CN110865432A

CN110865432A - Blue glass, preparation method, camera module and electronic equipment

Info

Publication number: CN110865432A
Application number: CN201911099609.8A
Authority: CN
Inventors: 韦怡
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: 2020-03-06
Also published as: WO2021093544A1

Abstract

The application discloses blue glass, a preparation method of the blue glass, a camera module and electronic equipment. The method comprises the following steps: cutting the blue glass raw material; slicing to obtain a blue glass rough blank; grinding the blue glass rough blank; performing a double-sided physical polishing process, the double-sided physical polishing process comprising at least 3 polishing stages: the pressure of the polishing disc to the blue glass rough blank in the pressurization polishing stage is larger than that of the polishing disc to the blue glass rough blank in the initial polishing stage, and the pressure of the polishing disc to the blue glass rough blank in the decompression polishing stage is smaller than that in the pressurization polishing stage. The method can reduce the thickness of the blue glass raw material to be less than 0.15mm, has better product yield, and has the advantages of easy popularization, lower equipment cost and the like.

Description

Blue glass, preparation method, camera module and electronic equipment

Technical Field

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

Background

Current camera modules used in electronic devices generally use image sensors such as Charge Coupled Device (CCD) image sensors or Complementary Metal Oxide Semiconductor (CMOS) image sensors to perform imaging. Specifically, the image sensor converts light transmitted from the lens into an electrical signal, and then converts the electrical signal into a digital signal, and displays the digital signal on a screen to form an image after a series of processing. However, the effective light for imaging is concentrated in the visible light band, but non-visible light (such as infrared and ultraviolet light) is also received when the sensor receives the light transmitted by the lens. This portion of light, although invisible to the unaided human eye, will participate in the composition of the image, i.e., this portion of light will also be converted into a digital signal, resulting in a difference between the combined image and the image observed by the unaided human eye.

Although this problem can be improved to some extent by disposing an infrared cut filter between the lens and the image sensor, the current blue glass, particularly the blue glass for forming an infrared cut filter, and the manufacturing method, the camera module and the electronic device thereof are still in need of improvement.

Disclosure of Invention

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

at present, most of infrared cut-off filters used in camera modules are formed based on blue glass. The infrared cut-off effect of the blue glass is greatly influenced by the thickness of the blue glass, the infrared cut-off effect can be realized when the thickness of the blue glass filter is larger (for example, 0.21mm), 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 at the same time: when the thickness of the ir cut-off filter is 021mm, FBL (forcersbarrierielgth, the distance from the center of the lens at the focusing position to the imaging surface) needs to be more than 0.9mm, and TTL (total track length, the distance from the center point of the first lens to the imaging surface) of the camera module office cannot be reduced. That is, although the infrared cut-off effect can be ensured by using a thick infrared cut-off filter, the overall thickness of the camera module is increased, and the transmittance of the visible light portion is reduced. In addition, the optical performance and the thickness of the blue glass are related, the filtering performance of the infrared cut-off filter can be changed when the thickness of the blue glass is simply reduced, and the reduction process is difficult to achieve. Therefore, if a blue glass with proper thickness and a preparation method thereof can be provided, the problems can be alleviated or even solved at least to a certain extent.

In one aspect of the present application, a method of making a blue glass is presented. The method comprises the following steps: cutting the blue glass raw material; slicing the blue glass raw material subjected to the cutting treatment to obtain a blue glass rough blank; grinding the blue glass rough blank; and carrying out double-sided physical polishing treatment on the ground blue glass rough blank, wherein the double-sided physical polishing treatment comprises at least 3 polishing stages: the pressure of the polishing disc to the blue glass rough blank in the pressurization polishing stage is greater than that in the initial polishing stage, and the pressure of the polishing disc to the blue glass rough blank in the decompression polishing stage is less than that in the pressurization polishing stage. The method can reduce the thickness of the blue glass raw material to be less than 0.15mm, has better product yield and better compatibility with the existing glass thinning process, can realize production by simply improving the existing glass thinning production line, and further has the advantages of easy popularization, lower equipment cost and the like.

