Camera modules and electronic equipment

Abstract

The present application discloses a camera module and electronic equipment, including: a lens assembly, an image sensor and a filter coating structure; the image sensor is located on one side of the imaging end of the lens assembly; the filter coating structure is arranged on the lens assembly, and has a reflection characteristic for lasers within a specific wavelength range, and has a transmission characteristic for other lasers outside the specific wavelength range. The camera module provided by the present application, by arranging a filter coating structure on the lens assembly, specifies to remove specific wavelengths on the filter coating structure that are prone to damage the image sensor, so that the filter coating structure has a reflection characteristic for lasers within a specific wavelength range, and a transmission characteristic for other lasers outside the specific wavelength range, so that the camera module can ensure the laser shooting effect while fully reflecting the laser that is prone to damage the image sensor, thereby avoiding damage to the image sensor.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic products, and specifically relates to a camera module and an electronic device. Background Art

[0002] Mobile phones have become popular consumer electronic products and have changed people's lifestyles. Among them, taking photos with mobile phone camera modules is one of the most commonly used functions.

[0003] In these scenarios where lasers are present, the camera modules on existing electronic devices do not have the ability to resist laser damage. Once exposed to high-power lasers, they will form spot-like or cross-shaped failure areas, and will be damaged due to the high power density characteristics of the laser. Summary of the invention

[0004] The present application aims to provide a camera module and an electronic device to solve the problem that the camera module is easily damaged when encountering the high power density characteristics of the laser.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a camera module, including:

[0007] A lens assembly and an image sensor, wherein the image sensor is located on one side of the imaging end of the lens assembly;

[0008] The filter coating structure is arranged on the lens assembly, and the filter coating structure has a reflection characteristic for lasers within a specific wavelength range, and has a transmission characteristic for other lasers outside the specific wavelength range.

[0009] In a second aspect, an embodiment of the present application provides an electronic device, including:

[0010] The device body is provided with a mounting slot, wherein the mounting slot has an opening;

[0011] The camera module is configured such that the image sensor is disposed in the mounting groove and the lens assembly is disposed in the opening.

[0012] In the embodiments of the present application, a filter coating structure is provided on the lens assembly to remove specific wavelengths on the filter coating structure that are likely to cause damage to the image sensor, so that the filter coating structure has a reflection characteristic for lasers within a specific wavelength range and a transmission characteristic for other lasers outside the specific wavelength range. This allows the camera module to ensure the laser shooting effect while fully reflecting the laser that is likely to cause damage to the image sensor, thereby preventing the laser from damaging the image sensor, and enabling the camera module to have the function of resisting laser damage.

[0013] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 is a schematic diagram of a camera module provided according to an embodiment of the present application;

[0016] Figure 2 is a schematic diagram of a camera module provided by an embodiment of the present application being irradiated by laser;

[0017] Figure 3 This is the transmittance curve of the film system with high reflection to the first blue laser;

[0018] Figure 4 This is the transmittance curve of the film system with high reflection to the second blue laser;

[0019] Figure 5 This is the transmittance curve of the film system with high reflection to the first green laser;

[0020] Figure 6 This is the transmittance curve of the film system with high reflection to the second green laser;

[0021] Figure 7 This is the transmittance curve of the film system with high reflection to the first red laser;

[0022] Figure 8 is a schematic diagram of a camera module provided according to another embodiment of the present application;

[0023] Fig. 9 It is to set the transmittance curve of the film system with high reflection at 445nm, 520nm and 638nm;

[0024] Fig.10 It is a film system transmittance curve with high reflection set at 450nm and 525nm;

[0025] Fig.11 is a schematic diagram of the structure of a coating provided according to an embodiment of the present application;

[0026] Fig.12 is a schematic diagram of an electronic device provided according to an embodiment of the present application;

[0027] Reference numerals:

[0028] 1. Lens assembly; 11. Cover plate; 12. Lens;

[0029] 2. Image sensor; 3. Filter coating structure; 31. First coating;

[0030] 32. Second coating; 33. Third coating; 6. First refractive layer;

[0031] 7. Second refractive layer; 8. Cavity layer; 9. Equipment body;

[0032] 10. Filter. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0034] The features of the terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Combine the following Figure 1 A camera module proposed according to an embodiment of the present application is described, and the camera module includes: a lens assembly 1, an image sensor 2 and a filter coating structure 3.

