CN111031212A

CN111031212A - Blue glass optical filter, preparation method, camera module and electronic equipment

Info

Publication number: CN111031212A
Application number: CN201911330716.7A
Authority: CN
Inventors: 韦怡; 张海裕; 陈嘉伟; 周彦汝
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-04-17

Abstract

The application discloses a blue glass optical filter, a preparation method of the blue glass optical filter, a camera module and electronic equipment. The blue glass filter includes: a substrate formed of blue glass; a wavelength cut-off layer on a surface of one side of the base, the wavelength cut-off layer including a resin base material, an infrared light cut-off component and an ultraviolet light cut-off component, the infrared light cut-off component and the ultraviolet light cut-off component being dispersed inside the resin base material, the wavelength cut-off layer being configured to reduce transmittance of light in an infrared light band and an ultraviolet light band. Therefore, the blue glass filter has good infrared light and ultraviolet light cut-off functions and is simple in structure.

Description

Blue glass optical filter, preparation method, camera module and electronic equipment

Technical Field

The application relates to the field of electronic equipment, in particular to a blue glass optical filter, a preparation method, a camera module and electronic equipment.

Background

When a camera module which performs imaging based on image sensors such as a charge-coupled device image sensor (CCD) or a complementary metal oxide semiconductor image sensor (CMOS) performs imaging, if non-visible light (such as infrared light and ultraviolet light) received by the sensor is not filtered, the light can participate in image synthesis. However, since invisible light is invisible to the naked human eye, if the signal of invisible light is also converted into a digital signal synthesis pattern, there will be a difference between the synthesized image and the image observed by the naked human eye. The method is particularly characterized in that the color reducibility of the picture is poor, and the problems of ghost, stray light, color cast and the like exist in the imaging process. Therefore, in the current camera module, an infrared light cut-off filter is often disposed between the lens and the image sensor to filter and cut off the invisible light.

However, the current blue glass filter and the manufacturing method thereof, the camera module and the electronic device still need 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:

most of the existing infrared light cut-off filters used in camera modules are formed based on blue glass. The infrared light cut-off filter based on the blue glass mostly has the problem that the offset of front and rear central wavelengths is greatly changed when large-angle light enters. Specifically, the wavelength curve of the transmitted light may be inconsistent at different angles of incidence, resulting in purple fringing or glare in the captured image. On the other hand, most of the conventional infrared light cut-off filters cut off only light in the infrared light band, but do not form a very effective cut-off for light in the ultraviolet light band, so that the problem of color cast of a captured image cannot be completely solved. Therefore, if a filter having the infrared and ultraviolet light cut-off function and having a transmission spectrum that does not shift with the incident angle can be provided, the above problems will be alleviated or even solved at least to some extent.

In one aspect of the present application, there is provided a blue glass filter comprising: a substrate formed of blue glass; a wavelength cut-off layer on a surface of one side of the base, the wavelength cut-off layer including a resin base material, an infrared light cut-off component and an ultraviolet light cut-off component, the infrared light cut-off component and the ultraviolet light cut-off component being dispersed inside the resin base material, the wavelength cut-off layer being configured to reduce transmittance of light in an infrared light band and an ultraviolet light band. Therefore, the blue glass filter has good infrared light and ultraviolet light cut-off functions and is simple in structure.

In another aspect of the present application, a method of making a blue glass filter is presented. The method comprises the following steps: providing a substrate, the substrate being formed from blue glass; a wavelength cut-off layer is formed on a surface of one side of the base, the wavelength cut-off layer including a resin base, an infrared light cut-off component and an ultraviolet light cut-off component, the infrared light cut-off component and the ultraviolet light cut-off component being dispersed inside the resin base, and the wavelength cut-off layer being configured to reduce transmittance of light in an infrared light band and an ultraviolet light band. Thus, the blue glass filter having the infrared light and ultraviolet light cut-off function can be obtained easily.