In another aspect of the present application, a blue glass is presented. The blue glass is prepared based on the method described previously. The blue glass thus has all the features and advantages of the product obtained by the method described above, and will not be described in detail here. Generally speaking, the blue glass has at least one of the advantages of thin thickness, good optical cut-off performance, low production cost and the like.

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 the camera assembly 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 infrared cut-off filter is arranged at a position which enables the light emitted by the light emitting side of the camera assembly to pass through the infrared cut-off filter and then be received by the image sensor. Therefore, the infrared cut-off filter in the camera module has all the characteristics and advantages of the blue glass, and the description is omitted. Generally speaking, the camera module has at least one of the advantages of good infrared cut-off 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 flow diagram of a method of making blue glass according to one example of the present application;

FIG. 2 shows a schematic flow diagram of a method of making blue glass according to another example of the present application;

FIG. 3 shows a schematic partial flow diagram of a method of making blue glass according to one example of the present application;

FIG. 4 shows a schematic view of a blue glass structure 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 blue glass according to an example of the present application.

Description of reference numerals:

100: a blue glass substrate; 200: an optical adhesive layer; 1000: an electronic device; 1100: a housing; 1200: a camera module; 300: a camera assembly; 310: a first lens; 320: a second lens; 330: a third lens; 400: an image sensor.

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 method of making a blue glass is presented. The method can simply and conveniently obtain the blue glass with the thickness less than 0.15mm, and the blue glass with the thickness can be used as the infrared cut-off filter of the camera module and has the advantages of thin thickness, capability of reducing the whole thickness of the camera module, good infrared cut-off performance and the like.

For the convenience of understanding, the following first briefly explains the principle by which the blue glass prepared by the method can obtain the above-mentioned advantageous effects:

as mentioned previously, the optical properties of blue glass are related to its thickness. The reduction of the thickness of the blue glass can result in the reduction of the absorption of the infrared band (700-1200nm), and the infrared cut-off effect is weakened. Although the infrared cut-off film layer can be added to improve the cut-off effect of infrared light, the center cut-off wavelength of the blue glass with reduced thickness is shifted to the short wave direction after the blue glass is matched with the existing infrared cut-off film layer, so that the transmittance of the blue glass to the visible light region is reduced, especially the transmittance of the blue glass to red light in visible light is reduced. Therefore, simply reducing the thickness of the blue glass also causes distortion of the image of the light synthesized by the filtering of the infrared cut filter. In addition, the thickness of less than 0.15mm is more strict on the thinning process of the blue glass. The product yield processed according to the existing thinning process is low, and the blue glass fragment condition is serious.

According to the method, the damage of the thinning treatment to the blue glass is reduced by adopting sectional type double-sided physical polishing, the polishing pressure and the rotating speed of the polishing disc can be gradually increased by sectional type polishing treatment, and the fragment risk in the thinning process is reduced. Therefore, the blue glass with better optical performance and thinner thickness can be simply obtained, and the yield of the produced product can be ensured. In particular, the "center cut-off wavelength" in the present application refers to the wavelength of light corresponding to a transmittance curve where the transmittance is 50%.

Referring to fig. 1, the method includes steps that may include:

s100: cutting treatment is carried out on the blue glass raw material

According to an example of the present application, the blue glass raw material is subjected to a blanking process in this step. Specifically, a blue glass plate with a large thickness and a large area can be used as a raw material, and the blue glass raw material is cut as required to realize cutting treatment. For example, the blanking process may be performed using a glass blanking machine. Therefore, the area of the blue glass raw material can be reduced, and the subsequent treatment is convenient.

S200: slicing the blue glass raw material to obtain a blue glass rough blank

According to an example of the present application, the reduced-volume blue glass raw material is subjected to a slicing process in this step to obtain a blue glass blank. Specifically, the slicing process can further reduce the size of the raw blue glass material, so that the area of the cut blue glass rough blank is close to the size of the blue glass which needs to be finally obtained.

