Camera coating method and camera

Abstract

The application relates to the technical field of cameras, in particular to a camera coating method and a camera. The coating method comprises the following steps: designing a film system structure of a back AR film of the camera, coating the back AR film on the back of the camera through a coating machine; determining a front AR film of the camera as a color film, performing color design on the front AR film of the camera, and determining a color card target; designing a film system structure of the front AR film of the camera according to the color card target, obtaining a film system structure of a standard color of the color card target; manufacturing a color range according to the standard color, obtaining a film system structure range meeting the color range; and coating the front AR film and an AF film on the front of the camera through the coating machine. The film system structure obtained through the camera coating method has very small differences between Lab value data of the color and the color card target, the color can also reach the color card effect through debugging, the electroplating does not fall off in the water boiling hundred grid test, the total film thickness of the front and back of the camera is relatively thin, and the reliability is also not problematic.

Description

Technical Field

[0001] This invention relates to the field of camera technology, specifically to a camera coating method and a camera. Background Technology

[0002] With the arrival of the 5G era and the widespread adoption of smartphones, watches, and other electronic products, consumers' demands for electronic products are no longer limited to performance and lifespan; they also have increasingly higher requirements for visual effects and appearance. Currently, cool-looking phone back covers have become one of the design directions pursued by most consumer electronics manufacturers for their mid-to-high-end models. The cool appearance is mainly reflected in the wide variety of colors available for phone back covers. However, the colors presented by traditional AR films (anti-reflective films) coated on cameras are generally close to colorless or pale blue or pale green. Not only are the colors monotonous, but they also do not match the diverse colors of phone back covers, easily causing visual fatigue for consumers. Therefore, developing unconventional AR film preparation methods for cameras that match the colors of phone back covers is of great research significance. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a camera coating method and a camera.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a camera coating method, comprising the following steps:

[0005] Step 1: Design the film structure of the AR film on the back of the camera, and deposit the AR film on the back of the camera using a coating machine;

[0006] Step 2: Define the front AR film of the camera as a color film, design the color of the front AR film of the camera, determine the color target, and the reflectivity of the color target is no more than 3%.

[0007] Step 3: Design the film structure of the front AR film of the camera according to the color swatch target to obtain the film structure of the standard color of the color swatch target;

[0008] Step 4: Create a color range based on the standard colors to obtain the film structure range that meets the color range;

[0009] Step 5: Apply a front AR film and an AF film to the front of the camera using a coating machine.

[0010] Furthermore, the color of the front AR film includes any single color selected from red, orange, yellow, green, cyan, blue, and purple.

[0011] Furthermore, in step 1, the film structure and thickness of the AR film on the back of the camera are as follows:

[0012] Which floor? one two three Four five Total film thickness Membrane materials <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> Film thickness(nm) 14.2 15 29.8 131 85 275 .

[0013] Furthermore, in step 2, the color of the front of the camera is designed to be yellow, and the Lab values ​​of the color swatch are: L value is 14.67, a value is -2.7, and b value is 5.99.

[0014] Furthermore, based on the yellow color chart target, the film structure of the front AR film of the camera was designed. The film structure and film thickness results for the standard color of the yellow color chart target are as follows:

[0015] Which floor? one two three Four five six Total film thickness Membrane materials <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> Film thickness(nm) 9.86 42.78 24.81 33.84 24.31 80.53 216 .

[0016] Furthermore, based on the yellow color range, several gradient membrane structure designs were created, specifically as follows:

[0017] A total of nine-order membrane structure designs were developed, with the third to eighth orders meeting the requirements. The yellow Lab values ​​range as follows: L value range is 14.57 to 14.8, ΔL is 0.23, a value range is -3.8 to -0.2, Δa is 3.6, b value range is 3.02 to 8.31, and Δb is 5.29.

[0018] The total film thickness of the six layers ranges from 208.93 to 220.94 mm. The thickness of the first Ti3O5 layer ranges from 9.53 to 10.08 mm, the thickness of the second SiO2 layer ranges from 41.36 to 43.73 mm, the thickness of the third Ti3O5 layer ranges from 23.98 to 25.36 mm, the thickness of the fourth SiO2 layer ranges from 32.72 to 34.6 mm, the thickness of the fifth Ti3O5 layer ranges from 23.5 to 24.85 mm, and the thickness of the sixth SiO2 layer ranges from 77.84 to 82.32 mm.

