Electronic equipment, zoom lens and camera module

Abstract

The invention provides electronic equipment, a zoom lens and a camera module, relates to the field of optical lenses, and aims to reduce the quality and cost of the zoom lens, improve the imaging quality of the zoom lens and obtain the zoom lens with low cost, light weight and high imaging quality. The electronic equipment comprises an image processor and a camera module which are in communication connection with each other. The camera module comprises a zoom lens, the zoom lens comprises a first lens group arranged close to the object side, and the first lens group comprises a first lens; the first lens is made of a first high-molecular compound material; the first lens group further comprises a second lens, the second lens is made of a second high-molecular compound material, and the refractive power of the second lens is opposite to that of the first lens.

Description

Technical Field

[0001] This application relates to the field of optical lenses, and more particularly to electronic devices, zoom lenses, and camera modules. Background Technology

[0002] As users' requirements for camera modules to capture various shooting scenarios become more diverse, the market demand for camera modules that can accommodate multiple shooting scenarios is increasing, and the inclusion of zoom lenses has become a development trend for camera modules.

[0003] Zoom lenses include a lens group that allows you to change the focal length, adjusting the field of view and shooting range. To achieve low cost and lightweight zoom lenses, low-cost, lightweight plastic lenses are typically used to replace the glass lenses in the first lens group. However, the refractive index of plastic lenses is prone to change and their coefficient of linear expansion is relatively large when the temperature changes, resulting in poor focusing performance of the first lens group at different temperatures, thus affecting the image quality of the zoom lens. Summary of the Invention

[0004] Embodiments of this application provide an electronic device, a zoom lens, and a camera module for reducing the weight and cost of the zoom lens, improving the imaging quality of the zoom lens, and obtaining a zoom lens that balances low cost, lightweight design, and high imaging quality.

[0005] In a first aspect, an electronic device is provided. The electronic device includes an image processor and a camera module communicatively connected to each other; the camera module includes a zoom lens, the zoom lens including a first lens group disposed near the object side, the first lens group including a first lens; the first lens is made of a first polymer compound material; the first lens group further includes a second lens, the second lens being made of a second polymer compound material, and the second lens having a refractive power opposite to that of the first lens. In this solution, the first lens may have a positive refractive power and the second lens may have a negative refractive power, or the first lens may have a negative refractive power and the second lens may have a negative refractive power.

[0006] In the first lens group of the zoom lens, a first lens and a second lens with opposite refractive force directions are provided. The first lens and the second lens produce opposite refractive effects on the light entering the first lens group from the object side, thereby canceling out at least part of the refractive effect. Since the first lens is made of a first polymer compound material and the second lens is made of a second polymer compound material, the refractive index and linear expansion coefficient of the first lens and the second lens change in the same trend when the temperature changes, and the refractive cancellation effect between the first lens and the second lens is always superior. In this way, the significant change in the refractive effect of the first lens group due to temperature changes can be greatly alleviated. The first lens group has stable focusing performance at different temperatures, and the zoom lens has better aberration correction, which can significantly improve the image quality of the zoom lens. In addition, replacing the glass lens with the first lens made of the first polymer compound material and the second lens made of the second polymer compound material can reduce the cost of the zoom lens and achieve weight reduction, so as to obtain a zoom lens that balances low cost, weight reduction and high image quality.

[0007] In one possible implementation, the first lens has negative refractive power, the second lens has positive refractive power, and the first lens group satisfies the following relationship: 0.7 ≤ |f1 / f2| ≤ 2.3; where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens. In some examples, 0.9 ≤ |f1 / f2| ≤ 1.1.

[0008] By controlling the absolute ratio of the focal length of the first lens to the absolute value of the second lens within the above range, the difference between the absolute values ​​of the refractive power of the first lens and the second lens is moderate. When the temperature changes, the changes in the refractive index of the first lens and the second lens are close to or equal. The changes in the (expansion / contraction) of the first lens and the second lens are close to or equal. The refractive cancellation effect between the first lens and the second lens is always better. The first lens group has a stable focusing effect at different temperatures, and the imaging quality of the zoom lens in the electronic device is better.

[0009] In one possible implementation, the first lens and the second lens satisfy the following relationship: -30.0 ≤ dnd / dT ≤ -1.0; where dnd is the change in refractive index of the first lens and the second lens, dT is the temperature at which the refractive index of the first lens and the second lens changes, and the unit of dnd / dT is 10. -5 / ℃. Among them, dnd can be applied to the variation of the refractive index of the d-line (587.56nm) of the first lens and the second lens.

[0010] By controlling the ratio of the refractive index of the first lens and the second lens to the temperature change within the above range, the ratio of the refractive index of the first lens and the second lens to the temperature change is moderate, the refractive cancellation effect of the first lens and the second lens is better, the amount of change of the refractive power of the first lens group with temperature change is moderate, the first lens group is easy to focus, the zoom lens in electronic devices has better image quality, in addition, the first lens and the second lens are lightweight and low cost, making it easy to achieve lightweight and low cost zoom lens.

[0011] In one possible implementation, the first polymeric compound material is the same as the second polymeric compound material.

[0012] When the temperature changes, the refractive index of the first lens and the second lens changes by the same amount, and the (expansion / contraction) changes of the first lens and the second lens are equal. The refractive cancellation effect between the first lens and the second lens is excellent. The refractive effect of the first lens group hardly changes with temperature. The first lens group has stable focusing performance at different temperatures. The zoom lens has better aberration correction and can significantly improve the image quality of the zoom lens.

[0013] In one possible implementation, the zoom lens satisfies the following relationship: Where F1 represents the focal length of the first lens group, F w F represents the focal length of a zoom lens at the wide-angle end. t This represents the focal length of a zoom lens at the telephoto end.

[0014] The focal length of the first lens group is moderate, and light can be effectively focused through the first lens group. This can alleviate the problem of light being difficult to focus, which affects the high zoom ratio of the zoom lens, and also alleviate the problem of light focusing too early, which affects the wide-angle end of the zoom lens.

[0015] In one possible implementation, the first lens group further includes a third lens and a fourth lens; the third lens has a refractive power opposite to that of the fourth lens; the third lens is made of a third polymer compound material, and the fourth lens is made of a fourth polymer compound material. In some embodiments, the third polymer compound material and the fourth polymer compound material are the same.

[0016] When the temperature changes, the refractive index and linear expansion coefficient of the third and fourth lenses change in the same way, and the refractive cancellation effect between the third and fourth lenses is always better. In this way, the cost of zoom lenses can be further reduced and the zoom lens can be made lighter.

[0017] In one possible implementation, the first lens group further includes at least one glass lens. In some examples, the glass lens is located at the position closest to the object side of the first lens group.

[0018] In this way, the glass lens can ensure the focusing effect of light entering the zoom lens from the object side, thereby improving the zoom performance and image quality of the zoom lens.

[0019] In one possible implementation, the zoom lens includes a second lens group, which is a zoom lens group located on the side of the first lens group away from the object side. In some examples, the refractive power of the second lens is negative.

[0020] In one possible implementation, the optical surface of the first lens and / or the optical surface of the second lens includes aspherical surfaces.

[0021] This helps to correct aberrations in zoom lenses, improve their resolution, reduce their size, and facilitate the miniaturization of electronic devices.

[0022] In a second aspect, a zoom lens is provided, comprising: a first lens group disposed near the object side, the first lens group including a first lens; the first lens being made of a first polymer compound material; the first lens group further comprising a second lens, the second lens being made of a second polymer compound material, the second lens having a refractive power opposite to that of the first lens.

[0023] In one possible implementation, the first lens has negative refractive power, the second lens has positive refractive power, and the first lens group satisfies the following relationship: 0.7≤|f1 / f2|≤2.3; where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.

[0024] In one possible implementation, the first lens and the second lens satisfy the following relationship: -30.0 ≤ dnd / dT ≤ -1.0; where dnd is the change in refractive index of the first lens and the second lens, dT is the temperature at which the refractive index of the first lens and the second lens changes, and the unit of dnd / dT is 10. -5 / ℃. Among them, dnd can be applied to the variation of the refractive index of the d-line (587.56nm) of the first lens and the second lens.

[0025] In one possible implementation, the first polymeric compound material is the same as the second polymeric compound material.

[0026] In one possible implementation, the zoom lens satisfies the following relationship: 1.0 ≤ F1 / √F w ×F t ≤5.0; where F1 represents the focal length of the first lens group, F w F represents the focal length of a zoom lens at the wide-angle end. t This represents the focal length of a zoom lens at the telephoto end.

[0027] In one possible implementation, the first lens group further includes a third lens and a fourth lens; the third lens has a refractive force opposite to that of the fourth lens; the third lens is made of a third polymer compound material, and the fourth lens is made of a fourth polymer compound material.