Specifically, a diamond wire cutting apparatus may be employed for the slicing process. The diameter range of the diamond wire can comprise 0.14-0.16 mm, and the grain size range of the diamond on the diamond wire can comprise 30-40 mu m. The diamond wire can move at a speed of 12-15 m/s during slicing treatment, and the moving speed of the blue glass relative to the diamond wire can be in a range of 0.2-0.3 mm/min. When the slicing treatment is carried out, the cutting fluid can be continuously sprayed to the diamond wire. The cutting fluid can contain diamond particles with the particle size of 20-30 mu m and corundum particles with the particle size of 50-60 mu m. This improves the efficiency of the slicing process and prevents the occurrence of defects such as breakage and edge breakage of the blue glass in the slicing process.

In order to further improve the quality of the blue glass prepared by the method, referring to fig. 2, before the slicing process, the method may further include:

s10: edging the edge of the blue glass subjected to the cutting treatment

According to some specific examples of the present application, the edge grinding process may be performed on the corner of the blue glass wafer using a diamond grinding wheel of a numerically controlled machine tool at this step. Thus, before the slicing process, the relatively sharp edge formed after the blanking process can be removed, and the effect of the slicing process can be improved.

In addition, after the slicing process and before the grinding process, the method may further include:

s20: cutting the edge of the blue glass rough blank to form a round angle

According to some examples of the present application, after obtaining the blue glass blank, the edges of the blue glass blank may be cut to form a rounded corner. Therefore, the edge of the blue glass rough blank can be further smoothened, and sharp edges or edges with folding corners in the subsequent steps are prevented from being cracked, so that defects and slight cracks in the blue glass are prevented from being increased.

Specifically, the blue glass blank can be installed on a CNC machine tool, and is sucked and fixed through a vacuum chuck. And moving the sucker above a grinding wheel on the CNC numerical control machine tool, and grinding the edge of the blue glass rough blank by using the grinding wheel to form a fillet. For example, the grinding wheel can be controlled to rotate at the speed of 500-600 rpm/min, and the suction cup can be adjusted to swing downwards to be in contact with the grinding wheel. Thus, the formation of the fillet can be realized under relatively mild conditions.

S300: grinding the blue glass rough blank

According to some examples of the present application, the blue glass blank may be ground during this step. For example, the blue glass preform may be ground by a grinder. The grinding liquid can be added during grinding, and the rotating speed range of the grinding disc can include 1000-1200 rpm/min. The components of the polishing slurry are not particularly limited as long as the particles in the polishing slurry have a suitable size, do not damage the surface of the blue glass, and do not chemically react with the blue glass. For example, according to some specific examples of the present application, the slurry may contain alumina particles having a particle size ranging from 3 to 6 μm, and may further contain 0.5 to 2 wt% of cubic boron nitride powder having a particle size of 10 to 20 μm, 14 to 16 wt% of alkylphenol ethoxylate, 4 to 6 wt% of glycerin, 9 to 11 wt% of polypropylene glycol 400, and the balance of water, such as deionized water. After the grinding is finished, the ground blue glass rough blank can be cleaned by absolute ethyl alcohol so as to remove the grinding liquid remained on the surface of the blue glass rough blank.

According to some examples of the present application, the specific duration of the grinding process is not particularly limited, and one skilled in the art can adjust the thickness of the blue glass blank according to the thickness of the final blue glass product. For example, according to some examples of the present application, the thickness of the finished blue glass may be 0.15mm or less, specifically 0.13mm, 0.12mm, and 0.11mm, and the thickness of the ground blue glass blank may be about 0.17 mm. For example, it may be about 0.175 mm.

S400: double-sided physical polishing of the blue glass blank, the double-sided physical polishing comprising at least 3 polishing stages

According to some examples of the present application, the blue glass blank is thinned in this step by double-sided physical polishing. The inventor finds that in the step, by adopting a sectional polishing mode, the polishing pressure of different working sections is increased and then reduced, so that the defects of fragments and the like in the polishing process caused by overlarge polishing pressure can be avoided, the reduction thickness of the process of double-sided physical polishing treatment for ensuring the yield is larger, the blue glass with thinner thickness can be obtained, and the product yield of the method is effectively improved. The specific operation of the double-sided physical polishing in this step is not particularly limited, and for example, the blue glass blank may be first placed in a fixture, the height of which is slightly smaller than the thickness of the blue glass blank, i.e., the blue glass blank has a portion exposed outside the fixture, so that the blue glass blank can be thinned by polishing with a polishing disk. The blue glass was then physically polished using a polishing pad. More specifically, double-sided physical polishing may be performed using a polishing tool such as a pinion.

