Anti-reflection film, optical conduction assembly, camera module and electronic equipment

Abstract

The invention relates to an antireflection film, an optical conduction assembly, a camera module and electronic equipment. The antireflection film is provided with a light inlet side and a light outlet side and comprises a first mixture film layer, a metal film layer, a second mixture film layer and an inorganic compound film layer which are sequentially stacked in the direction from the light inlet side to the light outlet side. The first mixture film layer and the second mixture film layer are made of aluminum oxide-praseodymium oxide mixed oxide. According to the antireflection film, the materials and the arrangement of the film layers are designed, so that the film layers can be matched with one another, the transmittance of the antireflection film is effectively improved, the reflectivity of the antireflection film is reduced, and the spectral bandwidth of the antireflection film is widened.

Description

Technical Field

[0001] The present application relates to the technical field of camera equipment, and in particular to an anti-reflection film, an optical transmission component, a camera module and an electronic device. Background Art

[0002] Camera modules with a periscope design usually use prisms, reflectors and other components to transmit light through one or more reflections to achieve the effect of folding the light path, so as to compress the space occupied by the camera module in the electronic device, which is conducive to the thin design of the electronic device. However, since the light is reflected multiple times in the camera module with a periscope design, serious stray light is easily generated during the transmission process, resulting in fogging of the imaging screen and other phenomena, affecting the imaging quality of the camera module. Summary of the invention

[0003] The embodiments of the present application provide an anti-reflection film, an optical transmission component, a camera module and an electronic device to solve the problem of stray light affecting the imaging quality in the current periscope camera module.

[0004] An anti-reflection film has a light incident side and a light emitting side, the anti-reflection film comprising a first mixture film layer, a metal film layer, a second mixture film layer and an inorganic compound film layer stacked in sequence in a direction from the light incident side to the light emitting side, the material of the first mixture film layer and the second mixture film layer comprising aluminum oxide-praseodymium oxide mixed oxide.

[0005] An optical transmission component includes a first prism, a second prism and an anti-reflection film as described above, wherein the first prism has a first light-emitting surface, the second prism has a second light-entering surface opposite to the first light-emitting surface, the anti-reflection film is arranged between the first light-emitting surface and the second light-entering surface, and at least part of the light emitted from the first prism from the first light-emitting surface can pass through the anti-reflection film and enter the second prism from the second light-entering surface.

[0006] A camera module comprises a lens, an image sensor and the above-mentioned optical transmission component, wherein the lens is opposite to the first light emitting surface, and the optical transmission component is used to transmit at least part of the light emitted by the lens to the image sensor.

[0007] An electronic device comprises the camera module as described above.

[0008] The anti-reflection film, through the design of the material and arrangement of each film layer, enables each film layer to cooperate with each other, effectively improves the transmittance of the anti-reflection film, reduces the reflectivity of the anti-reflection film, and is conducive to broadening the spectral bandwidth of the anti-reflection film, so that the anti-reflection film can play an anti-reflection role for light of different bands. When used in the optical path, it is conducive to improving the transmittance of light, reducing the probability of light reflecting on the anti-reflection film to generate stray light, and at the same time improving the efficiency of light utilization, thereby helping to improve the imaging quality. In addition, through the reasonable design of each film layer, while achieving anti-reflection, it is also conducive to compressing the thickness of the anti-reflection film, thereby helping to reduce the space occupied by the anti-reflection film in the optical path. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 Schematic diagram of the structure of electronic equipment in some embodiments.

[0011] Figure 2 Schematic diagram of the structure of the camera module in some embodiments.

[0012] Figure 3 for Figure 2 A partial enlarged schematic diagram of the camera module shown.

[0013] Figure 4 for Figure 2 Another partially enlarged schematic diagram of the camera module shown.

[0014] Figure 5 Schematic cross-sectional view of an anti-reflection film in some embodiments.

[0015] Figure 6 Schematic diagram of the optical admittance of anti-reflection films in some embodiments.

[0016] Figure 7 Schematic diagram of the relationship between metal materials, refractive index and extinction coefficient in some embodiments.

[0017] Figure 8 FIG. 4 is a graph showing the reflectivity and wavelength of an anti-reflection film in some embodiments.

[0018] Fig. 9 FIG. 4 is a graph showing the transmittance of an anti-reflection film and wavelength in some embodiments.

[0019] Fig.10This is a schematic diagram of the structure in which the electronic device further includes other components in some embodiments.

