Camera module, control method thereof and electronic device

Abstract

The application provides a camera module, a control method thereof and an electronic device. The camera module comprises: a photosensitive component; a lens assembly arranged on a photosensitive path of the photosensitive component; and a filter assembly comprising a first filter element, a second filter element and at least one driver. The at least one driver selectively drives the first filter element or the second filter element to move to the photosensitive path of the photosensitive component. The filter assembly is arranged between the photosensitive component and the lens assembly. The technical solution of the application solves the problem of the difference in optical performance between the close focus and the far focus of the camera module.

Description

Technical Field

[0001] This application relates to the field of optoelectronic technology, specifically to a camera module, its control method, and an electronic device. Background Technology

[0002] With the popularization of mobile electronic devices, the technology of camera modules used in mobile electronic devices to help users acquire images (such as videos or pictures) has developed and progressed rapidly. In recent years, camera modules have been widely used in many fields such as medical care, security, and industrial production.

[0003] Field curvature is a crucial indicator for evaluating the performance of a camera module. Also known as image plane field curvature, it characterizes the consistency between the sharp position of each field of view and the sharp position of the central field of view. In existing technologies, due to optical design limitations, the closer to the out-of-focus field of view, the higher the requirements for lens deflection. Since the center is not affected by the original near-focus, this leads to a deviation between the out-of-focus field of view and the center, resulting in field curvature. Lens imaging can be understood as follows: the entire lens is divided into several groups. For the first group, the corresponding object forms an intermediate image that becomes the object of the second group, and so on, thus forming the final image on the final image plane. It can be seen that the position and image quality of the intermediate image in the penultimate group directly determine the final image plane representation.

[0004] When the object distance changes, the conventional focusing method moves the image plane to achieve focus at the new object distance. In this method, the spacing between the lenses remains unchanged. The center image of the penultimate group, which is the object in the last group, is unlikely to provide the optimal object state for the final image in terms of position and image quality. This manifests when the object distance changes (generally at close range), with significant field curvature in the outer field of view at the central focus position. For typical mobile phone lenses, the ideal focus range is from infinity to 10cm. This focusing method severely impacts close-range image quality; therefore, the more lenses there are, the greater the impact. Furthermore, the larger the image plane, the greater the difference in image height between the edge and center of the aperture when off-axis rays are incident obliquely on the lens system. In other words, aberrations of a large image plane are more difficult to correct, making it easier to cause significant field curvature and tilt in the outer field of view.

[0005] The content in the background section is merely technology known to the public and does not necessarily represent existing technology in this field. Summary of the Invention

[0006] This application aims to provide a camera module, its control method, and an electronic device to solve the problem of significant differences in optical performance between close-up and telephoto shooting scenarios.

[0007] According to one aspect of this application, a camera module is provided, comprising: a photosensitive component; a lens assembly disposed on the photosensitive path of the photosensitive component; and a filter assembly comprising a first filter element, a second filter element, and at least one driver, wherein the at least one driver selectively drives the first filter element or the second filter element to move onto the photosensitive path of the photosensitive component, and the filter assembly is disposed between the photosensitive component and the lens assembly.

[0008] According to some embodiments, the thickness of the first filter element is 0.13 mm to 0.17 mm.

[0009] According to some embodiments, the thickness of the second filter element is 0.19 mm to 0.23 mm. The first filter element and the second filter element have different thicknesses.

[0010] According to some embodiments, the filter assembly further includes at least one bracket disposed between the photosensitive assembly and the lens assembly.

[0011] The first filter element and the second filter element do not contact the at least one support.

[0012] According to some embodiments, the at least one support includes: a first receiving groove in which the first filter element is received; a second receiving groove in which the second filter element is received; and a light window through which the light-sensing path of the photosensitive component passes, wherein both the first receiving groove and the second receiving groove have openings that allow the first filter element and the second filter element to move to the light window.

[0013] According to some embodiments, the filter assembly further includes at least one transmission member, the at least one transmission member connecting the first filter element and the second filter element, and the at least one driver driving the at least one transmission member to drive the first filter element and the second filter element to move in opposite directions.

[0014] According to some embodiments, the camera module further includes a circuit board assembly, and the at least one driver is disposed on the circuit board assembly.