[0037] Among them, the lens assembly 1 is used to collect the reflected light of the illuminated object. The image sensor 2 is the core component of the camera module, which can convert the optical signal into an electrical signal. The image sensor 2 is located on one side of the imaging end of the lens assembly 1. The filter coating structure 3 is arranged on the lens assembly 1. According to user needs, the filter coating structure 3 can be arranged at both ends of the lens assembly 1 or directly in the lens assembly 1. The filter coating structure 3 has the reflection characteristic of the laser within a specific wavelength range, and has the transmission characteristic of other lasers outside the specific wavelength range, wherein the laser within the specific wavelength range reaches the laser damage threshold of the image sensor, and the laser damage threshold is an important parameter that characterizes the ability of the medium irradiated by the laser to resist laser damage. The high concentration of laser energy can cause local deformation or even complete damage inside or on the surface of the medium. Therefore, while the camera module can ensure the laser shooting effect, the laser that is easy to damage the image sensor 2 can be fully reflected to avoid damage to the image sensor 2.

[0038] When the lens assembly 1 is not provided with the filter coating structure 3, as Figure 2 As shown, the external laser will converge after passing through the lens assembly 1. The power density (light power per unit area) of the laser when it reaches the lens assembly 1 is not very high. When the laser reaches the image sensor 2, the laser is focused to the minimum, and the power density at this time reaches the highest value. At this time, the thermal accumulation effect of the continuous laser will cause damage to the image sensor 2.

[0039] When the filter coating structure 3 is set in the lens assembly 1, when the external laser passes through the lens assembly 1, the filter coating structure 3 can fully reflect the laser that is likely to cause damage to the image sensor 2, and transmit other lasers, thereby ensuring the laser shooting effect and avoiding damage to the image sensor 2.

[0040] The camera module provided by the present application sets a filter coating structure 3 on the lens assembly 1, and specifically removes specific wavelengths on the filter coating structure 3 that are likely to cause damage to the image sensor 2, so that the filter coating structure 3 has a reflection characteristic for lasers in a specific wavelength range and a transmission characteristic for other lasers outside the specific wavelength range. This allows the camera module to ensure the laser shooting effect while fully reflecting the lasers that are likely to cause damage to the image sensor 2, thereby avoiding damage to the image sensor 2.

[0041] As a special light source, laser has good monochromaticity. Based on this, for the camera module to take pictures, the visible light band of interest generally refers to 400nm to 700nm, of which 400-500nm is the blue band, 500-600nm is the green band, and 600-700nm is the red band. The so-called good monochromaticity means that the wavelength range of the laser is very narrow. For example, for a helium-neon laser that emits red light, the wavelength distribution range of its light can be as narrow as 0.0000002nm. Therefore, for the effective bandwidth of 400-700nm, the specific wavelength ranges corresponding to some lasers can be specified and cleared when designing the filter coating structure 3. That is, a broadband high-transmittance film of 400-700nm is designed, and some of the specified wavelengths are dug and removed.

[0042] In this embodiment, the specific wavelength range includes wavelength ranges corresponding to blue specific laser, green specific laser and red specific laser. The blue specific laser, green specific laser and red specific laser are lasers that are prone to damage the image sensor.