[0028] Thirdly, a camera module is provided, the camera module comprising: a photosensitive element and a zoom lens according to any possible implementation of the second aspect, wherein the photosensitive element is located on the image side of the zoom lens.

[0029] The technical effects of any possible implementation of the second and third aspects can be found in the technical effects of different implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic structural diagram of an electronic device provided in an embodiment of this application;

[0032] Figure 2 yes Figure 1 A schematic diagram of the partial structure of the electronic device shown, cut along line A1-A2;

[0033] Figure 3 These are some structural schematic diagrams of the first lens group in the zoom lens provided in the embodiments of this application;

[0034] Figure 4 These are some other structural schematic diagrams of the first lens group in the zoom lens provided in the embodiments of this application;

[0035] Figure 5 These are some further structural schematic diagrams of the first lens group in the zoom lens provided in the embodiments of this application;

[0036] Figure 6 These are some structural schematic diagrams of the camera module in the electronic device provided in the embodiments of this application;

[0037] Figure 7 yes Figure 6 Some simulation results of the wide-angle end of the zoom lens in the camera module shown;

[0038] Figure 8 yes Figure 6The image shows some simulation results of the intermediate focal length of the zoom lens in the camera module shown.

[0039] Figure 9 yes Figure 6 Some simulation results of the telephoto end of the zoom lens in the camera module shown;

[0040] Figure 10 These are some other structural schematic diagrams of the camera module in the electronic device provided in the embodiments of this application;

[0041] Figure 11 yes Figure 10 Some simulation results of the wide-angle end of the zoom lens in the camera module shown;

[0042] Figure 12 yes Figure 10 The image shows some simulation results of the intermediate focal length of the zoom lens in the camera module shown.

[0043] Figure 13 yes Figure 10 Some simulation results of the telephoto end of the zoom lens in the camera module shown;

[0044] Figure 14 These are some further structural schematic diagrams of the camera module in the electronic device provided in the embodiments of this application;

[0045] Figure 15 yes Figure 14 Some simulation results of the wide-angle end of the zoom lens in the camera module shown;

[0046] Figure 16 yes Figure 14 The image shows some simulation results of the intermediate focal length of the zoom lens in the camera module shown.

[0047] Figure 17 yes Figure 14 Some simulation results of the telephoto end of the zoom lens in the camera module shown;

[0048] Figure 18 These are some further structural schematic diagrams of the camera module in the electronic device provided in the embodiments of this application;

[0049] Figure 19 yes Figure 18 Some simulation results of the wide-angle end of the zoom lens in the camera module shown;

[0050] Figure 20 yes Figure 18 The image shows some simulation results of the intermediate focal length of the zoom lens in the camera module shown.

[0051] Figure 21 yes Figure 18 Some simulation results of the telephoto end of the zoom lens in the camera module shown;

[0052] Figure 22 These are some further structural schematic diagrams of the camera module in the electronic device provided in the embodiments of this application;

[0053] Figure 23 yes Figure 22 Some simulation results of the wide-angle end of the zoom lens in the camera module shown;

[0054] Figure 24 yes Figure 22 The image shows some simulation results of the intermediate focal length of the zoom lens in the camera module shown.

[0055] Figure 25 yes Figure 22 The image shows some simulation results of the telephoto end of the zoom lens in the camera module. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0057] Lens: A component that uses the refraction of a lens to allow light beams from a scene to pass through the lens and form a clear image on the focal plane, such as the zoom lens provided in the embodiments of this application.

[0058] Optical power (focal power): equal to the difference between the image-side beam convergence and the object-side beam convergence, characterizing the ability of an optical system to deflect a beam. A lens or lens group with positive optical power has a positive focal length and converges the beam. A lens or lens group with negative optical power has a negative focal length and diverges the beam.

[0059] Object side: The side where the object is located is the object side, with the lens as the boundary. The surface of the lens that is close to the object side can be called the object side surface.

[0060] Image side: The side on which the image of the object is located, with the lens as the boundary, is called the image side. The surface of the lens closest to the image side can be called the image side surface.

[0061] Wide end: The shortest focal length of the lens, with the widest angle of view, used for shooting close-ups, especially large-scale close-ups. When shooting at the wide end, the lens can also be said to be in macro mode.

[0062] Intermediate focal length: The focal length between the wide-angle end and the telephoto end.

[0063] Telescopic end: The longest focal length of the lens, with the smallest angle of view, used for shooting distant scenes, especially close-ups. When shooting at the telescopic end, the lens is also said to be in a long-distance state.

[0064] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the distance from the optical center of a lens or lens group to the focal point when a distant object is projected into a sharp image on the focal plane. It can also be understood as the perpendicular distance from the optical center of the lens or lens group to the focal plane. From a practical perspective, it can be understood as the distance from the center of the lens to the image plane. For prime lenses, the position of their optical center remains fixed; for zoom lenses, changes in the optical center result in changes in the focal length.

[0065] The effective focal length (EFL) of a lens refers to the distance from the center of the lens to the focal point.

[0066] An aperture diaphragm is a device used to control the amount of light passing through the lens and entering the sensor inside the camera body; it is usually located inside the lens.

[0067] Aperture: This is a device used to control the amount of light passing through the lens and entering the camera's sensor. It is usually located inside the lens. Aperture size is expressed using an F-number (Fno).

[0068] Aperture F-number: equal to the lens focal length divided by the entrance pupil diameter. With the lens focal length constant, the larger the entrance pupil diameter, the larger the aperture, the smaller the aperture F-number, the more light enters, the brighter the image, and the greater the blurring of the subject and background; conversely, the smaller the entrance pupil diameter, the smaller the aperture, the larger the aperture F-number, the less light enters, the darker the image, and the sharper the subject and background.

[0069] Total track length (TTL): refers to the total length from the head of the lens barrel to the imaging plane, and is the main factor that determines the height of the camera.

[0070] The Abbe number, also known as the dispersion coefficient, is the ratio of the differences in the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material. Generally speaking, the higher the refractive index of the medium, the more severe the dispersion, and the smaller the Abbe number; conversely, the lower the refractive index of the medium, the less severe the dispersion, and the larger the Abbe number.

[0071] Axial spherical aberration, also known as longitudinal chromatic aberration or positional chromatic aberration, occurs when a beam of light parallel to the optical axis converges at different positions after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration because the lens images different wavelengths of light at different positions, causing the image-side focal planes of different colors of light to not coincide in the final image, resulting in the dispersion of polychromatic light.

[0072] Aberrations: The paraxial region of an optical system has the properties of an ideal optical system, where paraxial rays emitted from a point on an object intersect the image plane at a single point (i.e., the paraxial image point). However, in reality, light rays passing through different apertures of a lens rarely intersect perfectly at a single point, but rather deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0073] Astigmatism occurs because the object point is not on the optical axis of the optical system, and the emitted beam of light has an angle with the optical axis. After refraction by a lens, the convergence points of the meridional and sagittal beams are not at the same point. That is, the beam cannot be focused on a single point, resulting in an unclear image, hence astigmatism. The meridional and sagittal beams are the names of beams in two perpendicular planes within a rotationally symmetric optical system.

[0074] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0075] On-axis spherical aberration is the difference between the position of the actual image point and the ideal image point in the direction parallel to the optical axis.

[0076] To facilitate understanding of the zoom lens provided in the embodiments of this application, the application scenarios of the zoom lens provided in the embodiments of this application are described below.

[0077] The zoom lens provided in this application embodiment is applied to the camera module of an electronic device. The electronic device involved in this application embodiment may include handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. Examples include cellular phones, mobile phones, smartphones, tablets, laptops, camcorders, video recorders, cameras, smartwatches, smart wristbands, surveillance cameras, or other devices with photo or video recording functions. This application embodiment does not impose any special limitations on the specific type of electronic device.

[0078] Figure 1 This is a schematic structural diagram of an electronic device 100 provided in an embodiment of this application. Figure 1 (1) in the text represents the front of electronic device 100. Figure 1 (2) in the text represents the back of the electronic device 100. Figure 2 yes Figure 1 The diagram shows a partial structural view of the electronic device 100 cut along line A1-A2. For ease of explanation, the following description uses a mobile phone as an example. The electronic device 100 can be a foldable phone or a candybar phone; this application does not limit the type of phone.

[0079] like Figure 1 (1) and Figure 1 As shown in (2), the electronic device 100 may include a housing 10, a display screen 20, an image processor 30, and a camera module 40. The housing 10 may include a frame 110 and a back cover 120. The frame 110 and the back cover 120 may be integrally formed or assembled into a single unit. The display screen 20 and the back cover 120 are respectively mounted on both sides of the frame, jointly enclosing the internal cavity of the device. The image processor 30 and the camera module 40 are housed within the internal cavity of the device. Figure 2 As shown, the back cover 120 may be provided with a camera hole 130, through which the camera module 40 collects light. For example, the back cover 120 includes a light-transmitting lens 140, which is installed inside the camera hole 130 to allow light to pass through and to be dustproof and waterproof.

