CN110723904B

CN110723904B - Blue glass, infrared cut-off filter, camera assembly and electronic equipment

Info

Publication number: CN110723904B
Application number: CN201911099603.0A
Authority: CN
Inventors: 韦怡; 张海裕; 周彦汝; 陈嘉伟
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2022-09-09
Anticipated expiration: 2039-11-12
Also published as: CN110723904A

Abstract

The application discloses blue glass, infrared cut-off filter, camera subassembly and electronic equipment. Specifically, the present application proposes a blue glass, which includes, based on the total mass of the blue glass: 60.1-75 wt% of phosphorus pentoxide, and 0.5-2.5 wt% of copper oxide. Therefore, when the component content of the blue glass is within the range, the center cut-off wavelength of the blue glass is longer, and when the blue glass is used in an infrared cut-off filter, infrared light can be cut off better, the absorption of red light in visible light is less, the transmittance of the visible light is higher, and the service performance is good.

Description

Blue glass, infrared cut-off filter, camera assembly and electronic equipment

Technical Field

The application relates to the field of materials, in particular to blue glass, an infrared cut-off filter, a camera assembly and electronic equipment.

Background

At present, electronic products such as camera assemblies (e.g., mobile phone camera assemblies, computer camera assemblies, etc.) and digital cameras used in electronic devices generally adopt a charge-coupled device image Sensor (CCD) or a complementary metal oxide semiconductor image Sensor (CMOS) to perform image sensing, the image Sensor (Sensor) converts light guided from a lens into an electrical signal, and then converts the electrical signal into a digital signal through an internal DA, and the digital signal is subjected to a series of amplification processing and storage processing and then transmitted to a screen to form an image. Because the light transmitted from the lens can also have part of infrared light besides visible light, the part of infrared light can be perceived by the image sensor although the part of infrared light is invisible to human eyes, and after a series of conversion, the part of infrared light can form a virtual image on the finally formed image, so that the problem that the image seen by human eyes is inconsistent with the image sensed by the image sensor occurs, and the shooting performance of the camera assembly is affected. At present, an infrared cut filter is generally disposed between a lens and an image sensor, and the infrared cut filter can cut infrared light and highly transmit visible light, so that the infrared light can be prevented from forming a virtual image on the image sensor, the influence of the infrared light on imaging can be improved, and the imaging of the visible light can not be influenced. At present, because the blue glass material can selectively absorb infrared light to achieve an infrared cut-off effect, and the blue glass material has the characteristics of good imaging, anti-glare and the like, more and more camera products select a blue glass filter as the infrared cut-off filter.

However, the current blue glass, infrared cut filter, camera assembly, and electronic device are still to be improved.

Disclosure of Invention

The present application is based on the discovery and recognition by the inventors of the following facts and problems:

