Camera module and terminal

Abstract

The invention provides a camera module and a terminal, the camera module comprises a lens, an image sensor and a first heat conduction part, and the lens at least comprises a first lens and a second lens which are arranged from an object side to an image side; the image sensor is arranged on the image side of the lens and used for converting an optical signal projected by the lens into an electric signal; the first heat conduction part is used for conducting heat generated by the image sensor to the first lens. According to the camera module provided by the invention, the heat generated by the image sensor is conducted to the first lens farther from the image sensor through the heat conduction part, so that the temperature of the first lens is kept above the dew point temperature, and the lenses are prevented from fogging.

Description

Technical Field

[0001] This application relates to the field of imaging technologies, and particularly to an imaging module and a terminal. Background Art

[0002] Equipment such as conference terminals and conference cameras equipped with indoor non-hermetic zoom cameras often experience fogging of the camera lens during use, resulting in blurred images. Fogging usually occurs on the inner surface of the lens and cannot be wiped off from the outside. Such problems are frequent in humid environments (such as the plum rain season in the south). There are generally two results when the lens is used in a humid environment for a long time. The first is that the water mist disappears after the device is turned on and used for 1 hour, and the image returns to normal; the second is that after long-term use in a humid environment, dirt in the environment adheres to the lens with the repeated condensation and evaporation of water vapor, causing permanent dirt on the lens. Summary of the Invention

[0003] An embodiment of this application provides an imaging module and a terminal. The imaging module transfers the heat generated by the image sensor to the first lens through a heat-conducting component, so that the temperature of the first lens reaches above the dew point temperature, thereby avoiding fogging of the lens.

[0004] In a first aspect, this application provides an imaging module. The imaging module includes a lens, an image sensor, and a first heat-conducting component. Among them, the lens at least includes a first lens and a second lens arranged from the object side to the image side; the image sensor is disposed on the image side of the lens and is used to convert the optical signal projected by the lens into an electrical signal; the first heat-conducting component is used to conduct the heat generated by the image sensor to the first lens.

[0005] The imaging module provided by this application conducts the heat generated by the image sensor to the first lens that is far from the image sensor through a heat-conducting component, so that the temperature of the first lens is maintained above the dew point temperature, avoiding the occurrence of lens fogging.

[0006] In a possible implementation, one end of the first heat-conducting component is in contact with the image sensor, and the other end is in contact with the first lens to conduct the heat generated by the image sensor to the first lens.

[0007] The first heat-conducting component is disposed between the image sensor and the first lens and is in direct contact with the image sensor and the first lens respectively, enhancing the heat conduction between the image sensor and the first lens, quickly conducting the heat generated by the image sensor to the first lens, so that the first lens reaches above the dew point temperature before fogging, avoiding the occurrence of lens fogging.

[0008] In another possible implementation, the first heat-conducting component is provided with a contact portion at one end close to the first lens, and the contact portion extends in the direction close to the first lens to contact the outer wall surface of the first lens.

[0009] In another possible implementation, the lens further includes a lens barrel, and the first lens and the second lens are disposed inside the lens barrel; a part of the first lens extends out of the lens barrel, and the contact portion contacts the part of the first lens that extends out of the lens barrel.

[0010] Exemplarily, the first lens is disposed at the open end of the lens barrel, and the end surface size of the end of the first lens close to the object side is larger than the opening size of the lens barrel, overlapping the open end of the lens barrel; one end of the first heat conducting member bends towards the lens barrel to form a contact portion, and the contact portion contacts the first lens overlapping the open end of the lens barrel. On the one hand, the first heat conducting member serves to fix the first lens and the lens barrel, and on the other hand, the first heat conducting member conducts the heat generated by the image sensor to the first lens.

[0011] In one example, the first heat conducting member is attached to the outer wall surface of the lens barrel. In this way, the first heat conducting member conducts the heat generated by the image sensor to the entire lens barrel, realizing uniform distribution of temperature throughout the lens barrel, and further preventing fogging inside the lens.

[0012] In another possible implementation, for a lens having a window, the first heat conducting member also contacts the window to conduct the heat generated by the image sensor to the window, so that the temperature of the window reaches above the dew point temperature and prevents the window from fogging.