[0080] The image processor 30 can communicate with the camera module 40 to acquire and process image data from the camera module 40. The communication connection between the image processor 30 and the camera module 40 can include data transmission via electrical connections such as wiring, or via coupling. It is understood that the image processor 30 and the camera module 40 can also communicate using other methods capable of data transmission, and this application does not impose any limitations on this.

[0081] The image processor 30 is used to optimize the digital image signal and then transmit the optimized digital image signal to the display screen. The image processor 30 can be an image processing chip or a digital signal processing chip. Its function is to transmit the data obtained by the photosensitive chip to the central processing unit in a timely and fast manner and refresh the photosensitive chip. Therefore, the quality of the image processor 30 directly affects the image quality (such as color saturation, sharpness, etc.).

[0082] The camera module 40 is used to capture videos and / or photos, and can be used to capture scenes at different distances. For example, the camera module 40 can be used to capture distant scenes or close-up scenes (e.g., macro scenes). This application does not impose any special limitations on the embodiments.

[0083] The camera module 40 can be installed on the front or back of the electronic device 100, or it can be installed on both the front and back of the electronic device 100. For example... Figure 1 (1) in the diagram represents the front of the electronic device 100, on which a camera module 40 is mounted. This can be referred to as the front-facing camera module of the electronic device 100, which can be used for selfies or for the photographer to take pictures of other objects. It should be understood that the mounting position of the camera module 40 is merely illustrative. The number of camera modules 40 can be limited to one, and can be two or more. For example, the electronic device 100 can have two camera modules 40 mounted on the front and two camera modules 40 mounted on the back. This application embodiment does not limit the number of camera modules 40 that can be mounted. When multiple camera modules 40 are mounted, the multiple camera modules 40 can be the same or different. For example, the multiple camera modules 40 may have different numbers of lenses, different optical parameters of the lenses, or different lens placement positions, etc.

[0084] It should be understood that Figure 1 The electronic device 100 shown is not limited to the above-mentioned devices, but may also include other devices, such as batteries, flashlights, fingerprint recognition modules, earpieces, buttons, sensors, etc. This application embodiment only uses an electronic device 100 with a camera module 40 installed as an example for illustration, but the devices installed on the electronic device 100 are not limited to this.

[0085] In some embodiments, the electronic device 100 may further include an analog-to-digital converter (also known as an A / D converter). Figure 1 (Not shown in the image). An analog-to-digital converter (ADC) is connected between the camera module 40 and the image processor 30. The ADC converts the signal generated by the camera module 40 into a digital image signal and transmits it to the image processor 30. The image processor 30 then processes the digital image signal and finally displays the image or video on the display screen. In some examples, the ADC may also be integrated into the camera module 40 or the image processor 30.

[0086] In some embodiments, the electronic device 100 may further include a memory ( Figure 1 (Not shown in the image) The memory is connected to the image communication network. After processing the digital image signal, the image processor 30 transmits the image to the memory so that the image can be retrieved from the memory and displayed on the screen at any time when it is needed to view the image later. In some embodiments, the image processor 30 also compresses the processed digital image signal before storing it in the memory to save memory space.

[0087] In some embodiments, such as Figure 2 As shown, the camera module 40 may include a zoom lens 410 and a photosensitive element 420. The photosensitive element 420 is located on the image side of the zoom lens 410. The camera module 40 may also include a circuit board ( Figure 2 (Not shown in the image), the photosensitive element 420 can be fixed to this circuit board. (Beam) Figure 2 The dotted line (in the image) can pass through the zoom lens 410 and illuminate the photosensitive surface of the photosensitive element 420. For example, the working principle of the camera module 40 can be as follows: the light beam reflected from the subject passes through the zoom lens 410 to generate an optical image, which is then projected onto the photosensitive surface of the photosensitive element 420. The photosensitive element 420 converts the optical image into an electrical signal, i.e., an analog image signal, and transmits it to an analog-to-digital converter (ADC) to convert it into a digital image signal for the image processor 30.

[0088] A photosensitive element 420 (also known as an image sensor) is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When illuminated, these photodiodes generate electrical charges. The photosensitive element 420 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. CCDs are made using a highly sensitive semiconductor material that converts light beams into electrical charges. CCDs consist of many photosensitive units, typically measured in megapixels. When a light beam illuminates the surface of a CCD, each photosensitive unit reflects a charge onto the component. The signals generated by all the photosensitive units are added together to form a complete image. CMOS devices primarily utilize semiconductors made of silicon and germanium, allowing N-type (negative) and P-type (positive) semiconductors to coexist on the CMOS. The current generated by these complementary effects can be recorded and interpreted by the processing chip as an image.

[0089] The zoom lens 410 affects image quality and imaging effect. It primarily utilizes the refraction principle of lenses for imaging; that is, light from the scene passes through the zoom lens 410, forming a clear image on the focal plane, which is then recorded by the photosensitive element 420 located on the focal plane. The zoom lens 410 can be a vertical lens or a periscope lens; this embodiment describes it as a periscope lens. When the zoom lens 410 is a periscope lens, it is better suited for use in thin electronic devices 100.

[0090] In zoom lenses, the first lens group is used to change the focusing position of light, thereby achieving zoom functionality. Because the first lens group contains a large number of lenses, has a large lens volume, and is mostly made of glass, its cost largely determines the total cost of the zoom lens, making it difficult to achieve low cost and lightweight design. As users' requirements for camera module shooting scenarios become increasingly diverse, the market demand for camera modules that can handle multiple shooting scenarios (such as night shooting, long-distance shooting, and macro shooting) is growing. This has led to a continuous increase in the number of first lens groups, resulting in a sustained rise in the cost and weight of both the first lens group and the zoom lens, severely impacting the usability of zoom lenses.

[0091] Taking industrial sensing cameras as an example, these cameras need to meet the requirements of various shooting scenarios, including nighttime shooting, long-distance shooting, macro shooting, and dynamic image shooting. Industrial sensing cameras typically use zoom lenses, freely adjusting the field of view based on the installation location or the position of the image to be captured, with high requirements for the wide-angle end of the field of view. For example, industrial sensing cameras may need to be able to track moving objects even when no one is watching the image, using motion detection or human body sensors to magnify and capture images of car license plates or people, thereby identifying the object. Furthermore, in nighttime shooting scenarios, zoom lenses typically require a large aperture, the ability to capture near-infrared light, and a wide wavelength range for photography. As the above analysis shows, industrial sensing cameras need to accommodate multiple shooting scenarios, resulting in a large number of lens groups, leading to higher weight and cost of the zoom lens.

[0092] Typically, low-cost, lightweight plastics are used to replace some glass lenses to achieve low cost and lightweight zoom lenses. However, the refractive index of plastic lenses is prone to change when the temperature changes, which can lead to unstable focusing performance of the first lens group at different temperatures, thus affecting the image quality of the zoom lens. In addition, due to the high coefficient of linear expansion of plastic lenses, they are prone to deformation when the temperature changes (for example, plastic lenses are prone to expansion or contraction when the temperature changes), and the first lens group is prone to deformation. This can also lead to unstable focusing performance of the first lens group at different temperatures, further affecting the image quality of the zoom lens.

[0093] Furthermore, chromatic aberration significantly impacts the image quality of zoom lenses. Typically, expensive achromatic lenses with low dispersion are incorporated into zoom lenses to correct chromatic aberration during shooting and improve image quality. This is especially true at the telephoto end, where chromatic aberration is amplified, necessitating the inclusion of an expensive achromatic lens with low dispersion within the first lens group. Therefore, correcting the chromatic aberration of the first lens group and improving its focusing performance are crucial for enhancing the overall image quality of the zoom lens.

[0094] Figure 3 This is a schematic structural diagram of the first lens group G1 of a zoom lens 410 provided in an embodiment of this application.

[0095] like Figure 3As shown, the zoom lens 410 includes a first lens group G1 disposed near the object side, the first lens group G1 including a first lens L3; the first lens L3 is made of a first polymer compound material (e.g., the first polymer compound material can be plastic, resin, etc.); the first lens group G1 also includes a second lens L4, the second lens L4 is made of a second polymer compound material (e.g., the second polymer compound material can be plastic, resin, etc.), and the second lens L4 has a refractive power opposite to that of the first lens L3. Figure 3 In the image, the first lens L3 has negative refractive power and the second lens L4 has positive refractive power. Figure 3 The first and second lenses in the example are only one example; it can also be set up so that the first lens L3 has positive refractive power and the second lens L4 has negative refractive power.