[0015] According to some embodiments, the at least one actuator includes a piezoelectric actuator or a solenoid valve actuator.

[0016] According to some embodiments, both the first filter element and the second filter element include a transparent flat-plate filter.

[0017] According to some embodiments, the incident and exit surfaces of the filter are coated with optical antireflective coatings and / or infrared cutoff coatings.

[0018] According to one aspect of this application, a method for controlling the camera module as described above is provided, comprising:

[0019] S1: When the camera module enters the near-focus mode, the filter assembly matches the first filter element and transfers the first filter element to the photosensitive path of the photosensitive assembly;

[0020] S2: When the camera module enters the telephoto mode, the filter assembly matches the second filter element and transfers the second filter element to the photosensitive path of the photosensitive assembly.

[0021] According to some embodiments, when switching from S1 to S2, the first filter element is moved away from the photosensitive path of the photosensitive component, and the second filter element is moved onto the photosensitive path of the photosensitive component.

[0022] According to some embodiments, when switching from S2 to S1, the second filter element is moved away from the photosensitive path of the photosensitive component, and the first filter element is moved onto the photosensitive path of the photosensitive component.

[0023] According to one aspect of this application, an electronic device is provided, including the camera module as described above.

[0024] Based on the aforementioned camera module, its control method, and electronic device, the at least one driver selectively drives the first filter element or the second filter element to move onto the photosensitive path of the photosensitive component, wherein the first filter element and the second filter element have different thicknesses. The aforementioned camera module has two filter modes and implements a base structure with two filter elements. By adjusting the positions of the first filter element and the second filter element, the optical performance difference between near-focus and far-focus is achieved, and the field curvature of the camera module is improved.

[0025] The aforementioned camera module is capable of all-weather shooting. By setting two filter elements and using at least one driver to move two filters of different thicknesses radially along the lens optical axis, the field curvature generated during close-up and telephoto shooting is corrected respectively. This improves the field curvature of the camera module and solves the problem of optical performance differences between close-up and telephoto shots.

[0026] To further understand the features and technical content of this application, please refer to the following detailed description and drawings of this application. However, this description and drawings are only used to illustrate this application and are not intended to limit the scope of protection of this application in any way. Attached Figure Description

[0027] The embodiments of this disclosure are described in detail below with reference to the accompanying drawings. These drawings, which form part of this disclosure, are used to provide a further understanding of the disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain the disclosure and do not constitute an undue limitation of the disclosure. In the drawings:

[0028] Figure 1-2 A schematic diagram showing the structure of a camera module filter assembly including two brackets according to an example embodiment of this application is provided.

[0029] Figure 3 Show Figure 1 and Figure 2 A side view of the structure of the filter assembly.

[0030] Figure 4-5 A schematic diagram showing the structure of a camera module filter assembly including a bracket according to an example embodiment of this application is provided.

[0031] Figure 6 Show Figure 4 and Figure 5 A side view of the structure of the filter assembly.

[0032] Figure 7-8 This diagram illustrates a structure in which a first filter element of a camera module filter assembly according to an example embodiment of the present application is fixed on a circuit board assembly.

[0033] Figure 9 A schematic diagram showing the structure of a first filter element of a camera module filter assembly fixed on a bracket according to an example embodiment of this application is shown.

[0034] Figure 10 Show Figure 7 , Figure 8 and Figure 9 A side view of the structure of the filter assembly.

[0035] Figure 11-12 A schematic diagram of the structure of the filter component is shown when the camera module according to an example embodiment of this application is in its first working state.

[0036] Figure 13 Show Figure 11 and Figure 12 Top view of the structure of the filter assembly.

[0037] Figure 14-15 A schematic diagram of the structure of the filter component is shown when the camera module according to an example embodiment of this application is in a second working state.

[0038] Figure 16 Show Figure 14 and Figure 15 Top view of the structure of the filter assembly. Detailed Implementation

[0039] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0040] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or connections that allow for communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0044] Currently, in the use of camera modules, the larger the image plane, the greater the difference between the image height formed by off-axis light rays incident obliquely on the lens assembly and the image height formed by light rays passing through the edge of the aperture and passing through the center of the aperture. In other words, the larger the image plane, the more difficult it is to correct aberrations. This results in a large difference in field curvature between close-up and telephoto shooting scenarios. Therefore, there is an urgent need for a camera module that can solve the problem of large differences in optical performance between close-up and telephoto shooting scenarios.