[0013] In another possible implementation, the imaging module provided in the present application further includes a lens driving board and a second heat conducting member. One end of the second heat conducting member contacts the lens driving board, and the other end contacts the first lens to conduct the heat generated by the lens driving board to the first lens.

[0014] The lens driving board in the imaging module also operates to generate heat. The second heat conducting member is used to conduct the heat generated by the lens driving board to the first lens, realizing conduction of the heat of two heat sources, namely the image sensor and the lens barrel driving board, to the first lens, further increasing the heating rate of the first lens, ensuring that the first lens reaches above the dew point temperature before fogging, and preventing the water vapor inside the lens from condensing and fogging on the surface of the first lens.

[0015] In another possible implementation, the imaging module provided in the present application further includes a heat conducting body, and the heat conducting body covers one end of the image sensor facing away from the lens; the first heat conducting member contacts the heat conducting body. By means of the heat conducting body, the contact area with the image sensor is increased, and the heat conduction efficiency is increased.

[0016] In another possible implementation, a radiator is disposed at one end of the heat conducting body facing away from the lens. In this way, the heat generated by the image sensor is conducted to the radiator through the heat conducting body, and then the heat is dissipated to the outside through the radiator, reducing the temperature and the heating rate of the image sensor.

[0017] In another possible implementation, the camera module provided by the present application further includes a housing having a receiving cavity, and the lens and the image sensor are both disposed in the receiving cavity; the heat conductor is in contact with the inner wall of the housing to conduct the heat generated by the image sensor to the housing for heat dissipation.

[0018] In this possible implementation, the heat generated by the image sensor is conducted to the housing through the heat conductor, so that the heat is not concentrated inside the lens. Relying on the geometric structure of the housing with a large heat dissipation area, rapid heat dissipation is achieved, and the vaporization of water inside the lens is reduced.

[0019] The material of the housing can be selected according to actual needs. For example, when the heat temperature generated by the used image sensor is very high (such as reaching 55°C - 80°C), the housing can be made of a metal material with good thermal conductivity, which is beneficial to heat dissipation. For example, an aluminum material housing can be selected, and its thermal conductivity is 235, which can quickly dissipate the heat into the air to achieve rapid heat dissipation. Another example is that when the heat temperature generated by the used image sensor is not too high (such as the temperature is between 45°C - 55°C), the housing can be made of a plastic heat-conducting material, which can reduce the cost of the housing while meeting the heat dissipation requirements.

[0020] In another possible implementation, the first heat-conducting component, the second heat-conducting component, and the heat conductor can select appropriate heat-conducting materials according to actual situations, such as selecting according to the structures of the image sensor and the lens and the required thermal conductivity. For example, the first heat-conducting component, the second heat-conducting component, and the heat conductor can include one or more of silicone resin bodies, heat-conducting insulating films, heat-conducting silicone greases, heat-conducting greases, heat-conducting adhesives, heat-conducting pads, and heat-conducting gels. For example, the heat conductor can be a heat-conducting pad, that is, by arranging a heat-conducting pad between the image sensor and the housing, the heat generated by the image sensor is conducted to the housing for heat dissipation; the first heat-conducting component and the second heat-conducting component can be heat-curing heat-conducting insulating tapes. By arranging a heat-curing heat-conducting insulating tape between the first lens and the image sensor, on the one hand, the first lens is fixed at the opening of the lens barrel, and on the other hand, the heat generated by the image sensor is conducted to the first lens, so that the temperature of the first lens is raised above the dew point temperature to avoid fogging.

[0021] In a second aspect, the present application provides a terminal including the camera module provided in the first aspect, which avoids fogging of the camera module of the terminal.

[0022] The terminal can be any terminal with a camera function. For example, the terminal includes but is not limited to mobile phones, tablet computers, wearable devices, laptop computers, ultra-mobile personal computers (UMPCs), handheld computers, personal digital assistants (PDAs), dash cams, virtual reality devices, surveillance cameras of security equipment, conference terminals, and conference room cameras, etc., which are terminals with a camera function.