[0096] In the first lens group G1 of the zoom lens 410, a first lens L3 and a second lens L4 with opposite refractive force directions are provided. The first lens L3 and the second lens L4 will produce opposite refractive effects on the light entering the first lens group G1 from the object side, thereby canceling each other out at least part of the refractive effect. Since the first lens L3 is made of a first polymer compound material and the second lens L4 is made of a second polymer compound material, when the temperature changes, the refractive index of the first lens L3 and the second lens L4 changes in the same trend, and the linear expansion coefficient of the first lens L3 and the second lens L4 changes in the same trend. The refractive cancellation effect between the first lens L3 and the second lens L4 is always better. In this way, the refractive effect of the first lens group G1 can be significantly reduced due to temperature changes. The first lens group G1 has stable focusing performance at different temperatures, and the zoom lens 410 has better aberration correction, which can significantly improve the imaging quality of the zoom lens 410. In addition, by replacing the glass lens with the first lens L3 made of the first polymer compound material and the second lens L4 made of the second polymer compound material, the cost of the zoom lens 410 can be reduced and the zoom lens 410 can be made lighter, so as to obtain an electronic device 100 that balances low cost, light weight and high imaging quality.

[0097] exist Figure 3In the zoom lens 410, the first lens L3 has negative refractive power and the second lens L4 has positive refractive power. The first lens L3 causes light to diverge, while the second lens L4 causes light to converge. As the operating temperature of the zoom lens 410 increases, the refractive indices of the first lens L3 and the second lens L4 decrease, resulting in a decrease in the absolute value of the refractive power of the first lens L3 and the second lens L4, while the coefficients of linear expansion of the first lens L3 and the second lens L4 increase, making them prone to expansion. Conversely, as the operating temperature of the zoom lens 410 decreases, the refractive indices of the first lens L3 and the second lens L4 increase, leading to a decrease in the linear expansion coefficients of the first lens L3 and the second lens L4. The absolute values ​​of the refractive power of lens L3 and the refractive power of lens L4 are enhanced, while the coefficients of linear expansion of lens L3 and lens L4 are reduced, causing lens L3 and lens L4 to easily shrink. Thus, the refractive indices of lens L3 and lens L4 change in the same direction, and the coefficients of linear expansion of lens L3 and lens L4 change in the same direction. The cancellation effect between lens L3 and lens L4 is always better, resulting in a zoom lens 410 that balances low cost, lightweight design, and superior image quality, and an electronic device 100 that balances low cost, lightweight design, and superior image quality.

[0098] In some embodiments, reference is made to Figure 4 and Figure 5 The first lens group G1 includes a first lens L3, a second lens L4, a third lens L3(*), and a fourth lens L4(*). The third lens L3(*) has a refractive power opposite to that of the fourth lens L4(*). The third lens L3(*) is made of a third polymer compound material, and the fourth lens L4(*) is made of a fourth polymer compound material. When the temperature changes, the refractive indices of the third lens L3(*) and the fourth lens L4(*) change in the same direction, and their coefficients of linear expansion change in the same direction. The refractive cancellation effect between the third lens L3(*) and the fourth lens L4(*) is always superior. This further reduces the cost of the zoom lens 410 and achieves a lighter weight for the zoom lens 410. In some possible embodiments, the first lens group G1 may also include at least one set of lenses made of two polymer compound materials with opposite refractive power directions. For example, the first lens group G1 may also include a fourth lens and a fifth lens, with the fourth lens having a refractive power opposite to that of the fifth lens.

[0099] In some embodiments, reference is made to Figures 3 to 5 The positions of the first lens L3, the second lens L4, the third lens L3(*), and the fourth lens L4(*) within the first lens group G1 can be set according to actual needs; for example, in Figure 3In the first lens group G1, only the first lens L3 and the second lens L4 are included. A glass lens may not be provided between the first lens L3 and the second lens L4; however, at least one glass lens may be provided between the first lens L3 and the second lens L4. As another example, in... Figure 4 In the first lens group G1, there are a first lens L3, a second lens L4, a third lens L3(*), and a fourth lens L4(*), which can be arranged sequentially. Figure 5 In this configuration, the first lens L3, the third lens L3(*), the second lens L4, and the fourth lens L4(*) can be arranged sequentially. In other words, the positions of the first lens L3, the second lens L4, the third lens L3(*), and the fourth lens L4(*) within the first lens group G1 are not specifically limited.

[0100] In some embodiments, the first lens group G1 may further include at least one glass lens. In some possible implementations, refer again... Figures 3 to 5 The first lens group G1 also includes a lens L1, which is a glass lens, located closest to the object side of the first lens group G1. In this way, lens L1 ensures chromatic aberration correction when the image enters the zoom lens 410 from the object side, improving the zoom performance and image quality of the zoom lens 410. For example, in... Figures 3 to 5 In the first lens group G1, there are glass lenses L1, L2, and L5, with glass lens L1 located closest to the object side of the first lens group G1. It is easy to understand that... Figures 3 to 5 The specific number of glass lenses in the first lens group G1 is not limited.

[0101] In some embodiments, the first lens L3 has negative refractive power, the second lens L4 has positive refractive power, and the first lens group G1 satisfies the following relationship: 0.7 ≤ |f1 / f2| ≤ 2.3, where f1 represents the focal length of the first lens L3 and f2 represents the focal length of the second lens L4. For example, the value of |f1 / f2| can be 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, or 2.3.

[0102] The above formula defines the range of the absolute ratio of the focal length of the first lens L3 to the absolute ratio of the focal length of the second lens L4. Since the ratio of the focal lengths of the two lenses is inversely proportional to the ratio of their refractive intensities, the above formula can define the range of the ratio of the refractive intensities of the first lens L3 and the second lens L4. By controlling the absolute ratio of the focal lengths of the first lens L3 and the second lens L4 within the above range, the absolute difference between the refractive intensities of the first lens L3 and the second lens L4 is moderate. When the temperature changes, the changes in the refractive indices of the first lens L3 and the second lens L4 are close to or equal, and the changes in the (expansion / contraction) of the first lens L3 and the second lens L4 are close to or equal. The refractive cancellation effect between the first lens L3 and the second lens L4 is always superior, the first lens group G1 has a stable focusing effect at different temperatures, and the zoom lens 410 in the electronic device 100 has superior imaging quality.

[0103] Furthermore, this helps alleviate the problem of an excessively large absolute ratio between the focal lengths of the first lens L3 and the second lens L4. The absolute value of the positive refractive power of the second lens L4 is much greater than the absolute value of the negative refractive power of the first lens L3. The negative refractive power of the first lens L3 is insufficient to fully counteract the positive refractive power of the second lens L4. At high temperatures, the focal point of the zoom lens 410 may shift away from the first lens group G1 on the imaging plane. At low temperatures, the focal point of the zoom lens 410 may shift closer to the first lens group G1 on the imaging plane. In other words, under high and low temperature conditions, the focal point of the zoom lens 410 will shift in opposite directions, making it difficult for the first lens group G1 to focus. This results in poor image quality of the zoom lens 410 in the electronic device 100 (especially at the telephoto end, where the shallow depth of field makes the aforementioned poor focusing effect very likely to lead to a deterioration in the image quality of the zoom lens 410). This also helps to alleviate the problem of the ratio of the absolute values ​​of the focal lengths of the first lens L3 and the second lens L4 being too small. The absolute value of the positive refractive power of the second lens L4 is much smaller than the absolute value of the negative refractive power of the first lens L3. The positive refractive power of the second lens L4 is difficult to completely counteract the negative refractive power of the first lens L3. At high temperatures, the focal point of the zoom lens 410 may move towards the imaging surface closer to the first lens group G1. At low temperatures, the focal point of the zoom lens 410 may move away from the imaging surface from the first lens group G1. In other words, under high and low temperature conditions, the focal point of the zoom lens 410 will move in opposite directions, making it difficult for the first lens group G1 to focus. This results in poor image quality of the zoom lens 410 in the electronic device 100 (especially at the telephoto end, where the depth of field of the lens is shallow, the poor focusing effect mentioned above can easily lead to a deterioration in the image quality of the zoom lens 410).

[0104] In some embodiments, the first lens L3 is made of a first polymer compound material, and the second lens L4 is made of a second polymer compound material, with the first and second polymer compound materials being the same. Thus, when the temperature changes, the change in refractive index of the first lens L3 and the second lens L4 is equal, and the (expansion / contraction) changes of the first lens L3 and the second lens L4 are equal. The refractive cancellation effect between the first lens L3 and the second lens L4 is excellent, and the refractive effect of the first lens group G1 hardly changes with temperature. The first lens group G1 has stable focusing performance at different temperatures, and the zoom lens 410 has superior aberration correction, which can significantly improve the imaging quality of the zoom lens 410.

