Manufacturing process of ultrathin high-definition camera lens

Abstract

The invention discloses a manufacturing process of an ultrathin high-definition camera lens. The manufacturing process of the ultrathin high-definition camera lens comprises the steps of S1, material selection and pretreatment, S2, precise compression molding, S3, a chemical thinning process, S4, plasma-assisted polishing, S5, low-temperature ion plating and S6, detection and quality control. According to the manufacturing process of the ultrathin high-definition camera lens, mechanical thinning is replaced by chemical etching, chemical thinning is more suitable for uniform control of the ultrathin lens, the problems of microcracks and uneven thickness occurring in mechanical thinning are avoided, high-precision control of thinning is achieved through real-time laser thickness detection, the thickness uniformity is obviously improved, and the production efficiency is improved. Compared with a traditional process that a large amount of polishing is needed after mechanical thinning, the surface smoothness basically meets the requirement after chemical thinning, the polishing step is reduced, and time and cost are effectively saved.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-thin lens manufacturing technology, and in particular to an ultra-thin high-definition camera lens manufacturing technology. Background Art

[0002] Ultra-thin high-definition camera lenses are optical lenses used in camera equipment. They have ultra-thin design, high light transmittance, low distortion and high resolution. They are widely used in miniaturized imaging devices such as smartphones, tablets, drones, and surveillance cameras. Their ultra-thin characteristics make the equipment thinner and more compact, while their high-definition performance improves the imaging quality, ensuring that the picture is clear and realistic. The manufacture of ultra-thin high-definition camera lenses involves a series of precise process flows, mainly including: material preparation, thinning, precision polishing, ion beam correction, coating, anti-scratch treatment, and testing and packaging. This type of processing technology enables ultra-thin high-definition camera lenses to have ultra-thin, high light transmittance and high-definition imaging characteristics, meeting the needs of various high-end camera equipment.

[0003] In traditional ultra-thin lens processing, mechanical thinning is usually used for thinning. Mechanical thinning generally includes rough grinding, semi-fine grinding, fine grinding, precision polishing and post-processing. Traditional mechanical thinning has low production costs, simple equipment and a wide range of applications. It is suitable for large-scale, multi-material lens processing. However, the precision of mechanical thinning is insufficient, and it is difficult to achieve uniform thickness control below the micron level. In addition, the surface roughness of the processed lens is high, which easily leaves tiny scratches on the lens surface and reduces the yield. At the same time, mechanical thinning may also generate stress on the lens surface and affect the optical performance. Summary of the invention

[0004] Based on this, it is necessary to provide an ultra-thin high-definition camera lens manufacturing process to address the technical problems of insufficient precision, high roughness, and easy impact on optical performance in mechanical thinning in the existing ultra-thin lens processing technology.

[0005] A manufacturing process for an ultra-thin high-definition camera lens comprises the following steps: S1. material selection and pretreatment, S2. precision compression molding, S3. chemical thinning process, S4. plasma-assisted polishing, S5. low-temperature ion plating and S6. detection and quality control.

[0006] The above-mentioned step S3 specifically includes the following steps: using ultrasonic cleaning to remove stains, oxides and other residues on the lens to ensure the uniformity of subsequent chemical corrosion; using nitrogen blowing to dry the lens to avoid residual moisture affecting the corrosion effect; according to the processing requirements of the actual product, using the anti-corrosion material to locally mask the preset position of the lens; using a mixture of hydrofluoric acid and nitric acid to perform short-term and multiple corrosion thinning on the lens under preset temperature conditions; each corrosion thinning treatment is between 20-30s, and after each thinning, the thickness of the corresponding part of the lens is measured until the target thickness is reached and the corrosion thinning treatment is stopped; after the corrosion thinning treatment is completed, the residual corrosive liquid on the surface of the lens is fully cleaned with deionized water to ensure that the corrosion of the lens surface is stopped; after cleaning, the lens is fully dried by nitrogen blowing; after the lens is dried, the thickness of the lens after thinning is detected, and the surface roughness of the lens is detected to ensure that the lens meets the optical requirements.