the existing blue glass filter used in the camera component has the problems that the infrared cut-off effect and the visible light transmittance cannot be considered, and the product is light, thin and small. The infrared cut-off effect of the blue glass filter is greatly influenced by the thickness of the blue glass filter, and when the thickness of the blue glass filter is large, for example, the blue glass filter with the thickness of about 1.2mm is commonly used, the good infrared cut-off effect can be realized, but the transmittance of a visible light part is reduced due to the excessively thick thickness, and the miniaturization development of an imaging device is not facilitated. The existing blue glass infrared cut-off filter embedded in front of the image sensor generally has a thickness of only 0.1-0.3mm, and due to the reduced thickness, the absorption of the blue glass to the infrared band (700 + 1200nm) is reduced, and the infrared cut-off effect is weakened, for example, when the blue glass with a thickness of 0.3mm is adopted, the infrared light transmittance of the infrared cut-off band is about 20%, the infrared cut-off effect is poor, the imaging effect of the imaging device is affected, and the imaging quality is reduced. In order to improve the infrared cut-off effect of the blue glass filter with a thin thickness, an optical film with a high and low refractive index can be plated on the blue glass substrate, or an optical adhesive layer with infrared absorption performance and the like can be coated on the blue glass substrate, so that the infrared cut-off effect of the blue glass filter with a thin thickness can be improved, the visible light transmittance is not influenced, and the development of lightness, thinness and miniaturization of a device is facilitated. However, the center cut-off wavelength of the current blue glass (for example, blue glass with a thickness of 0.1-0.3 mm) is generally about 640nm ("center cut-off wavelength", which is the wavelength of light corresponding to a light transmittance curve of a filter such as blue glass with a light transmittance of 50%), after an optical adhesive layer with infrared absorption property is coated on the surface of the blue glass, the center cut-off wavelength of the formed blue glass filter is about 30nm shorter, that is, the center cut-off wavelength of the blue glass filter coated with the optical adhesive layer reaches about 610nm, such a spectrum transmittance curve is not matched with the sensing spectrum of the image sensor, the infrared cut-off filter coated with the optical adhesive layer can excessively filter out red light information in visible light, reduce the light intensity sensed by the image sensor, bring a night noise problem, and at the same time, seriously affect the white balance, and more seriously, the contrast ratio is reduced, and the shooting effect of the camera assembly is influenced. Therefore, if a new formula and composition of a blue glass can be provided, the center cut-off wavelength of the blue glass is longer, and the center cut-off wavelength of the infrared cut-off filter formed after the optical cement is coated is also longer, so that the infrared cut-off filter formed by the blue glass (for example, the infrared cut-off filter formed by coating the optical cement layer on the blue glass) can better cut off infrared light, and the infrared cut-off filter has less absorption to red light in visible light and higher transmittance to visible light, and the problems can be solved to a great extent.

The present application is directed to solving, at least in part, one of the technical problems in the related art.

In one aspect of the present application, a blue glass is presented. Based on the total mass of the blue glass, the blue glass comprises: 60.1-75 wt% of phosphorus pentoxide, and 0.5-2.5 wt% of copper oxide. Therefore, when the component content of the blue glass is within the range, the center cut-off wavelength of the blue glass is longer, and when the blue glass is used in an infrared cut-off filter, infrared light can be cut off better, the absorption of red light in visible light is less, the transmittance of the visible light is higher, and the service performance is good.

In another aspect of the present application, an infrared cut filter is presented. The infrared cut filter includes: a blue glass substrate comprising, based on a total mass of the blue glass substrate: 60.1 to 75 weight percent of phosphorus pentoxide, and 0.5 to 2.5 weight percent of copper oxide; the optical adhesive layer is arranged on one side of the blue glass substrate and can absorb infrared light, wherein the central cut-off wavelength of the infrared cut-off filter is 630-650 nm. Therefore, the infrared cut-off filter formed by the optical glue layer is arranged on the surface of the blue glass substrate with the component content, the central cut-off wavelength is relatively long, the infrared cut-off filter can better cut off infrared light, the absorption to red light in visible light is less, the transmittance to the visible light is higher, the intensity of the visible light sensed by the image sensor can be improved, and the shooting effect of an imaging product is improved.

In yet another aspect of the present application, a camera assembly is presented. The camera assembly includes: the camera is provided with a light incident surface; the infrared cut-off filter is arranged on the outer side of the light incident surface of the camera. Thus, the camera assembly has all the features and benefits of the infrared cut-off filter described above, and are not described herein again. Generally speaking, the camera component can avoid the problems of night scene noise, contrast reduction and the like caused by excessive red light information filtered by the infrared cut-off filter, and has good shooting effect and better use performance.

In yet another aspect of the present application, an electronic device is presented. The electronic device includes: a housing defining an accommodating space; the camera assembly is arranged in the accommodating space; the main board and the memory are positioned in the accommodating space; and the screen is arranged in the accommodating space and is connected with the main board. Thus, the electronic device has all the features and advantages of the camera assembly described above, which are not described in detail herein. Generally speaking, the camera assembly of the electronic equipment has good shooting effect and better service performance.

Drawings

Fig. 1 shows a schematic view of a structure of an infrared cut filter according to an example of the present application;

FIG. 2 shows a schematic structural diagram of an electronic device according to an example of the present application;

FIG. 3 shows a graph of spectral transmittance of blue glass according to examples of the present application and comparative examples;

fig. 4 shows a graph of spectral transmittance of an infrared cut filter according to an example of the present application; and

fig. 5 shows a graph of the spectral transmittance of the infrared cut filter in the comparative example.

