Patent ID: 11959782
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A reflective coating of a reflection means for reflecting a light beam emitted by a light source of an optical encoder, the reflection of the light beam being directed toward a photoreceptor, the reflective coating comprising:
at least one flat lamella made of glass, a first face of which forms a connection means to one portion of the reflection means of said optical encoder, and a second face, opposite the first face, of which forms a connection means with at least one layer made of at least one material having a reflection coefficient greater than 96% for wavelengths of the light beam to be reflected, said at least one material having a reflection coefficient greater than 96%, being gold or an alloy based on gold, and said at least one layer further comprising a layer of protective material for protecting the layer of gold or alloy based on gold, wherein the layer of protective material is totally transparent, optically neutral, and maintains a constant reflection coefficient over a period of at least 20 years and without affecting a nominal thickness of the coating.