[0020] Reference numerals:

[0021] 10. Electronic device; 11. Shell; 111. Light inlet; 20. Camera module; 21. Lens; 22. Image sensor; 30. Optical transmission component; 31. First prism; 311. First light incident surface; 312. First light emitting surface; 313. First reflection surface; 32. Second prism; 321. Second light incident surface; 322. Second light emitting surface; 323. Second reflection surface; 33. Third prism; 331. Third light incident surface; 332. Third light emitting surface; 333. Third reflection surface; 34. Anti-reflection film; 341. First mixture film layer; 342. Metal film layer; 343. Second mixture film layer; 344. Inorganic compound film layer; 35. Adhesion structure. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0023] As used herein, "electronic device" refers to a device that can receive and / or send communication signals, including but not limited to a device that is connected via any one or more of the following connection methods:

[0024] (1) Connection via wired lines, such as Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, and direct cable connection;

[0025] (2) Via wireless interfaces, such as cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, and AM-FM broadcast transmitters.

[0026] An electronic device configured to communicate via a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0027] (1) Satellite phone or cellular phone;

[0028] (2) Personal Communications System (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communications capabilities;

[0029] (3) Radiotelephone, pager, Internet / Intranet access, Web browser, notepad, calendar, Personal Digital Assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0030] (4) conventional laptop and / or handheld receivers;

[0031] (5) Conventional laptop and / or palmtop radiotelephone transceivers, etc.

[0032] See also Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The schematic diagrams of the structures of the electronic device 10 and the camera module 20 in some embodiments of the present application are shown respectively. The electronic device 10 provided in the present application includes but is not limited to a smart phone, a tablet computer, an e-reader, etc. The electronic device 10 includes a housing 11 and a camera module 20 disposed in the housing 11. The housing 11 is provided with a light inlet 111, and the camera module 20 includes a lens 21, an image sensor 22 and an optical transmission component 30. The lens 21 is opposite to the light inlet 111 and can collect ambient light through the light inlet 111. The optical transmission component 30 can transmit at least part of the light collected and adjusted by the lens 21 to the image sensor 22. The image sensor 22 is used to convert the received light signal into an electrical signal and transmit it to the central processor of the electronic device 10, or a chip in the electronic device 10 specifically used for image processing, so that the electronic device 10 can realize the camera function. The lens 21 may include one or more lenses with optical focal length, and the light entering the lens 21 from the light inlet 111 can be emitted after being adjusted by each lens of the lens 21 in sequence. The image sensor 22 includes but is not limited to a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0033] refer to Figure 2As shown, in some embodiments, the light is emitted after being reflected once or multiple times in the optical transmission component 30, that is, the optical transmission component 30 can also change the transmission path of the light in the process of transmitting the light, so as to achieve the effect of folding the light path, which is beneficial to compressing the occupied space of the camera module 20. In some embodiments, the optical transmission component 30 includes a first prism 31 and a second prism 32, the first prism 31 has a first light incident surface 311 and a first light emitting surface 312, the second prism 32 has a second light incident surface 321 and a second light emitting surface 322, the first light emitting surface 312 and the second light incident surface 321 are arranged opposite to each other and spaced apart, and at least part of the light incident on the first prism 31 from the first light incident surface 311 can be incident on the second prism 32 via the first light emitting surface 312 and the second light incident surface 321 in sequence.

[0034] Furthermore, combined with Figure 2 and Figure 3 As shown, in some embodiments, the optical transmission component 30 further includes an anti-reflection film 34, and the anti-reflection film 34 is disposed between the first light emitting surface 312 and the second light incident surface 321. At least part of the light emitted from the first prism 31 from the first light emitting surface 312 can pass through the anti-reflection film 34 and enter the second prism 32 from the second light incident surface 321. It can be understood that the anti-reflection film 34 is disposed in the optical transmission component 30, and the light will pass through the anti-reflection film 34 during the process of being transmitted from the first prism 31 to the second prism 32. The anti-reflection film 34 can improve the transmittance of the light emitted from the first prism 31 to the second prism 32 and reduce the reflectivity of the light, thereby facilitating the reduction of the generation of stray light in the optical transmission component 30 and improving the imaging quality of the camera module 20.

[0035] Combination Figure 2 and Figure 4As shown, in some embodiments, the optical transmission component 30 further includes a third prism 33, the third prism 33 has a third light incident surface 331 and a third light emitting surface 332, the third light incident surface 331 and the second light emitting surface 322 are arranged opposite to each other and spaced apart, at least part of the light emitted from the second light emitting surface 322 of the second prism 32 can enter the third prism 33 from the third light incident surface 331, and be emitted from the third prism 33. The optical transmission component 30 is provided with two anti-reflection films 34, one of the anti-reflection films 34 is arranged between the first light emitting surface 312 and the second light incident surface 321, and the other anti-reflection film 34 is arranged between the second light emitting surface 322 and the third light incident surface 331, at least part of the light emitted from the second light emitting surface 322 can pass through the anti-reflection film 34 and then enter the third prism 33 from the third light incident surface 331. Two anti-reflection films 34 are provided in the optical transmission component 30, which can effectively improve the transmittance of light in the first prism 31 and the second prism 32, and between the second prism 32 and the third prism 33, and reduce the reflectivity of light, thereby effectively reducing the generation of stray light in the optical transmission component 30, which is beneficial to improving the imaging quality of the camera module 20.