[0045] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0046] Figure 1-2 A schematic diagram showing the structure of a camera module filter assembly including two brackets according to an example embodiment of this application is provided. Figure 3 Show Figure 1 and Figure 2 A side view of the structure of the filter assembly.

[0047] like Figure 1-2 As shown in the example embodiment of this application, this application discloses a camera module 10 including: a photosensitive component 300, a lens component 100, and a filter component 200.

[0048] The lens assembly 100 is disposed on the light-sensing path of the photosensitive assembly 300. The filter assembly 200 includes a first filter element 212, a second filter element 222, and at least one driver 230. The at least one driver 230 selectively drives the first filter element 212 or the second filter element 222 to move onto the light-sensing path of the photosensitive assembly 300. The filter assembly 200 is disposed between the photosensitive assembly 300 and the lens assembly 100.

[0049] According to an embodiment of this application, the lens assembly 100 includes a lens carrier and an optical lens, wherein the lens carrier is mounted on the photosensitive assembly 300, and the optical lens is carried within the lens carrier. The lens assembly 100 is attached to the filter assembly 200 by an adhesive to be held in the light-sensitive path of the photosensitive assembly 300.

[0050] The lens carrier in the camera module 10 can be a lens bracket, that is, the camera module 10 adopts a fixed-focus camera module, and the relative positional relationship between the optical lens and the photosensitive component 300 remains constant. Of course, in other examples of this application, the camera module 10 can also adopt other types of camera modules.

[0051] The camera module 10 can also be a zoom camera module, that is, the lens carrier includes a driving element that can carry and drive the optical lens to move along the light-sensing path direction to change the relative position between the optical lens and the light-sensing component 300.

[0052] For example, the camera module 10 can also be an image-stabilized camera module, that is, the lens carrier uses an image-stabilizing motor to achieve image stabilization. Alternatively, the camera module 10 can also include components such as prisms to form a periscope camera module.

[0053] According to an embodiment of this application, the camera module 10 further includes a circuit board assembly 400, which is electrically connected to the photosensitive chip of the photosensitive assembly 300 and the filter assembly 200. The photosensitive chip is the photosensitive part of the photosensitive assembly 300, used to receive imaging light from the outside and perform imaging.

[0054] According to an embodiment of this application, the circuit board assembly 400 includes at least one first electronic component 410 and at least one second electronic component 420.

[0055] The circuit board assembly 400 also includes a circuit board, the type of which includes flexible boards, rigid boards, rigid-flex boards, ceramic substrates, etc. Of course, this application does not limit the specific type of circuit board. At least one first electronic component 410 and at least one second electronic component 420 are disposed on the circuit board, including but not limited to resistors, capacitors, and inductors. During installation, the electronic components can be mounted and electrically connected to the upper surface of the circuit board using SMT technology. At least one first electronic component 410 and at least one second electronic component 420 are located on the same side as the photosensitive component 300. At least one first electronic component 410 and at least one second electronic component 420 may also be partially or completely embedded within the circuit board.

[0056] At least one first electronic component 410 and at least one second electronic component 420 are distributed on the circuit board assembly 400, and the height of at least one first electronic component 410 is greater than the height of at least one second electronic component 420.

[0057] At least one bracket 210 of the filter assembly 200 is disposed on the circuit board assembly 400, and there is a first gap 430 and a second gap 440 between the at least one bracket 210 and the circuit board assembly 400, wherein the width of the first gap 430 is greater than the width of the second gap 440.

[0058] In this configuration, at least one first electronic component 410 is disposed in the first gap 430, at least one second electronic component 420 is disposed in the second gap 440, and the height of at least one first electronic component 410 is greater than the width of the second gap 440.

[0059] At least one first electronic component 410 has a height greater than 0.38 mm, and the width of the second gap 440 is less than 0.38 mm.

[0060] According to an embodiment of this application, the photosensitive component 300 further includes a molding body for covering electronic components (MOB); the molding body covers a portion of the photosensitive area (MOC) of the photosensitive chip.