[0019] Furthermore, in step 2, the color of the front of the camera is designed to be light green, and the Lab values ​​of the color swatch are: L value is 7.12, a value is -10.2, and b value is -1.7.

[0020] Furthermore, based on the light green color palette target, the film structure of the front AR film of the camera was designed. The film structure and film thickness results for the standard color of the light green color palette target are as follows:

[0021] Which floor? one two three Four five six Total film thickness Membrane materials <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> Film thickness(nm) 8.77 36.43 22.05 34.88 19.21 96.38 217.72 .

[0022] Furthermore, based on the light green color range, several gradient membrane structure designs were created, specifically as follows:

[0023] A total of seven-stage membrane structure design was adopted. The third to sixth stages meet the requirements. The light green Lab value range is as follows: L value range is 7.12 to 8.62, ΔL is 1.5, a value range is -13.4 to -10.2, Δa is 3.2, b value range is -1.7 to 4.62, Δb is 6.32.

[0024] The total thickness of the four layers ranges from 217.72 to 225.89 μm. The thickness of the first Ti3O5 layer ranges from 8.77 to 9.1 μm, the thickness of the second SiO2 layer ranges from 36.43 to 37.8 μm, the thickness of the third Ti3O5 layer ranges from 22.05 to 22.88 μm, the thickness of the fourth SiO2 layer ranges from 34.88 to 36.19 μm, the thickness of the fifth Ti3O5 layer ranges from 19.21 to 19.93 μm, and the thickness of the sixth SiO2 layer ranges from 96.38 to 99.99 μm.

[0025] The present invention also provides a camera, which is obtained by the above-described camera coating method.

[0026] Furthermore, the average transmittance of the rear AR film and the front AR film of the camera is greater than 95% for light with wavelengths in the range of 400 to 700 nm.

[0027] As can be seen from the above description of the present invention, compared with the prior art, the present invention has at least one of the following beneficial effects:

[0028] 1. By using the camera coating method of the present invention to coat the front and back of the camera with AR film, the colors of the camera are enriched to match the colorful back cover, so that the contrast between the camera and the main body of the back cover is small and the overall appearance is more beautiful.

[0029] 2. The film structure obtained by the camera coating method of the present invention has a very small difference between the Lab value data of the color and the target color chart. The color can also achieve the effect of the color chart after adjustment. Moreover, the electroplating does not fall off in the water boiling cross test, and the overall reliability is not a problem. At the same time, the total film thickness on the front and back of the camera is thinner and the film formation time is shorter, which helps to save energy and improve the appearance yield.

[0030] 3. The camera of the present invention satisfies both the frontal color requirement and the overall visible light transmittance requirement, and has good performance. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating the steps of a camera coating method according to Embodiment 1 of the present invention;

[0032] Figure 2 This is a transmittance curve of the back AR film in Embodiment 1 of the present invention;

[0033] Figure 3This is a graph showing the reflection curve and Lab value parameters of the yellow color plate target in Embodiment 1 of the present invention;

[0034] Figure 4 This is a graph showing the reflection curve and Lab value parameters of the light green color plate target in Embodiment 2 of the present invention. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Specific Implementation Example 1:

[0038] Reference Figure 1 As shown, a camera coating method includes the following steps:

[0039] Step 1: Design the film structure of the AR film on the back of the camera, and deposit the AR film on the back of the camera using a coating machine;

[0040] Step 2: Define the front AR film of the camera as a color film, design the color of the front AR film of the camera, determine the color target, and the reflectivity of the color target is no more than 3%.

[0041] Step 3: Design the film structure of the front AR film of the camera according to the color swatch target to obtain the film structure of the standard color of the color swatch target;

[0042] Step 4: Create a color range based on the standard colors to obtain the film structure range that meets the color range;

[0043] Step 5: Apply a front AR film and an AF film to the front of the camera using a coating machine.

[0044] The camera coating method of this invention coats AR films on both sides of the camera, enriching the camera's colors to match the vibrant colors of the back cover, resulting in a smaller color contrast between the camera and the main body of the back cover, making the overall appearance more aesthetically pleasing. The film structure obtained by the camera coating method of this invention has a very small difference between the Lab value data of the color and the target color chart. The color can also achieve the effect of the color chart through adjustment, and the electroplating does not peel off in the water boiling cross-cut test, and the overall reliability is not a problem. At the same time, the total film thickness on both sides of the camera is relatively thin, and the film formation time is short, which helps to save energy and improve the appearance yield.