Specifically, according to some examples of the present application, the double-sided physical polishing process may include at least 3 polishing stages: an initial polishing stage, a pressurized polishing stage, and a depressurized polishing stage. The pressure of the polishing disk against the blue glass blank is kept constant in each polishing stage, and the pressure of the polishing disk against the blue glass blank is increased or decreased in the next polishing stage. Specifically, the initial polishing stage with a smaller polishing pressure (the pressure of the polishing disk on the blue glass rough blank) is adopted for polishing and thinning, and then the polishing pressure is increased to enter a pressurization polishing stage. Subsequently, in order to prevent the glass from being broken due to collision between the blue glass rough blank and the polishing clamp caused by directly stopping polishing in the polishing stage with larger polishing pressure, the pressure-reducing polishing stage is carried out after the pressure-increasing polishing stage is completed. That is, the pressure of the polishing disk on the blue glass rough blank in the pressurization polishing stage is greater than the pressure of the polishing disk on the blue glass rough blank in the initial polishing stage, and the pressure of the polishing disk on the blue glass rough blank in the decompression polishing stage is less than that in the pressurization polishing stage. More specifically, the rotation speed of the polishing disk in several polishing stages may also have a tendency to increase and then decrease, namely: the rotating speed of the polishing disk in the pressurization polishing stage is greater than that of the polishing disk in the initial polishing stage, and the rotating speed of the polishing disk in the decompression polishing stage is less than that of the polishing disk in the pressurization polishing stage. The rotational speed of the polishing disk can be maintained constant during each polishing stage.

According to some examples of the present application, in order to prevent the breakage caused by the excessive polishing pressure and rotation speed when the double-sided physical polishing is started, the pressure of the polishing disk on the blue glass rough blank in the initial polishing stage can be controlled to be less than 0.1MPa, and the rotation speed of the polishing disk is less than 1000 rpm/min. Thereby, polishing can be started under milder conditions.

The inventor finds that if the double-sided physical polishing treatment is not performed by sectional polishing, but is performed by directly using fixed polishing pressure and polishing rotation speed, in order to ensure the thinning effect, the thickness of the blue glass rough blank subjected to the double-sided physical polishing treatment can be thinned to be less than 0.15mm, and then larger polishing pressure is needed. The large initial polishing pressure and the large rotation speed are easy to cause the blue glass rough blank to be broken in the initial stage of polishing, and the product yield is more than about 30 percent. By adopting the sectional type double-sided physical polishing, the product yield can be greatly improved.

According to some specific examples of the present application, double-sided physical polishing may be performed in five stages. Specifically, referring to fig. 3, the double-sided physical polishing process may specifically include the following steps:

s410: first polishing stage

According to an example of the present application, the polishing pressure range in the first polishing stage may include 0.01 to 0.04Mpa, and the rotation speed range of the polishing disk may include 300 to 600 rpm/min. The polishing time is not particularly limited and can depend on the specific thickness of the blue glass blank and the thickness requirements of the final blue glass product. Specifically, it may be 3 to 15 min.

S420: second polishing stage

According to an example of the present application, the pressure range of the polishing disk in the second polishing stage may include 0.05 to 0.09Mpa, the rotation speed range of the polishing disk may include 650 to 900rpm/min, and the polishing time may be 3 to 15min, for example, which may be the same as the first polishing stage.

S430: third polishing stage

According to an example of the present application, the pressure range of the polishing disk in the third polishing stage may include 0.1 to 0.15Mpa, and the rotation speed range of the polishing disk may include 950 to 1200 rpm/min. The third polishing stage may be a polishing stage with the maximum polishing pressure and rotation speed, and the polishing time of this stage may be longer, for example, the polishing time range may include 100-. Because the blue glass rough blank is subjected to two polishing stages with increased polishing pressure before the third polishing stage, the thickness of the blue glass rough blank can be well and intensively thinned by higher polishing pressure and rotating speed and longer polishing time without causing great reduction of the product yield.