[0023] When the terminal is a conference terminal, the conference terminal further includes a base, and the camera module provided in the first aspect is rotatably arranged on the base. Description of the Drawings

[0024] Figure 1 Shows the fogging position of the lens in the camera module;

[0025] Figure 2 Shows an infrared analysis diagram of the overall heat generation of the lens barrel during the operation of a camera module;

[0026] Figure 3 Schematic structural diagram of a camera module provided by an embodiment of the present application;

[0027] Figure 4 Shows another schematic structural diagram of the camera module provided by an embodiment of the present application;

[0028] Figure 5 Shows another schematic structural diagram of the camera module provided by an embodiment of the present application;

[0029] Figure 6 Shows another schematic structural diagram of the camera module provided by an embodiment of the present application;

[0030] Figure 7 Shows a schematic structural diagram of a conference terminal. Detailed Description of the Embodiment

[0031] The term "and / or" mentioned in this article is an association relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The symbol " / " in this article represents an "or" relationship between associated objects. For example, A / B represents A or B.

[0032] The terms "first" and "second" in the description and claims of this article are used to distinguish different objects, rather than to describe a specific order of the objects. For example, the first lens and the second lens are used to distinguish different lenses, rather than to describe a specific order of the lenses.

[0033] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0034] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" refers to two or more. For example, a plurality of lenses refers to two or more lenses, etc.; a plurality of elements refers to two or more elements, etc.

[0035] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0036] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or a contact connection or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0037] To facilitate the understanding of the solutions of the embodiments of the present application, the technical terms involved herein are first explained below.

[0038] An image sensor is the core component of a camera module, and its function is to convert optical signals into electrical signals.

[0039] In related technologies, various solutions are adopted to solve the problem of fogging of non-hermetic lenses. For example, in Related Technology One, a lens defogging device includes a housing, a fan, a motor, a battery and an air guide cover. The air guide cover is fixed to one end of the housing, and the fan driven by electricity enables the defogging device to automatically dry the lens and eliminate the inconvenience caused by water mist.

[0040] However, the method of using a fan to dry the water mist in this solution cannot eliminate the water mist inside the lens.

[0041] In the second related art, an ultra-thin transparent heating window is adopted, so that the heat required for the transparent heating window to rise to the defogging temperature is extremely small. It has been found through research that by selecting a transparent conductive layer with a sheet resistance of 5 - 200 Ω and configuring the transparent heating window and the transparent conductive layer according to the above-mentioned size ratio, safe defogging can be achieved in an ultra-short time.

[0042] However, in this solution, the coating will affect the optical parameters of the lens, and thus affect the function of the camera.

[0043] The camera defogging device in the third related art is used to prevent the lens of the camera module on the vehicle from fogging up. It mainly includes an electric heating protective cover, which includes a protective cover body and a protective cover connector provided on the outer wall of the protective cover body and integrated with the protective cover body. An accommodating cavity for accommodating the camera module and having an opening on one side is constructed in the protective cover body. The camera light incident path area in the protective cover body is made of a transparent material with an electric heating wire, and the electric heating wire is electrically connected to the connector. It also includes a trigger switch electrically connected to the connector, which can receive a defogging signal to control the start and stop heating function of the electric heating wire.

[0044] However, in this solution, heating the camera with the heating wire will cause an uncontrollable temperature drift of the lens by the self-generated equipment, which may introduce new abnormalities.

[0045] In view of the above problems, the embodiment of the present application provides an imaging module, which transfers the heat generated by the image sensor to the first lens through a heat-conducting component, so that the temperature of the first lens reaches above the dew point temperature, thereby avoiding fogging of the lens.

[0046] The following details the specific implementation of the imaging module provided by the embodiment of the present application through the drawings.

[0047] Figure 1 The fogging position of the lens in the imaging module is shown. As Figure 1 shown, the fogging of the non-hermetic imaging module often occurs on the inner surface of the G1 lens (i.e., the first lens).

[0048] It can be understood that a non-hermetic imaging module refers to a lens cavity that is non-hermetic, and external humid air will enter the lens cavity. Most of the imaging modules of common terminals in life are non-hermetic imaging modules. For example, the imaging modules of mobile phones, conference terminals, and surveillance cameras of security equipment are all non-hermetic imaging modules. Hermetic imaging modules are not common due to their high cost.