[0045] As a preferred embodiment of the present invention, it may also have the following additional technical features:

[0046] In this embodiment, in step 1, the TFC film system design software is used to design the back AR film. Taking 420-680nm and transmittance >94% as an example, the coating materials are high-refractive-index titanium pentoxide and low-refractive-index silicon dioxide. The film system structure and film thickness of the back AR film of the camera are as follows:

[0047] Table 1

[0048] Which floor? one two three Four five Total film thickness Membrane materials <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> Film thickness(nm) 14.2 15 29.8 131 85 275

[0049] The corresponding transmission curve is as follows Figure 2 The actual wavelength is 420–680 nm, and the transmittance is 94.6%.

[0050] Specifically, the AR film on the back is deposited using a Cathay 1550 vacuum evaporation coating machine. First, a clean substrate (camera glass) is attached to the front side with a high-temperature film, while the back side is exposed and placed on the machine's umbrella. The chamber door is closed and a vacuum is drawn. When the vacuum reaches the set 3.0E-3Pa, film formation begins. The layer in direct contact with the substrate is the first layer in the design, namely silicon dioxide, with a thickness of 14.2nm and a film formation rate of 0.5nm / s. Next, the second layer, namely titanium pentoxide, with a thickness of 15nm and a film formation rate of 0.25nm / s, is deposited. This process is repeated until the third, fourth, and fifth layers are deposited, thus completing the back coating.

[0051] In this embodiment, in step 2, the color of the front of the camera is designed to be yellow, and the Lab values ​​of the target on the color chart are: L value 14.67, a value -2.7, and b value 5.99. Based on the yellow target on the color chart, an Olympus reflectance tester is used to detect the reflectance curve of the target and its Lab value as follows. Figure 3 .

[0052] In this embodiment, the film structure of the front AR film of the camera is designed based on the yellow color target. The film structure and film thickness results of the standard color of the yellow color target are as follows:

[0053] Table 2

[0054] Which floor? one two three Four five six Total film thickness Membrane materials <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> Film thickness(nm) 9.86 42.78 24.81 33.84 24.31 80.53 216

[0055] Based on the yellow color swatch, the design was imported into TFC software, resulting in a six-layer film system: Ti3O5 / SiO2 / Ti3O5 / SiO2 / Ti3O5 / SiO2, alternating high and low refractive index materials. The film thicknesses are as follows: the first layer is a high-refractive-index material, titanium pentoxide, at 9.86 nm; the second layer is a low-refractive-index material, silicon dioxide, at 42.78 nm; the third layer is a high-refractive-index material, titanium pentoxide, at 24.81 nm; the fourth layer is a low-refractive-index material, silicon dioxide, at 33.84 nm; the fifth layer is a high-refractive-index material, titanium pentoxide, at 24.31 nm; and the sixth layer is a low-refractive-index material, silicon dioxide, at 80.53 nm. It is worth noting that this front-facing AR film is unconventional. Although it has color, it differs from the color film on the phone's back cover. The difference lies in its low reflectivity, less than 3%, designed to ensure overall transmittance without compromising color accuracy. In addition, its total film thickness is 216nm, which is smaller than the AR film on the back. The thinner the film, the shorter the film formation time, which helps to save energy and improve the appearance yield.

[0056] The process of forming the front AR film is roughly the same as that of coating the back AR film, except that an additional AF film is applied at the end. The AF film is an anti-fingerprint protective film, which is used to prevent the camera from getting dirty and scratched after it is installed.

[0057] In this embodiment, a membrane structure design with several gradients is created based on the yellow color range, specifically as follows:

[0058] Table 3

[0059]

[0060]

[0061] A total of nine-order membrane structure designs were developed, with the third to eighth orders meeting the requirements. The yellow Lab values ​​range as follows: L value range is 14.57 to 14.8, ΔL is 0.23, a value range is -3.8 to -0.2, Δa is 3.6, b value range is 3.02 to 8.31, and Δb is 5.29.