[0036] Please see again Figure 2 As shown, in some embodiments, the first light emitting surface 312 and the second light incident surface 321 are both inclined to the first light incident surface 311, the second light emitting surface 322 and the third light incident surface 331 are both inclined to the first light incident surface 311 and the third light emitting surface 332, and the light is reflected at least once in the first prism 31, the second prism 32 and the third prism 33 before being emitted. It can be understood that after the light is reflected at least once in the first prism 31 and the second prism 32, it will be incident on the first light emitting surface 312 and the second light incident surface 321. Since the first light emitting surface 312 and the second light incident surface 321 are inclined to the first light incident surface 311, and the second light emitting surface 322 and the third light incident surface 331 are inclined to the first light incident surface 311 and the third light emitting surface 332, the incident angle of the stray light on the first light emitting surface 312 and the second light emitting surface 322 is large, and it is easily reflected by the first light emitting surface 312 and the second light emitting surface 322 and cannot continue to be transmitted, which is beneficial to reducing the stray light. The incident angle of the imaging light on the first light emitting surface 312 and the second light emitting surface 322 is usually small. With the setting of the anti-reflection film 34, the transmittance of the imaging light can be effectively improved, the reflectivity of the light can be reduced, the probability of the imaging light being reflected and generating stray light can be reduced, and the imaging quality and light utilization efficiency of the optical transmission component 30 can be improved. Therefore, the anti-reflection film 34 is arranged between two adjacent prisms in the optical transmission component 30 , and combined with the design of the prisms in the optical transmission component 30 , stray light can be effectively suppressed and eliminated, thereby improving light utilization efficiency and imaging quality.

[0037] Further, in some embodiments, the first prism 31 further has a first reflection surface 313 inclined at the first light incident surface 311, the second prism 32 further has a second reflection surface 323 parallel to the first light incident surface 311, and the third prism 33 further has a third reflection surface 333 inclined at the third light emitting surface 332, and the first light incident surface 311 and the third light emitting surface 332 are parallel. In the direction from the first light incident surface 311 to the third light emitting surface 332, the first reflection surface 313, the first light emitting surface 312, the second light incident surface 321, the second light emitting surface 322, the third light incident surface 331 and the third reflection surface 333 are arranged in sequence. The first light incident surface 311, the first light emitting surface 312 and the first reflection surface 313 may be connected in sequence, the second light incident surface 321, the second reflection surface 323 and the second light emitting surface 322 may be connected in sequence, and the third light incident surface 331, the third light emitting surface 332 and the third reflection surface 333 may be connected in sequence.

[0038] At least part of the light incident on the first prism 31 from the first light incident surface 311 can be reflected by the first reflecting surface 313 to the first light incident surface 311, and then emitted from the first light emitting surface 312 after being reflected by the first light incident surface 311. At least part of the light incident on the second prism 32 from the second light incident surface 321 can be reflected by the second reflecting surface 323 to the second light emitting surface 322. At least part of the light incident on the third prism 33 from the third light incident surface 331 can be reflected by the third light emitting surface 332 to the third reflecting surface 333, and then emitted from the third light emitting surface 332 after being reflected by the third reflecting surface 333. In this embodiment, the lens 21 of the camera module 20 is opposite to the first light incident surface 311 of the first prism 31, and the image sensor 22 is opposite to the third light emitting surface 332 of the third prism 33. The light emitted by the lens 21 can enter the first prism 31 from the first light incident surface 311, and is transmitted through five reflections in the optical transmission component 30 and emitted from the third light emitting surface 332 to the image sensor 22. Therefore, through the reasonable design of the structure of the three prisms, the light can be reflected five times in the optical transmission component 30, effectively extending the transmission path of the light in the optical transmission component 30, effectively achieving the effect of folding the light path, adapting to the telephoto design of the lens 21, and at the same time helping to compress the occupied space of the camera module 20. In addition, by Figure 2It can also be seen from the transmission path of the imaging light that the first light emitting surface 312 and the second light emitting surface 322 are inclined to the first light incident surface 311, and the design that the first light emitting surface 312 and the first light incident surface 311 form an acute angle, and the second light emitting surface 322 and the first light incident surface 311 form an obtuse angle can be coordinated with the design of the five-reflection transmission path of the optical transmission component 30, so that the incident angle of stray light on the first light emitting surface 312 and the second light emitting surface 322 is larger, and can be reflected and reduced, and the main light of the imaging light can be roughly vertically incident when it is incident on the first light emitting surface 312, the second light incident surface 321, the second light emitting surface 322 and the third light incident surface 331. Combined with the anti-reflection film 34's anti-transmission and anti-reflection effects on light, the generation of stray light can be effectively suppressed, and the imaging quality of the camera module 20 is improved.