[0049] Figure 2 An infrared analysis diagram of the overall heat generation of the lens barrel during the operation of an imaging module is shown. As Figure 2As shown, the infrared thermal analysis results of the overall heat generation of the lens barrel indicate that the image sensor (since the heat source of the image sensor is the sensor board, the heat generated by the image sensor can also be referred to as the heat generated by the sensor board) is the largest heat source of the camera. The temperature of the sensor board located at the rear end of the lens barrel is 37.44 °C, and the highest can reach 50.3 °C. Moreover, the sensor board can heat up quickly. In a humid environment, the high temperature of the sensor board accelerates the vaporization of water droplets around it, increasing the relative humidity of the air inside the lens barrel. Under normal temperature and pressure, the higher the relative humidity, the higher the dew point. When the camera is just turned on, the sensor board heats up rapidly, causing the dew point to rise quickly. At this time, the overall temperature of the lens has not reached thermal equilibrium. The G1 lens is at the far end of the sensor board and heats up the slowest. When the dew point rises above the temperature of the G1 lens of the lens, condensation occurs. A similar example is that glasses are more likely to fog up when eating hot pot.

[0050] As described above, the root cause of fogging inside the lens is due to uneven temperature inside the camera module. The high temperature of the sensor board causes water droplets in the humid environment to vaporize, which in turn leads to an increase in the humidity inside the lens. The increase in humidity causes the dew point temperature to increase, while the temperature of the G1 lens, which is far from the sensor board, is relatively low and lower than the dew point temperature, resulting in condensation of water vapor on the inner surface of the G1 lens to form small water droplets, thus causing the phenomenon of lens fogging. Therefore, in the embodiments of the present application, the camera module is improved to make the temperature inside the camera module as evenly distributed as possible, completely solving the problem of lens fogging from the source, avoiding the impact of lens fogging on the shooting effect during the operation of the camera module, and the lens contamination caused by fogging.

[0051] Figure 3 It is a schematic structural diagram of a camera module provided by an embodiment of the present application.

[0052] As Figure 3 shown, the camera module 300 provided by the embodiment of the present application includes a lens, a sensor board 303, and a first heat conduction component 304. Among them, the lens includes at least multiple lenses (lenses). For example, the multiple lenses include a G1 lens 301 (i.e., the first lens) and a G2 lens 302 (i.e., the second lens) arranged from the object side to the image side; the sensor board 303 is disposed on the image side of the lens and is used to convert the optical signal projected by the lens into an electrical signal; the first heat conduction component 304 is used to conduct the heat generated by the sensor board 303 to the G1 lens 301.

[0053] The first heat-conducting component 304 has good heat-conducting performance and is respectively in contact with the sensor board 303 and the G1 lens 301 to conduct the heat generated by the sensor board 303 to the G1 lens 301. For example, one end of the first heat-conducting component 304 is in contact with the sensor board 303, and the other end is in contact with the G1 lens 301, enhancing the heat-conduction path between the sensor board 303 and the G1 lens 301, realizing the conduction of the heat generated by the sensor board 303 to the G1 lens 301, so as to ensure that the temperature of the G1 lens 301, which is far from the sensor board 303, is above the dew point temperature and avoid fogging of the lens.

[0054] For the contact between the first heat-conducting component 304 and the G1 lens 301, a contact part is provided at one end of the first heat-conducting component 304 close to the G1 lens 301, and the contact part 3041 extends in the direction close to the G1 lens 301 to contact the outer wall surface of the G1 lens 301.

[0055] Continue to refer to Figure 3 , the lens further includes a lens barrel 305, and the G1 lens 301 and the G2 lens 302 are arranged in the lens barrel 305; a part of the G1 lens 301 extends out of the lens barrel 305, and the contact part 3041 contacts the part of the G1 lens 301 that extends out of the lens barrel 305.

[0056] Exemplarily, the G1 lens 301 is arranged at the open end of the lens barrel 305, and the end face size of the end of the G1 lens 301 close to the object side is larger than the opening size of the lens barrel 305, overlapping the open end of the lens barrel 305; one end of the first heat-conducting component 304 close to the G1 lens 301 is bent towards the lens barrel 305 to form a contact part, and the contact part 3041 contacts the G1 lens 301 overlapping the open end of the lens barrel 305. On the one hand, the first heat-conducting component 304 serves the purpose of fixing the G1 lens 301 to the lens barrel 305, and on the other hand, the first heat-conducting component 304 uses its good heat conductivity to conduct the heat generated by the sensor board 303 to the G1 lens 301, reducing the temperature difference between the sensor board 303 and the G1 lens 301.