In another aspect of the present application, a camera module is provided. This module of making a video recording includes: the camera assembly comprises at least one lens and is provided with a light inlet side and a light outlet side; the image sensor is positioned on the light emitting side of the camera assembly; the position of the blue glass filter is configured to enable light emitted from the light emitting side of the camera assembly to be received by the image sensor after passing through the blue glass filter, and the blue glass filter is the blue glass filter. Therefore, the blue glass filter in the camera module has all the characteristics and advantages of the filter, and the description is omitted here. Generally speaking, the camera module has at least one of the advantages of good infrared and ultraviolet light cutoff effect, thin thickness, low production cost and the like.

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 module is arranged in the accommodating space; a screen disposed in the accommodating space; mainboard and memory, mainboard and memory are located inside the accommodation space, the screen and the module of making a video recording respectively independently with the mainboard links to each other. Therefore, the electronic equipment has all the characteristics and advantages of the camera module, and the description is omitted here. Generally speaking, the camera module of the electronic device has at least one of the advantages of good shooting effect, thin thickness, low production cost and the like.

Drawings

FIG. 1 shows a schematic of a blue glass filter according to one example of the present application;

FIG. 2 shows a schematic view of a blue glass filter according to another example of the present application;

FIG. 3 shows a schematic view of a blue glass filter according to yet another example of the present application;

fig. 4 shows a schematic flow diagram of a method of making a blue glass filter according to one example of the present application;

fig. 5 shows a schematic structural diagram of a camera module according to an example of the present application;

FIG. 6 shows a schematic structural diagram of an electronic device according to an example of the present application;

fig. 7 shows a graph of spectral transmittance of a blue glass filter according to comparative example 1 of the present application;

fig. 8 shows a graph of spectral transmittance of a blue glass filter according to example 1 of the present application.

Description of reference numerals:

100: a substrate; 200: a wavelength cut-off layer; 310: a first coating layer; 320: a second film coating layer; 400: an anti-reflective layer; 1000: a camera module; 600: a camera assembly; 610: a first lens; 620: a second lens; 630: a third lens; 500: an image sensor; 2000: an electronic device.

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 filter is presented. Referring to fig. 1, the blue glass filter 1000 includes: a base body 100 formed of blue glass, and a wavelength cut-off layer 200. The wavelength cut-off layer 200 is located on a surface of one side of the base 100, and includes a resin base material, an infrared light cut-off component, and an ultraviolet light cut-off component. That is, the wavelength cut-off layer 300 may reduce the transmittance of light in the infrared band as well as the ultraviolet band. The infrared light cut-off component and the ultraviolet light cut-off component are dispersed in the resin base material. The blue glass filter has the advantages of good infrared light and ultraviolet light cut-off function, simple structure and the like.

For convenience of understanding, the following first briefly explains the principle that the blue glass filter can achieve the above beneficial effects:

as described above, although the blue glass filter in the related art can cut off part of the infrared light, there is a problem that the shift amount of the front and rear center wavelengths is greatly changed when a large angle light is incident. On the other hand, it is difficult to form a very effective cut-off for the light in the ultraviolet band, and thus the color cast problem of the photographed image cannot be completely solved. The blue glass filter according to the example of the present application forms the wavelength cut-off layer having both the infrared light cut-off function and the ultraviolet light cut-off function by mixing the infrared light cut-off component and the ultraviolet light cut-off component in the resin base material, so that the cut-off function of the filter for the infrared light and the ultraviolet light can be improved, and the structure of the filter can be simplified. Compared with the film system structure comprising a plurality of inorganic sub-layers with different refractive indexes, the wavelength cut-off layer taking the resin as the base material is lower in cost and simpler in preparation process.

According to a specific example of the present application, the infrared light cut component may absorb the infrared light, thereby implementing the infrared light cut function. Specifically, the infrared light cut component may include a pigment material having a maximum absorption peak at a wavelength of 600nm to 900 nm. More specifically, the pigment material may include a phthalocyanine-based compound. Specifically, a phthalocyanine-based dye can be used, and infrared light is absorbed by the nonionic conjugated skeleton. The phthalocyanine compound can have a maximum absorption peak in a 600-800 nm band, for example, at least one absorption peak in a 600-730 nm band. Therefore, most infrared rays with higher intensity in the ambient light can be effectively absorbed, so that the influence of the infrared rays on imaging can be well eliminated. The specific content of the pigment material in the wavelength cut-off layer 300 is not particularly limited and may be selected by those skilled in the art according to the actual circumstances.

