Camera module and electronic equipment

Abstract

The invention relates to a camera module and electronic equipment. The camera module comprises a lens, an image sensor, an optical conduction element, a first induction transmission film and a second induction transmission film, the optical conduction element comprises a first reflective surface and a second reflective surface which are arranged oppositely, and the first induction transmission film and the second induction transmission film are arranged on the first reflective surface and the second reflective surface respectively. The first induction transmission film is used for filtering a spectral band superposed by the channel B and the channel G; the second induction transmission film is used for filtering a spectral band superposed by the channel R and the channel G. According to the camera module and the electronic equipment provided by the invention, superposition of light entering the image sensor in the channel B and the channel G and superposition of light in the channel R and the channel G are reduced, so that crosstalk of light in the channel RGB of the image sensor is avoided; therefore, the imaging color accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of camera devices, and in particular to a camera module and electronic equipment. Background Art

[0002] With the development of electronic devices such as smartphones and tablet computers, consumers have increasingly higher requirements for the photo and video quality of the camera modules of electronic devices.

[0003] In the related art, when the light passing through the lens module enters the image sensor for imaging, the color accuracy of the imaging is poor, which in turn causes the captured image to be distorted. Summary of the invention

[0004] The embodiments of the present application provide a camera module and an electronic device to solve the problem of how to improve imaging color.

[0005] On the one hand, the present application provides a camera module, comprising:

[0006] Lens;

[0007] An image sensor having RGB three primary color channels for synthesizing colors;

[0008] An optical transmission element, comprising a first reflecting surface and a second reflecting surface arranged in opposite directions, wherein the first reflecting surface is used to reflect the light collected by the lens to the second reflecting surface, and the second reflecting surface is used to reflect the reflected light to the image sensor;

[0009] A first induced transmission film is provided on one of the first reflective surface and the second reflective surface, the first induced transmission film is used to filter a first spectral band, and the first spectral band is a spectral band where a B channel and a G channel are superimposed;

[0010] The second induced transmission film is disposed on the other of the first reflective surface and the second reflective surface, and the second induced transmission film is used to filter a second spectral band, which is a spectral band where the R channel and the G channel are superimposed.

[0011] In one embodiment, the first induced transmission film and the second induced transmission film both include a first dielectric film, a second dielectric film and a metal film, and the metal film is sandwiched between the first dielectric film and the second dielectric film layer.

[0012] In one embodiment, the thickness of the metal film of the first induced transmission film is equal to the thickness of the metal film of the second induced transmission film; and / or the thickness of the metal film of the first induced transmission film is 800nm~1100nm, and the thickness of the metal film of the second induced transmission film is 1900nm~2400nm.

[0013] In one embodiment, the first dielectric film and the second dielectric film both include titanium dioxide layers and silicon dioxide layers alternately arranged, a side of the first dielectric film where the silicon dioxide layer is arranged is connected to the metal film, and a side of the second dielectric film where the silicon dioxide layer is arranged is connected to the metal film.

[0014] In one embodiment, the refractive index of the metal film is less than or equal to 0.2, and the extinction coefficient is greater than or equal to 3.7.

[0015] In one embodiment, the material of the metal film includes silver, magnesium or aluminum.

[0016] In one embodiment, the thickness of the first dielectric film of the first induced transmission film is 400nm~500nm, and the thickness of the second dielectric film of the first induced transmission film is 400nm~500nm; and / or, the thickness of the first dielectric film of the second induced transmission film is 1400nm~1600nm, and the thickness of the second dielectric film of the second induced transmission film is 400nm~500nm.

[0017] In one embodiment, the filtering peak of the first induced transmission film for the first spectral band is at 484nm, and the corresponding reflectivity is less than or equal to 5%, the half-peak bandwidth is 10nm~13nm, and the bandwidth with a reflectivity of 90% is 20nm~25nm;

[0018] And / or, the filtering peak of the second induced transmission film for the second spectral band is at 575nm, and the corresponding reflectivity is less than or equal to 5%, the half-peak bandwidth is 11nm~14nm, and the bandwidth with a reflectivity of 90% is 23nm~27nm.

[0019] In one embodiment, the optical transmission element includes at least one trapezoidal prism, and / or the optical transmission element includes at least one triangular prism.