[0062] The total film thickness of the six layers ranges from 208.93 to 220.94 mm. The thickness of the first Ti3O5 layer ranges from 9.53 to 10.08 mm, the thickness of the second SiO2 layer ranges from 41.36 to 43.73 mm, the thickness of the third Ti3O5 layer ranges from 23.98 to 25.36 mm, the thickness of the fourth SiO2 layer ranges from 32.72 to 34.6 mm, the thickness of the fifth Ti3O5 layer ranges from 23.5 to 24.85 mm, and the thickness of the sixth SiO2 layer ranges from 77.84 to 82.32 mm.

[0063] Considering the front AR film is a yellow color film, a single standard color is insufficient for industrial mass production. Therefore, a color range, commonly referred to in the industry as a gradient, needs to be created based on the standard color. Gradient creation is achieved by left-right shifting of the spectrum, represented by data showing changes in each film layer, film thickness, and a visual representation of the Lab values. A total of nine gradients were created, with six yielding satisfactory results. The total film thickness range for these six gradients is 208.93–220.94 nm, with a thickness difference of 12 nm, accounting for 5.45%. Using a wavelength of 550 nm as a reference, this translates to a wavelength range of approximately 29 nm, fully sufficient for mass production. The Lab value range for the satisfactory gradient is as follows: L value range: 14.57–14.8, ΔL: 0.23; a value range: -3.8–-0.2, Δa: 3.6; b value range: 3.02–8.31, Δb: 5.29. From the Lab data, it can be seen that, except for a relatively narrow L value range, the ab value range is relatively wide, sufficient for mass production.

[0064] After the gradient was approved, the color was adjusted to meet the target of the color chart, and it passed the routine reliability tests, including dry cross-cut adhesion testing and boiling cross-cut adhesion testing, without the electroplating layer peeling off. The overall reliability was also satisfactory. Specific data are shown in the table below:

[0065] Table 4

[0066]

[0067] Therefore, the yellow camera coating layer on the front of Example 1 meets the reliability requirements.

[0068] The camera coating method of this invention is applicable to the manufacture of AR films for the front of cameras that require any single color from red, orange, yellow, green, cyan, blue, and purple. The following Example 2 will further elaborate on this using a light green color as an example. Specific Implementation Example 2:

[0070] In this embodiment, in step 2, the color of the front of the camera is designed to be light green, and the Lab values ​​of the color swatch are: L value 7.12, a value -10.2, and b value -1.7. Based on the light green color swatch, an Olympus reflectance meter is used to measure the reflectance curve of the target and its Lab value as follows. Figure 4 :

[0071] In this embodiment, the film structure of the front AR film of the camera is designed based on the light green color target. The film structure and film thickness results of the standard color of the light green color target are as follows:

[0072] Table 5

[0073] Which floor? one two three Four five six Total film thickness Membrane materials <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> <![CDATA[Ti3O5]]> <![CDATA[SiO2]]> Film thickness(nm) 8.77 36.43 22.05 34.88 19.21 96.38 217.72

[0074] Based on the color chart target, the design was imported into TFC software, resulting in a six-layer film system: Ti3O5 / SiO2 / Ti3O5 / SiO2 / Ti3O5 / SiO2, with alternating high and low refractive index materials. The film thicknesses are as follows: first layer, high refractive index material titanium pentoxide, 8.77 nm; second layer, low refractive index material silicon dioxide, 36.43 nm; third layer, high refractive index material titanium pentoxide, 22.05 nm; fourth layer, low refractive index material silicon dioxide, 34.88 nm; fifth layer, high refractive index material titanium pentoxide, 19.21 nm; sixth layer, low refractive index material silicon dioxide, 96.38 nm. The specific data is shown in the table below. It is worth noting that this front-side non-conventional AR has the same low reflectivity as the yellow front-side of Example 1, which is less than 3% and about 1.5%. The purpose is to ensure that the overall transmittance is not affected while maintaining the color. In addition, its total film thickness is 217.72nm, which is the same as that of Example 1 and is smaller than the back-side AR film. The thinner the film thickness, the shorter the film formation time, which helps to save energy and improve the appearance yield.

[0075] In this embodiment, a membrane structure design with several gradients is created based on the light green color range, specifically as follows:

[0076] Table 6

[0077]

[0078]

[0079] A total of seven-stage membrane structure design was adopted. The third to sixth stages meet the requirements. The light green Lab value range is as follows: L value range is 7.12 to 8.62, ΔL is 1.5, a value range is -13.4 to -10.2, Δa is 3.2, b value range is -1.7 to 4.62, Δb is 6.32.