[0057] From Figure 3 , it can be seen that in order not to affect the optical function of the lens, the length of the contact part 3041 of the first heat-conducting component 304 extending towards the lens barrel 305 is limited, and the outer edge of the contact part does not exceed the inner wall surface of the lens barrel 305 after the contact part 3041 contacts the G1 lens 301.

[0058] To further make the temperature distribution in the lens barrel 305 uniform, the first heat-conducting component 304 is attached to the outer wall surface of the lens barrel 305. In this way, the first heat-conducting component 304 conducts the heat generated by the sensor board 303 to the entire lens barrel 305, achieving uniform temperature distribution throughout the lens barrel 305 and further preventing fogging inside the lens.

[0059] In one example, the first heat-conducting component 304 can be a strip-shaped heat-conducting bar. The two end parts of the heat-conducting bar are respectively in contact with the sensor board 303 and the G1 lens 301, and the remaining part is closely attached to the outer wall surface of the lens barrel 305 to conduct the heat generated by the sensor board 303 to the entire lens barrel 305, achieving a balanced temperature distribution in the lens barrel 305.

[0060] Optionally, the first heat-conducting component 304 includes a plurality of heat-conducting bars, and the plurality of heat-conducting bars are evenly distributed at intervals along the circumferential direction of the outer wall surface of the lens barrel 305, and the heat generated by the sensor board 303 is evenly conducted to the lens barrel 305 and the G1 lens 301.

[0061] In another example, the first heat-conducting component 304 can also be a sheet-shaped heat-conducting sheet. The heat-conducting sheet covers and wraps the outer wall surface of the lens barrel 305, and the two ends are respectively in contact with the sensor board 303 and the G1 lens 301. The good heat conductivity of the heat-conducting sheet is used to conduct the heat generated by the sensor board 303 to the entire lens barrel 305 and the G1 lens 301, and the temperature distribution of the lens barrel 305 is balanced.

[0062] Back to Figure 3 , the camera module 300 provided by the embodiment of the present application further includes a lens driving board 306. When the camera module 300 is working, the lens barrel driving board 306 will also generate heat. To further accelerate the heating speed of the G1 lens 301 so that the temperature of the G1 lens 301 rapidly rises above the dew point temperature, a second heat-conducting component 307 is provided between the lens driving board 306 and the G1 lens 301, and the heat generated by the lens driving board 306 is conducted to the G1 lens 301 by using the heat conductivity of the second heat-conducting component 307.

[0063] Exemplarily, one end of the second heat-conducting component 307 is in contact with the lens driving board 306, and the other end is in contact with the G1 lens 301, enhancing the heat conduction path between the lens driving board 306 and the G1 lens 301, and realizing the conduction of the heat generated by the lens driving board 306 to the G1 lens 301 and accelerating the temperature rise of the G1 lens 301.

[0064] Similar to the first heat-conducting component 304, the second heat-conducting component 307 is also provided with a contact portion for facilitating contact with the G1 lens 301. For the specific structure of the contact portion, refer to the description of the contact portion 3041 of the first heat-conducting component 304. For the sake of brevity, it will not be elaborated here.

[0065] In order to further make the temperature distribution in the lens barrel 305 uniform, the second heat-conducting component 307 is attached to the outer wall surface of the lens barrel 305. In this way, the second heat-conducting component 307 conducts the heat generated by the lens driving board 306 to the entire lens barrel 305, realizing uniform temperature distribution throughout the lens barrel 305 and further preventing fogging inside the lens.

[0066] Optionally, the first heat-conducting component 304 can be a strip-shaped heat-conducting bar. The two end portions of the heat-conducting bar are respectively in contact with the lens driving board 306 and the G1 lens 301, and the remaining part is closely attached to the outer wall surface of the lens barrel 305 to conduct the heat generated by the lens driving board 306 to the entire lens barrel 305, realizing balanced temperature distribution in the lens barrel 305.