[0020] In one embodiment, the optical transmission element includes a light-transmitting surface, a bottom surface, a first side surface and a second side surface, the light-transmitting surface is parallel to the bottom surface, the first side surface and the second side surface are connected between the light-transmitting surface and the bottom surface, and the first side surface and the second side surface are both perpendicular to the light-transmitting surface; the first reflecting surface and the second reflecting surface are both connected between the light-transmitting surface and the bottom surface, and the first reflecting surface and the second reflecting surface are both perpendicular to the first side surface; the first reflecting surface and the second reflecting surface are arranged to be inclined relative to the light-transmitting surface, the optical axis of the image sensor and the optical axis of the lens are both perpendicular to the light-transmitting surface, the lens is opposite to the first reflecting surface along its optical axis direction, and the image sensor is opposite to the second reflecting surface along its optical axis direction; wherein the optical transmission element is configured such that the light collected by the lens is reflected to the image sensor via the first reflecting surface and the second reflecting surface in sequence.

[0021] In one embodiment, the optical transmission element is configured as follows: the light collected by the lens is reflected to the image sensor via the first reflecting surface, the transparent surface and the second reflecting surface in sequence; or, the transparent surface includes a first reflecting portion and a second reflecting portion that are spaced apart, and the optical transmission element is configured as follows: the light collected by the lens is reflected to the image sensor via the first reflecting surface, the first reflecting portion, the bottom surface, the second reflecting portion and the second reflecting surface in sequence.

[0022] On the other hand, the present application provides an electronic device, which includes the camera module as described above.

[0023] In the above-mentioned camera module and electronic equipment, the first reflective surface and the second reflective surface of the optical transmission element are respectively provided with a first induced transmission film and a second induced transmission film, the first induced transmission film filters the spectral band superimposed by the B channel and the G channel, and the second induced transmission film filters the spectral band superimposed by the R channel and the G channel, thereby reducing the light entering the image sensor in the superposition of the B channel and the G channel, and the superposition of the R channel and the G channel, so that the light in the RGB three primary color channels of the image sensor will not have crosstalk, which is beneficial to improve the color accuracy of imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1A schematic rear view of an electronic device in one embodiment.

[0026] Figure 2 It is a schematic structural diagram of a camera module in one embodiment.

[0027] Figure 3 The present invention is a reflectivity curve diagram of the first reflective surface or the second reflective surface in a camera module of the related art.

[0028] Figure 4 Schematic diagram of the structure of a first induced transmission film and a second induced transmission film in a camera module in one embodiment.

[0029] Figure 5 It is a reflectivity curve diagram of the first induced transmission film in a camera module in one embodiment.

[0030] Figure 6 It is a reflectivity curve diagram of the second induced transmission film in a camera module in one embodiment.

[0031] Figure 7 It is a schematic structural diagram of a camera module in another embodiment.

[0032] Figure 8 It is a structural schematic diagram of a camera module in yet another embodiment.

[0033] Fig. 9 Schematic diagram of the structure of an optical transmission element of a camera module in one embodiment.

[0034] Fig.10 It is a schematic diagram of the structure of the optical transmission element of the camera module in another embodiment.

[0035] Fig.11 The figure is a schematic diagram of the structure of the optical transmission element of the camera module in another embodiment.

[0036] Fig.12 It is a bottom view schematic diagram of a camera module in one embodiment, in which the first induced transmission film and the second induced transmission film are respectively disposed on the first reflective surface and the second reflective surface.

[0037] Fig.13 Schematic diagram of the structure of an electronic device in one embodiment.

[0038] Reference numerals:

[0039] 10. Electronic device; 11. Shell; 111. Light-transmitting portion; 12. Decorative piece; 20. Camera module; 21. Lens; 22. Image sensor; 23. Optical transmission element; 23a. Trapezoidal prism; 23b. Prism; 231. First side surface; 232. Second side surface; 233. Light-transmitting surface; 2331. First reflecting portion; 2332. Second reflecting portion; 234. Bottom surface; 235. First reflecting surface; 236. Second reflecting surface; 24. First induced transmission film; 25. Second induced transmission film; M1. First dielectric film; M2. Metal film; M3. Second dielectric film; 26. Filter element. DETAILED DESCRIPTION

[0040] 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.

[0041] 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:

[0042] (1) Connection via wired lines, such as Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, and direct cable connection;

[0043] (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.

[0044] 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:

[0045] (1) Satellite phone or cellular phone;

[0046] (2) Personal Communications System (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communications capabilities;

[0047] (3) Radiotelephone, pager, Internet / Intranet access, Web browser, notepad, calendar, Personal Digital Assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0048] (4) conventional laptop and / or handheld receivers;

[0049] (5) Conventional laptop and / or palmtop radiotelephone transceivers, etc.

[0050] See also Figure 1 As shown, the electronic device 10 includes a housing 11, and the space enclosed by the housing 11 is used to set components of the electronic device 10 such as a camera module 20, a mainboard (not shown) and a battery (not shown). Among them, the mainboard can integrate the processor, power management module, storage unit and baseband chip of the electronic device 10. It can be understood that the electronic device 10 of the embodiment of the present application includes but is not limited to terminal devices such as mobile phones and tablet computers or other portable electronic devices 10.