[0043] The scene where the camera module fails due to laser damage is mainly in the laser exhibition. The laser source in the laser exhibition has two wavelengths of 445nm and 450nm for the blue laser source, that is, the blue specific laser includes: the first blue laser and the second blue laser. The wavelength of the first blue laser is about 445nm, and the wavelength of the second blue laser is about 450nm. It is determined that the wavelength range of the first blue laser includes: 445nm to 445.5nm, and the wavelength range of the second blue laser includes: 449.5nm to 450.5nm. For the green laser source, there are two wavelengths of 520nm and 525nm, that is, the green specific laser includes: the first green laser and the second green laser. The wavelength of the first green laser is about 520nm, and the wavelength of the second green laser is about 525nm. It is determined that the wavelength range of the first green laser includes: 519.5nm to 520.5nm. The wavelength range of the second green laser includes: 524.5nm to 525.5nm. The red laser source has only 638 nm, that is, the red specific laser includes: a first red laser, the wavelength of the first red laser is about 638 nm, and the wavelength range of the first red laser includes: 637.5 nm to 638.5 nm.

[0044] In order to avoid damage to the image sensor in the laser display scene, this embodiment specially designs a narrow-band filter coating structure 3 for the above five wavelengths. The narrow-band design of the five wavelengths can be achieved by optimizing the design of the filter coating structure 3 respectively.

[0045] Specifically, the wavelengths of 445 nm to 445.5 nm in the filter coating structure 3 are removed by digging holes according to the first blue laser. Figure 3 As shown, Figure 3The transmittance curve of the film system with high reflection for the first blue laser shows that after removal, the filter coating structure 3 has the reflection characteristic for the first blue laser and has the transmission characteristic for other lasers except the first blue laser. The research shows that its energy damage does not exceed 2nm, and it can at least ensure the transmission of lasers with wavelengths of 400nm to 440nm and 449nm to 700nm.

[0046] According to the second blue laser, the wavelengths of 449.5nm to 450.5nm in the filter coating structure 3 are removed by digging holes, such as Figure 4 As shown, Figure 4 It is a transmittance curve of the film system with high reflection for the second blue laser. It is not difficult to find that after removal, the filter coating structure 3 has the reflection characteristic for the second blue laser, and has the transmission characteristic for other lasers except the second blue laser. The study found that its energy damage does not exceed 2nm, and it can at least ensure the transmission of lasers with wavelengths of 400nm to 445nm and 454nm to 700nm.

[0047] According to the first green laser, the wavelengths of 519.5nm to 520.5nm in the filter coating structure 3 are removed by digging holes, such as Figure 5 As shown, Figure 5 The transmittance curve of the film system with high reflection for the first green laser shows that after removal, the filter coating structure 3 has the reflection characteristic for the first green laser and has the transmission characteristic for other lasers except the first green laser. The research shows that its energy damage does not exceed 2nm, and it can at least ensure the transmission of lasers with wavelengths of 400nm to 515nm and 524nm to 700nm.

[0048] According to the second green laser, the wavelengths of 524.5nm to 525.5nm in the filter coating structure 3 are removed by digging holes, such as Figure 6 As shown, Figure 6 The transmittance curve of the film system with high reflection for the second green laser shows that after removal, the filter coating structure 3 has the reflection characteristic for the second green laser and has the transmission characteristic for other lasers except the second green laser. The research shows that its energy damage does not exceed 2nm, and it can at least ensure the transmission of lasers with wavelengths of 400nm to 520nm and 529nm to 700nm.

[0049] According to the first red laser, the wavelengths of 637.5nm to 638.5nm in the filter coating structure 3 are removed by digging holes, such as Figure 7 As shown, Figure 7The transmittance curve of the film system with high reflection for the first red laser shows that after removal, the filter coating structure 3 has the reflection characteristic for the first red laser and has the transmission characteristic for other lasers except the first red laser. The research shows that its energy damage does not exceed 2nm, and it can at least ensure the transmission of lasers with wavelengths of 400nm to 633nm and 642nm to 700nm.

[0050] In this embodiment, wavelengths of 445nm to 445.5nm, 449.5nm to 450.5nm, 519.5nm to 520.5nm, 524.5nm to 525.5nm, and 637.5nm to 638.5nm in the filter coating structure 3 are removed by digging holes, so that the filter coating structure 3 has a reflection characteristic for the first blue laser, the second blue laser, the first green laser, the second green laser, and the first red laser, and has a transmission characteristic for other lasers except the first blue laser, the second blue laser, the first green laser, the second green laser, and the first red laser, thereby preventing the first blue laser, the second blue laser, the first green laser, the second green laser, and the first red laser from causing damage to the image sensor.