[0105] In some embodiments, the third lens L3(*) has negative refractive power, and the fourth lens L4(*) has positive refractive power. The first lens group G1 satisfies the following relationship: 0.7 ≤ |f3 / f4| ≤ 2.3, where f3 represents the focal length of the third lens L3(*) and f4 represents the focal length of the fourth lens L4(*). The effect produced by this relationship (0.7 ≤ |f3 / f4| ≤ 2.3) is similar to that produced by the above relationship (0.7 ≤ |f1 / f2| ≤ 2.3), and will not be repeated here. In some possible embodiments, the third lens L3(*) is made of a third polymer compound material, and the fourth lens L4(*) is made of a fourth polymer compound material. The third and fourth polymer compound materials are the same, for example, both the third and fourth polymer compound materials are plastics.

[0106] In some embodiments, the first lens L3 and the second lens L4 satisfy the following relationship: -30.0 ≤ dnd / dT ≤ -1.0; where dnd is the change in refractive index of the first lens L3 and the second lens L4, and dT is the temperature at which the refractive index of the first lens L3 and the second lens L4 changes. For example, the value of dnd / dT can be -30.0, -25.0, -20.0, -15.0, -10.0, -5.0, or -1.0, and the unit of dnd / dT is 10. -5 / ℃. Among them, dnd can be applied to the change of refractive index of the d-line (587.56nm) of the first lens L3 and the second lens L4. That is, the first lens L3 and the second lens L4 can meet the above relationship under the conditions of 20℃ and standard wavelength (587.56nm).

[0107] The above formula defines the range of the ratio of the refractive indices of the first lens L3 and the second lens L4 as a function of temperature, that is, it reflects the range of the ratio of the temperature coefficients of the refractive indices of the first lens L3 and the second lens L4. By controlling the ratio of the refractive indices of the first lens L3 and the second lens L4 as a function of temperature within the above range, the ratio of the refractive indices of the first lens L3 and the second lens L4 as a function of temperature is moderate, the refractive cancellation effect of the first lens L3 and the second lens L4 is better, the amount of change in the refractive power of the first lens group G1 with temperature is moderate, the first lens group G1 is easier to focus, the zoom lens 410 in the electronic device 100 has better image quality, and the first lens L3 and the second lens L4 are lighter and less expensive, making it easier to achieve lightweight and low-cost zoom lens 410.

[0108] Furthermore, it helps to mitigate the excessively large ratio of the refractive index changes of the first lens L3 and the second lens L4 with temperature, and the excessively large change in the refractive index of the first lens group G1 with temperature, which easily leads to poor focusing performance of the first lens group G1 and poor imaging quality of the zoom lens 410 in the electronic device 100. It also helps to mitigate the excessively small ratio of the refractive index changes of the first lens L3 and the second lens L4 with temperature, which would result in a larger mass and higher cost of the materials for the first lens L3 and the second lens L4.

[0109] In some embodiments, the third lens L3(*) and the fourth lens L4(*) satisfy the following relationship: -30.0 ≤ dnd / dT ≤ -1.0; where dnd is the change in refractive index of the third lens L3(*) and the fourth lens L4(*), dT is the temperature at which the refractive index of the third lens L3(*) and the fourth lens L4(*) changes, and the unit of dnd / dT is 10. -5 / ℃. Here, dnd applies to the variation of the refractive index of the d-line (587.56nm) of the third lens L3(*) and the fourth lens L4(*), meaning that the third lens L3(*) and the fourth lens L4(*) can satisfy the above relationship under the conditions of 20℃ and standard wavelength (587.56nm). The effect produced by the relationship corresponding to the third lens L3(*) and the fourth lens L4(*) is similar to the effect produced by the first lens L3 and the second lens L4, and will not be elaborated further here.

[0110] In some embodiments, the zoom lens 410 satisfies the following relationship: Where F1 represents the focal length of the first lens group G1, F w This represents the focal length of the 410 zoom lens at the wide-angle end, F. t This represents the focal length of the zoom lens 410 at the telephoto end.

[0111] The above formula defines the range of the ratio between the focal length of the first lens group G1 and the effective focal length of the zoom lens 410. By controlling the ratio of the focal length of the first lens group G1 to the effective focal length of the zoom lens 410 within the above range, the focal length of the first lens group G1 is moderate, which is beneficial for achieving a high zoom ratio and wide-angle at the wide end of the zoom lens 410.

[0112] Furthermore, it helps to alleviate the problem of an excessively large ratio between the focal length of the first lens group G1 and the effective focal length of the zoom lens 410, resulting in excessively low refractive power and weak optical focal length. This makes it difficult for light to be effectively focused when passing through the first lens group G1, which is not conducive to achieving a high zoom ratio for the zoom lens 410. It also helps to alleviate the problem of an excessively small ratio between the focal length of the first lens group G1 and the effective focal length of the zoom lens 410, resulting in excessively high refractive power and strong optical focal length. This causes light to converge prematurely, limiting the wide-angle capability of the zoom lens 410 at the wide-angle end.

[0113] In some embodiments, the camera module may further include a filter located between the zoom lens 410 and the photosensitive element 420. The filter is used to eliminate unwanted light projected onto the photosensitive element 420, preventing the photosensitive element 420 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. For example, the filter may be an infrared filter.

[0114] In some embodiments, the optical surfaces of the first lens L3 and / or the second lens L4 include aspherical surfaces. This is beneficial for correcting aberrations in the zoom lens 410, improving the resolution of the zoom lens 410, reducing the size of the zoom lens 410, and facilitating the miniaturization of the electronic device 100.

[0115] In some embodiments, the zoom lens 410 may further include a second lens group G2, which is a zoom lens group located on the side of the first lens group G1 away from the object side. In some possible embodiments, the refractive power of the second lens group G2 may be negative. In some embodiments, the zoom lens 410 may further include a third lens group L3(*), located on the side of the second lens group G2 away from the first lens group G1. In some possible embodiments, the refractive power of the third lens group L3(*) may be positive. In some embodiments, the zoom lens 410 may further include a fourth lens group L4(*), located on the side of the third lens group L3(*) away from the second lens group G2.

[0116] In some embodiments, the zoom lens 410 may further include an aperture stop STO, which may be located between the first lens group G1 and the second lens group G2; or, the aperture stop STO may be located between the second lens group G2 and the third lens group L3(*); or, the aperture stop STO may be located between the third lens group L3(*) and the fourth lens group L4(*), and this application does not limit this. For example, see reference... Figure 6 The aperture stop STO can be located between the second lens group G2 and the third lens group L3(*), which is beneficial to improving the imaging quality of the zoom lens 410.

[0117] The following will combine Figures 6 to 25 The present application provides some specific, but not limiting, examples of embodiments.

[0118] In Examples 1 to 5 below, the camera module includes a zoom lens and a photosensitive element 420. The zoom lens includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a cover glass (CG) L15, and a photosensitive element 420 (the surface of the photosensitive lens facing the first lens group G1 can be the imaging surface of a solid-state imaging element such as a CCD sensor or a CMOS sensor, or the film surface of a silver halide film). The aperture stop STO is disposed at the edge of the object-side surface of the third lens L3. The first lens group G1 is a fixed lens group with positive refractive power, the second lens group G2 is a zoom lens group with negative refractive power, the third lens group G3 is a fixed lens group with positive refractive power, and the fourth lens group G4 is a zoom lens group with positive refractive power.

[0119] The following is an explanation of some information from Tables 1a, 2a, 3a, 4a, and 5a:

[0120] In Tables 1a, 2a, 3a, 4a, and 5a, (1) the aspherical (*) in the lens number indicates that the mirror is an aspherical mirror, and the absence of (*) in the lens number indicates that the mirror is a spherical mirror. For example, S4 (*) and S5 (*) represent the two aspherical mirrors of plastic lens L3, and S8 and S9 represent the two spherical mirrors of glass lens L5, respectively; (2) Ln / Lm in the lens indicates that the corresponding mirror is an adhesive mirror. For example, L1 / L2 represents that the adhesive mirror corresponding to glass lens L1 and glass lens L2 is S2; (3) Ln / Lm in the lens indicates that the corresponding refractive index is L The refractive index of m, Ln / Lm in the lens represents the corresponding Abe number of Lm. For example, L1 / L2 in the lens represents the corresponding refractive index of L2 and the corresponding Abe number of L2; (4) The positive or negative value of the radius of curvature can indicate whether the optical surface of the lens is convex to the object side or the image side. A positive value of the radius of curvature indicates that the optical surface of the lens is convex to the object side near the optical axis, and a negative value indicates that the optical surface of the lens is convex to the image side near the optical axis; (5) The refractive index and Abe number of the lens are measured at a wavelength of 587.56 nm; (6) The units of radius of curvature and optical axis spacing are millimeters.