According to examples of the present application, the ultraviolet light cut-off component may include a wavelength conversion material to convert ultraviolet light into visible light. Therefore, on one hand, the cutoff of ultraviolet light can be realized, and on the other hand, the light intensity of visible light received by the CCD can be improved. Specifically, the wavelength conversion material may include a rare earth doped oxide and at least one of an inorganic fluorescent compound and an organic fluorescent compound. In particular, in the present application, the term "rare earth doped oxide" is to be understood in a broad sense, that is, an inorganic substance containing a rare earth element and an oxygen element, and may be, for example, an oxide, a phosphate, an oxynitride, a silicate, a chlorate, a borate, a halophosphate, or the like. For example, the rare earth doped oxide may specifically be a halophosphate doped with elements including, but not limited to, Sr, Y, La, Tb, Eu, Tm, etc., such as chlorophosphate. The rare earth doped oxide may contain one rare earth element, or may contain two or more rare earth elements, and may be, for example, chlorophosphates containing Sr and Eu, chlorophosphates containing Y and Tb, chlorophosphates containing La and Tm, or the like. The organic fluorescent compound can be organic fluorescein, pyrene compounds or perylene compounds, rare earth metal complexes, transition metal complexes and the like. The specific content of the wavelength converting material in the wavelength cut-off layer 300 is not particularly limited, and may be selected by those skilled in the art according to the actual situation, for example, the mass ratio of the wavelength converting material to the resin base material may be 0.1% to 5%, for example, 0.3% to 3%.

According to the examples of the present application, the specific material of the resin base material is not particularly limited as long as the wavelength converting material and the pigment material described above can be well dispersed. More specifically, the resin base material may be formed of a resin that can be photo-cured or thermally cured. For example, specifically, it may be at least one of an acrylic acid value and a fluororesin.

According to a specific example of the present application, the thickness of the wavelength cut-off layer may be made not more than 10 μm. Accordingly, on the one hand, reliable infrared light and ultraviolet light cutoff can be achieved, and the light incident on the wavelength cutoff layer has a sufficiently long optical path in the wavelength cutoff layer, thereby sufficiently functioning with the infrared light cutoff component and the ultraviolet light cutoff component mixed in the wavelength cutoff layer. On the other hand, the wavelength cut layer having a thickness within the above range is not easily peeled off from the substrate of the blue glass due to the excessive thickness of the resin material.

According to the example of the invention, the blue glass filter provided by the application can enable the offset of the center wavelength of the spectrum curve of the transmitted light to be less than 5nm when the incident angle is changed between 0 and 40 degrees. For example, the shift of the center wavelength of the spectrum curve of the transmitted light can be made less than 5nm when the incident angle is changed between 0-30 degrees. It is specifically noted that the term "center wavelength" refers to a wavelength range of a wavelength band in which the absorption intensity is large, for example, more than 40%, in the spectral curve of transmitted light. In particular, for the blue glass filter according to the present application, the center wavelength may be 400-700 nm. Since the blue glass filter according to the example of the present application employs a wavelength cut-off layer in which the non-visible light is cut off by a strategy of absorbing infrared light and converting ultraviolet light into visible light, compared with a cut-off effect achieved by a film system design in the related art and by light acting between sublayers with high and low refractive indexes, the wavelength cut-off layer proposed in the present application is less affected by an incident angle, and thus can have a smaller central wavelength shift amount at different incident angles.