[0039] In some embodiments, the angle between the first light incident surface 311 and the first reflection surface 313, and the angle between the third light emitting surface 332 and the third reflection surface 333 are 27°-33°, the angle between the first light emitting surface 312 and the first light incident surface 311 is 30°-45°, and the acute angle between the second light emitting surface 322 and the plane where the first light incident surface 311 is located can also be 30°-45°, so as to adapt to the conduction path of the imaging light, effectively form a folded light path with five reflections, and adjust the incident angles of stray light and imaging light on the first light emitting surface 312 and the second light emitting surface 322, thereby facilitating the suppression of stray light and the transmittance-enhancing and reflection-reducing effects of imaging light.

[0040] Combination Figure 2 and Figure 5 As shown, in some embodiments, the anti-reflection film 34 used in the optical transmission component 30 has a light incident side and a light emitting side. The light incident side of the anti-reflection film 34 disposed between the first light emitting surface 312 and the second light incident surface 321 faces the first light emitting surface 312, and the light emitting side faces the second light incident surface 321. The light incident side of the anti-reflection film 34 disposed between the second light emitting surface 322 and the third light incident surface 331 faces the second light emitting surface 322, and the light emitting side faces the third light incident surface 331. The anti-reflection film 34 includes a first mixture film layer 341, a metal film layer 342, a second mixture film layer 343, and an inorganic compound film layer 344, which are sequentially stacked in a direction from the light incident side to the light emitting side. The materials of the first mixture film layer 341 and the second mixture film layer 343 are aluminum oxide-praseodymium oxide mixed oxide, and the materials of the metal film layer 342 and the inorganic compound film layer 344 are any applicable metal and inorganic compound, respectively.

[0041] The anti-reflection film 34 is designed with materials and arrangement of each film layer, so that each film layer can cooperate with each other, effectively improve the transmittance of the anti-reflection film 34, reduce the reflectivity of the anti-reflection film 34, and is conducive to broadening the spectral bandwidth of the anti-reflection film 34, so that the anti-reflection film 34 can play an anti-reflection role for light of different wavelengths, and is used in the optical path to improve the transmittance of light, reduce the probability of light reflecting on the anti-reflection film 34 to generate stray light, and improve the efficiency of light utilization, thereby helping to improve imaging quality. In addition, through the reasonable design of each film layer, while achieving anti-reflection, it is also conducive to compressing the thickness of the anti-reflection film 34, thereby helping to reduce the space occupied by the anti-reflection film 34 in the optical path.

[0042] In some embodiments, the material of the metal film layer 342 includes silver (Ag) or gold (Au), and the material of the inorganic compound film layer 344 includes magnesium fluoride or silicon oxide. Silver or gold with a small extinction coefficient K and a small refractive index is used as the material of the metal layer, and aluminum oxide (Al2O3)-praseodymium oxide (Pr6O 11 ) mixture and magnesium fluoride (MgM2) or silicon oxide (SiO2), which can reasonably match the film material and arrangement of the anti-reflection film 34, is beneficial to improving the transmittance of the anti-reflection film 34 to light, reducing the reflectivity of light, and widening the spectral bandwidth of the anti-reflection film 34.

[0043] In some embodiments, the equivalent refractive index of the first mixture film layer 341 and the second mixture film layer 343 is 1.54-1.88, for example, 1.71, so that the first mixture film layer 341 and the second mixture film layer 343 can form a good match with other film layers, and improve the anti-reflection effect of the anti-reflection film 34 on light. In some embodiments, in the first mixture film layer 341 and the second mixture film layer 343, the mass fraction ratio of aluminum oxide and praseodymium oxide is 90%:10%. To meet this mass fraction ratio, the equivalent refractive index of the first mixture film layer 341 and the second mixture film layer 343 is 1.67*90%+2.05*10%=1.71, which can form a good match with other film layers and improve the anti-reflection effect of the anti-reflection film 34 on light.