[0121] Example 1:

[0122] Table 1a is Figure 6 The zoom lens shown in the table displays the surface type, radius of curvature, optical axis spacing, refractive index, and Abbe number of each lens and filter used in focusing and imaging. In Tables 1a and 1b, lenses L3, L4, L13, and L14 are made of resin, while the remaining lenses are made of glass. Furthermore, D9, D14, D21, and D27 will change depending on the movement of the second lens group G2 and the fourth lens group G4; the specific values ​​for D9, D14, D21, and D27 can be found in Table 1c.

[0123] Table 1a

[0124]

[0125]

[0126] Table 1b shows the aspheric coefficients of each aspheric surface. The aspheric coefficients for aspheric surfaces not shown in Table 1b are all 0.00. These aspheric coefficients are obtained using the following formula 1:

[0127]

[0128] Where z is a point on the aspherical surface at a distance h from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis of the aspherical surface; c is the curvature. h is the perpendicular distance between a point on the aspherical curve and the optical axis; k is the conic coefficient; Ai is the i-th order aspherical coefficient. For example, Ai can be "A4", "A6", "A8", "A10", etc., which are aspherical coefficients of different orders.

[0129] Table 1b

[0130]

[0131] Table 1c indicates Figure 6 The zoom data for the wide-angle, intermediate, and telephoto ends of the zoom lens is shown in Table 1d. Figure 6 The specific parameters of the first lens group G1, second lens group G2, third lens group G3, and fourth lens group G4 of the zoom lens are shown. The structural length of the lens group refers to the distance along the optical axis from the starting surface to the ending surface of the lens group. The lens group movement refers to the amount (distance) that each lens group moves from its position on the optical axis at the wide-angle end to its position on the optical axis at the telephoto end; this movement is negative for movement towards the object side and positive for movement towards the image side. However, in the case of lens groups that do not move linearly from the wide-angle end to the telephoto end during zooming, as in the second lens group G2, but instead move along a trajectory convex towards the image side or the object side, this represents the difference (distance) between the position of each lens group on the optical axis at the wide-angle end and its position on the optical axis at the telephoto end.

[0132] Table 1c

[0133] Wide-angle end intermediate focal length Observation Depth Focal length (EFL) (mm) 5.504 20.012 128.723 Aperture Fno (F-stop) 1.665 2.702 4.566 Half field of view W (°) 32.816 9.340 1.432 Total lens length (TTL, mm) 92.000 92.000 92.000 D9(mm) 0.500 15.770 27.148 D14 (mm) 28.552 13.282 1.904 D21(mm) 7.479 2.837 15.724 D27(mm) 10.845 15.487 2.600

[0134] Table 1d

[0135]

[0136] In Example 1, under the condition of 20℃, (1) the focal length f1 of the first lens L3 is -147.72, the focal length f2 of the second lens is 147.73, and the ratio of the focal lengths of the first lens L3 and the second lens L4, |f1 / f2|, is close to 1; (2) the change in refractive index of the first lens and the second lens satisfies dnd / dT = -9.60; (3) F1 represents the focal length of the first lens group, Fw represents the focal length of the zoom lens at the wide-angle end, and Ft represents the focal length of the zoom lens at the telephoto end. F1 is 42.57, Fw is 5.50, and Ft is 128.72. It is 1.60.

[0137] Figure 7 , Figure 8 , Figure 9 A simulation diagram of a zoom lens designed using the method described in Example 1 is shown, in which... Figure 7(1) is a spherical aberration curve of a zoom lens at the wide-angle end, with the vertical axis representing the F-number (Fno). Figure 7 (2) is the astigmatism curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W). Figure 7 (3) is the distortion aberration curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W); Figure 8 (1) is a spherical aberration curve of a zoom lens at the intermediate focal length, with the vertical axis representing the F-number (Fno). Figure 8 (2) is the astigmatism curve of the zoom lens at the intermediate focal length, with the vertical axis representing the half field of view (W). Figure 8 (3) is a distortion aberration curve of a zoom lens at the middle focal length, with the vertical axis representing the half field of view (W); Figure 9 (1) is a spherical aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the F-number (Fno). Figure 9 (2) is the astigmatism curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W). Figure 9 (3) is a distortion aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W).

[0138] refer to Figure 7 In (1), the spherical aberration Fno = 1.665; Reference Figure 7 In (2), the astigmatism W = 32.816; Reference Figure 7 In (3), the distortion W = 32.816. (Reference) Figure 8 In (1), the spherical aberration Fno = 2.702; Reference Figure 8 In (2), the astigmatism W = 9.340; Reference Figure 8 In (3), the distortion W = 9.340. (Reference) Figure 9 In (1), the spherical difference Fno = 4.566; Reference Figure 9 In (2), the astigmatism W = 1.432; Reference Figure 9 In (3), the distortion W = 1.432. As can be seen from the above, the zoom lens of Example 1 has excellent imaging quality at the wide-angle end, intermediate focal length, and telephoto end, and the first lens group of the zoom lens is equipped with at least two plastic lenses, which can achieve low cost and lightweight.

[0139] Example 2:

[0140] Table 2a is Figure 10The zoom lens shown in Tables 2a and 2b displays the surface type, radius of curvature, optical axis spacing, refractive index (Nd), and Abbe number of each lens and filter used in focusing and imaging. In Tables 2a and 2b, lenses L3, L4, L9, L11, L13, and L14 are made of resin, while the remaining lenses are made of glass. Furthermore, D9, D14, D21, and D27 will change depending on the movement of the second lens group G2 and the fourth lens group G4; the specific values ​​for D9, D14, D21, and D27 can be found in Table 2c.

[0141] Table 2a

[0142]

[0143]

[0144] Table 2b shows the aspheric coefficients of each aspheric surface. The aspheric coefficients of aspheric surfaces not shown in Table 2b are all 0.00.

[0145] Table 2b

[0146]

[0147] Table 2c indicates Figure 10 The zoom data for the wide-angle, intermediate, and telephoto ends of the zoom lens is shown in Table 2d. Figure 10 The specific parameters of the first lens group G1, second lens group G2, third lens group G3, and fourth lens group G4 of the zoom lens are shown. The structural length of the lens group refers to the distance along the optical axis from the starting surface to the ending surface of the lens group. The lens group movement refers to the amount (distance) that each lens group moves from its position on the optical axis at the wide-angle end to its position on the optical axis at the telephoto end; this movement is negative for movement towards the object side and positive for movement towards the image side. However, in the case of lens groups that do not move linearly from the wide-angle end to the telephoto end during zooming, as in the second lens group G2, but instead move along a trajectory convex towards the image side or the object side, this represents the difference (distance) between the position of each lens group on the optical axis at the wide-angle end and its position on the optical axis at the telephoto end.

[0148] Table 2c

[0149] Wide-angle end intermediate focal length Observation Depth Focal length (EFL) (mm) 5.506 26.601 128.854 Aperture Fno (F-stop) 1.681 3.816 4.550 Half field of view W (°) 32.806 7.049 1.435 Total lens length (TTL, mm) 92.000 92.000 92.000 D9(mm) 0.500 18.788 27.914 D14 (mm) 29.302 11.014 1.888 D21(mm) 7.008 2.014 16.051 D27(mm) 11.630 16.624 2.587

[0150] Table 2d

[0151]

[0152] In Example 2, under the condition of 20℃, (1) the focal length f1 of the first lens L3 is -169.62, the focal length f2 of the second lens is 169.63, and the ratio of the focal lengths of the first lens L3 and the second lens L4, |f1 / f2|, is close to 1; (2) the change in refractive index of the first lens and the second lens satisfies dnd / dT = -9.60; (3) F1 represents the focal length of the first lens group, Fw represents the focal length of the zoom lens at the wide-angle end, and Ft represents the focal length of the zoom lens at the telephoto end. F1 is 43.01, Fw is 5.51, and Ft is 128.85. It is 1.61.

[0153] Figure 11 , Figure 12 , Figure 13 A simulation diagram of a zoom lens designed using the method described in Example 2 is shown, in which... Figure 11 (1) is a spherical aberration curve of a zoom lens at the wide-angle end, with the vertical axis representing the F-number (Fno). Figure 11 (2) is the astigmatism curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W). Figure 11 (3) is the distortion aberration curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W); Figure 12 (1) is a spherical aberration curve of a zoom lens at the intermediate focal length, with the vertical axis representing the F-number (Fno). Figure 12 (2) is the astigmatism curve of the zoom lens at the intermediate focal length, with the vertical axis representing the half field of view (W). Figure 12 (3) is a distortion aberration curve of a zoom lens at the middle focal length, with the vertical axis representing the half field of view (W); Figure 13 (1) is a spherical aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the F-number (Fno). Figure 13 (2) is the astigmatism curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W). Figure 13 (3) is a distortion aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W).