According to some examples of the present application, referring to fig. 2, in order to further improve the performance of the blue glass filter according to the examples of the present invention, the blue glass filter may further have at least one coating layer on a side of the wavelength cut layer away from the substrate, or on a side of the substrate away from the wavelength cut layer, such as 310 and 320 shown in fig. 2. The coating layer comprises a plurality of laminated sub-layers. For example, specifically, there may be two plating layers, which are respectively located on the side of the wavelength cut layer away from the base, and the side of the base away from the wavelength cut layer. The sub-layers included in the plating layer may be a high refractive index layer and a low refractive index layer which are laminated at a time, the material of the high refractive index layer may be, for example, titanium dioxide, trititanium pentoxide, zirconium dioxide, tantalum pentoxide, niobium pentoxide, H4, or the like, and the material forming the low refractive index layer may be silicon dioxide, magnesium fluoride, or the like. The plating layer formed by alternately laminating the high refractive index and the low refractive index can further reduce the transmittance of infrared light. Each coating may have a 20-26 sublayer structure. When the blue glass filter has only one coating layer, the number of the sub-layers included in the coating layer can be increased to 40-52, for example, and the coating layer is located on the side of the wavelength cut-off layer away from the substrate. Thus, the wavelength cut-off layer can be protected by the plating layer.

According to some examples of the present application, referring to fig. 3, in order to further improve the performance of the blue glass filter according to examples of the present invention, the blue glass filter may further include an anti-reflection layer 400. The anti-reflection layer 400 may be positioned at a side of the infrared light cut layer away from the substrate.

According to some examples of the present application, the substrate may be obtained by cutting and dicing blue glass. The blue glass for forming the substrate may include 60.1 to 75 wt% of phosphorus pentoxide, and 0.5 to 2.5 wt% of copper oxide. Specifically, the content of phosphorus pentoxide is 60.1 to 75 wt%, for example, the content of phosphorus pentoxide may be 60.5 wt%, 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%, or the like, based on the total mass of the blue glass. Therefore, when the content of the phosphorus pentoxide is within the range, the blue glass has high infrared light absorption intensity, good infrared light 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 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 blue glass filter can have a better infrared light cut-off effect by matching with the wavelength cut-off layer, and has the advantages of less absorption of red light in visible light, higher transmittance of the visible light and good use performance.

According to some examples of the present application, the blue glass may further include fluorine element, and the content of the fluorine element may be less than 10 wt%, for example, may be 9 wt%, may be 8 wt%, may be 7 wt%, may be 6 wt%, or the like, 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.

As will be appreciated by those skilled in the art, thinner blue glass filters are more advantageous for reducing the thickness of the camera module. However, the inventor finds that, on the premise of not changing the existing blue glass chemistry group, the thickness of the thinned blue glass is less than 0.15mm, and meanwhile, after the surface of the blue glass optical filter is coated with the wavelength cut-off layer with infrared absorption performance, the center cut-off wavelength of the formed blue glass optical filter is shorter by about 30nm, namely, the center cut-off wavelength reaches about 610nm, such a spectrum transmittance curve is not matched with the sensing spectrum of the image sensor, so that the red light information in the visible light can be excessively filtered, and further, the light intensity sensed by the image sensor is reduced, and the night scene noise problem is brought, and meanwhile, the white balance is also seriously influenced, the contrast is further seriously reduced, and the shooting effect of the camera module is influenced. In order to ensure a better infrared light cut-off effect while thinning the blue glass and avoid the above-mentioned problems caused by the shift of the central wavelength, the blue glass with a relatively longer central cut-off wavelength can be prepared in advance, for example, the central cut-off wavelength of the blue glass is about 670-700 nm. Therefore, after the infrared light cut film layer is compounded on the surface of the blue glass, the central cut wavelength of the formed infrared light cut filter is shortened (for example, shortened by about 30 nm), the infrared light can be cut off well, the absorption of the red light in the visible light is small, the visible light transmittance 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 light cut filter can be solved well. The inventor finds that phosphorus pentoxide is a glass network structure forming agent and can influence the absorption intensity of the blue glass on infrared light, and meanwhile, copper oxide has high light transmittance in a visible light band and has strong absorption characteristics in a near-infrared light band. Therefore, the content of the two components is adjusted, so that the absorption intensity of the blue glass to infrared light is higher, and the central cut-off wavelength is longer, for example, the central cut-off wavelength can be about 670-.