[0067] It can be understood that the lens driving board 306 refers to a circuit board that can realize one or more functions of transmitting the image signal generated by the sensor board 303 to the processing unit (such as GPU) of the terminal, transmitting the driving signal of the lens motor during zooming of the camera module, and supplying power to the sensor board and the lens motor.

[0068] As Figure 3 shown, the camera module 300 provided in the present application further includes a housing 308. The housing 308 defines a receiving cavity. The lens, the sensor board 303, and the lens driving board 306 are all disposed in the receiving cavity. There is a gap between the lens barrel 305 and the inner wall of the housing 308. The thicknesses of the first heat-conducting component 304 and the second heat-conducting component 307 are less than or equal to the gap between the lens barrel 305 and the inner wall of the housing 308, so that the first heat-conducting component 304 and the second heat-conducting component 307 have a setting space.

[0069] Figure 4 shows another structural schematic diagram of the camera module provided in the embodiment of the present application. As Figure 4 shown, the camera module 300 provided in the present application further includes a heat-conducting body 309. The heat-conducting body 309 covers one end of the sensor board 303 facing away from the lens; the first heat-conducting component 304 is in contact with the heat-conducting body 309, and the contact area with the sensor board 303 is increased through the heat-conducting body 309, increasing the heat conduction efficiency.

[0070] Exemplarily, one end face of the first heat-conducting component 304 close to the sensor board 303 contacts the heat-conducting body 309 covering the surface of the sensor board 303, and the side surface contacts the end face of the sensor board 303, increasing the effective heat contact area between the first heat-conducting component 304 and the sensor board 303, and increasing the efficiency of the first heat-conducting component 304 in conducting the heat generated by the sensor board 303 to the G1 lens 301.

[0071] It should be noted that Figure 4 is only a possible implementation example of the camera module, and does not limit the embodiments of the present application. For example Figure 4 the heat-conducting body 309 in it can also extend to contact the inner wall surface of the housing 308 to conduct the heat generated by the sensor board 303 to the housing for heat dissipation, reducing the temperature rising speed of the sensor board 303.

[0072] Figure 5 shows another structural schematic diagram of the camera module provided by the embodiments of the present application. As Figure 5 shown, the camera module 300 provided by the present application further includes a radiator 310, and the radiator 310 is arranged at one end of the heat-conducting body 309 away from the lens. In this way, the heat generated by the sensor board 303 is conducted to the radiator 310 through the heat-conducting body, and then the heat is dissipated to the outside through the radiator, reducing the temperature and the temperature rising speed of the sensor board 303.

[0073] Figure 6 shows another structural schematic diagram of the camera module provided by the embodiments of the present application. Figure 6 In the shown camera module, the heat-conducting body 309 contacts the inner wall of the housing 308 to conduct the heat generated by the sensor board 303 to the housing 308 for heat dissipation.

[0074] Figure 6 In the shown camera module structure, on the one hand, the heat generated by the sensor board 303 is conducted to the outside for heat dissipation by using the heat-conducting body to contact the housing, prolonging the time for the sensor board 303 to rise from room temperature to the highest temperature; on the other hand, the heat-conducting components (such as the first heat-conducting component and the second heat-conducting component) conduct the heat generated by the sensor board 303 and the lens driving board 306 to the G1 lens 301, ensuring that the G1 lens 301 can reach above the dew point temperature before fogging.

[0075] The housing material can be selected according to actual needs. For example, when the heat generated by the sensor board 303 is very high (such as reaching 55°C - 80°C), the housing can be made of a metal material with good thermal conductivity, which is beneficial to heat dissipation. For example, an aluminum housing can be selected, with a thermal conductivity of 235, which can quickly dissipate heat into the air to achieve rapid heat dissipation. Another example is when the heat generated by the sensor board 303 is not too high (such as the temperature is between 45°C - 55°C), the housing can be made of a plastic thermal conductive material, which can reduce the housing cost while meeting the heat dissipation requirements.