Description of the reference numerals:

100: a blue glass substrate; 200: an optical adhesive layer; 1000: an infrared cut filter; 1100: an electronic device; 1200: a housing; 1300: a camera assembly.

Detailed Description

Examples of the present application are described in detail below, and are illustrated in the accompanying drawings. The examples described below with reference to the drawings are illustrative and intended to be used for explaining the present application and are not to be construed as limiting the present application.

In one aspect of the present application, a blue glass is presented. According to some examples of the present application, the blue glass includes, based on a total mass of the blue glass: 60.1-75 wt% of phosphorus pentoxide and 0.5-2.5 wt% of copper oxide. Therefore, when the component content of the blue glass is within the range, the center cut-off wavelength of the blue glass is longer, and when the blue glass is used in an infrared cut-off filter, infrared light can be cut off better, the absorption of red light in visible light is less, the transmittance of the visible light is higher, and the service performance is good.

For the sake of understanding, the following is a brief description of the principle by which the above-mentioned advantageous effects can be obtained:

as described above, the thickness of the conventional blue glass infrared cut filter used in a camera module of an electronic device or the like is generally thin, and in order to improve the infrared cut effect of the blue glass infrared cut filter, an optical adhesive layer or the like having an infrared absorption property is generally coated on the surface of a blue glass substrate. However, after the optical adhesive layer is coated on the surface of the blue glass substrate, the central cut-off wavelength of the infrared cut-off filter is too short (for example, the central cut-off wavelength is about 610 nm), and then the infrared cut-off filter filters excessive red information in visible light, so that the light intensity sensed by the image sensor is low, and further, the shooting problems such as contrast reduction, white balance imbalance, night scene noise, and the like are caused.

The inventors have found that, in order to improve the usability (i.e., improve the infrared light cut-off effect and reduce the absorption of red light in visible light) of a thin blue glass infrared cut-off filter coated with an optical cement layer or the like, a blue glass having a relatively long central cut-off wavelength, for example, the central cut-off wavelength of the blue glass is about 670-, White balance imbalance, contrast reduction, etc. Also, the inventors have found through a large number of experiments and intensive studies that the center cut-off wavelength of the blue glass can be adjusted and the infrared light absorption intensity of the blue glass can be adjusted by adjusting the components and content of the blue glass, particularly by adjusting the content and ratio of phosphorus pentoxide and copper oxide in the blue glass. Phosphorus pentoxide is the main component of the blue glass, and the phosphorus pentoxide is a glass network structure forming agent and can influence the absorption intensity of the blue glass to infrared light; the copper oxide has high light transmittance in a visible light wave band and strong absorption characteristic in a near infrared wave band, and the central cut-off wavelength of the blue glass can be adjusted by adjusting the content of the copper oxide in the blue glass. Thus, in the present application, the blue glass includes, based on the total mass of the blue glass: 60.1-75 wt% of phosphorus pentoxide, and 0.5-2.5 wt% of copper oxide. Compared with the conventional blue glass with the center cut-off wavelength of about 640nm, the blue glass has higher phosphorus pentoxide content and higher infrared light absorption intensity, and the blue glass has lower copper oxide content and longer center cut-off wavelength, for example, the blue glass has the center cut-off wavelength of about 670-.

The "center cut wavelength" mentioned above refers to a wavelength of light corresponding to a spectral transmittance curve of a filter (for example, a blue glass filter, an infrared cut filter formed by laminating a blue glass with an optical adhesive layer, or the like) in which a light transmittance is 50%.