S440: the fourth polishing stage

According to the example of the application, the polishing pressure and the rotation speed of the polishing disk can be reduced in the fourth polishing stage, so that the situation that the polishing is stopped directly after the third polishing stage with larger pressure and rotation speed is completed to cause more violent collision between the clamp and the blue glass rough blank is prevented. Specifically, the pressure range of the polishing disk on the blue glass rough blank in the polishing stage can include 0.05-0.09 Mpa, and the rotating speed range of the polishing disk can include 300-600 rpm/min. The polishing time of the fourth stage may be short, for example, 2 to 10 min.

S450: a fifth polishing stage

The fifth polishing stage can continuously reduce the polishing pressure and the polishing rotating speed, so that the inertia caused by high rotating speed and large polishing pressure in the third stage can be further relieved, and the phenomenon that the clamp and the blue glass are strongly collided due to the trade stop of polishing is prevented. The pressure range of the polishing disk to the blue glass in the step can include 0.01-0.04 Mpa, and the rotating speed of the polishing disk can be controlled to be not more than 300 rpm/min. Similarly, the polishing time of the fifth stage may be short, for example, between 2-5 min.

According to the application example, the double-side physical polishing is carried out by 5 sections, so that the polishing yield can be improved to about 80-85%. Therefore, a more ideal polishing yield can be obtained. The inventors found that although the product yield can be further improved by further increasing the polishing stages and reducing the difference between the polishing pressures of two adjacent polishing stages, the further increase of the process steps has a limited improvement on the product yield, and will greatly prolong the working hours, resulting in a reduction in the production efficiency.

According to the example of the application, in order to further improve the polishing effect and avoid the reduction of the production yield caused by continuous thinning under a larger polishing pressure, the double-sided physical polishing treatment can be repeated for multiple times. Specifically, the above-described double-side physical polishing process may be repeated 3 times, that is, 3 times of the double-side physical polishing process divided into 5 polishing stages may be performed. The thickness of the blue glass rough blank thinned by each double-sided physical polishing treatment can be not more than 20 micrometers, the clamp can be replaced after the double-sided physical polishing treatment is carried out once, and the replaced clamp can be thinner than the originally used clamp. Therefore, the product yield of the method can be further improved, and the finally obtained blue glass can be thinned to 0.15mm, for example to 0.11 mm. The inventors have found that as the blue glass is thinned, the spectral characteristics of the blue glass also change. Referring to fig. 7, the blue glass having a thickness of 0.11mm is most similar to the existing conventional blue glass having a thickness of 0.21mm in the characteristics of the optical spectrum (line type of transmittance curve, peak position, etc.). Therefore, reducing the thickness to 0.11mm can shorten the overall thickness of the camera module using the blue glass, and can keep the spectral performance of the blue glass from being changed too much, and it is necessary to adjust the overall optical characteristics of the sheet by additionally adjusting other structures of the infrared cut filter (such as the infrared cut film layer).

According to the examples of the present application, since the thickness of the blue glass prepared by the method proposed by the present application is thin, the time required for the polishing and thinning process is also long. Compared with chemical polishing, especially chemical polishing with alkaline polishing liquid, the double-sided physical polishing method can prevent alkaline solution (such as KOH) from corroding blue glass, and further avoid bad appearance caused by corrosion of the polishing liquid, such as film mark, watermark and the like.

As mentioned above, the optical performance of the blue glass is also changed after the thickness of the blue glass is reduced, and particularly, the central cut-off wavelength of the whole sheet is shifted to a short wavelength direction after the blue glass is matched with a conventional infrared cut-off film layer. Therefore, the content of phosphorus in the raw material of the blue glass can be properly increased to adjust the optical performance of the blue glass, so that the thickness can be reduced and the visible light transmittance can be improved. Specifically, the blue glass, or blue glass raw material, may include 60.1 to 75 wt% of phosphorus pentoxide and 0.5 to 2.5 wt% of copper oxide. According to some examples of the present application, double-sided physical polishing can avoid chemical reaction between the alkaline solution and the blue glass with higher phosphate ratio, thereby avoiding affecting the spectral curve of the blue glass.

