Optical system, hollow glass comprising such optical system, method for manufacturing same, and method for protecting optical system

[0059] Several specific embodiments of the invention are described below. It is to be understood that the present invention is by no means limited to these particular embodiments and that other embodiments may, of course, be practiced.

[0060] like figure 1 As shown, the present invention relates to an optical system 10 comprising at least:

[0061] - an optical element 20 comprising a glass functional substrate 1 and an electrochromic stack 2 formed on the substrate 1, and

[0062] - a protective layer 3, which is provided on the electrochromic stack 2, said protective layer 3 comprising an inorganic lubricating compound.

[0063] A protective layer 3 can in particular be deposited on the electrochromic stack 2 .

[0064] Here, the electrochromic stack 2 comprises:

[0065] - the first transparent conductive layer,

[0066] - a working electrode disposed above the first transparent conductive layer,

[0067] - a counter electrode, which is arranged above the working elect