[0007] The hydrofluoric acid and nitric acid mixture in step S3 contains 1-5% hydrofluoric acid and 3-20% nitric acid.

[0008] The hydrofluoric acid and nitric acid mixture in step S3 contains 5% hydrofluoric acid and 3% nitric acid.

[0009] The etching and thinning temperature in the above step S3 is set to 20-30° C. Too high a temperature may cause uneven etching on the lens surface.

[0010] In the above step S3, the lens thickness is detected by using a non-contact laser thickness measuring instrument to detect the thickness in real time to control the uniformity during the thinning process.

[0011] In the above step S3, when the etching thinning process is carried out, the etching liquid needs to be slowly stirred to maintain uniform flow.

[0012] The stirring speed is 50-100 rpm.

[0013] In the above step S3, when the lens is cleaned after the etching and thinning process is completed, an alkaline solution may be used to rinse the surface of the lens to neutralize the acidic residue.

[0014] The above-mentioned step S1 includes the following steps: selecting optical glass with high refractive index and low dispersion; material pretreatment: cutting the glass substrate into a blank shape and cleaning it to remove surface impurities; using pure water ultrasonic cleaning for 5 minutes at a temperature of 30°C to ensure a clean surface entering the molding process.

[0015] In the above step S1, the lens material is selected from one of LaF series glass, N-BK7 and high refractive index plastic polymer.

[0016] The above-mentioned step S2 includes the following steps: using a high-hardness tungsten steel mold, whose surface is processed by ultra-precision CNC machining and diamond tool finishing to obtain submicron smoothness; the mold temperature during the compression molding process is controlled at 550-600°C to ensure that the lens material is molded under appropriate fluidity. Too low a temperature may lead to incomplete molding, and too high a temperature will produce internal stress; the compression molding uses a vertical pressurization method, the pressure is in the range of 100-300MPa, and is applied for 15 seconds; after molding, the lens blank needs to be cooled to room temperature at a slow cooling rate to reduce stress, and then demolded at 30°C to obtain a lens blank.

[0017] In the above step S2, the surface roughness of the mold is ≤10 nm.

[0018] In the above step S2, the cooling rate of the lens blank is 0.5-1°C / s.

[0019] The above-mentioned step S4 includes the following steps: using low-temperature plasma equipment to polish the surface of the lens in a vacuum chamber, and the polishing time is controlled within 5-10 minutes; plasma removes tiny surface protrusions to make the surface roughness reach less than 5 nm; the working pressure of the plasma is set at 50-100Pa, and the power is controlled at 80-120W.

[0020] In the above step S4, Ar plasma is used as the low temperature plasma.

[0021] The above-mentioned step S5 includes the following steps: using low-temperature ion evaporation method to coat a multi-layer anti-reflection film; the thickness of each film layer is 100-150nm; the coating temperature is controlled at 50-100°C to avoid high temperature causing deformation or stress to the lens to meet the high transmittance requirements of the ultra-thin lens; and a hydrophobic layer is coated on the outside of the anti-reflection film with a film thickness of 10-20 nm to enhance the anti-fouling and waterproof capabilities.

[0022] In the above step S5, the multi-layer anti-reflection film is made of one of silicon dioxide and titanium oxide.

[0023] In the above step S5, the hydrophobic layer is made of fluoride materials.

[0024] The above-mentioned step S6 includes the following steps: using a laser thickness gauge to control the thickness tolerance within ±0.5µm; using an optical surface detector to inspect the surface defects (such as scratches and bubbles) of the lens; testing the transmittance and reflectivity of the lens to ensure that the transmittance is ≥95% and the reflectivity is ≤0.5%.