[0080] The total thickness of the four layers ranges from 217.72 to 225.89 μm. The thickness of the first Ti3O5 layer ranges from 8.77 to 9.1 μm, the thickness of the second SiO2 layer ranges from 36.43 to 37.8 μm, the thickness of the third Ti3O5 layer ranges from 22.05 to 22.88 μm, the thickness of the fourth SiO2 layer ranges from 34.88 to 36.19 μm, the thickness of the fifth Ti3O5 layer ranges from 19.21 to 19.93 μm, and the thickness of the sixth SiO2 layer ranges from 96.38 to 99.99 μm.

[0081] The front AR film is a light green color film, so a single standard color cannot meet the requirements for mass production. It is necessary to create a color range based on the standard color, i.e., to create a gradient. The gradient is created by shifting the spectrum left and right, and is represented by data as a visual representation of the changes in each film layer, film thickness, and Lab value. Specific data is shown in the table below. Because green is the color most sensitive to the human eye, even a slight change in its color is visually noticeable. Therefore, a total of 7 gradients were created, with the customer accepting 4. The total film thickness range for the four gradients is 217.72–225.89 nm, with a thickness difference of approximately 8 nm, accounting for 3.6%. Using a wavelength of 550 nm as a reference, this translates to a wavelength range of approximately 19.8 nm, which is sufficient for mass production. The acceptable gradient Lab value range is as follows: L value range is 7.12 to 8.62, ΔL is 1.5, a value range is -13.4 to -10.2, Δa is 3.2, b value range is -1.7 to 4.62, Δb is 6.32. From the Lab data, it can be seen that the L value range is 1.5 and the ab value range is relatively wide, which can meet the requirements of mass production.

[0082] After the gradient was approved, the color was adjusted to meet the target of the color chart, and it passed the routine reliability tests, including dry cross-cut adhesion testing and boiling cross-cut adhesion testing, without the electroplating layer peeling off. The overall reliability was also satisfactory. Specific data are shown in the table below:

[0083] Table 7

[0084]

[0085]

[0086] Therefore, the light green camera coating layer on the front of Example 2 meets the reliability requirements.

[0087] The present invention also provides a camera, which is obtained using the above-described camera coating method. The average transmittance of the rear AR film and the front AR film of the camera for light in the wavelength range of 400-700nm is greater than 95% on both sides.

[0088] The camera of this invention satisfies both the frontal color requirement and the overall visible light transmittance requirement, thus exhibiting good performance.

[0089] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0090] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A camera coating method, characterized in that, The method comprises the following steps: Step 1: designing the film system structure of the back AR film of the camera, and coating the back AR film on the back of the camera by a coating machine; Step 2: determining the color film of the front AR film of the camera, and designing the color of the front AR film of the camera to determine the color plate target, wherein the reflectivity of the color plate target is not greater than 3%; Step 3: designing the film system structure of the front AR film of the camera according to the color plate target to obtain the film system structure of the standard color of the color plate target; Step 4: manufacturing the color range according to the standard color to obtain the film system structure range meeting the color range; Step 5: coating the front AR film and the AF film on the front of the camera by the coating machine; In step 2, when the color of the front of the camera is designed as yellow, the Lab values of the color plate target are respectively: the L value is 14.67, the a value is -2.7, and the b value is 5.99; the film system structure and the film thickness of the standard color of the yellow color plate target are designed according to the color plate target of the yellow color, and the results are as follows: ， Or; In step 2, when the color of the front of the camera is designed as light green, the Lab values of the color plate target are respectively: the L value is 7.12, the a value is -10.2, and the b value is -1.7; the film system structure of the front AR film of the camera is designed according to the color plate target of the light green color, and the film system structure and the film thickness of the standard color of the light green color plate target are as follows: 。 2. The camera coating method of claim 1, wherein, In step 1, the film system structure and the film thickness of the back AR film of the camera are as follows: 。 3. A camera, characterized by The camera is obtained by the coating method of any one of claims 1-2.

4. The camera of claim 3, wherein, The double-side average transmittance of the back AR film and the front AR film of the camera to light with a wavelength in the range of 400-700 nm is greater than 95%.

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