[0076] The camera module provided by the embodiment of the present application utilizes the principle of heat conduction to prevent fogging inside the lens. According to Fourier's law: Among them, Q represents the heat conduction; k represents the thermal conductivity; ΔT represents the temperature change; A represents the cross-sectional area; L represents the material thickness. The heat conductor conducts the heat generated by the sensor board to the housing of the camera module through heat conduction, so that the heat is not concentrated inside the lens. Relying on the geometric structure of the large heat dissipation area of the housing, when the same amount of heat is generated by the sensor board, ΔT can be reduced. At this time, the temperature of the sensor board decreases and the heating time is extended, reducing the vaporization of water vapor in the lens environment. The heat conducting component mainly solves the problem that the distance between the Sensor board and the G1 lens is far, and the heating efficiency is low by means of convective heat transfer and thermal radiation. The heat conducting component transfers the heat of the sensor board to the G1 lens through the heat conducting material, and at the same time leads the heat of the lens driving board to the G1 lens, so that the temperature of the G1 lens quickly rises above the dew point.

[0077] In this way, by setting a heat conductor and a heat conducting component in the lens module, the temperature of the G1 lens at the farthest end of the sensor board is always kept above the dew point temperature. At this time, all the lenses in the lens are higher than the dew point, and no condensed water droplets are generated in the lens, achieving the purpose of preventing the lens from fogging.

[0078] The heat generated when the sensor board works in different camera modules may be different. The camera module with the structure shown in the embodiment of the present application can be selected according to the amount of heat generated by the sensor board. Figures 3 to 6 For example, for a sensor board with a very high working temperature (such as greater than 55°C), for example, for a sensor board with a working temperature of 55°C - 80°C, the structure shown in Figure 6 can be adopted. Figure 6 The structure shown has the best anti-fogging performance. For a sensor board with a relatively high working temperature (such as 45°C - 55°C), the structure shown in Figure 5 can be adopted. Figure 5The anti-fogging performance of the shown structure is medium. For the medium working temperature of the sensor board (e.g., 40°C - 45°C), the structure shown in Figure 4 can be adopted. For the lower working temperature of the sensor board (e.g., less than 40°C), the structure shown in Figure 3 can be adopted to reduce the cost of the camera module while meeting the defogging requirements.

[0079] It should be explained that the first heat-conducting component, the second heat-conducting component, and the heat conductor can select appropriate heat-conducting materials according to the actual situation, such as according to the structure of the sensor board and the lens and the required heat-conductivity coefficient. For example, the first heat-conducting component, the second heat-conducting component, and the heat conductor can include one or more of silicone resin bodies, heat-conducting insulating films, heat-conducting silicone greases, heat-conducting greases, heat-conducting adhesives, heat-conducting pads, and heat-conducting gels. For example, the heat conductor can be a heat-conducting pad, that is, by setting a heat-conducting pad between the sensor board and the housing, the heat generated by the sensor board is conducted to the housing for heat dissipation; the first heat-conducting component and the second heat-conducting component can be heat-curing heat-conducting insulating tapes. By setting heat-curing heat-conducting insulating tapes between the first lens and the sensor board, on the one hand, the G1 lens is fixed at the opening of the lens barrel, and on the other hand, the heat generated by the sensor board is conducted to the G1 lens, so that the temperature of the G1 lens rises above the dew point temperature to avoid fogging of the lens.

[0080] Some camera modules have windows. For the lenses with windows, in the camera module provided by the embodiment of the present application, the first heat-conducting component also contacts the window to conduct the heat generated by the sensor board to the window, so that the temperature of the window reaches above the dew point temperature to prevent the window from fogging.

[0081] It should be pointed out that the camera module shown in the embodiment of the present application Figures 4 - 6 is only an example and does not limit the embodiment of the present application. It may include more or fewer components. For example, the lens of the camera module 300 may also include more lenses, such as G3 lens, G4 lens, etc.

[0082] In the embodiments of the present application, the lens of the camera module can be a zoom lens or a fixed-focus lens. For example, when the lens of the camera module is a zoom lens, G1 lens, G2 lens, G3 lens, G4 lens, G5 lens, G6 lens, G7 lens, G8 lens, and G9 lens are arranged in sequence from the object side to the image side in the lens. Among them, G1 lens, G2 lens, and G3 lens form the first lens group, G4 lens, G5 lens, and G6 lens form the second lens group, and G7 lens, G8 lens, and G9 lens form the third lens group. By adjusting the distance between each lens group, different focal lengths can be adjusted.