[0025] The above-mentioned ultra-thin high-definition camera lens manufacturing process replaces mechanical thinning with chemical etching. Chemical thinning is more suitable for uniform control of ultra-thin lenses, avoiding microcracks and uneven thickness problems that occur during mechanical thinning. This process achieves high-precision control of thinning through real-time laser thickness detection, and significantly improves thickness uniformity. Compared with the traditional process that requires a lot of polishing after mechanical thinning, the surface finish after chemical thinning has basically met the requirements, reducing the polishing steps and effectively saving time and cost. Based on this, the ultra-thin high-definition camera lens manufacturing process is more adaptable to the needs of ultra-thin lenses than traditional manufacturing methods through improvements in material selection, precision molding, chemical thinning, plasma-assisted polishing, low-temperature ion plating and intelligent detection methods. Especially in terms of thickness uniformity, surface finish, optical performance and durability, the lens quality is improved and the production cost and finished product loss rate are reduced. It is an effective manufacturing method for high-quality, ultra-thin camera lens lenses. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0027] The present invention discloses a manufacturing process for an ultra-thin high-definition camera lens, which comprises the following steps: S1. material selection and pretreatment, S2. precision compression molding, S3. chemical thinning process, S4. plasma-assisted polishing, S5. low-temperature ion plating and S6. detection and quality control. Specifically, the above-mentioned step S3 specifically includes the following steps: using ultrasonic cleaning to remove stains, oxides and other residues on the lens to ensure the uniformity of subsequent chemical corrosion; using nitrogen blowing to dry the lens to avoid residual moisture affecting the corrosion effect; according to the processing requirements of the actual product, using the anti-corrosion material to locally mask the preset position of the lens; using a mixture of hydrofluoric acid and nitric acid to perform short-term and multiple corrosion thinning on the lens under preset temperature conditions; each corrosion thinning treatment is between 20-30s, and after each thinning, the thickness of the corresponding part of the lens is measured until the target thickness is reached and the corrosion thinning treatment is stopped; after the corrosion thinning treatment is completed, the residual corrosive liquid on the surface of the lens is fully cleaned with deionized water to ensure that the corrosion of the lens surface is stopped; after cleaning, the lens is fully dried by nitrogen blowing; after the lens is dried, the thickness of the lens after thinning is detected, and the surface roughness of the lens is detected to ensure that the lens meets the optical requirements. The above-mentioned ultra-thin high-definition camera lens manufacturing process uses chemical etching instead of mechanical thinning to uniformly control the thinning process of the lens, avoiding microcracks and uneven thickness problems that occur during mechanical thinning. This process uses real-time laser thickness detection to achieve high-precision control of thinning and significantly improves thickness uniformity. Compared with the traditional process that requires a lot of polishing after mechanical thinning, the surface finish after chemical thinning has basically met the requirements, reducing the polishing steps and effectively saving time and cost.

[0028] Specifically, the hydrofluoric acid and nitric acid mixture in step S3 contains 1-5% hydrofluoric acid and 3-20% nitric acid. In one embodiment, the hydrofluoric acid and nitric acid mixture in step S3 contains 5% hydrofluoric acid and 3% nitric acid.

[0029] Specifically, the etching and thinning temperature in the above step S3 is set to 20-30° C. Too high a temperature may cause uneven etching of the lens surface.

[0030] Specifically, in the above step S3, the lens thickness is detected by using a non-contact laser thickness measuring instrument to detect the thickness in real time to control the uniformity during the thinning process.

[0031] Specifically, in the above step S3, when the etching thinning process is carried out, the etching liquid needs to be stirred slowly to maintain uniform flow. In one embodiment, the stirring speed is 50-100 rpm.

[0032] Specifically, in the above step S3, when the lens is cleaned after the etching and thinning process is completed, an alkaline solution may be used to rinse the surface of the lens to neutralize the acidic residue.