Particularly, after the film layer that has infrared absorption performance at the thin blue glass surface coating of thickness, can lead to the blue glass light filter's that forms central cutoff wavelength about 30nm short, central cutoff wavelength has arrived about 610nm promptly, such spectral transmittance curve does not match with image sensor's response spectrum, can filter out red light information in the visible light too much, and then reduced the luminous intensity of image sensor response on the one hand, bring night scene noise problem, white balance has still seriously been influenced simultaneously, more serious can lead to the contrast to descend, influence the shooting effect of camera module. In order to ensure a good infrared 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 having a relatively long central cut-off wavelength may be prepared in advance, for example, the central cut-off wavelength of the blue glass is about 670-700 nm. Therefore, after the infrared cut film layer is compounded on the surface of the blue glass, the central cut wavelength of the formed infrared cut filter is shortened (for example, shortened by about 30 nm), infrared light can be cut off well, the absorption of red light in visible light is small, the visible light transmittance is high, and therefore 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 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 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-.

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 surface of the blue glass with an optical adhesive layer and the like 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 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.

In another aspect of the present application, a blue glass is presented. The blue glass may be prepared by the method described above. The blue glass thus has all the features and advantages of the blue glass obtained by the method described previously and will not be described in detail here. For example, the blue glass has at least one of the advantages of thin thickness, good optical cut-off performance, low production cost and the like.

The chemical composition and thickness of the blue glass have been described in detail above, and are not described in detail here. As mentioned above, the blue glass can be used for preparing an infrared cut-off filter in the camera module, and the blue glass can be used as a substrate of the infrared cut-off filter and matched with a film layer with an infrared cut-off function, so that the cut-off performance of the sheet material on infrared light can be further improved. For example, referring to fig. 4, an infrared cut filter formed using the blue glass may have a blue glass substrate 100 and an optical cement layer 200. The optical adhesive layer 200 may absorb infrared light, so that an infrared cut-off effect of the infrared cut-off filter 1000 may be improved. Specifically, the optical adhesive layer 200 may be an adhesive layer having an infrared absorption function, and may be formed by adding a pigment material to a material including, but not limited to, acrylic, fluorine resin, and the like. In addition, the optical cement layer can also absorb ultraviolet light simultaneously, from this, can avoid the ultraviolet light to cause the interference to the spectral information that image sensor obtained, can further improve the shooting effect of the module of making a video recording. 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, the infrared cut-off effect of the infrared cut-off filter can be further improved, the infrared cut-off filter has an ultraviolet cut-off effect, and the shooting effect of the camera module can be further improved.

In yet another aspect of the present application, a camera module is provided. Referring to fig. 5, the camera module 1200 includes: a camera assembly 300, an infrared cut filter, and an image sensor 400. The camera assembly includes at least one lens, and may include, for example, a first lens 310, a second lens 320, and a third lens 330 as shown in the figures. The camera assembly has a light-in side and a light-out side, the image sensor 400 is located on the light-out side of the camera assembly 300, the position of the infrared cut-off filter is configured to enable light emitted from the light-out side of the camera assembly to be received by the image sensor after passing through the infrared cut-off filter, and the propagation direction of the ambient light can be shown by a straight arrow in the figure.

The infrared cut filter may include a blue glass substrate 100 and an optical cement layer 200. The blue glass substrate 100 may be the blue glass described above. Therefore, the camera module can at least have all the characteristics and advantages of the blue glass, 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 1000 includes: a casing 1100, the camera module 1200, 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 1100 has all the features and advantages of the camera module 1200 described above, and thus, the description thereof is omitted. 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.

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

Selecting a blue glass raw material with 65 wt% of phosphorus pentoxide, 1.5 wt% of copper oxide and 8 wt% of fluorine, cutting, edging, slicing, forming a fillet, and edging to obtain a blue glass rough blank with the thickness of 0.175 mm. Then, the double-sided physical polishing process was repeated 3 times under the following conditions:

the pressure value of the first section of polishing work is 0.08Mpa, the speed is 500rpm/min, and the working time is 10 min; the pressure value of the second stage of polishing work is 0.12Mpa, the speed is 1000rpm/min, and the working time is 120 min; the pressure value of the third stage of polishing work is 0.06Mpa, the speed is 500rpm/min, and the working time is 8 min.