According to some examples of the present application, the phosphorus pentoxide may be present in an amount of 60.1 to 75 wt%, for example, the phosphorus pentoxide may be present in an amount of 60.5%, may be 61 wt%, may be 61.4 wt%, may be 62 wt%, may be 63 wt%, may be 64 wt%, may be 64.5 wt%, may be 65 wt%, may be 66 wt%, may be 67 wt%, may be 68 wt%, may be 68.5 wt%, may be 69 wt%, may be 70 wt%, may be 71 wt%, may be 71.5 wt%, may be 72 wt%, may be 73 wt%, may be 73.5 wt%, may be 74 wt%, may be 74.5 wt%, and the like, based on the total mass of the blue glass. Therefore, when the content of the phosphorus pentoxide is in the range, the blue glass has high infrared absorption strength, good infrared cut-off effect and good service performance.

According to some examples of the present application, the copper oxide may be present in an amount of 0.5 to 2.5 wt%, for example, the copper oxide may be present in an amount of 0.55 wt%, may be 0.6 wt%, may be 0.7 wt%, may be 0.8 wt%, may be 0.85 wt%, may be 0.9 wt%, may be 1 wt%, may be 1.2 wt%, may be 1.3 wt%, may be 1.4 wt%, may be 1.5 wt%, may be 1.55 wt%, may be 1.6 wt%, may be 1.7 wt%, may be 1.8 wt%, may be 1.9 wt%, may be 2 wt%, may be 2.1 wt%, may be 2.2 wt%, may be 2.3 wt%, may be 2.35 wt%, may be 2.4 wt%, may be 2.45 wt%, etc., based on the total mass of the blue glass. Therefore, when the content of the copper oxide is within the above range, the center cut-off wavelength of the blue glass is longer, for example, the center cut-off wavelength of the blue glass can be 670-700nm, and the infrared cut-off filter formed by coating the optical adhesive layer and the like on the surface of the blue glass can better cut off infrared light, has less absorption to red light in visible light, has higher transmittance to visible light, and has good use performance.

According to some examples of the present application, the blue glass may further include: the fluorine element may be present in an amount of less than 10 wt%, for example, 9 wt%, 8 wt%, 7 wt%, 6 wt%, etc., based on the total mass of the blue glass. Therefore, when the content of the fluorine element in the blue glass is in the range, the transmittance of the blue glass in a visible light wave band can be improved, the strength of the thinner blue glass can be improved, and the comprehensive use performance of the blue glass can be improved.

According to some examples of the present application, the center cutoff wavelength of the blue glass may be 670-700nm, such as 675nm, 680nm, 685nm, 688nm, 690nm, 692nm, 695nm, 697nm, etc. Therefore, when the center cut-off wavelength of the blue glass is within the above range, even if the center cut-off wavelength of the formed infrared cut-off filter is shorter (for example, shorter by about 30 nm) after the optical adhesive layer is coated on the surface of the blue glass, the center cut-off wavelength of the whole infrared cut-off filter can reach about 630-.

In another aspect of the present application, an infrared cut filter is presented. According to some examples of the present application, the blue glass substrate in the infrared cut-off filter may be the blue glass described above, and thus, the infrared cut-off filter has all the features and advantages of the blue glass described above, and will not be described herein again. According to some examples of the present application, referring to fig. 1, the infrared cut filter 1000 includes: the blue glass substrate 100 and the optical cement layer 200 include, based on the total mass of the blue glass substrate 100: 60.1-75 wt% of phosphorus pentoxide and 0.5-2.5 wt% of copper oxide; the optical adhesive layer 200 is disposed on one side of the blue glass substrate 100, and the optical adhesive layer 200 can absorb infrared light, wherein the central cutoff wavelength of the infrared cutoff filter 1000 is 630-650 nm. Therefore, the infrared cut filter 1000 formed by the optical adhesive layer 200 is arranged on the surface of the blue glass substrate 100 with the component content, the center cut wavelength of the infrared cut filter 1000 is relatively long, the infrared cut filter 1000 can better cut off infrared light, has little absorption to red light in visible light and high transmittance to visible light, the intensity of the visible light sensed by the image sensor can be improved, and the shooting effect of an imaging product is improved.