[0051] In some embodiments, the housing 11 is provided with a light-transmitting portion 111, which may be a light inlet hole penetrating the housing 11, or a structural member such as glass or light-transmitting plastic. Taking the housing 11 provided with a light inlet hole as an example, the camera module 20 is arranged in the space enclosed by the housing 11, and the lens 21 of the camera module 20 is arranged corresponding to the light inlet hole, so that light outside the electronic device 10 can enter the lens 21 to meet the needs of the camera module 20 for imaging.

[0052] Combination Figure 2 As shown, the camera module 20 includes a lens 21, an image sensor 22 and an optical transmission element 23. The image sensor 22 is spaced apart from the lens 21, and the lens 21 and the image sensor 22 are located on the same side of the optical transmission element 23. The optical transmission element 23 is used to deflect the light collected by the lens 21 to the image sensor 22.

[0053] The image sensor 22 includes but is not limited to a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS Sensor).

[0054] The optical transmission element 23 includes a first reflecting surface 235 and a second reflecting surface 236 which are arranged opposite to each other. The first reflecting surface 235 is used to reflect the light collected by the lens 21 to the second reflecting surface 236, and the second reflecting surface 236 is used to reflect the reflected light to the image sensor 22. In this way, the light is reflected by the first reflecting surface 235 and the second reflecting surface 236 of the optical transmission element 23, so that the light collected by the lens 21 can be deflected under the action of the optical transmission element 23. In this way, the optical transmission element 23 can realize the transmission of light between the lens 21 and the image sensor 22 to meet the shooting needs of the camera module 20.

[0055] The inventors found that after the light collected by the lens 21 enters the image sensor 22 under the reflection of the first reflective surface 235 and the second reflective surface 236, the image obtained by the image sensor 22 has color cast, that is, the color accuracy of the image is poor, resulting in distortion of the image. The inventors found through further research that the factor causing such poor color accuracy is the crosstalk between different colors.

[0056] For ease of understanding, the basic principle of imaging performed by the image sensor 22 is explained below.

[0057] Three-primary color imaging based on the "three-color theory" usually refers to the red, green and blue (RGB) three-primary color imaging technology, which generally includes two links: color imaging and color image display. The color separation structure of the three-primary color imaging system in the related technology mainly uses the three primary colors of red, green and blue, namely RGB, or the four primary colors of cyan, magenta, yellow and green, namely CMYG; they are widely used in two-dimensional staring imaging devices and one-dimensional scanning imaging devices, the former is mainly used in digital cameras or cameras, and the latter is widely used in digital scanners.

[0058] Based on this, the image sensor 22 has three primary color channels, RGB, for synthesizing colors, wherein the R channel represents a red light channel, the G channel represents a green light channel, and the B channel represents a blue light channel.

[0059] Combination Figure 3 As shown, in the related art, when the reflected light enters the image sensor 22, there will be overlapping spectral bands between different channels. Specifically, the reflectivity of the intersection of the reflection curves of the B channel and the G channel (at about 484nm) reaches 70%, that is, whether it is blue light or green light, the spectrum corresponding to 484nm will be reflected into the image sensor 22. In this way, there will be crosstalk between the blue light and the green light, resulting in a decrease in the accuracy of the color when imaging. Accordingly, continue as Figure 3As shown in FIG. 1 , the reflectivity at the intersection of the reflection curves of the R channel and the G channel (at about 575 nm) reaches 66%. Therefore, the red light and the green light are reflected into the image sensor 22 at a high reflectivity in the spectrum near 575 nm, which causes crosstalk between the red light and the green light during imaging. Figure 3 It can be seen that the reflectivity corresponding to the intersection of the reflection curves of the R channel and the G channel (about 560nm) is less than 10%. Therefore, the reflectivity of red light and green light near the corresponding 560nm is low and crosstalk is not easy to occur.

[0060] Combination Figure 2 As shown, in the embodiment of the present application, the optical transmission element 23 includes a first transmission inducing film 24 and a second transmission inducing film 25 .

[0061] The first induced transmission film 24 is disposed on the first light reflecting surface 235, and the second induced transmission film 25 is disposed on the second light reflecting surface 236. It should be noted that, in some embodiments, the first induced transmission film 24 and the second induced transmission film 25 can be interchanged, that is, the first induced transmission film 24 is disposed on the second light reflecting surface 236, and the second induced transmission film 25 is disposed on the first light reflecting surface 235.