[0154] refer to Figure 11 In (1), the spherical difference Fno = 1.681; Reference Figure 11 In (2), the astigmatism W = 32.806; Reference Figure 11 In (3), the distortion W = 32.806. (Reference) Figure 12 In (1), the spherical difference Fno = 3.816; Reference Figure 12 In (2), the astigmatism W = 7.049; Reference Figure 12 In (3), the distortion W = 7.049. (Reference) Figure 13 In (1), the spherical difference Fno = 4.550; Reference Figure 13 In (2), the astigmatism W = 1.435; Reference Figure 13 In (3), the distortion W = 1.435. As can be seen from the above, the zoom lens of Example 2 has excellent imaging quality at the wide-angle end, intermediate focal length, and telephoto end, and the first lens group of the zoom lens is equipped with at least two plastic lenses, which can achieve low cost and lightweight.

[0155] Example 3:

[0156] Table 3a is Figure 14 The zoom lens shown in Tables 3a and 3b displays the surface type, radius of curvature, optical axis spacing, refractive index (Nd), and Abbe number of each lens and filter used in focusing and imaging. In Tables 3a and 3b, lenses L3, L4, L9, L11, L13, and L14 are made of resin, while the remaining lenses are made of glass. Furthermore, D9, D15, D22, and D28 will change depending on the movement of the second lens group G2 and the fourth lens group G4; the specific values ​​for D9, D15, D22, and D28 can be found in Table 3c.

[0157] Table 3a

[0158]

[0159]

[0160] Table 3b shows the aspheric coefficients of each aspheric surface. The aspheric coefficients of aspheric surfaces not shown in Table 3b are all 0.00.

[0161] Table 3b

[0162]

[0163] Table 3c indicates Figure 14 The zoom data for the wide-angle, intermediate, and telephoto ends of the zoom lens is shown in Table 3d. Figure 14 The specific parameters of the first lens group G1, second lens group G2, third lens group G3, and fourth lens group G4 of the zoom lens are shown. The structural length of the lens group refers to the distance along the optical axis from the starting surface to the ending surface of the lens group. The lens group movement refers to the amount (distance) that each lens group moves from its position on the optical axis at the wide-angle end to its position on the optical axis at the telephoto end; this movement is negative for movement towards the object side and positive for movement towards the image side. However, in the case of lens groups that do not move linearly from the wide-angle end to the telephoto end during zooming, as in the second lens group G2, but instead move along a trajectory convex towards the image side or the object side, this represents the difference (distance) between the position of each lens group on the optical axis at the wide-angle end and its position on the optical axis at the telephoto end.

[0164] Table 3c

[0165]

[0166] Table 3d

[0167]

[0168] In Example 3, under the condition of 20℃, (1) the focal length f1 of the first lens L3 is -174.52, the focal length f2 of the second lens is 169.72, and the ratio of the focal lengths of the first lens L3 and the second lens L4, |f1 / f2|, is close to 1.03; (2) the change in refractive index of the first lens and the second lens satisfies dnd / dT = -9.60; (3) F1 represents the focal length of the first lens group, Fw represents the focal length of the zoom lens at the wide-angle end, and Ft represents the focal length of the zoom lens at the telephoto end. F1 is 44.61, Fw is 5.51, and Ft is 129.91. It is 1.67.

[0169] Figure 15 , Figure 16 , Figure 17 A simulation diagram of a zoom lens designed using the method described in Example 3 is shown, in which... Figure 15 (1) is a spherical aberration curve of a zoom lens at the wide-angle end, with the vertical axis representing the F-number (Fno). Figure 15 (2) is the astigmatism curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W). Figure 15 (3) is the distortion aberration curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W); Figure 16 (1) is a spherical aberration curve of a zoom lens at the intermediate focal length, with the vertical axis representing the F-number (Fno). Figure 16 (2) is the astigmatism curve of the zoom lens at the intermediate focal length, with the vertical axis representing the half field of view (W). Figure 16 (3) is a distortion aberration curve of a zoom lens at the middle focal length, with the vertical axis representing the half field of view (W); Figure 17 (1) is a spherical aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the F-number (Fno). Figure 17 (2) is the astigmatism curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W). Figure 17 (3) is a distortion aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W).

[0170] refer to Figure 15 In (1), the spherical aberration Fno = 1.671; Reference Figure 15In (2), the astigmatism W = 32.812; Reference Figure 15 In (3), the distortion W = 32.812. (Reference) Figure 16 In (1), the spherical difference Fno = 3.832; Reference Figure 16 In (2), the astigmatism W = 7.013; Reference Figure 16 In (3), the distortion W = 7.013. (Reference) Figure 17 In (1), the spherical aberration Fno = 4.590; Reference Figure 17 In (2), the astigmatism W = 1.428; Reference Figure 17 In (3), the distortion W = 1.428. As can be seen from the above, the zoom lens of Example 3 has excellent imaging quality at the wide-angle end, intermediate focal length, and telephoto end, and the first lens group of the zoom lens is equipped with at least two plastic lenses, which can achieve low cost and lightweight.

[0171] Example 4:

[0172] Table 4a is Figure 18 The zoom lens shown in the table displays the surface type, radius of curvature, optical axis spacing, refractive index (Nd), and Abbe number of each lens and filter used in focusing and imaging. In Tables 4a and 4b, lenses L3, L4, L9, L11, L12, and L13 are made of resin, while the remaining lenses are made of glass. Furthermore, D9, D15, D22, and D28 will change depending on the movement of the second lens group G2 and the fourth lens group G4; the specific values ​​for D9, D15, D22, and D28 can be found in Table 4c.

[0173] Table 4a

[0174]

[0175]

[0176] Table 4b shows the aspheric coefficients of each aspheric surface. The aspheric coefficients of aspheric surfaces not shown in Table 4b are all 0.00.

[0177] Table 4b

[0178]

[0179] Table 4c indicates Figure 18 The zoom data for the wide-angle, intermediate, and telephoto ends of the zoom lens is shown in Table 4d. Figure 18The specific parameters of the first lens group G1, second lens group G2, third lens group G3, and fourth lens group G4 of the zoom lens are shown. The structural length of the lens group refers to the distance along the optical axis from the starting surface to the ending surface of the lens group. The lens group movement refers to the amount (distance) that each lens group moves from its position on the optical axis at the wide-angle end to its position on the optical axis at the telephoto end; this movement is negative for movement towards the object side and positive for movement towards the image side. However, in the case of lens groups that do not move linearly from the wide-angle end to the telephoto end during zooming, as in the second lens group G2, but instead move along a trajectory convex towards the image side or the object side, this represents the difference (distance) between the position of each lens group on the optical axis at the wide-angle end and its position on the optical axis at the telephoto end.

[0180] Table 4c

[0181]

[0182] Table 4d

[0183]

[0184] In Example 4, under the condition of 20℃, (1) the focal length f1 of the first lens L3 is -233.14, the focal length f2 of the second lens is 116.72, and the ratio of the focal lengths of the first lens L3 and the second lens L4, |f1 / f2|, is close to 2.00; (2) the change in refractive index of the first lens and the second lens satisfies the condition that dnd / dT is -1.00; (3) F1 represents the focal length of the first lens group, Fw represents the focal length of the zoom lens at the wide-angle end, and Ft represents the focal length of the zoom lens at the telephoto end. F1 is 42.86, Fw is 14.00, and Ft is 129.96. It is 1.00.

[0185] Figure 19 , Figure 20 , Figure 21 A simulation diagram of a zoom lens designed using the method described in Example 2 is shown, in which... Figure 19 (1) is a spherical aberration curve of a zoom lens at the wide-angle end, with the vertical axis representing the F-number (Fno). Figure 19 (2) is the astigmatism curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W). Figure 19 (3) is the distortion aberration curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W); Figure 20 (1) is a spherical aberration curve of a zoom lens at the intermediate focal length, with the vertical axis representing the F-number (Fno). Figure 20 (2) is the astigmatism curve of the zoom lens at the intermediate focal length, with the vertical axis representing the half field of view (W). Figure 20 (3) is a distortion aberration curve of a zoom lens at the middle focal length, with the vertical axis representing the half field of view (W); Figure 21 (1) is a spherical aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the F-number (Fno). Figure 21 (2) is the astigmatism curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W). Figure 21 (3) is a distortion aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W).