[0061] The photosensitive chip is electrically connected to the circuit board via leads, which can be gold, silver, or copper wires. These leads are installed between the circuit board and the photosensitive chip to establish an electrical connection. Leads are formed between the photosensitive chip and the circuit board using either forward or reverse gold bonding. It is worth noting that the upward protrusion of leads formed using reverse gold bonding is relatively lower than that of leads formed using forward gold bonding.

[0062] Therefore, optionally, in this application, a "reverse gold wire bonding" process is used to form the leads. The photosensitive chip and the circuit board can be electrically connected in other ways, for example, by using a back-side conductive scheme.

[0063] According to an embodiment of this application, the filter assembly 200 further includes at least one bracket 210 disposed between the photosensitive assembly 300 and the lens assembly 100. The first filter element 212 and the second filter element 222 do not contact the at least one bracket 210. The first filter element 212 and the second filter element 222 are arranged vertically along the optical axis.

[0064] At least one support 210 includes a first receiving groove in which a first filter element 212 is received. A second receiving groove in which a second filter element 222 is received. A light window through which the light-sensing path of the photosensitive assembly 300 passes. Both the first and second receiving grooves have openings that allow the first filter element 212 and the second filter element 222 to move into the light window.

[0065] According to an embodiment of this application, the filter assembly 200 further includes at least one transmission member 214, which is connected to the first filter element 212 and the second filter element 222. At least one driver 230 drives the at least one transmission member 214 to drive the first filter element 212 and the second filter element 222 to move in opposite directions.

[0066] At least one actuator 230 includes a piezoelectric actuator or a solenoid valve actuator. Both the first filter element 212 and the second filter element 222 comprise transparent, flat-plate filters. The incident and exit surfaces of the filters are coated with optical anti-reflective coatings and / or infrared cut-off coatings.

[0067] According to an embodiment of this application, when the first filter element 212 and the second filter element 222 can move relative to each other, the thickness of the first filter element 212 is 0.13 mm to 0.17 mm, and the thickness of the second filter element 222 is 0.19 mm to 0.23 mm. The first filter element 212 and the second filter element 222 have different thicknesses.

[0068] According to an embodiment of this application, the filter assembly 200 includes at least one bracket 210, a first filter element 212, and a first driving device. Here, the at least one bracket 210 includes a first bracket 211. Since the first filter element 212 has a large travel distance, the first driving device in this embodiment adopts a driver structure. The driver structure can be a piezoelectric structure, a solenoid valve structure, a gear structure, etc. That is, the first driving device includes a first driver and a first transmission member 215.

[0069] The first bracket 211 and the lens assembly 100 are arranged vertically along the optical axis. The first bracket 211 is located below the lens assembly 100 and is connected to the lens assembly 100 by an adhesive.

[0070] A recessed portion is provided on one side of the first bracket 211, which is a first receiving groove for accommodating the first filter element 212 and the first transmission component 215. The height of the first filter element 212 is less than the height of the first receiving groove of the first bracket 211 to prevent the lens assembly 100 above the first filter element 212 from squeezing the first filter element 212 and interfering with each other. At the same time, the first filter element 212 and the first receiving groove are hollowed out to prevent friction between the first filter element 212 and the first bracket 211 during the movement of the first filter element 212, which would cause damage to the first filter element 212.

[0071] In this embodiment, the first transmission component 215 is disposed on the side of the first filter element 212, and the first driver is disposed on the side of the first transmission component 215. That is, the first transmission component 215 is disposed between the first driver and the first filter element 212. In this embodiment, the first driver can drive the first transmission component 215 to move. The first transmission component 215 and the first filter element 212 are connected by an adhesive, thereby driving the first filter element 212 to move along a plane perpendicular to the optical axis.

[0072] The filter assembly 200 also includes at least one bracket 210, a second filter element 222, and a second driving device. Here, at least one bracket 210 includes a second bracket 221. Since the second filter element 222 has a large stroke, the second driving device in this embodiment adopts a driver structure. The driver structure can be a piezoelectric structure, a solenoid valve structure, a gear structure, etc. That is, the second driving device includes a second driver and a second transmission component 224.