[0062] The first induced transmission film 24 is used to filter the first spectral band, which is the spectral band where the B channel and the G channel are superimposed. The first induced transmission film 24 is used to filter the first spectral band, which is the spectral band where the B channel and the G channel are superimposed.

[0063] In this embodiment, the spectral band where the B channel and the G channel overlap is filtered by the first induced transmission film 24, and the spectral band where the R channel and the G channel overlap is filtered by the second induced transmission film 25, thereby reducing the overlap of the light entering the image sensor 22 in the B channel and the G channel, and the overlap of the R channel and the G channel, so that the light in the RGB three primary color channels of the image sensor 22 will not have crosstalk, which is beneficial to improve the color accuracy of imaging.

[0064] Combination Figure 4 As shown, in some embodiments, the first induced transmission film 24 and the second induced transmission film 25 both include a first dielectric film M1, a second dielectric film M2 and a metal film M2, and the metal film M2 is sandwiched between the first dielectric film M1 and the second dielectric film M2.

[0065] For the metal film M2, the formula for its reflectivity to vertically incident light in air is as follows:

[0066]

[0067] Wherein, R is the reflectivity, n-ik is the complex refractive index of the metal film M2; wherein, n is the refractive index, and k is the extinction coefficient.

[0068] In the embodiment of the present application, the first induced transmission film 24 and the second induced transmission film 25 are metal induced films, and each layer structure of the first induced transmission film 24 and the second induced transmission film 25 can be configured based on the metal induced film principle.

[0069] Specifically, for metal induced films, the absorption of the metal film M2 is not only determined by the optical constants (refractive index n, extinction system k) and thickness of the metal film M2 itself, but also closely related to the admittance of the adjacent medium. If an appropriate anti-reflection film stack (such as the first dielectric film M1) is designed on the incident side to reduce the reflection of the entire film system to near zero, the transmittance of the metal film M2 corresponding to a certain spectrum can be maximized, thereby achieving the effect of induced transmission.

[0070] It should be noted here that the dielectric film system on both sides of the metal film M2 (i.e., the first dielectric film M1 and the second dielectric film M2) not only increases the transmittance of the central wavelength of the metal film M2, but also increases the transmittance for a limited wavelength band because each film system contains a considerable number of layers. However, outside this wavelength band, the increase in transmittance quickly transitions to an increase in reflectivity. In other words, a bandpass filter is produced.

[0071] According to the metal induced film principle, metal materials with large k / n ratio are selected as much as possible at the central wavelength to make the metal film M2.

[0072] For example, in the embodiment of the present application, a metal film M2 made of metal materials such as silver, magnesium or aluminum is used in the visible light band. In this way, the first induced transmission film 24 of the metal film M2 can filter the first spectral band, reduce the overlapped spectral bands of the R channel and the G channel of the image sensor 22, and then reduce the color crosstalk problem between pixels, making the color of the image more accurate.

[0073] In some embodiments, the refractive index of the metal film M2 is less than or equal to 0.2, and the extinction coefficient is greater than or equal to 3.7, so that k / n is large enough to improve the light transmittance of the corresponding band, and then the first induced transmission film 24 has a good filtering effect on the first spectral band, and the second induced transmission film 25 has a good filtering effect on the second spectral band. For example, the material of the metal film M2 includes silver, magnesium or aluminum. Such materials have a large k / n, which is conducive to improving the light transmittance of the corresponding band.

[0074] Since the first induced transmission film 24 is disposed on one of the first reflective surface 235 and the second reflective surface 236, and the second induced transmission film 25 is disposed on the other of the first reflective surface 235 and the second reflective surface 236 in the camera module 20 of the present application, the camera module 20 of the present application can obtain a good telephoto shooting effect by using the optical transmission element 23. Based on this, the camera module 20 of the present application can improve the color accuracy of the imaging picture while taking into account the telephoto shooting effect, thereby improving the telephoto shooting experience.

[0075] In some embodiments, the first dielectric film M1 and the second dielectric film M2 both include titanium dioxide layers and silicon dioxide layers that are alternately arranged, and the side of the first dielectric film M1 where the silicon dioxide layer is arranged is connected to the metal film M2, and the side of the second dielectric film M2 where the silicon dioxide layer is arranged is connected to the metal film M2. In this embodiment, the titanium dioxide layers and silicon dioxide layers that are alternately arranged are used as the first dielectric film M1 and the second dielectric film M2, so as to protect both sides of the metal film M2, and at the same time, the entire film system of the first induced transmission film 24 can achieve the effect of induced transmission of the first spectral band. Accordingly, the entire film system of the second induced transmission film 25 that adopts this structural form can achieve the effect of induced transmission of the second spectral band.

