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Home > Frequently Asked Questions > Optical industry lens filters and other products encountered common vacuum coating defects should be how to solve

Optical industry lens filters and other products encountered common vacuum coating defects should be how to solve

Date：2019-08-07 09:03:11Readers：(208)

First, the common bad analysis of vacuum coating:

Membrane strength is an important indicator of lens coating and the most common defect in coatings.
The combination of the substrate and the film layer is the primary consideration, followed by the film surface hardness smoothness and film stress.

Second, the reasons for the poor film strength and countermeasures:

The combination of the substrate and the film:

Generally cleaning in the anti-reflection film is the main reason for the weak film. Since the substrate surface inevitably has some harmful impurities attached to the surface during the optical cold processing and cleaning process, the surface of the substrate has some impurities deep into the damage layer due to the optical cold processing (such as water vapor, oil vapor, cleaning liquid). , scrubbing liquid, polishing powder, etc., in which water vapor is the main), it is difficult to remove it by general methods, especially for substrates with good hydrophilicity and strong adsorption. When the film molecules accumulate on these impurities, the adhesion of the film layer is affected, that is, the strength of the film is affected.
Further, if the substrate is poor in hydrophilicity and poor in adsorption. The adsorption of the film layer is also poor, which also affects the strength of the film.

The chemical stability of the nitrate material is poor. During the process of the substrate during the pre-processing, the surface has been corroded, forming a corrosion layer or a hydrolysis layer (perhaps local, extremely thin). When the film layer is plated on the corrosion layer or the hydrolysis layer, the adsorption is poor and the film is weak.

The surface of the substrate has sputum, oil spots, gray spots, saliva points, etc., and the local film layer is poorly attached, resulting in a poor layout film.

Improve strategy:

Strengthen the degreasing treatment. If it is an ultrasonic cleaning machine, it should focus on the oil removal function and ensure the effectiveness of the deoiling solution.

The cleaning principle of the ultrasonic cleaning machine is that the workpiece is subjected to the "gasification phenomenon" generated by the ultrasonic high frequency during the cleaning process, and the system itself constantly moves up and down, which increases the friction of the liquid, so that the dirt on the surface of the workpiece can be quickly detached. Achieve its high cleanliness.

The configuration of Shenzhen Weigao optical coating ultrasonic cleaning system generally has soaking system, circulating filtration system, automatic constant temperature system throwing system, ultrasonic cleaning system, slow-drawing dehydration system, hot air drying system, closed cylinder door system, exhaust device, etc. . The equipment is environmentally friendly water-solvent washing and pure water rinsing. It is an environmentally friendly washing machine.

Shenzhen Weigao Optical Coating Ultrasonic Cleaning System The principle of the slow-drawn dewatering tank lifting structure tells you one of the advantages of cleaning products and before or after coating:

High-precision surface cleaning requires a good dewatering effect in addition to a reasonable cleaning process and configuration. If there are any spots or water spots on the surface of the workpiece, it will eventually lead to coating failure. High-purity water high-temperature slow-drawing dehydration is an indispensable process for high-precision cleaning of glass products. It effectively forms a uniform hot pure water film, quickly dissipates surface moisture, and achieves high surface cleanliness, laying a favorable foundation for subsequent drying.

Shenzhen Weigut optical coating ultrasonic cleaning system with FFU on the top:

Adding an FFU system at the top of the drying tank effectively reduces the influence of the environment on the cleaning effect; (after the workpiece is heated, the adhesion to dust is enhanced, and the negative pressure of the FFU can effectively reduce the influence of the environment on the cleaning effect, thereby Fundamentally improve the product qualification rate).

FFU pressure air system structure: an FFU laminar air supply unit is arranged at the top of the rack directly above the drying tank. The air is blown from the top to the bottom to form a negative pressure wind, so that the attachment is not easily adhered after the workpiece is heated.

FFU pressure air system function: Because the liquid temperature of the slow drawing tank is high, if there is no FFU pressure at the top, a large amount of water vapor will rise upward, and the water gas will adhere to the proposed glass again; after installing the FFU, it can be formed above. Partial positive pressure, most of the water vapor is pumped away from the suction port of the cylinder face.

It can be seen that when the optical industry lens filter and other products encounter common vacuum coating defects, you can choose Shenzhen Weigut optical coating ultrasonic cleaning system (before or after coating) to clean.