According to some examples of the present application, the phosphorus pentoxide may be present in an amount of 60.1 to 75 wt%, for example the phosphorus pentoxide may be present in an amount of 60.5%, may be 61 wt%, may be 61.4 wt%, may be 62 wt%, may be 63 wt%, may be 64 wt%, may be 64.5 wt%, may be 65 wt%, may be 66 wt%, may be 67 wt%, may be 68 wt%, may be 68.5 wt%, may be 69 wt%, may be 70 wt%, may be 71 wt%, may be 71.5 wt%, may be 72 wt%, may be 73 wt%, may be 73.5 wt%, may be 74 wt%, may be 74.5 wt%, and the like, based on the total mass of the blue glass substrate 100. Therefore, when the content of the phosphorus pentoxide is within the above range, the blue glass substrate 100 has high infrared absorption strength, a good infrared cut-off effect, and good usability.

According to some examples of the present application, the copper oxide may be present in an amount of 0.5 to 2.5 wt%, for example, the copper oxide may be present in an amount of 0.55 wt%, may be 0.6 wt%, may be 0.7 wt%, may be 0.8 wt%, may be 0.85 wt%, may be 0.9 wt%, may be 1 wt%, may be 1.2 wt%, may be 1.3 wt%, may be 1.4 wt%, may be 1.5 wt%, may be 1.55 wt%, may be 1.6 wt%, may be 1.7 wt%, may be 1.8 wt%, may be 1.9 wt%, may be 2 wt%, may be 2.1 wt%, may be 2.2 wt%, may be 2.3 wt%, may be 2.35 wt%, may be 2.4 wt%, may be 2.45 wt%, etc., based on the total mass of the blue glass substrate 100. Therefore, when the content of the copper oxide is within the above range, the center cut-off wavelength of the blue glass substrate 100 is longer, for example, the center cut-off wavelength of the blue glass substrate 100 can be 670-700nm, and the infrared cut-off filter 1000 can better cut off infrared light, and has less absorption to red light in visible light, higher transmittance to visible light, and good performance.

According to some examples of the present application, the blue glass substrate 100 may further include: the fluorine element may be contained in an amount of less than 10 wt%, for example, may be 9 wt%, may be 8 wt%, may be 7 wt%, may be 6 wt%, and the like, based on the total mass of the blue glass substrate 100. Therefore, when the content of the fluorine element in the blue glass substrate is within the above range, the transmittance of the blue glass substrate in the visible light band can be improved, the strength of the thin blue glass substrate 100 can be improved, and the comprehensive use performance of the blue glass substrate 100 can be improved.

According to some examples of the present application, the thickness of the blue glass substrate 100 may be 0.1-0.3mm, for example, the thickness of the blue glass substrate 100 may be 0.12mm, may be 0.13mm, may be 0.145mm, may be 0.15mm, may be 0.16mm, may be 0.17mm, may be 0.18mm, may be 0.2mm, may be 0.21mm, may be 0.23mm, may be 0.25mm, may be 0.27mm, and the like. Therefore, the blue glass substrate 100 has a smaller thickness, and the infrared cut-off filter 1000 formed by the blue glass substrate 100 has a smaller thickness, so that when the blue glass substrate is applied to a camera assembly, the back focal length of the camera module can be reduced, the height of the camera assembly can be reduced to a great extent, and the camera assembly is beneficial to miniaturization and light and thin design; in addition, the infrared cut filter 1000 formed by the blue glass substrate 100 and the optical adhesive layer 200 has a good infrared cut effect and a high transmittance for visible light, and can further improve the shooting effect of the camera assembly.

According to some examples of the present application, the center cutoff wavelength of the blue glass substrate 100 may be 670-700nm, for example, 675nm, 680nm, 685nm, 688nm, 690nm, 692nm, 695nm, 697nm, etc. Therefore, when the center cut wavelength of the blue glass substrate 100 is within the above range, even if the center cut wavelength of the formed infrared cut filter 1000 is shorter (for example, shorter by about 30 nm) after the optical adhesive layer 200 is coated on the surface of the blue glass substrate 100, the center cut wavelength of the entire infrared cut filter 1000 may reach about 630-.