[0044] In some embodiments, the thickness of the inorganic compound film layer 344, the first mixture film layer 341, the second mixture film layer 343 and the metal film layer 342 decreases in sequence. In this way, the first mixture film layer 341 and the inorganic compound film layer 344 are the outermost layer structures on both sides of the anti-reflection film 34, and have sufficient thickness to improve the structural strength of the anti-reflection film 34, improve the structural stability of the anti-reflection film 34, and at the same time enable each film layer to form a good match and fully transmit light, thereby improving the anti-reflection effect of the anti-reflection film 34. For example, in some embodiments, the thickness of each film layer in the anti-reflection film 34 satisfies the following Table 1. In the embodiment shown in Table 1, the material of the metal film layer 342 is silver, the material of the inorganic compound film layer 344 is magnesium fluoride, and MX1 represents an aluminum oxide-praseodymium oxide mixed oxide. Of course, the thickness of each film layer is not limited to this, as long as the anti-reflection effect can be achieved.

[0045] Table 1

[0046]

[0047] Combination Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the surface of the anti-reflection film 34 facing the light incident side and the surface facing the light emitting side are used to contact the medium located on the light incident side and the medium located on the light emitting side, respectively, and the refractive index of the medium located on the light incident side is greater than the refractive index of the medium located on the light emitting side. For example, in the embodiment shown in Table 1, the medium on the light incident side of the anti-reflection film 34 is made of glass material with a refractive index of 1.52, such as H-k9L glass, and the medium on the light emitting side is air. With such a configuration, the anti-reflection film 34 can form a good match with the medium on the light incident side and the light emitting side, which is conducive to improving the anti-transmission and anti-reflection effect of the anti-reflection film 34. Of course, the refractive index of the glass material of the prism is not limited to the description of this application, and can also be any applicable value of 1.6 to 2.2.

[0048] For example, in some embodiments, for the anti-reflection film 34 disposed between the first light emitting surface 312 and the second light incident surface 321, the anti-reflection film 34 is disposed on the first light emitting surface 312 and forms an air gap with the second light incident surface 321, so that the light incident side medium of the anti-reflection film 34 is a prism, and the light emitting side medium is air, which is conducive to improving the anti-transmission and anti-reflection effects of the anti-reflection film 34. In some embodiments, the optical transmission component 30 further includes a shading member (not shown), the shading member includes but is not limited to any applicable shading structure such as ink, silk screen or shading medium film, and the shading member is disposed between the first light emitting surface 312 and the second light incident surface 321 and is disposed around the anti-reflection film 34. Thus, the imaging light incident on the first light emitting surface 312 at a position corresponding to the anti-reflection film 34 can pass through the anti-reflection film 34 and incident on the second light incident surface 321. The anti-reflection film 34 can improve the transmittance of the imaging light and reduce the risk of the imaging light being reflected on the first light emitting surface 312 to form stray light. The stray light incident on the area outside the first light emitting surface 312 corresponding to the anti-reflection film 34 can be absorbed by the shading element, which is beneficial to improving the stray light reduction effect of the optical transmission component 30, thereby helping to improve the imaging quality of the optical transmission component 30.

[0049] In some embodiments, the first prism 31 and the second prism 32 are glued together by an adhesive structure 35 located between the first light-emitting surface 312 and the second light-entering surface 321, and the adhesive structure 35 includes but is not limited to optical adhesive. For example, the adhesive structure 35 can be arranged around the anti-reflection film 34 so that an air gap can be formed between the anti-reflection film 34 and the second light-entering surface 321, and the light shielding member can be stacked with the adhesive structure 35. It can be understood that the optical transmission component 30 can be split into two glued first prisms 31 and second prisms 32 by splitting a prism into two glued first prisms 31 and second prisms 32, so that the light shielding member and the anti-reflection film 34 are arranged at the glued gap between the first prism 31 and the second prism 32, while eliminating stray light and improving the light utilization rate of imaging light, and will not increase the occupied space of the optical transmission component 30, thereby facilitating the thin design of the electronic device 10. Of course, the arrangement of the media on both sides of the anti-reflection film 34 between the second light emitting surface 322 and the third light incident surface 331 can also be obtained by referring to the above records. At the same time, the gap between the second prism 32 and the third prism 33 can also be provided with a shading member and an adhesion structure 35. The specific arrangement can also be obtained by referring to the above records, which will not be elaborated here.

[0050] It can be understood that when the media on both sides of the anti-reflection film 34 are glass prisms and air respectively, the initial value of the optical admittance of the anti-reflection film 34 is the glass prism. After passing through four layers of film, the refractive index returns to the refractive index of air, and a lower reflectivity can be obtained. According to the design principle of optical admittance, the anti-reflection film 34 can be represented by an equivalent interface. The reflection, transmission and phase characteristics of the anti-reflection film 34 are determined by the admittance of the incident medium and the combined admittance of the equivalent interface. In the anti-reflection film 34, the effect of any layer of the film can be regarded as changing the optical properties of the anti-reflection film 34. The admittance trajectory of the anti-reflection film 34 is composed of a series of circles or arcs connected head to tail. Each arc corresponds to a different film layer, and the admittance circle is traced in the clockwise direction. Please refer to Figure 6 As shown, Figure 6 The optical admittance of the anti-reflection film 34 in the embodiment corresponding to Table 1 is shown. It can be seen that the reasonable combination of the film layer structure of the anti-reflection film 34 and the media on both sides can effectively improve the transmittance of the anti-reflection film 34 to light and reduce the reflectivity of the anti-reflection film 34 to light.