[0051] According to an electronic device of an embodiment of the present application, Figure 8 As shown, the filter coating structure 3 includes: a first coating 31 and a second coating 32. The first coating 31 is arranged on the lens assembly 1, and has a reflection characteristic for lasers within the first wavelength range, and has a transmission characteristic for other lasers outside the first wavelength range. The second coating 32 is located on one side of the first coating 31, and the second coating 32 is arranged on the lens assembly 1, and has a reflection characteristic for lasers within the second wavelength range, and has a transmission characteristic for other lasers outside the second wavelength range. The wavelength range formed by the first wavelength range and the second wavelength range includes: the wavelength range corresponding to the blue specific laser, the green specific laser and the red specific laser, that is, the wavelength range formed by the first wavelength range and the second wavelength range is the wavelength range corresponding to the blue specific laser, the green specific laser and the red specific laser.

[0052] According to design requirements, the first coating 31 and the second coating 32 can be arranged on any side of the lens assembly 1 as required, or even directly in the lens assembly 1. By arranging the first coating 31 on the lens assembly 1, it is possible to prevent the laser within the first wavelength range from damaging the image sensor 2. On this basis, the second coating 32 is further arranged to prevent the laser within the second wavelength range from damaging the image sensor 2. Thus, the camera module can prevent the blue specific laser, the green specific laser, and the red specific laser from damaging the image sensor 2.

[0053] Specifically, Fig. 9 and Fig.10As shown, holes are dug on the first coating 31 for wavelengths of 445nm, 520nm, and 638nm, that is, the 1nm width of the center corresponding to 445nm, 520nm, and 638nm on the first coating 31 is highly reflective. In this embodiment, a narrowband cutoff width of 1nm is selected to cut off lasers of a specific wavelength. The cutoff width is determined by comprehensively considering three factors: the amount of light entering, the difficulty of film system design, and the drift of laser wavelength. As a result, lasers with wavelengths of 444.5nm to 445.5nm, 519.5nm to 520.5nm, and 637.5nm-638.5nm are reflected, and at least the lasers with wavelengths of 400nm to 440nm, 449nm to 515nm, 524nm to 633nm, and 642nm to 700nm are guaranteed to be transmitted. Holes are dug on the second coating 32 for wavelengths of 450nm and 525nm, that is, a 1nm width of the center corresponding to 450nm and 525nm is set on the second coating 32 for high reflection. Thus, lasers with wavelengths of 449.5nm to 450.5nm and 524.5nm to 525.5nm are reflected, and at least 400nm to 445nm is transmitted, and lasers with wavelengths of 451nm to 520nm and 529nm to 700nm are transmitted.

[0054] In the camera module provided in this embodiment, when external laser passes through the lens assembly 1, the first coating 31 can reflect lasers with wavelengths of 444.5nm to 445.5nm, 519.5nm to 520.5nm, and 637.5nm-638.5nm, and transmit lasers with wavelengths of 400nm to 440nm, 449nm to 515nm, 524nm to 633nm, and 642nm to 700nm. On this basis, the second coating 32 reflects the lasers with wavelengths of 449.5nm to 450.5nm and 524.5nm to 525.5nm, so that the lasers with wavelengths of 440nm to 440nm, 451nm to 515nm, 529nm to 633nm and 642nm to 700nm are transmitted, so that the camera module can avoid the blue specific laser, the green specific laser and the red specific laser from causing damage to the image sensor 2. The total loss energy of the above five wavelengths generally accounts for no more than 3% of the entire 400-700 nanometer visible light band. Therefore, the impact on the overall light intake is very small.