According to some examples of the present application, the optical adhesive layer 200 may absorb infrared light, so that an infrared cut effect of the infrared cut filter 1000 may be improved. Specifically, the optical adhesive layer 200 can also absorb ultraviolet light at the same time, so that interference of the ultraviolet light on spectral information acquired by the image sensor can be avoided, and the shooting effect of the camera assembly can be further improved. Specifically, the optical adhesive layer 200 may have two light absorption peaks, that is, the optical adhesive layer 200 may absorb infrared light and ultraviolet light at the same time, the wavelength range of the infrared band absorbed by the optical adhesive layer 200 may be 600-780nm, the wavelength range of the ultraviolet band absorbed by the optical adhesive layer 200 may be 350-420nm, and the light transmittances of the optical adhesive layer 200 in the infrared band and the ultraviolet band may not be greater than 1%, for example, the light transmittances of the optical adhesive layer 200 in the infrared band and the ultraviolet band may not be greater than 0.8%, and may not be greater than 0.5%. Therefore, the optical adhesive layer 200 has better infrared absorption performance and ultraviolet absorption performance, and can further improve the infrared cut-off effect of the infrared cut-off filter 1000, so that the infrared cut-off filter 1000 has an ultraviolet cut-off effect, and the shooting effect of the camera component can be further improved. Specifically, the light transmittance of the optical adhesive layer 200 in the visible light band of 450-600nm may be not less than 88%, for example, may be 90%. Therefore, the optical adhesive layer 200 has high light transmittance in the visible light band, so that the light transmittance of the ir-cut filter 1000 in the visible light band can be improved, and the photographing effect of the camera assembly using the ir-cut filter 1000 can be further improved.

According to some examples of the present application, the material forming the optical adhesive layer 200 is not particularly limited as long as it has infrared absorption properties, and in particular, the material forming the optical adhesive layer 200 may include: an ethylene oxide compound and a coloring compound that can adjust the absorption characteristics of the optical adhesive layer 200 with respect to light, for example, by selecting an appropriate coloring compound, the optical adhesive layer 200 can have good infrared absorption performance and ultraviolet absorption performance. Specifically, the thickness of the optical adhesive layer 200 may be 1 to 10 μm, for example, 2 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or the like. Therefore, when the thickness of the optical adhesive layer 200 is within the above range, the ir-cut effect and the visible light transmittance of the ir-cut filter 1000 can be better improved, and the thickness of the ir-cut filter 1000 is not significantly increased, which is beneficial to the light and thin design of the camera module.

According to some examples of the present application, the center cutoff wavelength of the infrared cutoff filter 1000 is 630-650nm, for example, 635nm, 640nm, 642nm, 645nm, 647nm, and the like. Therefore, when the central cutoff wavelength of the infrared cutoff filter 1000 is within the above range, the infrared light can be cut off well, and the absorption of red light in visible light is small, so that the intensity of visible light sensed by an image sensor in the camera assembly can be improved, and the shooting effect of an imaging product can be improved.

Specifically, the light transmittance of the ir-cut filter 1000 in the 700-1200nm band is not greater than 1%, for example, may be not greater than 0.8%, and may be not greater than 0.5%, etc., so that the ir-cut effect of the ir-cut filter 1000 is better, and the shooting effect of the camera assembly using the ir-cut filter 1000 can be further improved.

Specifically, the transmittance of the infrared cut-off filter 1000 in the visible light band of 400-700nm may be not less than 75%. For example, it may be 76%, 78%, 80%, etc. Therefore, the infrared cut-off filter 1000 has high transmittance to visible light, so that the intensity of the visible light sensed by the image sensor in the camera assembly can be improved, and the shooting effect of an imaging product is improved. Specifically, the infrared cut filter 1000 may have a transmittance of more than 15%, for example, 16%, 17%, 18%, 19%, 20%, or the like, for red light in the visible light band. Therefore, the infrared cut-off filter 1000 has less absorption of red light in visible light, can improve the intensity of visible light sensed by an image sensor in a camera assembly, improves the shooting effect of imaging products, and can better solve the problems of night scene noise, white balance imbalance, contrast reduction and the like caused by excessive red light information filtered by the infrared cut-off filter.