The thickness of the formed blue glass was 0.14 mm.

Example 2

The other steps are the same as example 1, except that the working time of the second stage polishing work is prolonged to 150min, and the thickness of the formed blue glass is 0.11 mm.

Example 3

The other steps were the same as in example 1, except that the double-side physical polishing treatment was repeated 3 times under the following conditions:

the pressure value of the first section of polishing work is 0.05Mpa, the speed is 500rpm/min, and the working time is 5 min; the pressure value of the second stage of polishing work is 0.08Mpa, the speed is 800rpm/min, and the working time is 5 min; the pressure value of the third section of polishing work is 0.12Mpa, the speed is 1000rpm/min, and the working time is 140 min; the pressure value of the fourth stage of polishing work is 0.06Mpa, the speed is 500rpm/min, and the working time is 7 min.

The thickness of the formed blue glass was 0.11 mm.

Example 4

the pressure value of the first section of polishing work is 0.03Mpa, the speed is 500rpm/min, and the working time is 5 min; the pressure value of the second stage of polishing work is 0.06Mpa, the speed is 800rpm/min, and the working time is 5 min; the pressure value of the third stage of polishing work is 0.12Mpa, the speed is 1000rpm/min, and the working time is 120 min; the pressure value of the fourth section of polishing work is 0.06Mpa, the speed is 500rpm/min, and the working time is 5 min; the pressure value of the fifth section of polishing work is 0.03Mpa, the speed is 300rpm/min, and the working time is 2 min.

The thickness of the formed blue glass was 0.11 mm.

Comparative example 1

The rest of the procedure was the same as in example 1, except that the following conditions were used for double-side physical polishing:

the pressure value is 0.12Mpa, the rotating speed is 1000rpm/min, and the working time is 150 min.

The above polishing process was then repeated several times until a blue glass having a thickness of 0.11mm was formed.

Comparative example 2

The rest steps are the same as the example 1, except that the alkaline solution with the Ph value of 11.0-13.0 is adopted for polishing:

the polishing solution comprises the following components: 0.5-2% of cubic boron nitride powder with the particle size of 1-6 microns, 14-16% of alkylphenol polyoxyethylene, 4-6% of glycerol, 9-11% of polypropylene glycol 400, 0.5-2% of nano silicon dioxide and the balance of deionized water. Continuously supplementing alkaline solution in the polishing process to maintain the pH value of the polishing solution; the alkaline solution is KOH.

The thickness of the formed blue glass was 0.11 mm.

The blue glasses were prepared by the methods of examples 1 to 4 and comparative examples 1 and 2 described above, 100 sheets of the blue glasses were repeatedly prepared for each example and comparative example, and the surface condition of the blue glasses prepared by the methods of examples 1 to 4 and comparative examples 1 and 2 was observed. Examples 1-4 all ensure that more than 50% of the blue glass in 100 sheets of product is not broken, damaged, and has no visible and noticeable cracks on the surface, wherein the proportion of intact blue glass in example 4 can be as high as 85%. The product yield of the comparative example 1 is about 30 percent, the number of the complete blue glass pieces obtained by the comparative example 2 is slightly higher than that of the comparative example 1, but more than half of the surfaces of 100 blue glass pieces have obvious defects of film marks, watermarks and the like.

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 method of making a blue glass, the method comprising:

cutting the blue glass raw material;

slicing the blue glass raw material subjected to the cutting treatment to obtain a blue glass rough blank;

grinding the blue glass rough blank;

and carrying out double-sided physical polishing treatment on the ground blue glass rough blank, wherein the double-sided physical polishing treatment comprises at least 3 polishing stages: the pressure of the polishing disc to the blue glass rough blank in the pressurization polishing stage is larger than that of the polishing disc to the blue glass rough blank in the initial polishing stage, and the pressure of the polishing disc to the blue glass rough blank in the decompression polishing stage is smaller than that of the polishing disc to the blue glass rough blank in the pressurization polishing stage.