[0076] In some embodiments, the thickness of the first dielectric film M1 of the first induced transmission film 24 is 400nm-500nm, and the thickness of the second dielectric film M2 of the first induced transmission film 24 is 400nm-500nm. For example, the thickness of the first dielectric film M1 of the first induced transmission film 24 is 400nm, and the thickness of the second dielectric film M2 of the first induced transmission film 24 is 400nm. Alternatively, the thickness of the first dielectric film M1 of the first induced transmission film 24 is 400nm, and the thickness of the second dielectric film M2 of the first induced transmission film 24 is 500nm. Alternatively, the thickness of the first dielectric film M1 of the first induced transmission film 24 is 500nm, and the thickness of the second dielectric film M2 of the first induced transmission film 24 is 400nm.

[0077] Through the configuration of the film thickness described above, the entire film system of the first induced transmission film 24 can achieve the effect of inducing transmission of the first spectral band.

[0078] The thickness of the first dielectric film M1 of the second induced transmission film 25 is 1400nm-1600nm, and the thickness of the second dielectric film M2 of the second induced transmission film 25 is 400nm-500nm. For example, the thickness of the first dielectric film M1 of the second induced transmission film 25 is 1400nm, and the thickness of the second dielectric film M2 of the second induced transmission film 25 is 400nm. Alternatively, the thickness of the first dielectric film M1 of the second induced transmission film 25 is 1400nm, and the thickness of the second dielectric film M2 of the second induced transmission film 25 is 500nm. Alternatively, the thickness of the first dielectric film M1 of the second induced transmission film 25 is 1600nm, and the thickness of the second dielectric film M2 of the second induced transmission film 25 is 400nm.

[0079] By configuring the film thickness as described above, the entire film system of the second induced transmission film 25 can achieve the effect of inducing transmission of the second spectral band.

[0080] In some embodiments, the first induced transmission film 24 has a filtering peak for the first spectral band at 484 nm, and the corresponding reflectivity is less than or equal to 5%, the half-peak bandwidth is 10 nm to 13 nm, and the bandwidth with a reflectivity of 90% is 20 nm to 25 nm. In this way, the first spectral band can cover most of the spectral bands in the spectral bands superimposed by the B channel and the G channel, so that the first induced transmission film 24 can filter the first spectral band while meeting the reflection needs of other non-first spectral bands to improve the imaging quality.

[0081] The filtering peak of the second induced transmission film 25 for the second spectral band is at 575nm, and the corresponding reflectivity is less than or equal to 5%, the half-peak bandwidth is 11nm~14nm, and the bandwidth with a reflectivity of 90% is 23nm~27nm. In this way, the second spectral band can cover most of the spectral bands in the spectral band superimposed by the B channel and the G channel, so that the second induced transmission film 25 can filter the second spectral band while meeting the reflection needs of other light rays not in the second spectral band, so as to improve the imaging quality.

[0082] For ease of understanding, the layer structure of the first transmission inducing film 24 is described below in conjunction with the structures of the first dielectric film M1 and the metal film M2.

[0083] In some implementations, the metal film M2 in the metal film M2 is made of silver (Ag) as an example. As shown in Table 1 below:

[0084]

[0085] Table 1 shows the film structure of the first transmission inducing film 24 and the thickness of each layer.

[0086] Wherein, SIO2 represents a silicon dioxide layer, TIO2 represents a titanium dioxide layer, and Ag represents a metal film M2 whose material is metal silver. In the first induced transmission film 24, the titanium dioxide layer and the silicon dioxide layer alternately arranged in the first dielectric film M1 have thicknesses of 46.34nm, 80.25nm, 46.34nm, 80.25nm, 46.34nm and 144.3nm, respectively; the metal film M2 is a silver film with a thickness of 82nm; the silicon dioxide layer and the titanium dioxide layer alternately arranged in the second dielectric film M2 have thicknesses of 144.25nm, 46.34nm, 80.25nm, 46.34nm, 80.25nm and 46.34nm, respectively.

[0087] In some embodiments, the optical conductive element 23 may be made of H-K9L glass with a refractive index of 1.52. By allowing the light in the optical conductive element 23 to be incident on the first induced transmission film 24 for optical testing, a reflectivity curve of the first induced transmission film 24 may be obtained.

[0088] Figure 5 FIG. 2 shows a reflectivity curve of the first induced transmission film 24, where the horizontal axis is wavelength and the vertical axis is reflectivity. Figure 5 As shown, according to the reflectivity curve of the first induced transmission film 24, it can be known that the minimum reflectivity of the first induced transmission film 24 for visible light in the band of 400nm~700nm is 0% (at 484nm), the half-peak bandwidth is equal to 11.8nm, and the bandwidth corresponding to R=90% is 22nm. It can be seen that the reflectivity of the first induced transmission film 24 corresponding to the first spectral band is low enough, so that the first spectral band is transmitted from the first reflective surface 235, reducing reflection, and then reducing the light of the first spectral band entering the image sensor 22 to cause the B channel and the G channel to overlap and generate color crosstalk, so as to improve the accuracy of color and enhance the experience of telephoto shooting.

