What is UV (ultraviolet light, also known as)  (Ultra-Violet Ray) the title. Industrial UV wavelength to 200 nm to 450 nm for its scope of application. By UV exposure to "UV radiation can be hardened material" and it hardening process, Okayama call UV Curing Process.

What is UVA, UVB, UVC and UVV? Used in industrial UV wavelength 200 - 450 nm range, we put it into four regions: UVA: 320 - 390 nm UVB: 280 - 320nm UVC: 280 nm following UVV: 390 nm or more