1.85≤|EFL/R61|+|EFL/R62|≤2.05.
16. The imaging optical lens according to any one of claims 1 to 15, wherein:

    The object side surface of the seventh lens is concave at the near optical axis, and the object side surface of the seventh lens includes at least three inflection points, and/or,

    The image side surface of the seventh lens is concave at the near optical axis, and the image side surface of the seventh lens includes at least three inflection points.
17. The imaging optical lens according to any one of claims 1 to 16, wherein the imaging optical lens satisfies:

    2≤(TTL) ² /(EPD×ImgH)≤2.7.
18. The imaging optical lens of claim 17, wherein the imaging optical lens satisfies:

    2.4≤(TTL) ² /(EPD×ImgH)≤2.5.
19. The imaging optical lens according to any one of claims 1 to 18, wherein the imaging optical lens satisfies:

    1.65≤Nmax≤1.70, and 1.50≤Nmin≤1.58, where Nmax is the maximum refractive index of the imaging optical lens, and Nmin is the minimum refractive index of the imaging optical lens.
20. The imaging optical lens according to any one of claims 1 to 19, wherein the imaging optical lens satisfies:

    15≤Vmin≤20, and 55≤Vmax≤60, where Vmax is the maximum dispersion coefficient of the imaging optical lens, and Vmin is the minimum dispersion coefficient of the imaging optical lens.
21. The imaging optical lens according to any one of claims 1 to 20, wherein the imaging optical lens satisfies:

    3.5>CT6/CT2>2.0, and, 4.0>CT6/CT4>2.0, and, 2.5>CT6/CT5>2.0, and, 2.0>CT6/CT1>1.2, and, 2.0>CT6/CT3>1.2, and, 3.0>CT6/CT7>1.2;

    Among them, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, and CT7 is the thickness of the seventh lens on the optical axis.
22. The imaging optical lens of claim 21, wherein the imaging optical lens satisfies: 2.9>CT6/CT2>2.7, and 3.2>CT6/CT4>2.5, and 2.4>CT6/CT5>2.2, And, 1.6>CT6/CT1>1.4, and 1.6>CT6/CT3>1.4, and, 2.2>CT6/CT7>1.5.
23. The imaging optical lens according to any one of claims 1 to 22, wherein the imaging optical lens satisfies:

    1.0<LD11/LD31<1.3, where LD11 is the maximum optical effective diameter of the object side of the first lens, and LD31 is the maximum optical effective diameter of the object side of the third lens.
24. A camera module, characterized by comprising a motor and the camera optical lens according to any one of claims 1 to 23, and the motor is used to drive the camera optical lens for focusing and/or optical image stabilization.
25. An electronic device, comprising a processor and a camera module as claimed in claim 24, the camera module is used to obtain image data and input the image data into the processor, so that The processor processes the image data.

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