[0089] As shown in Table 2:

[0090]

[0091] Table 2 shows the film structure of the second transmission inducing film 25 and the thickness of each layer.

[0092] Wherein, SIO2 represents a silicon dioxide layer, TIO2 represents a titanium dioxide layer, and Ag represents a metal film M2 whose material is metal silver. In the second induced transmission film 25, the titanium dioxide layer and the silicon dioxide layer alternately arranged in the first dielectric film M1 are 58.99nm, 98.53nm, 58.99nm, 98.53nm, 58.99nm and 1177nm thick respectively; the metal film M2 is a silver film with a thickness of 82nm; the silicon dioxide layer and the titanium dioxide layer alternately arranged in the second dielectric film M2 are 177.36nm, 58.99nm, 98.53nm, 58.99nm, 98.53nm and 58.99nm thick respectively.

[0093] In some embodiments, the optical conductive element 23 may be made of H-K9L glass with a refractive index of 1.52. By allowing the light in the optical conductive element 23 to be incident on the second induced transmission film 25 for optical testing, a reflectivity curve of the second induced transmission film 25 may be obtained.

[0094] Figure 6 FIG. 2 shows a reflectivity curve of the second induced transmission film 25, where the horizontal axis is wavelength and the vertical axis is reflectivity. Figure 6 As shown, according to the reflectivity curve of the second induced transmission film 25, it can be known that the minimum reflectivity of the second induced transmission film 25 for visible light in the band of 400nm~700nm is 0% (at 484nm), the half-peak bandwidth is equal to 11.8nm, and the bandwidth corresponding to R=90% is 22nm. It can be seen that the reflectivity of the second induced transmission film 25 corresponding to the second spectral band is low enough, so that the second spectral band is transmitted from the second reflective surface 236, reducing reflection, and then reducing the light of the second spectral band entering the image sensor 22 to cause the R channel and the G channel to overlap and generate color crosstalk, so as to improve the accuracy of color and enhance the experience of telephoto shooting.

[0095] Tables 1 and 2 above only illustrate the thickness of each layer structure of the first transmission inducing film 2424 in some embodiments. The thickness of the first dielectric film M1, the second dielectric film M2 and the metal film M2 of the present application are not limited thereto.

[0096] For ease of understanding, the optical path configuration of the optical transmission element 23 between the lens 21 and the image sensor 22 is described below in conjunction with the structure of the optical transmission element 23 , but it does not mean that the structure of the optical transmission element 23 and its optical path of the present application are limited thereto.

[0097] The optical transmission element 23 may deflect the light twice, or three times or more.

[0098] For example, Figure 2As shown, the optical transmission element 23 deflects the light collected by the lens 21 twice and then makes it incident on the image sensor 22 .

[0099] For example, Figure 7 As shown, the optical transmission element 23 deflects the light collected by the lens 21 three times and then makes it incident on the image sensor 22 .

[0100] For example, Figure 8 As shown, the optical transmission element 23 deflects the light collected by the lens 21 five times before the light is incident on the image sensor 22 .

[0101] The number of times the optical transmission element 23 deflects the light may be 7 or more times, which will not be described in detail here.

[0102] It should be noted that, as the number of times the optical transmission element 23 deflects the light increases, the propagation path of the light in the optical transmission element 23 increases, thereby increasing the focal length between the lens 21 and the image sensor 22, which is beneficial to the telephoto shooting effect. At the same time, through multiple deflections of the light, the size of the optical transmission element 23 along the optical axis direction of the lens 21 (i.e., the thickness of the optical transmission element 23) can also be made smaller, which is beneficial to reducing the height of the camera module 20, so as to facilitate the miniaturization of the camera module 20.

[0103] In some embodiments, the camera module 20 further includes a filter element 26, which is disposed in the optical path of the light emitted from the optical transmission element 23 to the image sensor 22. The filter element 26 is used to filter out the interference light emitted from the optical transmission element 23 to prevent the interference light from reaching the image sensor 22 and affecting normal imaging. In one embodiment, the filter element 26 may be an infrared cutoff filter.