[0055] In other embodiments, holes may be dug on the first coating 31 for wavelengths of 445nm and 520nm, and holes may be dug on the second coating 32 for wavelengths of 450nm, 525nm, and 638nm. That is, high reflection is achieved within a 1nm width of the center corresponding to 445nm and 520nm on the first coating 31, and high reflection is achieved within a 1nm width of the center corresponding to 450nm, 525nm, and 638nm on the second coating 32. The first coating 31 and the second coating 32 are used to prevent the image sensor 2 from being damaged by the laser.

[0056] Alternatively, holes are dug on the first coating 31 for wavelengths of 445nm, 525nm, and 638nm, and holes are dug on the second coating 32 for wavelengths of 450nm and 520nm. That is, high reflection occurs within a 1nm width of the center corresponding to 445nm, 525nm, and 638nm on the first coating 31. High reflection occurs within a 1nm width of the center corresponding to 450nm and 520nm on the second coating 32, and the first coating 31 and the second coating 32 prevent the laser from damaging the image sensor 2.

[0057] Alternatively, holes are dug on the first coating 31 for wavelengths of 445nm and 525nm, and holes are dug on the second coating 32 for wavelengths of 450nm, 520nm, and 638nm. That is, high reflection occurs within a 1nm width of the center corresponding to 445nm and 525nm on the first coating 31, and high reflection occurs within a 1nm width of the center corresponding to 450nm, 520nm, and 638nm on the second coating 32. The first coating 31 and the second coating 32 are used to prevent the image sensor 2 from being damaged by the laser.

[0058] like Figure 8 As shown, the lens assembly 1 includes: a lens 12. The camera module also includes a filter 10. The lens 12 includes at least one lens for collecting reflected light from an object to be illuminated, and generates high-intensity laser light when laser light is injected. The filter 10 is used to filter out infrared light beams. An image sensor 2 is provided on one side of the imaging end of the lens 12, and the filter 10 is arranged between the lens 12 and the image sensor 2.

[0059] The first coating 31 and the second coating 32 can be arranged at any position on the lens assembly 1 facing the incident light, so the first coating 31 can be arranged on the lens 12 or the filter 10, and the second coating 32 can be arranged on the lens 12 or the filter 10. As needed, the first coating 31 can be arranged at both ends of the lens 12 or the filter 10, or arranged in the lens 12 or the filter 10, and the second coating 32 can be arranged at both ends of the lens 12 or the filter 10, or arranged in the lens 12 or the filter 10. By arranging the first coating 31 and the second coating 32 on the lens 12 or the filter 10, it is possible to prevent the laser from causing damage to the image sensor 2.

[0060] Based on the above embodiment, the lens assembly further includes: a cover plate 11. The cover plate 11 is a protective structure on one side of the lens 12. The cover plate 11 is arranged on a side of the lens 12 away from the imaging end.

[0061] In this embodiment, the first coating 31 can be arranged on any structure of the lens 12, the filter 10 or the cover plate 11, and the second coating 32 can be arranged on any structure of the lens 12, the filter 10 or the cover plate 11. As required, the first coating 31 can be arranged at both ends of the cover plate 11, the lens 12 or the filter 10, or arranged in the cover plate 11, the lens 12 or the filter 10, and the second coating 32 can be arranged at both ends of the cover plate 11, the lens 12 or the filter 10, or arranged in the cover plate 11, the lens 12 or the filter 10. By arranging the first coating 31 and the second coating 32 on the cover plate 11, the lens 12 or the filter 10, it is possible to prevent the image sensor 2 from being damaged by the laser.