[0073] The second bracket 221 and the first bracket 211 are arranged vertically along the optical axis. The second bracket 221 is located below the first bracket 211. The first bracket 211 and the second bracket 221 are connected by an adhesive. The second bracket 221 is attached to the corresponding position on the circuit board.

[0074] A recessed portion is provided on one side of the second bracket 221, which is a second receiving groove for accommodating the second filter element 222 and the second transmission component 224. The height of the second filter element 222 is less than the height of the second receiving groove to prevent the first bracket 211 above the second filter element 222 from squeezing the second filter element 222 and interfering with each other. At the same time, the second filter element 222 and the second receiving groove are hollowed out to prevent the second filter element 222 from rubbing against the second bracket 221 during movement, which would cause damage to the second filter element 222.

[0075] The second transmission member 224 is disposed on the side of the second filter element 222, and the second driver is disposed on the side of the second transmission member 224. That is, the second transmission member 224 is disposed between the second driver and the second filter element 222. In this embodiment, the second driver can drive the second transmission member 224 to move. The second transmission member 224 and the second filter element 222 are connected by an adhesive, thereby driving the second filter element 222 to move along a plane perpendicular to the optical axis.

[0076] The first bracket 211 and the second bracket 221 are provided with light windows, and the first receiving groove of the first bracket 211 and the second receiving groove of the second bracket 221 are provided on one side of the bracket. The other three sides of the bracket are not provided with receiving grooves, which can better support the entire camera module 10 and increase the stability of the camera module 10.

[0077] Optionally, the first driver and the second driver can use the same driver to drive the first filter element 212 and the second filter element 222 simultaneously. Of course, the two drivers can also drive the first filter element 212 and the second filter element 222 respectively, and this application does not make specific limitations. In this application, at least one driver 230 of the filter assembly 200 can be disposed on the circuit board of the circuit board assembly 400 to reduce the occupied space of the filter assembly 200 in the optical axis direction.

[0078] Figure 4-5 Schematic structural view showing that the filter assembly of the camera module according to an exemplary embodiment of the present application includes a bracket. Figure 6 Show Figure 4 And Figure 5 Side view of the structure of the filter assembly.

[0079] As Figure 4-6 As shown, optionally, the first bracket 211 and the second bracket 221 can use one bracket, and the first transmission member 215 and the second transmission member 224 are respectively disposed on the upper side and the lower side of the bracket for connecting the first filter element 212 and the second filter element 222. To reduce the occupied space of the filter assembly 200 in the optical axis direction.

[0080] Optionally, the first filter element 212 and the second filter element 222 can be set to be rectangular, and the first transmission member 215 and the second transmission member 224 are set to be strip-shaped transmission members, which can make one side of the first filter element 212 and the second filter element 222 better fit with the first transmission member 215 and the second transmission member 224, making the movement process more stable. The lengths of the first transmission member 215 and the second transmission member 224 can be set to 5-7 mm.

[0081] Optionally, the first transmission member 215 and the second transmission member 224 can share one transmission member to realize the simultaneous movement of the first filter element 212 and the second filter element 222, or the movement of one of them.

[0082] Figure 7-8 Schematic structural view showing that the first filter element of the filter assembly of the camera module according to an exemplary embodiment of the present application is fixed on the circuit board assembly. Figure 9 Schematic structural view showing that the first filter element of the filter assembly of the camera module according to an exemplary embodiment of the present application is fixed on the bracket. Figure 10 Show Figure 7 、 Figure 8 And Figure 9 Side view of the structure of the filter assembly.

[0083] Refer Figure 7-9As can be seen, according to another embodiment of this application, the first filter element 212 can also be fixed on the light-sensing path of the photosensitive assembly 300 and not move, while at least one driver 230 drives the second filter element 222 to move onto the light-sensing path of the photosensitive assembly 300, with the filter assembly 200 disposed between the photosensitive assembly 300 and the lens assembly 100. The first filter element 212 can be fixed on a circuit board or on at least one bracket 210. In this case, the thickness of the first filter element 212 is 0.13mm to 0.17mm. The sum of the thicknesses of the first filter element 212 and the second filter element 222 is 0.19mm to 0.23mm.