[0051] Furthermore, the reflectivity of the opaque metal film layer 342 at vertical incidence in air satisfies:

[0052]

[0053] It can be seen that according to the principle of optical admittance, the transmittance of the metal film layer 342 is proportional to the extinction coefficient of the metal material, and the smaller the refractive index of the metal material, the higher the transmittance. Figure 7 It can be seen that the anti-reflection film 34 of the present application adopts silver or gold material with a small refractive index and a small extinction coefficient. Combined with the design of each film layer in the anti-reflection film 34 and the matching of the media on both sides, it can effectively improve the transmittance of the anti-reflection film 34 to light and reduce the reflectivity of the anti-reflection film 34 to light.

[0054] Combination Figure 8 and Fig. 9 As shown, Figure 8 , which is a graph showing the reflectivity and wavelength of the anti-reflection film 34 in the embodiment corresponding to Table 1 of the present application and the conventional anti-reflection film, Fig. 9 The graphs of transmittance and wavelength of the anti-reflection film 34 in the embodiment corresponding to Table 1 of the present application and the conventional anti-reflection film are shown. Figure 8 and Fig. 9 The curve with a thinner line width represents a conventional anti-reflection film, and the curve with a thicker line width represents the anti-reflection film 34 in the embodiment corresponding to Table 1 of the present application. Figure 8 and Fig. 9It can be seen that the anti-reflection film 34 provided in some embodiments of the present application has a maximum reflectivity of 0.92%@800nm ​​in the range of 400nm-800nm, an average reflectivity of 0.3%, a maximum transmittance of 99.3%@500nm in the range of 400nm-800nm, and an average transmittance of 98.8%. The traditional anti-reflection film has a maximum reflectivity of 3.08@800nm ​​in the range of 400nm-800nm, an average reflectivity of 0.43%, a maximum transmittance of 99.99%@411nm in the range of 400nm-800nm, and an average transmittance of 99.6%. It can be seen that the anti-reflection film 34 provided in the present application can effectively improve the transmittance and spectral bandwidth of the anti-reflection film 34 and reduce the reflectivity of the anti-reflection film 34 through the design of each film layer and the matching of the media on both sides.

[0055] It should be noted that in Figure 2 In the illustrated embodiment, by splitting the optical transmission component 30 into a first prism 31, a second prism 32, and a third prism 33 that are glued together, and providing an anti-reflection film 34 between the first prism 31 and the second prism 32, and between the second prism 32 and the third prism 33, the light utilization efficiency of the optical transmission component 30 can be improved without increasing the occupied space of the optical transmission component 30, and the stray light in the optical transmission component 30 can be eliminated, thereby facilitating the improvement of the imaging brightness and imaging quality of the camera module 20. However, the transmission path of the light in the optical transmission component 30, the number of reflections, and the number of prisms are not limited to Figure 2 As long as an anti-reflection film 34 can be set between two adjacent prisms to play the role of increasing transmission and reducing reflection, in other embodiments, the anti-reflection film 34 can also be used to be set on any other applicable optical element such as a lens to play the role of increasing transmission and reducing reflection, suppressing the stray light of the optical element and improving the efficiency of light utilization. Of course, the anti-reflection film 34 in the optical transmission component 30 provided in the present application is not limited to the description of the present application, and any other applicable anti-reflection film 34 can also be used. The prisms involved in the present application include but are not limited to optical elements made of plastic or glass. The material and refractive index of each prism can be the same or different, which will not be repeated in the present application.

[0056] refer to Fig.10 , Fig.10The electronic device 10 is a schematic diagram of the structure of the electronic device 10 provided in the embodiment of the present application. The electronic device 10 may include a radio frequency (RF) circuit 501, a memory 502 including one or more computer-readable storage media, an input unit 503, a display unit 504, a sensor 505, an audio circuit 506, a wireless fidelity (WiFi) module 507, a processor 508 including one or more processing cores, and a power supply 509. Those skilled in the art will understand that Fig.10 The structure of the electronic device 10 shown in the figure does not constitute a limitation on the electronic device 10, and the electronic device 10 may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0057] The radio frequency circuit 501 can be used to send and receive information, or receive and send signals during a call. In particular, after receiving the downlink information of the base station, it is handed over to one or more processors 508 for processing; in addition, the data related to the uplink is sent to the base station. Generally, the radio frequency circuit 501 includes but is not limited to an antenna, at least one amplifier, a tuner, one or more oscillators, a subscriber identity module (SIM) card, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc. In addition, the radio frequency circuit 501 can also communicate with the network and other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to the Global System of Mobile Communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), etc.