In another aspect of the present application, a method of making a blue glass filter is presented. The blue glass filter prepared by the method can have all the characteristics and advantages of the blue glass filter described above, and the description is omitted here. Specifically, referring to fig. 4, the method includes:

s100: providing a substrate formed of blue glass

According to some examples of the present application, a substrate is provided in this step. For example, the substrate may be obtained by subjecting blue glass to a process including, but not limited to, cutting, polishing, and the like. The chemical composition and thickness of the blue glass have been described in detail above and will not be described in detail.

S200: a wavelength cut-off layer is formed on one surface of the base body, and comprises a resin base material, an infrared light cut-off component and an ultraviolet light cut-off component

According to some examples of the present application, a wavelength cut-off layer is formed on one side of the base in this step. Specifically, the wavelength cut layer may be composed of a resin base material, and an infrared light cut component and an ultraviolet light cut component dispersed inside the resin base material. The specific chemical compositions of the resin substrate, the infrared light cut-off component and the ultraviolet light cut-off component have been described in detail above, and are not described in detail herein.

For example, according to some specific examples of the present application, an infrared light cut component and an ultraviolet light cut component may be added to raw materials for forming the resin base material and mixed in this step to form a mixed material. The mixture may then be coated on a surface of one side of the substrate and subjected to a curing process to form a wavelength cut-off layer.

According to an example of the present application, the method may further include a step of forming a plating layer and an anti-reflection layer, the manner of forming the plating layer and the anti-reflection layer is not particularly limited, and a person skilled in the art may select a familiar method to form the plating layer and the anti-reflection layer. For example, the plating layer and the anti-reflective layer may be formed by means including, but not limited to, sputtering, deposition.

In yet another aspect of the present application, a camera module is provided. Referring to fig. 5, the camera module 1000 includes: a camera assembly 600, the aforementioned blue glass filter, and an image sensor 500. The camera assembly 600 includes at least one lens, such as may include a first lens 610, a second lens 620, and a third lens 630 as shown in the figures. The camera assembly has a light incident side and a light emitting side, the image sensor 500 is located on the light emitting side of the camera assembly 300, the blue glass filter is located in a position such that light emitted from the light emitting side of the camera assembly can be received by the image sensor after passing through the infrared light cut-off filter, and ambient light can be incident to the camera module 1000 in a direction indicated by an hv arrow in the figure.

As mentioned above, the blue glass filter in the camera module can be the above blue glass filter. That is, may include the substrate 100 and the wavelength cut-off layer 200. Therefore, the camera module can at least have all the characteristics and advantages of the blue glass filter, such as at least one of the advantages of thin thickness, good optical cut-off performance, low production cost and the like.

In yet another aspect of the present application, an electronic device is presented. According to some examples of the present application, referring to fig. 6, the electronic device 2000 comprises: a housing, the aforementioned camera module 1000, a main board, and a memory (not shown). The shell defines an accommodating space, and the camera module is arranged in the accommodating space. Inside mainboard and memory also were located accommodation space, the screen and the module of making a video recording link to each other with the mainboard respectively independently. Thus, the electronic device 2000 has all the features and advantages of the camera module 1000, which are not described herein again. Generally speaking, the camera module of the electronic device has at least one of the advantages of good shooting effect, low production cost and the like.

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. In particular, the electronic device may be a mobile or smart phone (e.g., iPhone, Android, based), a portable gaming device (e.g., Nintendo DS, PlayStationPortable, Game Advance, iPhone), a laptop, a PDA, a portable Internet appliance, 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

The blue glass with the thickness of 0.11mm is used as a matrix, one side surface of the matrix is coated with a wavelength cut-off layer which takes polyacrylic acid as a resin base material and contains phthalocyanine compounds (pigment materials) and rare earth doped chlorophosphate compounds (wavelength conversion materials), and the thickness of the wavelength cut-off layer is 8 microns.

The side of the wavelength cut-off layer far away from the substrate and the side of the substrate far away from the wavelength cut-off layer are provided with coatings, the coating structures on the two sides are consistent, and the coatings are of a structure that a high refractive index layer and a low refractive index layer with 26 sub-layers are sequentially laminated.

Comparative example 1

The remaining structure was the same as in example 1, except that no wavelength cut-off layer was provided.