[0084] Figure 11-12 A schematic diagram of the structure of the filter component is shown when the camera module according to an example embodiment of this application is in its first working state. Figure 13 Show Figure 11 and Figure 12 Top view of the structure of the filter assembly. Figure 14-15 A schematic diagram of the structure of the filter component is shown when the camera module according to an example embodiment of this application is in a second working state. Figure 16 Show Figure 14 and Figure 15 Top view of the structure of the filter assembly.

[0085] According to an example embodiment of this application, this application discloses a method for controlling the camera module 10 as described above, including:

[0086] S1: When the camera module 10 enters the near-focus mode, the filter assembly 200 matches the first filter element 212 and transfers the first filter element 212 to the light-sensing path of the photosensitive assembly 300.

[0087] S2: When the camera module 10 enters the telephoto mode, the filter assembly 200 matches the second filter element 222 and transfers the second filter element 222 to the photosensitive path of the photosensitive assembly 300.

[0088] When switching from S1 to S2, the first filter element 212 is moved away from the photosensitive path of the photosensitive assembly 300, and the second filter element 222 is moved onto the photosensitive path of the photosensitive assembly 300.

[0089] In addition, when switching from S2 to S1, the second filter element 222 is moved away from the photosensitive path of the photosensitive assembly 300, and the first filter element 212 is moved onto the photosensitive path of the photosensitive assembly 300.

[0090] like Figure 11-16As shown in the embodiment of this application, the camera module 10 has at least two working states. In the first working state: at least one driver 230 drives at least one transmission member 214, and the at least one transmission member 214 drives the first light-filtering element 212 to move towards the light window direction, that is, towards the optical axis direction of the camera module 10. The at least one transmission member 214 stops moving when the first light-filtering element 212 is orthogonal to the optical axis. At this time, the effective light used for imaging passes through the first light-filtering element 212 in the process of reaching the photosensitive chip, avoiding the presence of light that has not been filtered by the first light-filtering element 212 affecting the image quality. In addition, the first light-filtering element 212 moves to abut against the other side of at least one bracket 210, and the first light-filtering element 212 covers the light window without gaps, which can avoid the risk of stains. At this time, at least one driver 230 drives at least one transmission member 214, which in turn moves the second filter element 222 away from the light window, i.e., towards the second bracket 221 on the side where the second receiving groove is located. The at least one transmission member 214 stops moving when the second filter element 222 is fully retracted into the second receiving groove. At this time, at least one bracket 210 can support and protect the second filter element 222, preventing damage to the second filter element 222.

[0091] In addition, when the camera module 10 is in the second working state: at least one driver 230 drives at least one transmission member 214, which in turn moves the second filter element 222 toward the light window direction, i.e., toward the optical axis direction of the camera module 10. The movement stops when the second filter element 222 reaches the opposite side of at least one bracket 210. At this time, all the effective light used for imaging passes through the second filter element 222 during its journey to the photosensitive chip, preventing unfiltered light from affecting image quality. Furthermore, there is no gap between the opposite bracket and the filter element, avoiding the risk of blemishes. At least one driver 230 drives at least one transmission member 214, which in turn moves the first filter element 212 away from the light window direction, i.e., toward the first bracket 211 on the side where the first receiving groove is located. The movement stops when the first filter element 212 is completely retracted into the first receiving groove. At this time, the first bracket 211 can support and protect the first filter element 212, preventing damage to it.

[0092] According to the embodiments of this application, when shooting a close-up scene, the optical lens moves upward along the optical axis, increasing the back focal length and the imaging area. When light shines from the last lens element in the lens assembly 100 onto the filter assembly 200, the light diverges. To complete the filtering of all light, it is necessary to ensure that all light used for imaging passes through the filter assembly 200. At this time, the closer the filter assembly 200 is to the photosensitive chip, the larger the area of ​​the filter element of the filter assembly 200 needs to be. The closer the filter assembly 200 is to the lens assembly 100, the smaller the area of ​​the filter element of the filter assembly 200 can be.

[0093] According to the embodiments of this application, when shooting a close-up scene, the camera module 10 is in a first working state, the first filter element 212 close to the lens assembly 100 extends out of the first receiving groove, and the second filter element 222 away from the lens assembly 100 retracts back into the second receiving groove, that is, the first filter element 212 is used to filter the light in shooting a close-up scene.