[0058] The memory 502 can be used to store applications and data. The applications stored in the memory 502 contain executable codes. The applications can form various functional modules. The processor 508 executes various functional applications and data processing by running the applications stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the electronic device 10 (such as audio data, a phone book, etc.), etc. In addition, the memory 502 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 502 can also include a memory controller to provide the processor 508 and the input unit 503 with access to the memory 502.

[0059] The input unit 503 can be used to receive input digital, character information or user feature information (such as fingerprints), and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control. Specifically, in a specific embodiment, the input unit 503 may include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display screen or a touch pad, can collect user touch operations on or near it (such as operations performed by users using fingers, styluses, or any other suitable objects or accessories on or near the touch-sensitive surface), and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface may include a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into touch point coordinates, and then sends it to the processor 508, and can receive and execute commands sent by the processor 508.

[0060] The display unit 504 can be used to display information input by the user or information provided to the user and various graphical user interfaces of the electronic device 10, which can be composed of graphics, text, icons, videos and any combination thereof. The display unit 504 may include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD, Liquid Crystal Display), an organic light-emitting diode (OLED, Organic Light-Emitting Diode), etc. Further, the touch-sensitive surface may cover the display panel, and when the touch-sensitive surface detects a touch operation on or near it, it is transmitted to the processor 508 to determine the type of touch event, and then the processor 508 provides a corresponding visual output on the display panel according to the type of touch event. Although in Fig.10 In the embodiment, the touch-sensitive surface and the display panel are used as two independent components to realize input and output functions, but in some embodiments, the touch-sensitive surface and the display panel can be integrated to realize input and output functions.

[0061] The electronic device 10 may also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel according to the brightness of the ambient light, and the proximity sensor may turn off the display panel and / or backlight when the electronic device 10 is moved to the ear. As a type of motion sensor, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that can also be configured in the electronic device 10, they will not be repeated here.

[0062] The audio circuit 506 can provide an audio interface between the user and the electronic device 10 through a speaker and a microphone. The audio circuit 506 can convert the received audio data into an electrical signal, transmit it to the speaker, and convert it into a sound signal for output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit 506 and converted into audio data, and then the audio data is output to the processor 508 for processing, and then sent to another electronic device 10 through the radio frequency circuit 501, or the audio data is output to the memory 502 for further processing. The audio circuit 506 may also include an earphone socket to provide communication between an external earphone and the electronic device 10.

[0063] Wireless Fidelity (WiFi) is a short-range wireless transmission technology. The electronic device 10 can help users send and receive emails, browse web pages, and access streaming media through the wireless fidelity module 507, which provides users with wireless broadband Internet access. Fig.10 The wireless fidelity module 507 is shown, but it is understandable that it is not a necessary component of the electronic device 10 and can be omitted as needed without changing the essence of the invention.

[0064] The processor 508 is the control center of the electronic device 10. It uses various interfaces and lines to connect various parts of the entire electronic device 10. By running or executing applications stored in the memory 502 and calling data stored in the memory 502, it executes various functions of the electronic device 10 and processes data, thereby monitoring the electronic device 10 as a whole. Optionally, the processor 508 may include one or more processing cores; preferably, the processor 508 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 508.

[0065] The electronic device 10 also includes a power supply 509 for supplying power to various components. Preferably, the power supply 509 can be logically connected to the processor 508 through a power management system, so that the power management system can manage charging, discharging, and power consumption. The power supply 509 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0066] although Fig.10 Not shown, the electronic device 10 may also include a Bluetooth module, etc., which will not be described in detail here. In specific implementation, the above modules can be implemented as independent entities, or can be arbitrarily combined and implemented as the same or several entities. The specific implementation of the above modules can refer to the previous method embodiment, which will not be described in detail here.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An anti-reflection film, characterized in that: It has a light incident side and a light emitting side, and the anti-reflection film includes a first mixture film layer, a metal film layer, a second mixture film layer and an inorganic compound film layer which are stacked in sequence in a direction from the light incident side to the light emitting side, and the material of the first mixture film layer and the second mixture film layer includes aluminum oxide-praseodymium oxide mixed oxide.

2. The anti-reflection film according to claim 1, characterized in that: The material of the metal film layer includes silver or gold.

3. The anti-reflection film according to claim 1, characterized in that: The material of the inorganic compound film layer includes magnesium fluoride or silicon oxide.

4. The anti-reflection film according to claim 1, characterized in that: The equivalent refractive index of the first mixture film layer and the second mixture film layer is 1.54-1.

