What causes optical lens damage to use ultrasonic cleaning

by:Crylight     2021-05-27

Whether it is an optical lens made of inorganic material or organic material, in daily use, friction with dust or grit (silicon oxide) will cause the lens to wear and scratches on the surface of the lens. Compared with glass flakes, organic materials have lower hardness and are more prone to scratches. Through the microscope, we can observe that the scratches on the lens surface are mainly divided into two types. One is the scratches caused by grit, which is shallow and small, which is not easy for the wearer to detect; the other is the scratches caused by the larger grit. , Deep and rough periphery, in the center area will affect vision.

   Then the wear of the lens will be reduced by coating the lens, which can improve the quality of the lens and prolong the service life of the lens.

'Optical lens' During the installation of optical lens, if the method is not correct, the lens will be contaminated. Therefore, the operating procedures must be followed.

   If a large number of lenses need to be installed and removed, it is necessary to design a fixture to complete the task. A dedicated fixture can reduce the number of contact with the lens, thereby reducing the risk of lens contamination or damage.

   In addition, if the lens is not installed correctly, the laser system will not work properly or even be damaged. All carbon dioxide laser lenses should be installed in one direction. Therefore, the user should confirm the correct orientation of the lens.

   During the installation and cleaning of optical lenses, any sticky matter, even nail marks or oil drops, will increase the absorption rate of the lens design lens and reduce the service life. Therefore, the following precautions must be taken:

  1) Never install the lens with your bare fingers. Wear finger cots or rubber gloves.

  2) The lens should be placed in a dry and tidy place for testing and cleaning.

  3) Do not touch the film when taking the lens, but hold the edge of the lens.

  4) Do not use sharp instruments to avoid scratches on the surface of the lens.

  5) Users should avoid talking above the optical lens, and keep food, beverages and other potential contaminants away from the work environment.

  In optical cold processing, the cleaning of optical lens mainly refers to the cleaning of residual polishing fluid, adhesive, and protective material laser lens after lens polishing; optical lens edging after edging Cleaning of oil and glass powder; cleaning of fingerprints, saliva circle and various attachments before lens coating.

  The traditional method of cleaning optical lenses is to use wiping materials (gauze, dust-free paper) with chemical reagents to soak and wipe them manually. This method is time-consuming, labor-intensive, and has poor cleanliness, which is obviously not suitable for the modern large-scale optical cold processing industry. Sonic cleaning technology gradually entered the optical cold processing industry and showed its talents, which further promoted the development of the optical cold processing industry.

The basic principle of    ultrasonic cleaning technology can be roughly considered to be the use of the huge force generated by the ultrasonic field, with the cooperation of the cleaning medium, to promote the mass generation of the high-power laser lens A series of physical and chemical changes to achieve the purpose of cleaning. When the high-frequency vibration higher than the sound wave is transmitted to the cleaning medium, the liquid medium produces nearly vacuum cavity bubbles under the high-frequency vibration. The cavity bubbles collide, merge, and die in the process of making the liquid partly instantaneous. A pressure of several thousand atmospheres is generated, and such a large pressure causes a series of physical and chemical changes in the surrounding materials.

   This effect is called cavitation; when the natural frequency of the cavity bubble is equal to the ultrasonic frequency, resonance can occur, and a large amount of heat energy is accumulated in the resonant cavity bubble , This kind of heat energy is enough to break the chemical bonds of surrounding materials and cause physical and chemical changes.

   The ultrasonic field provides a huge amount of energy for cleaning the mirror, but it also needs a chemical lotion as a medium. Generally, chemical lotions are divided into two categories. One is organic solvents, which are mainly based on the chemical principles of similar compatibility to dissolve organic substances such as adhesives, protective materials, and edging lubricants.

   Another type of cleaning agent that is currently used more is a water-based cleaning agent with surfactant as the main component. The cleaning principle is simply due to the surfactant The molecular structure also contains lipophilic groups and hydrophilic groups, which are characterized by polarity and structural asymmetry. It is this characteristic that makes it can greatly reduce the surface tension of the aqueous solution, so that the surface of the object is easy to wet, and the surface dirt is easy to be dissolved and dispersed in the cleaning liquid to achieve the purpose of washing.

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