Background Technology for Crucible for Optical Coating

Background Technology

Vapor deposition is a vacuum coating technology that belongs to physical vapor deposition. Vapor deposition is an important aspect of vacuum applications. It is a new process for the preparation of thin films for scientific research and practical production based on vacuum technology, using physical or chemical methods and incorporating a range of new technologies such as electron beam, molecular beam, ion beam, plasma beam, radio frequency and magnetron. Simply put, the method of evaporating or sputtering a metal, alloy or compound in a vacuum to solidify and deposit it on the object to be coated (called a substrate, substrate or substratum) is called vacuum coating.

Vacuum coating involves placing the vaporized material in a crucible, and by heating the crucible, the material inside the crucible is converted from a solid state to a gaseous state of atoms, atomic groups or molecules, which then coalesce onto the surface of the substrate to be coated to form a thin film. This technology is widely used in optical lens coating, optical communications, solar cells and liquid crystal displays.

The crucible structure of the prior art is shown in Figures 1 and 2, which is processed using pure copper material with a melting point of 1083°C. The crucible structure has a flat bottom surface and curved sides. During the heating of the crucible, the heating temperature is high, the heat dissipation efficiency is low, and the mechanical strength is poor, which makes the crucible easily deformed, resulting in a short service life of the crucible, usually about 1 month.

Therefore, for the above technical problems, it is necessary to provide a crucible for optical coating.

Technical realization element

In view of this, the purpose of the present utility model is to provide a crucible for optical coating.