88.

5. The anti-reflection film according to claim 4, characterized in that: In the first mixture film layer and the second mixture film layer, the mass fraction ratio of aluminum oxide to praseodymium oxide is 90%:10%.

6. The anti-reflection film according to claim 1, characterized in that: The thicknesses of the inorganic compound film layer, the first mixture film layer, the second mixture film layer and the metal film layer decrease in sequence.

7. The anti-reflection film according to claim 1, characterized in that: The surface of the anti-reflection film facing the light incident side and the surface facing the light emitting side are respectively used to contact the medium located at the light incident side and the medium located at the light emitting side, and the refractive index of the medium located at the light incident side is greater than the refractive index of the medium located at the light emitting side.

8. An optical transmission component, characterized in that: The invention comprises a first prism, a second prism and an anti-reflection film as described in any one of claims 1 to 7, wherein the first prism has a first light-emitting surface, the second prism has a second light-incident surface opposite to the first light-emitting surface, the anti-reflection film is arranged between the first light-emitting surface and the second light-incident surface, and at least part of the light emitted from the first prism from the first light-emitting surface can pass through the anti-reflection film and enter the second prism from the second light-incident surface.

9. The optical transmission component according to claim 8, characterized in that: The first light emitting surface and the second light incident surface are arranged at intervals, and the anti-reflection film is arranged on the first light emitting surface and forms an air gap between the first light emitting surface and at least a portion of the second light incident surface.

10. The optical transmission component according to claim 8, characterized in that The first prism and the second prism are glued together via an adhesive structure located between the first light-emitting surface and the second light-incident surface.

11. The optical transmission component according to claim 8, characterized in that: The optical transmission component further includes a shading member, which is disposed between the first light emitting surface and the second light incident surface and surrounds the anti-reflection film.

12. The optical transmission component according to claim 8, characterized in that The optical transmission component further includes a third prism, the first prism further includes a first light incident surface, the second prism further includes a second light emitting surface, the third prism includes a third light incident surface and a third light emitting surface, the third light incident surface and the second light emitting surface are arranged opposite to each other, the first light emitting surface and the second light incident surface are both inclined to the first light incident surface, the second light emitting surface and the third light incident surface are both inclined to the first light incident surface and the third light emitting surface, and the optical transmission component includes two anti-reflection films, the two anti-reflection films are respectively arranged between the first light emitting surface and the second light incident surface, and between the second light emitting surface and the third light incident surface; At least part of the light incident on the first prism from the first light incident surface is reflected at least once in the first prism, and then passes through the anti-reflection film and enters the second prism from the first light exiting surface and the second light incident surface; at least part of the light incident on the second prism is reflected at least once in the second prism, and then exits the second prism from the second light exiting surface, passes through the anti-reflection film and enters the third prism from the third light incident surface; at least part of the light incident on the third prism is reflected at least once in the third prism, and then exits the third prism from the third light exiting surface.

13. The optical transmission component according to claim 12, characterized in that The first prism further comprises a first reflecting surface inclined at the first light incident surface, the second prism further comprises a second reflecting surface parallel to the first light incident surface, the third prism further comprises a third reflecting surface inclined at the third light emitting surface, the first light incident surface and the third light emitting surface are parallel, and in the direction from the first light incident surface to the third light emitting surface, the first reflecting surface, the first light emitting surface, the second light incident surface, the second light emitting surface, the third light incident surface and the third reflecting surface are arranged in sequence; At least part of the light incident on the first prism from the first light incident surface can be reflected by the first reflecting surface to the first light incident surface, and then emitted from the first light emitting surface after being reflected by the first light incident surface. At least part of the light incident on the second prism from the second light incident surface can be reflected by the second reflecting surface to the second light emitting surface. At least part of the light incident on the third prism from the third light incident surface can be reflected by the third light emitting surface to the third reflecting surface, and then emitted from the third light emitting surface after being reflected by the third reflecting surface.

14. The optical transmission component according to claim 13, characterized in that The angle between the first light incident surface and the first reflection surface, and the angle between the third light emitting surface and the third reflection surface are 27°-33°, the angle between the first light emitting surface and the first light incident surface, and the angle between the third light incident surface and the third light exiting surface are 30°-45°, the first light exiting surface is parallel to the second light incident surface, and the second light exiting surface is parallel to the third light incident surface.

15. A camera module, characterized in that: It comprises a lens, an image sensor and an optical transmission component as claimed in any one of claims 8 to 14, wherein the lens is opposite to the first light emitting surface, and the optical transmission component is used to transmit at least part of the light emitted by the lens to the image sensor.

16. An electronic device, characterized in that: Including the camera module as described in claim 15.

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