The transmittances at 350-1200nm of example 1 and comparative example 1 were measured with each 1 degree change using a simulated solar light source as the light source and an incident angle of 0-30 degrees, respectively. Referring to fig. 7 and 8, in comparative example 1 without the wavelength cut-off layer, the transmission spectral curves at the incident angles of 0 degree and 30 degree are not well overlapped, and in particular, referring to fig. 7, the spectral curves of the sample of comparative example 1 at about 400nm and 680 nm and 700nm have significant differences. Referring to fig. 8, the samples obtained in example 1 have better consistency in the transmission spectrum curves measured at different angles of incidence (0 degrees and 30 degrees) and have better cutoff effects on light rays in the ultraviolet and infrared portions.

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. A blue glass filter, comprising:

a substrate formed of blue glass;

a wavelength cut-off layer on a surface of one side of the base, the wavelength cut-off layer including a resin base material, an infrared light cut-off component and an ultraviolet light cut-off component, the infrared light cut-off component and the ultraviolet light cut-off component being dispersed inside the resin base material, the wavelength cut-off layer being configured to reduce transmittance of light in an infrared light band and an ultraviolet light band.

2. The blue glass filter according to claim 1, wherein the infrared light cut component includes a pigment material having a maximum absorption peak at a wavelength of 600nm to 900 nm.

3. The blue glass filter according to claim 2, wherein the pigment material comprises a phthalocyanine-based compound.

4. The blue glass filter according to claim 1, wherein the ultraviolet light cut component comprises a wavelength converting material that converts ultraviolet light to visible light.

5. The blue glass filter according to claim 4, wherein the wavelength converting material comprises at least one of a rare earth doped oxide and an organic fluorescent compound.

6. The blue glass filter according to claim 1, wherein the infrared light cut-off layer has a thickness of not more than 10 μm;

optionally, when the incidence angle of the blue glass filter is changed between 0 and 40 degrees, the shift of the central wavelength of the spectrum curve of the transmitted light is less than 5 nm.

7. The blue glass filter according to claim 1, further comprising:

the coating layer is positioned on one side of the wavelength cut-off layer far away from the base body or on one side of the base body far away from the wavelength cut-off layer, and the coating layer comprises a plurality of laminated sub-layers.

8. The blue glass filter according to claim 1, further comprising: and the antireflection layer is positioned on one side of the infrared light cut-off layer, which is far away from the base body.

9. The method of claim 1, wherein the blue glass comprises 60.1 to 75 wt% phosphorous pentoxide, and 0.5 to 2.5 wt% copper oxide,

optionally, the thickness of the blue glass is less than 0.15 mm.

10. A method of making a blue glass filter, comprising:

providing a substrate, the substrate being formed from blue glass;

a wavelength cut-off layer is formed on a surface of one side of the base, the wavelength cut-off layer including a resin base, an infrared light cut-off component and an ultraviolet light cut-off component, the infrared light cut-off component and the ultraviolet light cut-off component being dispersed inside the resin base, and the wavelength cut-off layer being configured to reduce transmittance of light in an infrared light band and an ultraviolet light band.

11. The method of claim 10, wherein the forming a wavelength cutoff layer comprises:

adding the infrared light cut component and the ultraviolet light cut component to a raw material for forming the resin base material and mixing to form a mixed material;

and coating the mixture on the surface of one side of the substrate, and carrying out curing treatment to form the wavelength cut-off layer.

12. The utility model provides a module of making a video recording which characterized in that includes:

the camera assembly comprises at least one lens and is provided with a light inlet side and a light outlet side;

the image sensor is positioned on the light emitting side of the camera assembly;

a blue glass filter positioned such that light emitted from the light-emitting side of the camera assembly is received by the image sensor after passing through the blue glass filter, the blue glass filter being as claimed in any one of claims 1 to 9.

13. An electronic device, comprising:

a housing defining an accommodating space;

the camera module of claim 12, disposed in the receiving space;

a screen disposed in the accommodating space;

mainboard and memory, mainboard and memory are located inside the accommodation space, the screen and the module of making a video recording respectively independently with the mainboard links to each other.