[0083] In the camera module provided by the embodiments of the present application, there is no specific limitation on the lenses in the lens (such as G1 lens and G2 lens). The surface type of the lens can be a spherical surface type or an aspherical surface type, and the material of the lens can be optical glass or optical plastic, etc.

[0084] The camera module provided by the embodiments of the present application can be applied to any terminal with a camera function. For example, the terminal includes but is not limited to mobile phones, tablet computers, wearable devices, laptop computers, ultra-mobile personal computers (UMPCs), handheld computers, personal digital assistants (PDAs), dash cams, virtual reality devices, surveillance cameras of security equipment, conference terminals, and conference room cameras, etc., which have a camera function, to prevent the camera module of the terminal from fogging and affecting the camera effect.

[0085] Exemplarily, Figure 7 shows a schematic structural diagram of a conference terminal. As Figure 7 shown, the conference terminal includes the camera module 300 provided by the embodiments of the present application and a base 400. The camera module 300 is rotatably arranged on the base 400. When it is necessary to adjust the viewing angle of the camera module 300, a driving device (not shown in the figure, such as a driving motor) at the end of the base 400 drives the camera module to rotate to adjust the viewing angle. Even in a humid environment, the lens of the camera module of the conference terminal will not fog during operation, ensuring the camera effect.

[0086] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An imaging module, characterized in that, it includes: a lens, at least including a first lens and a second lens arranged from the object side to the image side; an image sensor, arranged on the image side of the lens, for converting the optical signal projected by the lens into an electrical signal; a first heat-conducting component, for conducting the heat generated by the image sensor to the first lens.

2. The imaging module according to claim 1, characterized in that, one end of the first heat-conducting component is in contact with the image sensor, and the other end is in contact with the first lens, so as to conduct the heat generated by the image sensor to the first lens.

3. The imaging module according to claim 1 or 2, characterized in that, a contact portion is arranged at one end of the first heat-conducting component close to the first lens, and the contact portion extends towards the first lens and contacts the outer wall surface of the first lens.

4. The imaging module according to claim 3, characterized in that, the lens further includes a lens barrel, and the first lens and the second lens are arranged in the lens barrel; a part of the first lens extends out of the lens barrel, and the contact portion contacts the part of the first lens extending out of the lens barrel.

5. The imaging module according to claim 4, characterized in that, the first heat-conducting component is attached to the outer wall surface of the lens barrel.

6. The imaging module according to any one of claims 1-5, characterized in that, the lens further includes a window; the first heat-conducting component is in contact with the window, so as to conduct the heat generated by the image sensor to the window.

7. The imaging module according to any one of claims 1-6, characterized in that, it further includes: a lens driving board; a second heat-conducting component, one end of which is in contact with the lens driving board, and the other end is in contact with the first lens, so as to conduct the heat generated by the lens driving board to the first lens.

8. The imaging module according to any one of claims 1-7, characterized in that, it further includes: a heat-conducting body, covering one end of the image sensor facing away from the lens; the first heat-conducting component is in contact with the heat-conducting body.

9. The imaging module according to claim 8, characterized in that, a radiator is arranged at one end of the heat-conducting body facing away from the lens.

10. The imaging module according to claim 8, characterized in that, it further includes: a housing, having a receiving cavity, and the lens and the image sensor are both arranged in the receiving cavity; the heat-conducting body is in contact with the inner wall of the housing, so as to conduct the heat generated by the image sensor to the housing for heat dissipation.

11. The imaging module according to claim 10, characterized in that, the heat generated by the image sensor is greater than or equal to 55 degrees, and the material of the housing is metal; or, the heat generated by the image sensor is greater than or equal to 45 degrees and less than 55 degrees, and the material of the housing is plastic.

12. The imaging module according to any one of claims 1-11, characterized in that, the first heat-conducting component includes one or more of silicone resin body, heat-conducting insulating film, heat-conducting silicone grease, heat-conducting grease, heat-conducting glue, heat-conducting pad and heat-conducting gel.

13. A terminal, It is characterized in that it includes the camera module according to any one of claims 1-12.

14. The terminal according to claim 13, it is characterized in that the terminal is a conference terminal, and the conference terminal further includes a base, and the camera module is rotatably arranged on the base.

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