[0104] Combination Figures 7 to 9 As shown, the optical transmission element 23 includes a light-transmitting surface 233, a bottom surface 234, a first light-reflecting surface 235, and a second light-reflecting surface 236. The light-transmitting surface 233 is parallel to the bottom surface 234, the first side surface 231 and the second side surface 232 are connected between the light-transmitting surface 233 and the bottom surface 234, and the first side surface 231 and the second side surface 232 are perpendicular to the light-transmitting surface 233; the first light-reflecting surface 235 and the second light-reflecting surface 236 are connected between the light-transmitting surface 233 and the bottom surface 234, and the first light-reflecting surface 235 and the second light-reflecting surface 236 are perpendicular to the first side surface 231; the first light-reflecting surface 235 and the second light-reflecting surface 236 are arranged to be inclined relative to the light-transmitting surface 233, the optical axis of the image sensor 22 and the optical axis of the lens 21 are perpendicular to the light-transmitting surface 233, the lens 21 is opposite to the first light-reflecting surface 235 along its optical axis direction, and the image sensor 22 is opposite to the second light-reflecting surface 236 along its optical axis direction.

[0105] It should be noted that the light reflected by the first reflecting surface 235 and the second reflecting surface 236 in sequence includes the case where the light reflected by the first reflecting surface 235 is directly incident on the second reflecting surface 236 , and also includes the case where the light reflected by the first reflecting surface 235 is reflected by other surfaces of the optical transmission element 23 to the second reflecting surface 236 .

[0106] For example, combined with Figure 7 As shown, in some embodiments, the optical transmission element 23 is configured such that the light collected by the lens 21 is reflected to the image sensor 22 via the first reflective surface 235 , the light-transmitting surface 233 , and the second reflective surface 236 in sequence.

[0107] For example, in some embodiments, in combination Figure 8 As shown, the light-transmitting surface 233 includes a first reflective portion 2331 and a second reflective portion 2332 arranged at intervals. The optical transmission element 23 is configured such that the light collected by the lens 21 is sequentially reflected to the image sensor 22 via the first reflective surface 235, the first reflective portion 2331, the bottom surface 234, the second reflective portion 2332 and the second reflective surface 236.

[0108] In the embodiment of the present application, the optical transmission element 23 may be an integral prism, or may be composed of a plurality of prisms.

[0109] The optical transmission element 23 includes at least one trapezoidal prism 23a, and / or the optical transmission element 23 includes at least one triangular prism 23b.

[0110] For example, combined with Fig.10 As shown, the optical transmission element 23 includes a trapezoidal prism 23a and a triangular prism 23b. The cross section of the optical transmission element 23 formed by the combination of the triangular prism 23b and the trapezoidal prism 23a is trapezoidal. It can be understood that the optical transmission element 23 is a larger trapezoidal prism supported by the combination of the trapezoidal prism 23a and the triangular prism 23b. Fig.11 As shown, the optical transmission element 23 includes three trapezoidal prisms 23a, and two trapezoidal prisms 23a are combined to form a trapezoidal prism of a larger size.

[0111] The number and type of prisms in the optical transmission element 23 are not elaborated here, as long as the optical transmission element 23 as a whole can adapt to the deflection of the light collected by the lens 21 so that the light enters the image sensor 22 to meet the shooting needs of the camera module 20.

[0112] The shapes of the first induced transmission film 2424 and the second induced transmission film 25 may be consistent with the shapes of the first reflective surface 235 and the second reflective surface 236 to completely cover the first reflective surface 235 and the second reflective surface 236. Of course, in some embodiments, the first reflective surface 235 and the second reflective surface 236 may be completely covered. Fig.12As shown, the first inducing transmission film 2424 only needs to cover the area of ​​the first reflecting surface 235 or the second reflecting surface 236 for reflecting light to the image sensor 22 for imaging. Therefore, the sizes of the first inducing transmission film 2424 and the second inducing transmission film 25 are not limited here.

[0113] refer to Fig.13 , Fig.13 The 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.13 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.

[0114] 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 user identity module (SIM, SubsAgiber Identity Module) card, a transceiver, a coupler, a low noise amplifier (LNA, Low Noise Amplifier), 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, General Packet Radio Service), Code Division Multiple Access (CDMA, Code Division Multiple Access), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), Long Term Evolution (LTE, LongTerm Evolution), email, Short Message Service (SMS, Short Messaging Service), etc.

[0115] 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.

[0116] 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.

[0117] 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 Agystal 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.13 In the embodiment, the touch sensitive surface and the display panel are used as two independent components to implement input and output functions, but in some embodiments, the touch sensitive surface and the display panel can be integrated to implement input and output functions. It can be understood that the display screen can include an input unit 503 and a display unit 504.

[0118] 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.

[0119] 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.

[0120] 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.13 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.

[0121] 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.

[0122] 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.

[0123] although Fig.13 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.