[0062] In order to simplify the coating process, based on the above embodiment, Fig.11 As shown, the filter coating structure 3 includes: a first coating 31, a second coating 32 and a third coating 33. The first coating 31 is arranged on the lens assembly, and the first coating 31 has a reflection characteristic for lasers within the first wavelength range, and has a transmission characteristic for other lasers outside the first wavelength range; the second coating 32 is located on one side of the first coating, and the second coating 32 is arranged on the lens assembly, and has a reflection characteristic for lasers within the second wavelength range, and has a transmission characteristic for other lasers outside the second wavelength range; the third coating 33 is located on one side of the first coating, and the third coating 33 is arranged on the lens assembly, and has a reflection characteristic for lasers within the third wavelength range, and has a transmission characteristic for other lasers outside the third wavelength range; the wavelength range formed by the first wavelength range, the second wavelength range and the third wavelength range includes: the wavelength range corresponding to the blue specific laser, the green specific laser and the red specific laser, that is, the wavelength range formed by the first wavelength range, the second wavelength range and the third wavelength range is the wavelength range corresponding to the blue specific laser, the green specific laser and the red specific laser.

[0063] According to design requirements, the first coating 31, the second coating 32 and the third coating 33 can be arranged on any side of the lens assembly 1 as required, or even directly arranged in the lens assembly 1. By arranging the first coating 31 on the lens assembly 1, it is possible to prevent the laser within the first wavelength range from damaging the image sensor 2, and by continuing to arrange the second coating 32, it is possible to prevent the laser within the second wavelength range from damaging the image sensor 2, and by continuing to arrange the third coating 33 on this basis, it is possible to prevent the laser within the third wavelength range from damaging the image sensor 2, so that the camera module can prevent the blue specific laser, the green specific laser and the red specific laser from damaging the image sensor 2.

[0064] Specifically, holes are dug and removed for wavelengths of 445nm and 520nm on the first coating 31, that is, the 1nm width of the center corresponding to 445nm and 520nm on the first coating 31 is highly reflective. As a result, lasers with wavelengths of 444.5nm to 445.5nm and 519.5nm to 520.5nm are reflected, and at least the lasers with wavelengths of 400nm to 440nm, 449nm to 515nm, and 524nm to 700nm are guaranteed to be transmitted. Holes are dug and removed for wavelengths of 450nm and 525nm on the second coating 32, that is, the 1nm width of the center corresponding to 450nm and 525nm on the second coating 32 is highly reflective. As a result, lasers with wavelengths of 449.5nm to 450.5nm and 524.5nm to 525.5nm are reflected, and at least the lasers with wavelengths of 400nm to 445nm are guaranteed to be transmitted, and the lasers with wavelengths of 451nm to 520nm and 529nm to 700nm are guaranteed to be transmitted. The third coating 33 is dug to remove the wavelength of 638nm, that is, the third coating 33 is highly reflective within a 1nm width corresponding to the center of 638nm. Thus, the laser with wavelengths of 637.5 to 638.5nm is reflected, and at least the laser with wavelengths of 400nm to 633nm and 642nm to 700nm are transmitted.

[0065] In the camera module provided in this embodiment, when external laser passes through the lens assembly 1, the first coating 31 can reflect lasers with wavelengths of 444.5nm to 445.5nm and 519.5nm to 520.5nm, and transmit lasers with wavelengths of 400nm to 440nm, 449nm to 515nm, and 524nm to 700nm. On this basis, the second coating 32 reflects lasers with wavelengths of 449.5nm to 450.5nm and 524.5nm to 525.5nm, thereby allowing lasers with wavelengths of 440nm to 440nm, 451nm to 515nm, and 529nm to 700nm to pass through. On this basis, the third coating 33 reflects lasers with wavelengths of 637.5 to 638.5nm, thereby allowing lasers with wavelengths of 440nm to 440nm, 451nm to 515nm, 529nm to 633nm, and 642nm to 700nm to pass through. The camera module can thus prevent the blue specific laser, the green specific laser, and the red specific laser from causing damage to the image sensor 2.

[0066] Accordingly, the first coating 31, the second coating 32 and the third coating 33 can all be arranged on any structure in which the first coating is arranged on the lens 12, the filter 10 or the cover plate 11. By arranging the first coating 31, the second coating 32 and the third coating 33 on the cover plate 11, the lens 12 or the filter 10, damage to the image sensor 2 caused by laser can be avoided.