In yet another aspect of the present application, a camera assembly is presented. According to some examples of the present application, the camera assembly comprises: the camera and the infrared cut-off filter mentioned above, the camera has a light incident surface, and the infrared cut-off filter is arranged outside the light incident surface of the camera (the "outer side", that is, the side of the camera facing the external environment). Thus, the camera assembly has all the features and benefits of the infrared cut-off filter described above, and are not described herein again. Generally speaking, this camera subassembly can avoid because of infrared cut-off filter filters the night scene noise that too much red light information caused, contrast decline scheduling problem, and this camera subassembly's shooting effect is good, performance preferred.

In yet another aspect of the present application, an electronic device is presented. According to some examples of the present application, referring to fig. 2, the electronic device 1100 includes: casing 1200, the preceding camera subassembly 1300, mainboard and memory, screen (not shown in the figure), casing 1200 limits accommodation space, and camera subassembly 1300 sets up in accommodation space, and mainboard and memory are located accommodation space inside, and the screen setting is in accommodation space, and links to each other with the mainboard. Accordingly, the electronic device 1100 has all of the features and advantages of the camera assembly 1300 described above, and thus will not be described herein. In general, the camera assembly 1300 of the electronic device 1100 has good shooting effect and good usability.

For example, the electronic device may be any of various types of computer system devices that are mobile or portable and that perform wireless communications. Specifically, the electronic device may be a mobile phone or smart phone (e.g., iPhone (TM) based, Android (TM) based phone), a Portable game device (e.g., Nintendo DS (TM), PlayStation Portable (TM), Game boy Advance (TM), iPhone (TM)), a laptop, a PDA, a Portable Internet device, a music player and data storage device, other handheld devices, and the like.

The present invention is described below with reference to specific examples, which are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention. The examples do not specify particular techniques or conditions, according to techniques or conditions described in the literature in the field or according to the product specifications.

Example 1

Blue glass a was prepared. The blue glass A contains 65 wt% of phosphorus pentoxide, 1.5 wt% of copper oxide and 8 wt% of fluorine, and the thickness of the blue glass A is 0.1 mm.

Example 2

The surface of the blue glass a formed in example 1 is coated with an optical adhesive layer that can absorb infrared light as well as ultraviolet light at the same time to form an infrared cut filter a.

Comparative example 1

Blue glass B was prepared. The blue glass B contains 50 wt% of phosphorus pentoxide, 4.5 wt% of copper oxide and 8 wt% of fluorine, and the thickness of the blue glass A is 0.1 mm.

Comparative example 2

An optical cement layer (the composition, thickness, etc. of which are the same as those of the optical cement layer in example 2) was coated on the surface of the blue glass B formed in comparative example 1 to form an infrared cut filter B.

Performance testing

(1) The infrared cut-off spectra of the blue glass a and the blue glass B formed in example 1 and comparative example 1 were measured, and referring to fig. 3, it can be seen from fig. 3 that the center cut-off wavelength of the blue glass a in example 1 was about 680nm, and the center cut-off wavelength of the blue glass B in comparative example 1 was about 640 nm. Therefore, the center cutoff wavelength of the blue glass in the present application is long.

(2) The infrared cut filters a and B formed in example 2 and comparative example 2 were tested for light transmittance in the visible light range (400nm to 700nm), and the test results refer to table 1, fig. 4 and fig. 5, in which fig. 4 is a graph of the spectral transmittance of the infrared cut filter a in example 2 and fig. 5 is a graph of the spectral transmittance of the infrared cut filter B in comparative example 2.

Table 1: light transmittance data table of infrared cut-off filter A and infrared cut-off filter B in 400-700nm wave band