[0124] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0125] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood 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. A camera module, characterized in that: include: Lens; An image sensor having RGB three primary color channels for synthesizing colors; An optical transmission element, comprising a first reflecting surface and a second reflecting surface arranged in opposite directions, wherein the first reflecting surface is used to reflect the light collected by the lens to the second reflecting surface, and the second reflecting surface is used to reflect the reflected light to the image sensor; A first induced transmission film is provided on one of the first reflective surface and the second reflective surface, the first induced transmission film is used to filter a first spectral band, and the first spectral band is a spectral band where a B channel and a G channel are superimposed; The second induced transmission film is disposed on the other of the first reflective surface and the second reflective surface, and the second induced transmission film is used to filter a second spectral band, which is a spectral band where the R channel and the G channel are superimposed.

2. The camera module according to claim 1, characterized in that: The first induced transmission film and the second induced transmission film both include a first dielectric film, a second dielectric film and a metal film, and the metal film is sandwiched between the first dielectric film and the second dielectric film layer.

3. The camera module according to claim 2, characterized in that: The thickness of the metal film of the first transmission induced film is equal to the thickness of the metal film of the second transmission induced film; And / or, the thickness of the metal film of the first induced transmission film is 800 nm to 1100 nm, and the thickness of the metal film of the first induced transmission film is 1900 nm to 2400 nm.

4. The camera module according to claim 2 or 3, characterized in that: The first dielectric film and the second dielectric film both include titanium dioxide layers and silicon dioxide layers alternately arranged, the side of the first dielectric film where the silicon dioxide layer is arranged is connected to the metal film, and the side of the second dielectric film where the silicon dioxide layer is arranged is connected to the metal film.

5. The camera module according to claim 4, characterized in that: The refractive index of the metal film is less than or equal to 0.2, and the extinction coefficient is greater than or equal to 3.

7.

6. The camera module according to claim 5, characterized in that: The material of the metal film includes silver, magnesium or aluminum.

7. The camera module according to claim 4, characterized in that: The thickness of the first dielectric film of the first induced transmission film is 400nm-500nm, and the thickness of the second dielectric film of the first induced transmission film is 400nm-500nm; And / or, the thickness of the first dielectric film of the second transmission induced film is 1400nm-1600nm, and the thickness of the second dielectric film of the second transmission induced film is 400nm-500nm.

8. The camera module according to claim 1, characterized in that: The filtering peak of the first induced transmission film for the first spectral band is at 484nm, and the corresponding reflectivity is less than or equal to 5%, the half-peak bandwidth is 10nm~13nm, and the broadband with a reflectivity of 90% is 20nm~25nm; And / or, the filtering peak of the second induced transmission film for the second spectral band is at 575nm, and the corresponding reflectivity is less than or equal to 5%, the half-peak bandwidth is 11nm~14nm, and the bandwidth with a reflectivity of 90% is 23nm~27nm.

9. The camera module according to claim 1, characterized in that: The optical transmission element includes at least one trapezoidal prism, and / or the optical transmission element includes at least one triangular prism.

10. The camera module according to claim 1, characterized in that: The optical transmission element comprises a light-transmitting surface, a bottom surface, a first side surface and a second side surface, the light-transmitting surface is parallel to the bottom surface, the first side surface and the second side surface are connected between the light-transmitting surface and the bottom surface, and the first side surface and the second side surface are both perpendicular to the light-transmitting surface; the first light-reflecting surface and the second light-reflecting surface are both connected between the light-transmitting surface and the bottom surface, and the first light-reflecting surface and the second light-reflecting surface are both perpendicular to the first side surface; the first light-reflecting surface and the second light-reflecting surface are arranged to be inclined relative to the light-transmitting surface, the optical axis of the image sensor and the optical axis of the lens are both perpendicular to the light-transmitting surface, the lens is opposite to the first light-reflecting surface along its optical axis direction, and the image sensor is opposite to the second light-reflecting surface along its optical axis direction; Wherein, the optical transmission element is configured such that the light collected by the lens is reflected to the image sensor via the first reflecting surface and the second reflecting surface in sequence.

11. The camera module according to claim 10, characterized in that: The optical transmission element is configured such that: the light collected by the lens is reflected to the image sensor via the first light reflecting surface, the light transmitting surface and the second light reflecting surface in sequence; Alternatively, the light-transmitting surface includes a first reflecting portion and a second reflecting portion that are spaced apart, and the optical transmission element is configured such that the light collected by the lens is reflected to the image sensor via the first reflecting surface, the first reflecting portion, the bottom surface, the second reflecting portion and the second reflecting surface in sequence.

12. An electronic device, characterized in that: The electronic device includes a camera module as described in any one of claims 1-11.

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