[0067] In order to simplify the processing technology of the coating, more coatings can be further provided, for example, a first coating, a second coating, a third coating and a fourth coating, etc. can be provided at the same time. By providing all the coatings on the lens assembly 1, the camera module can ensure the laser shooting effect while fully reflecting the laser that can easily cause damage to the image sensor 2, thereby avoiding damage to the image sensor 2.

[0068] Based on the above embodiments, Fig.11 As shown, the first coating, the second coating and even the third coating can adopt a film stack design of 4, 6, and 8 cavity layers, and all include: a cavity layer 8 and a first refractive layer 6 and a second refractive layer 7 alternately stacked. The first refractive layer 6 and the second refractive layer 7 are both provided with multiple layers, and a film thickness coefficient of 0.6526 is adopted, and the cavity layer 8 is arranged between one of the adjacent first refractive layers 6 and the second refractive layer 7. The refractive index of the first refractive layer 6 is greater than the refractive index of the second refractive layer 7. The first refractive layer 6 includes: a tantalum pentoxide layer. The tantalum pentoxide layer adopts a high refractive film material Ta2O5, which increases the anti-laser threshold of the film layer. The second refractive layer 7 includes: a silicon dioxide layer. The silicon dioxide layer adopts a low refractive film material SiO2. The first coating and the second coating realize the cutoff of the red, green and blue laser beams by stacking high and low refractive indices, thereby reducing the influence of the laser on shooting.

[0069] When the laser is incident at an angle φ onto the cavity layer 8, the first refractive layer 6 and the second refractive layer 7, which are composed of multiple layers of different materials, and the laser is reflected multiple times at the interface between the layers, the phases can be consistent and the rates of the reflected light can be coherent, depending on the type and wavelength of the light source used and the optical thickness (the product of the refractive index and the geometric thickness) of each layer, thereby generating an interference effect between the layers. As a result, the first coating and the second coating have the reflection characteristics of the laser within a specific wavelength range, and have the transmission characteristics of other lasers outside the specific wavelength range.

[0070] The electronic device proposed in the embodiment of the present application can be a mobile phone, a tablet, a computer, an electronic watch, etc.

[0071] Take mobile phones as an example. Fig.12 As shown, the electronic device includes: a device body 9 and a camera module. The device body 9 is provided with a mounting groove, and the mounting groove has an opening. Figure 1As shown, the camera module includes: a lens assembly 1, an image sensor 2 and a filter coating structure 3. The image sensor 2 is located on one side of the imaging end of the lens assembly 1. The image sensor 2 is arranged in the mounting groove, and the lens assembly 1 is arranged at the opening. The filter coating structure 3 is arranged on the lens assembly 1, and the filter coating structure 3 has a reflection characteristic for lasers within a specific wavelength range, and has a transmission characteristic for other lasers outside the specific wavelength range, wherein the lasers within the specific wavelength range can damage the image sensor 2, thereby the camera module can ensure the laser shooting effect while fully reflecting the lasers that are easy to damage the image sensor 2, thereby avoiding damage to the image sensor 2.

[0072] After the filter coating structure 3 is set in the lens assembly 1 of the electronic device, when the external laser passes through the lens assembly 1, the filter coating structure 3 can fully reflect the laser that is likely to cause damage to the image sensor 2, and transmit other lasers, thereby ensuring the laser shooting effect and avoiding damage to the image sensor 2.