[0094] When shooting telephoto scenes, the camera module 10 moves downward along the optical axis, reducing the back focal length and the imaging area. If it's necessary to ensure that all light used for imaging passes through the filter assembly 200, the camera module 10 can be in a second operating state. The second filter element 222, closer to the lens assembly 100, extends out of the second receiving slot, while the first filter element 212, farther from the lens assembly 100, retracts back into the first receiving slot. In other words, the second filter element 222 is used to filter light during telephoto shooting. This method reduces the area of ​​the filter element, which is beneficial for miniaturizing the camera module 10.

[0095] When shooting telephoto scenes, the field curvature of camera module 10 is close to 0. When shooting close-up scenes, especially ultra-close-up scenes, the requirements for lens deflection of light increase in the outer field of view, while the central field of view remains unaffected. This causes a deviation between the outer and central fields of view, resulting in field curvature. Generally, as the focal length of camera module 10 decreases, the field curvature decreases in the negative direction; that is, the smaller the focal length, the more negative the field curvature. Therefore, the field curvature of the chip in camera module 10 will have a significant difference when shooting close-up and telephoto scenes.

[0096] Meanwhile, the greater the thickness of the filter element in the filter assembly 200 and the higher the deflection distance, the more negative the field curvature. This application switches between using filter elements of different thicknesses for close-up and telephoto scenes. When shooting close-up scenes, the camera module 10 produces a larger field curvature, so a filter element with a smaller thickness (i.e., a filter element with a smaller field curvature) is used. When shooting telephoto scenes, the camera module 10 produces a smaller field curvature, so a filter element with a larger thickness (i.e., a filter element with a larger field curvature) is used. By using filter elements of different thicknesses in combination, the difference in field curvature between close-up and telephoto scenes can be reduced.

[0097] According to an embodiment of this application, the first filter element 212 is used to capture close-up scenes, and the second filter element 222 is used to capture telephoto scenes. The first filter element 212 and the second filter element 222 have different thicknesses.

[0098] Optionally, the thickness of the first filter element 212 is less than the thickness of the second filter element 222. When shooting close-up scenes, the camera module 10 is in a first operating state. At this time, the first filter element 212 extends out of the first receiving slot, and the second filter element 222 retracts back into the second receiving slot. The thickness of the first filter element 212 is smaller, resulting in less field curvature. When shooting telephoto scenes, the camera module 10 is in a second operating state. At this time, the second filter element 222 extends out of the second receiving slot, and the first filter element 212 retracts back into the first receiving slot. The thickness of the second filter element 222 is larger, resulting in greater field curvature. This can better reduce the difference in field curvature between close-up and telephoto scenes, thus solving the difference in optical performance caused by the different field curvatures when the camera module 10 is imaging at close and telephoto, thereby improving image quality. JSR filter elements can be selected. JSR filters are filters coated with filter material on a thinner plastic sheet, which allows for a smaller filter thickness and a certain height advantage.

[0099] According to an embodiment of this application, the first filter element 212 can be mounted upside down on at least one bracket 210, and the second filter element 222 can be mounted face up on at least one bracket 210. This ensures that the two filter elements are far from the photosensitive chip, avoiding blemish imaging and stray light. The combination of the upside-down and face-up structures also creates a gap between the filter element and the upper lens. The upside-down mounting of the first filter element 212 and the face-up mounting of the second filter element 222 further reduces the gap between the first filter element 212 and the second filter element 222, while also making more efficient use of the lens's back focus space. This further reduces the back focus space and lowers the height of the camera module 10.

[0100] According to embodiments of this application, the filtering wavelength of the first filter element 212 is different from that of the second filter element 222 to meet the needs of different shooting scenarios. For example, the filtering portion of the first filter element 212 can be set as infrared filter glass, allowing the camera module 10 to take pictures using infrared light at night. The filtering portion of the second filter element 222 is set as blue glass to accommodate all-weather shooting by the camera module 10.

[0101] The aforementioned camera module 10 has two filter modes and implements a base structure with two filter elements. By adjusting the positions of the first filter element 212 and the second filter element 222, the optical performance difference between near focus and far focus is achieved, and the field curvature of the camera module 10 is improved.