[0186] refer to Figure 19 In (1), the spherical aberration Fno = 1.867; Reference Figure 19 In (2), the astigmatism W = 14.057; Reference Figure 19 In (3), the distortion W = 14.057. (Reference) Figure 20 In (1), the spherical difference Fno = 2.389; Reference Figure 20 In (2), the astigmatism W = 4.492; Reference Figure 20 In (3), the distortion W = 4.492. (Reference) Figure 21 In (1), the spherical difference Fno = 4.608; Reference Figure 21 In (2), the astigmatism W = 1.425; Reference Figure 21 In (3), the distortion W = 1.425. As can be seen from the above, the zoom lens of Example 4 has excellent imaging quality at the wide-angle end, intermediate focal length, and telephoto end, and the first lens group of the zoom lens is equipped with at least two plastic lenses, which can achieve low cost and lightweight.

[0187] Example 5:

[0188] Table 5a is Figure 22 The zoom lens shown in the table displays the surface type, radius of curvature, optical axis spacing, refractive index (Nd), and Abbe number of each lens and filter used in focusing and imaging. In Tables 5a and 5b, lenses L3, L4, L9, L11, L12, and L13 are made of resin, while the remaining lenses are made of glass. Furthermore, D9, D15, D22, and D28 will change depending on the movement of the second lens group G2 and the fourth lens group G4; the specific values ​​for D9, D15, D22, and D28 can be found in Table 5c.

[0189] Table 5a

[0190]

[0191]

[0192] Table 5b shows the aspheric coefficients of each aspheric surface. The aspheric coefficients of aspheric surfaces not shown in Table 5b are all 0.00.

[0193] Table 5b

[0194]

[0195] Table 5c indicates Figure 22 The zoom data for the wide-angle, intermediate, and telephoto ends of the zoom lens is shown in Table 5d. Figure 22 The specific parameters of the first lens group G1, second lens group G2, third lens group G3, and fourth lens group G4 of the zoom lens are shown. The structural length of the lens group refers to the distance along the optical axis from the starting surface to the ending surface of the lens group. The lens group movement refers to the amount (distance) that each lens group moves from its position on the optical axis at the wide-angle end to its position on the optical axis at the telephoto end; this movement is negative for movement towards the object side and positive for movement towards the image side. However, in the case of lens groups that do not move linearly from the wide-angle end to the telephoto end during zooming, as in the second lens group G2, but instead move along a trajectory convex towards the image side or the object side, this represents the difference (distance) between the position of each lens group on the optical axis at the wide-angle end and its position on the optical axis at the telephoto end.

[0196] Table 5c

[0197]

[0198] Table 5d

[0199]

[0200] In Example 5, under the condition of 20℃, (1) the focal length f1 of the first lens L3 is -161.04, the focal length f2 of the second lens is 213.47, and the ratio of the focal lengths of the first lens L3 and the second lens L4, |f1 / f2|, is close to 0.75; (2) the change in refractive index of the first lens and the second lens satisfies dnd / dT = -30.00; (3) F1 represents the focal length of the first lens group, Fw represents the focal length of the zoom lens at the wide-angle end, and Ft represents the focal length of the zoom lens at the telephoto end. F1 is 48.47, Fw is 5.54, and Ft is 20.01. It is 4.60.

[0201] Figure 23 , Figure 24 , Figure 25 A simulation diagram of a zoom lens designed using the method described in Example 2 is shown, in which... Figure 23 (1) is a spherical aberration curve of a zoom lens at the wide-angle end, with the vertical axis representing the F-number (Fno). Figure 23(2) is the astigmatism curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W). Figure 23 (3) is the distortion aberration curve of the zoom lens at the wide-angle end, with the vertical axis representing the half field of view (W); Figure 24 (1) is a spherical aberration curve of a zoom lens at the intermediate focal length, with the vertical axis representing the F-number (Fno). Figure 24 (2) is the astigmatism curve of the zoom lens at the intermediate focal length, with the vertical axis representing the half field of view (W). Figure 24 (3) is a distortion aberration curve of a zoom lens at the middle focal length, with the vertical axis representing the half field of view (W); Figure 25 (1) is a spherical aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the F-number (Fno). Figure 25 (2) is the astigmatism curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W). Figure 25 (3) is a distortion aberration curve of the zoom lens at the telephoto end, with the vertical axis representing the half field of view (W).

[0202] refer to Figure 23 In (1), the spherical difference Fno = 1.669; Reference Figure 23 In (2), the astigmatism W = 32.835; Reference Figure 23 In (3), the distortion W = 32.835. (Reference) Figure 24 In (1), the spherical difference Fno = 2.629; Reference Figure 24 In (2), the astigmatism W = 17.427; Reference Figure 24 In (3), the distortion W = 17.427. (Reference) Figure 25 In (1), the spherical difference Fno = 2.858; Reference Figure 25 In (2), the astigmatism W = 9.282; Reference Figure 25 In (3), the distortion W = 9.282. As can be seen from the above, the zoom lens of Example 5 has excellent imaging quality at the wide-angle end, intermediate focal length, and telephoto end, and the first lens group of the zoom lens is equipped with at least two plastic lenses, which can achieve low cost and lightweight.

[0203] This application embodiment also provides an electronic device, which includes an image processor and a camera module. The image processor and the camera module are communicatively connected. The camera module includes... Figures 3 to 25 Any zoom lens involved. For a detailed description, please refer to... Figure 1 and Figure 2 The description will not be repeated here.

[0204] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. An electronic device, characterized in that, include: An image processor and a camera module, wherein the image processor and the camera module are communicatively connected; The camera module includes a zoom lens, and the zoom lens includes a first lens group disposed near the object side, the first lens group including a first lens; the first lens is made of a first polymer compound material. The first lens group further includes a second lens, which is made of a second polymer compound material and has a refractive force opposite to that of the first lens.

2. The electronic device according to claim 1, characterized in that, The first lens has negative refractive power, the second lens has positive refractive power, and the first lens group satisfies the following relationship: 0.7 ≤ |f1 / f2| ≤ 2.3; Where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.

3. The electronic device according to claim 1 or 2, characterized in that, The first lens and the second lens satisfy the following relationship: -30.0≤dnd / dT≤-1.0; Where dnd is the change in refractive index of the first lens and the second lens, dT is the temperature at which the refractive index of the first lens and the second lens changes, and the unit of dnd / dT is 10. -5 / ℃.

4. The electronic device according to any one of claims 1-3, characterized in that, The first polymer compound material is the same as the second polymer compound material.

5. The electronic device according to any one of claims 1-4, characterized in that, The zoom lens satisfies the following relationship: Where F1 represents the focal length of the first lens group, F w F represents the focal length of the zoom lens at the wide-angle end. t This represents the focal length of the zoom lens at the telephoto end.

6. The electronic device according to any one of claims 1-5, characterized in that, The first lens group further includes a third lens and a fourth lens; the third lens has a refractive force opposite to that of the fourth lens; the third lens is made of a third polymer compound material, and the fourth lens is made of a fourth polymer compound material.

7. The electronic device according to any one of claims 1-6, characterized in that, The first lens group also includes at least one glass lens.

8. The electronic device according to any one of claims 1-7, characterized in that, The zoom lens includes a second lens group, which is the zoom lens group, and the second lens group is located on the side of the first lens group away from the object side.

9. The electronic device according to any one of claims 1-8, characterized in that, The optical surface of the first lens and / or the optical surface of the second lens includes aspherical surfaces.

10. A zoom lens, characterized in that, include: A first lens group is disposed near the object side, the first lens group including a first lens; the first lens is made of a first polymer compound material; The first lens group further includes a second lens, which is made of a second polymer compound material and has a refractive force opposite to that of the first lens.

11. The zoom lens according to claim 10, characterized in that, The first lens has negative refractive power, the second lens has positive refractive power, and the first lens group satisfies the following relationship: 0.7 ≤ |f1 / f2| ≤ 2.3; Where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.

12. The zoom lens according to claim 10 or 11, characterized in that, The first lens and the second lens satisfy the following relationship: -30.0≤dnd / dT≤-1.0; Where dnd is the change in refractive index of the first lens and the second lens, dT is the temperature at which the refractive index of the first lens and the second lens changes, and the unit of dnd / dT is 10. -5 / ℃.

13. The zoom lens according to any one of claims 10-12, characterized in that, The first polymer compound material is the same as the second polymer compound material.

14. The zoom lens according to any one of claims 10-13, characterized in that, The zoom lens satisfies the following relationship: Where F1 represents the focal length of the first lens group, F w F represents the focal length of the zoom lens at the wide-angle end. t This represents the focal length of the zoom lens at the telephoto end.

15. The zoom lens according to any one of claims 10-14, characterized in that, The first lens group further includes a third lens and a fourth lens; the third lens has a refractive force opposite to that of the fourth lens; the third lens is made of a third polymer compound material, and the fourth lens is made of a fourth polymer compound material.

16. A camera module, characterized in that, include: A photosensitive element and a zoom lens according to any one of claims 10 to 15, wherein the photosensitive element is located on the image side of the zoom lens.

Images