[0073] According to the electronic device of the embodiment of the present application, a filter coating structure 3 is provided on the lens assembly 1, and specific wavelengths on the filter coating structure 3 that are likely to cause damage to the image sensor 2 are specifically cleared, so that the filter coating structure 3 has a reflection characteristic for lasers in a specific wavelength range and a transmission characteristic for other lasers outside the specific wavelength range, so that the camera module can ensure the laser shooting effect while fully reflecting the lasers that are likely to cause damage to the image sensor 2, thereby avoiding damage to the image sensor 2.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A camera module, characterized in that: include: A lens assembly (1) and an image sensor (2), wherein the image sensor (2) is located on one side of the imaging end of the lens assembly (1); A filter coating structure (3) is arranged on the lens assembly (1), the filter coating structure (3) has a reflection characteristic for lasers within a specific wavelength range, the specific wavelength range includes: a wavelength range corresponding to a blue specific laser, a green specific laser and a red specific laser, the blue specific laser, the green specific laser and the red specific laser are lasers that are likely to cause damage to the image sensor, and has a transmission characteristic for other lasers outside the specific wavelength range; The light filtering coating structure (3) comprises: a first coating (31) and a second coating (32); The first coating (31) is arranged on the lens assembly (1), and has a reflection characteristic for laser light within a first wavelength range, and a transmission characteristic for other laser light outside the first wavelength range; The second coating (32) is located on one side of the first coating (31), is arranged on the lens assembly (1), and has a reflection characteristic for lasers within a second wavelength range, and a transmission characteristic for other lasers outside the second wavelength range; the wavelength range formed by the first wavelength range and the second wavelength range includes: the wavelength range corresponding to the blue specific laser, the green specific laser and the red specific laser; The blue specific laser includes: a first blue laser and a second blue laser; the green specific laser includes: a first green laser and a second green laser; the red specific laser includes: a first red laser; the wavelength range of the first blue laser includes: 445nm to 445.5nm; the wavelength range of the second blue laser includes: 449.5nm to 450.5nm; the wavelength range of the first green laser includes: 519.5nm to 520.5nm; the wavelength range of the second green laser includes: 524.5nm to 525.5nm; the wavelength range of the first red laser includes: 637.5nm to 638.5nm.

2. The camera module according to claim 1, characterized in that: The lens assembly (1) comprises: a lens (12); the camera module also comprises a filter (10); The image sensor (2) is provided on one side of the imaging end of the lens (12); the filter (10) is arranged between the lens (12) and the image sensor (2); The first coating (31) is arranged on the lens (12) or the optical filter (10); and the second coating (32) is arranged on the lens (12) or the optical filter (10).

3. The camera module according to claim 2, characterized in that: The lens assembly (1) further comprises: A cover plate (11) is arranged on a side of the lens (12) away from the imaging end; The first coating (31) is arranged on any structure of the lens (12), the optical filter (10) or the cover plate (11); and the second coating (32) is arranged on any structure of the lens (12), the optical filter (10) or the cover plate (11).

4. The camera module according to any one of claims 1 to 3, characterized in that: The light filter coating structure (3) comprises: A first coating (31) is arranged on the lens assembly (1) and has a reflection characteristic for laser light within a first wavelength range and a transmission characteristic for other laser light outside the first wavelength range; A second coating (32), located on one side of the first coating (31), is disposed on the lens assembly (1), and has a reflection characteristic for laser light within a second wavelength range, and a transmission characteristic for other laser light outside the second wavelength range; A third coating (33), located on one side of the first coating (31), is provided on the lens assembly (1), and has a reflection characteristic for lasers within a third wavelength range, and a transmission characteristic for other lasers outside the third wavelength range; The wavelength range formed by the first wavelength range, the second wavelength range and the third wavelength range includes: the wavelength range corresponding to the blue specific laser, the green specific laser and the red specific laser.

5. The camera module according to claim 2 or 3, characterized in that: The first coating film (31) and the second coating film (32) include: First refractive layers (6) and second refractive layers (7) that are alternately stacked; The cavity layer (8) is arranged between the adjacent first refractive layer (6) and the second refractive layer (7); the refractive index of the first refractive layer (6) is greater than the refractive index of the second refractive layer (7).

6. The camera module according to claim 5, characterized in that: The first refractive layer (6) comprises a tantalum pentoxide layer; and the second refractive layer (7) comprises a silicon dioxide layer.

7. An electronic device, characterized in that: include: The device body (9) is provided with a mounting groove, wherein the mounting groove has an opening; According to the camera module as described in any one of claims 1 to 6, the image sensor (2) is arranged in the mounting groove, and the lens assembly (1) is arranged in the opening.

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