[0102] The camera module 10 is a camera module capable of all-weather shooting. By setting two filter elements and using at least one driver 230 to move two filter elements of different thicknesses radially along the optical axis of the lens, the field curvature generated during close-up and telephoto shooting is corrected respectively. This improves the field curvature of the camera module 10 and solves the problem of optical performance differences between close-up and telephoto shooting.

[0103] According to an example embodiment of this application, this application discloses an electronic device including the camera module 10 as described above.

[0104] The camera module 10 described above can be applied to some electronic devices, such as mobile phones, computers, or cameras, to improve the working performance of electronic devices.

[0105] Finally, it should be noted that the above descriptions are merely exemplary embodiments of this disclosure and are not intended to limit this disclosure. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A camera module, characterized in that, include: Photosensitive components; A lens assembly, wherein the lens assembly is disposed on the light-sensing path of the photosensitive assembly; A light filtering assembly includes a first light filtering element, a second light filtering element, and at least one driver. The at least one driver selectively drives either the first light filtering element or the second light filtering element to move onto the light-sensing path of the photosensitive element. The light filtering assembly is disposed between the photosensitive element and the lens assembly. The first light filtering element is closer to the lens assembly than the second light filtering element. The first light filtering element and the second light filtering element have different thicknesses, and the thickness of the first light filtering element is less than the thickness of the second light filtering element. When the camera module enters the near-focus mode, the filter assembly matches the first filter element and transfers the first filter element to the photosensitive path of the photosensitive assembly; When the camera module enters the telephoto mode, the filter assembly matches the second filter element and transfers the second filter element to the photosensitive path of the photosensitive assembly.

2. The camera module according to claim 1, characterized in that, The thickness of the first filter element is 0.13mm to 0.17mm.

3. The camera module according to claim 1, characterized in that, The thickness of the second filter element is 0.19 mm to 0.23 mm.

4. The camera module according to claim 1, characterized in that, The filter assembly also includes: At least one bracket is disposed between the photosensitive component and the lens component.

5. The camera module according to claim 4, characterized in that, The first filter element and the second filter element do not contact the at least one support.

6. The camera module according to claim 4, characterized in that, The at least one support includes: The first receiving groove, in which the first filter element is received; The second receiving groove, in which the second filter element is received; A light window through which the light-sensing path of the photosensitive component passes, and both the first receiving groove and the second receiving groove have openings that allow the first filter element and the second filter element to move to the light window.

7. The camera module according to claim 1, characterized in that, The filter assembly further includes at least one transmission member, which connects the first filter element and the second filter element. The at least one driver drives the at least one transmission member to drive the first filter element and the second filter element to move in opposite directions.

8. The camera module according to claim 1, characterized in that, It also includes a circuit board assembly, wherein the at least one driver is disposed on the circuit board assembly.

9. The camera module according to claim 1, characterized in that, The at least one actuator includes a piezoelectric actuator or a solenoid valve actuator.

10. The camera module according to claim 1, characterized in that, Both the first filter element and the second filter element include a transparent flat-plate filter.

11. The camera module according to claim 10, characterized in that, The incident and exit surfaces of the filter are coated with optical anti-reflection coatings and / or infrared cut-off coatings.

12. A method for controlling a camera module as described in any one of claims 1-11, characterized in that, include: S1: When the camera module enters the near-focus mode, the filter assembly matches the first filter element and transfers the first filter element to the photosensitive path of the photosensitive assembly; S2: When the camera module enters the telephoto mode, the filter assembly matches the second filter element and transfers the second filter element to the photosensitive path of the photosensitive assembly.

13. The method according to claim 12, characterized in that, When switching from S1 to S2, the first filter element is moved away from the photosensitive path of the photosensitive component, and the second filter element is moved onto the photosensitive path of the photosensitive component.

14. The method according to claim 12, characterized in that, When switching from S2 to S1, the second filter element is moved away from the photosensitive path of the photosensitive component, and the first filter element is moved onto the photosensitive path of the photosensitive component.

15. An electronic device, characterized in that, Includes the camera module as described in any one of claims 1-11.

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