[0033] Furthermore, the above-mentioned step S1 includes the following steps: selecting optical glass with high refractive index and low dispersion; material pretreatment: cutting the glass substrate into a blank shape and cleaning it to remove surface impurities; using pure water ultrasonic cleaning for 5 minutes at a temperature of 30°C to ensure a clean surface entering the molding process.

[0034] Specifically, in the above step S1, the lens material is selected from one of LaF series glass, N-BK7 and high refractive index plastic polymer.

[0035] Furthermore, the above-mentioned step S2 includes the following steps: using a high-hardness tungsten steel mold, whose surface is processed by ultra-precision CNC machining and diamond tool finishing to obtain submicron smoothness; the mold temperature during the compression molding process is controlled at 550-600°C to ensure that the lens material is molded under appropriate fluidity. Too low a temperature may lead to incomplete molding, and too high a temperature may generate internal stress; the compression molding uses a vertical pressurization method, and the pressure is in the range of 100-300MPa, which is continuously applied for 15 seconds; after molding, the lens blank needs to be cooled to room temperature at a slow cooling rate to reduce stress, and then demolded at 30°C to obtain a lens blank.

[0036] Specifically, in the above step S2, the surface roughness of the mold is ≤10 nm.

[0037] Specifically, in the above step S2, the cooling rate of the lens blank is 0.5-1°C / s.

[0038] Furthermore, the above-mentioned step S4 includes the following steps: using low-temperature plasma equipment to polish the lens surface in a vacuum chamber, and the polishing time is controlled within 5-10 minutes; plasma removes tiny surface protrusions to make the surface roughness reach less than 5 nm; the working pressure of the plasma is set at 50-100Pa, and the power is controlled at 80-120W.

[0039] Specifically, in the above step S4, the low temperature plasma is Ar plasma.

[0040] Furthermore, the above-mentioned step S5 includes the following steps: using low-temperature ion evaporation method to coat a multilayer anti-reflection film; the thickness of each film layer is 100-150nm; the coating temperature is controlled at 50-100°C to avoid high temperature causing deformation or stress to the lens to meet the high transmittance requirements of the ultra-thin lens; and a hydrophobic layer is coated on the outside of the anti-reflection film with a film thickness of 10-20 nm to enhance the anti-fouling and waterproof capabilities.

[0041] Specifically, in the above step S5, the multilayer antireflection film is made of one of silicon dioxide and titanium oxide.

[0042] Specifically, in the above step S5, the hydrophobic layer is made of fluoride materials.

[0043] Furthermore, the above step S6 includes the following steps: using a laser thickness gauge to control the thickness tolerance within ±0.5µm; using an optical surface detector to inspect the surface defects (such as scratches and bubbles) of the lens; testing the transmittance and reflectivity of the lens to ensure that the transmittance is ≥95% and the reflectivity is ≤0.5%.

[0044] In summary, the ultra-thin high-definition camera lens manufacturing process disclosed by the present invention replaces mechanical thinning with chemical etching, and chemical thinning is more suitable for uniform control of ultra-thin lenses, avoiding microcracks and uneven thickness problems that occur during mechanical thinning. This process achieves high-precision control of thinning through real-time laser thickness detection, and significantly improves thickness uniformity. Compared with the traditional process that requires a lot of polishing after mechanical thinning, the surface finish after chemical thinning has basically met the requirements, reducing the polishing steps and effectively saving time and cost. Based on this, the ultra-thin high-definition camera lens manufacturing process is more adaptable to the needs of ultra-thin lenses than traditional manufacturing methods through improvements in material selection, precision molding, chemical thinning, plasma-assisted polishing, low-temperature ion plating and intelligent detection methods. Especially in terms of thickness uniformity, surface finish, optical performance and durability, the lens quality is improved and the production cost and finished product loss rate are reduced. It is an effective manufacturing method for high-quality, ultra-thin camera lens lenses.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A manufacturing process for ultra-thin high-definition camera lenses, characterized in that: The process includes the following steps: S1. material selection and pretreatment, S2. precision compression molding, S3. chemical thinning process, S4. plasma assisted polishing, S5. low temperature ion plating, and S6. testing and quality control; The step S3 specifically includes the following steps: using ultrasonic cleaning to remove stains, oxides and other residues on the lens to ensure the uniformity of subsequent chemical corrosion; using nitrogen blowing to dry the lens to avoid residual moisture affecting the corrosion effect; using a resist material to locally mask the preset position of the lens according to the processing requirements of the actual product; using a mixture of hydrofluoric acid and nitric acid to perform short-term and multiple corrosion thinning on the lens under preset temperature conditions; each corrosion thinning treatment is between 20-30s, and after each thinning, the thickness of the corresponding part of the lens is measured until the target thickness is reached and the corrosion thinning treatment is stopped; after the corrosion thinning treatment is completed, the residual corrosive liquid on the surface of the lens is fully cleaned with deionized water to ensure that the corrosion of the lens surface is stopped; after cleaning, the lens is fully dried by nitrogen blowing; after the lens is dried, the thickness of the lens after thinning is detected, and the surface roughness of the lens is detected to ensure that the lens meets the optical requirements.

2. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: The etching and thinning temperature in step S3 is set to 20-30° C. Too high a temperature may cause uneven etching on the lens surface.

3. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: In the step S3, the lens thickness is detected by using a non-contact laser thickness measuring instrument to detect the thickness in real time to control the uniformity during the thinning process.

4. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: In the step S3, when the etching and thinning process is carried out, the etching liquid needs to be slowly stirred to maintain uniform flow.

5. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: In the step S3, when the lens is cleaned after the etching and thinning process is completed, an alkaline solution may be used to rinse the surface of the lens to neutralize the acidic residue.

6. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: The step S1 includes the following steps: selecting optical glass with high refractive index and low dispersion; material pretreatment: cutting the glass substrate into a blank shape and cleaning it to remove surface impurities; using pure water ultrasonic cleaning for 5 minutes at a temperature of 30°C to ensure a clean surface before entering the molding process.

7. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: The step S2 comprises the following steps: using a high-hardness tungsten steel mold, the surface of which is subjected to ultra-precision CNC machining and diamond tool finishing to obtain submicron smoothness; the mold temperature during the compression molding process is controlled at 550-600°C to ensure that the lens material is molded under appropriate fluidity, too low a temperature may lead to incomplete molding, and too high a temperature may generate internal stress; the compression molding uses a vertical pressurization method, the pressure is in the range of 100-300MPa, and is continuously applied for 15 seconds; after molding, the lens blank needs to be cooled to room temperature at a slow cooling rate to reduce stress, and then demolded at 30°C to obtain a lens blank.

8. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: The step S4 includes the following steps: using low-temperature plasma equipment to polish the surface of the lens in a vacuum chamber, and the polishing time is controlled within 5-10 minutes; plasma removes tiny surface protrusions to make the surface roughness reach less than 5 nm; the working pressure of the plasma is set at 50-100 Pa, and the power is controlled at 80-120 W.

9. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: The step S5 comprises the following steps: using low temperature ion evaporation method to coat a multilayer antireflection film; each layer has a thickness of 100-150nm; the coating temperature is controlled at 50-100°C to avoid deformation or stress on the lens caused by high temperature to meet the high transmittance requirements of the ultra-thin lens; and a hydrophobic layer is coated on the antireflection film with a thickness of 10-20 nm to enhance the anti-fouling and waterproof capabilities.

10. The manufacturing process of the ultra-thin high-definition camera lens according to claim 1, characterized in that: The step S6 includes the following steps: using a laser thickness gauge to control the thickness tolerance within ±0.5µm; using an optical surface detector to inspect the surface defects (such as scratches and bubbles) of the lens; testing the transmittance and reflectivity of the lens to ensure that the transmittance is ≥95% and the reflectivity is ≤0.5%.