2. The method of claim 1, wherein the pressure of the polishing disk against the blue glass blank in the initial polishing stage is less than 0.1MPa,

the rotating speed of the polishing disk is less than 1000 rpm/min.

3. The method of claim 2, wherein the polishing platen rotates at a higher speed during the pressurized polishing phase than during the initial polishing phase, and wherein the polishing platen rotates at a lower speed during the depressurized polishing phase than during the pressurized polishing phase.

4. The method of claim 3, wherein the double-sided physical polishing process comprises:

a first polishing stage, wherein the pressure range of the polishing disc on the blue glass rough blank in the first polishing stage comprises 0.01-0.04 MPa, and the rotating speed range of the polishing disc comprises 300-600 rpm/min;

a second polishing stage, wherein the pressure range of the polishing disk on the blue glass rough blank in the second polishing stage comprises 0.05-0.09 Mpa, and the rotating speed range of the polishing disk comprises 650-900 rpm/min;

a third polishing stage, wherein the pressure range of the polishing disc on the blue glass rough blank in the third polishing stage comprises 0.1-0.15 Mpa, and the rotating speed range of the polishing disc comprises 950-1200 rpm/min;

a fourth polishing stage, wherein the pressure range of the polishing disc on the blue glass rough blank in the fourth polishing stage comprises 0.05-0.09 Mpa, and the rotating speed range of the polishing disc comprises 300-600 rpm/min;

and in the fifth polishing stage, the pressure range of the polishing disc on the blue glass rough blank in the fifth polishing stage comprises 0.01-0.04 MPa, and the rotating speed of the polishing disc is not more than 300 rpm/min.

5. The method according to any one of claims 1-4, characterized in that the method comprises: repeating the double-sided physical polishing process a plurality of times to reduce the thickness of the blue glass blank by not more than 20 μm in each of the double-sided physical polishing processes.

6. The method of claim 1, further comprising at least one of:

after the cutting process is performed on the blue glass raw material and before the slicing process is performed on the blue glass raw material, the method further comprises the following steps: performing edge grinding treatment on the edge of the blue glass subjected to the cutting treatment;

after the slicing process, before the polishing process, the method further comprises: and cutting the edge of the blue glass rough blank to form a round angle.

7. The method of claim 6, wherein the forming the fillet comprises: and after the blue glass rough blank is fixed, grinding the edge of the blue glass rough blank by using a grinding wheel, wherein the grinding wheel rotates at the speed of 500-600 rpm/min.

8. The method according to claim 1, wherein the slicing process comprises a diamond wire cutting process, the diameter of the diamond wire cutting process is 0.14-0.16 mm, the grain size of the diamond on the diamond wire is 30-40 μm, the speed and motion range of the diamond wire during cutting is 12-15 m/s, the moving speed range of the blue glass raw material relative to the diamond wire is controlled to be 0.2-0.3 mm/min, and a cutting fluid is sprayed on the diamond wire during cutting, wherein the cutting fluid comprises diamond grains with the grain size of 20-30 μm and corundum grains with the grain size of 50-60 μm.

9. The method according to claim 1, wherein the rotation speed of the grinding disc during the grinding process is in a range of 1000-1200 rpm/min, and the grinding fluid for the grinding process comprises: alumina particles with the particle size of 3-6 mu m, 0.5-2 wt% of cubic boron nitride powder with the particle size of 10-20 mu m, 14-16 wt% of alkylphenol polyoxyethylene, 4-6 wt% of glycerol, 9-11 wt% of polypropylene glycol 400 and the balance of water;

the grinding treatment is further followed by: and (5) adopting absolute ethyl alcohol to carry out cleaning treatment.

10. 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, and wherein the blue glass has a thickness of less than 0.15 mm.

11. A blue glass, characterized in that it is produced by the method according to any one of claims 1 to 10.

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 the camera assembly 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 infrared cut-off filter is arranged at a position which enables the light emitted by the light emitting side of the camera assembly to pass through the infrared cut-off filter and then be received by the image sensor.

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.