As can be seen from the above test data and fig. 4 and 5, the total light transmittance and the red light transmittance of the infrared cut-off filter a in example 2 are both higher (higher than that of comparative example 2), that is, the center cut-off wavelength of the blue glass in the present application is longer (about 680 nm), and after the optical adhesive layer is coated, the center cut-off wavelength of the infrared cut-off filter a formed by laminating the blue glass and the optical adhesive layer is also longer (about 640 nm), so that the infrared cut-off filter a in example 2 absorbs less red light in visible light, the red light transmittance is higher, the red light transmittance in example 2 is improved by about 6.5% compared with that in comparative example 2, and the total light transmittance is higher; the ir-cut filter a in comparative example 2 has a low total light transmittance and a low red light transmittance, the blue glass in comparative example 2 has a short center cut-off wavelength (about 640 nm), and the ir-cut filter B formed by laminating the blue glass and the optical adhesive layer after coating the optical adhesive layer has a short center cut-off wavelength (about 610 nm), so that the ir-cut filter B in comparative example 2 absorbs a large amount of visible light, has a low red light transmittance, and has a low total light transmittance. Therefore, in this application, after adjusting the content of phosphorus pentoxide and copper oxide in the blue glass, the center cut-off wavelength of the blue glass is improved, the infrared cut-off filter (blue glass superposed optical adhesive layer) in this application has a good infrared cut-off effect, and the absorption to red light is small, the transmittance to visible light is high, and the problems of night scene noise, white balance imbalance, contrast reduction and the like caused by excessive red light information filtered by the infrared cut-off filter of the camera component can be avoided.

The embodiments of the present application have been described in detail, but the present application is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and the simple modifications belong to the protection scope of the present application. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention.

In the description herein, references to the description of the terms "example," "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the example or example is included in at least one example or example of the application. In this specification, a schematic representation of the above terms does not necessarily refer to the same example or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more examples or examples. Furthermore, various examples or examples and features of various examples or examples described in this specification may be combined and combined by one skilled in the art without contradiction.

Although examples of the present application have been shown and described above, it is understood that the above examples are illustrative and are not to be construed as limiting the present application and that variations, modifications, substitutions and alterations in the above examples may be made by those of ordinary skill in the art within the scope of the present application.

Claims

1. An infrared cut-off filter is characterized by consisting of a blue glass substrate and an optical adhesive layer,

based on the total mass of the blue glass substrate, the blue glass substrate comprises: 60.1-75 wt% of phosphorus pentoxide and 0.5-2.5 wt% of copper oxide, wherein the center cut-off wavelength of the blue glass substrate is 670-700 nm;

the optical adhesive layer is arranged on one side of the blue glass substrate and can absorb infrared light, wherein the central cut-off wavelength of the infrared cut-off filter is 630-650nm, and the light transmittance of the optical adhesive layer in a visible light waveband of 450-600nm is not less than 88%;

the light transmittance of the infrared cut-off filter in the 700-1200nm wave band is not more than 1%.

2. The infrared cut filter according to claim 1, wherein the blue glass substrate has a thickness of 0.1 to 0.3 mm.

3. The infrared cut filter according to claim 1, wherein the blue glass substrate further comprises: a fluorine element, the fluorine element content being less than 10 wt% based on the total mass of the blue glass substrate.

4. The infrared cut filter according to claim 1, wherein the thickness of the optical cement layer is 1 to 10 μm.

5. The infrared cut filter according to claim 4, wherein a material forming the optical cement layer comprises: oxirane compounds and coloring compounds.

6. The IR-cut filter according to claim 4 or 5, wherein the optical adhesive layer can absorb the IR light and the UV light, the wavelength range of the IR band absorbed by the optical adhesive layer is 600-780nm, the wavelength range of the UV band absorbed by the optical adhesive layer is 350-420nm,

the light transmittance of the optical adhesive layer in the infrared band and the ultraviolet band is not more than 1%.

7. The IR-cut filter according to claim 1, wherein the transmittance of the IR-cut filter in the visible light band of 400-700nm is not less than 75%.

8. The infrared cut filter according to claim 7, wherein the infrared cut filter has a transmittance of more than 15% for red light in the visible light band.

9. A camera head assembly, comprising:

the camera is provided with a light incident surface;

the infrared cut filter of any one of claims 1 to 8, disposed outside the light incident surface of the camera.

10. An electronic device, comprising:

a housing defining an accommodating space;

the camera assembly of claim 9, disposed in the receiving space;

the main board and the memory are positioned in the accommodating space; and

and the screen is arranged in the accommodating space and is connected with the main board.