Patent ID: 10386041

Abstract:
A selection device (2) for a beverage preparation machine (1), comprises a fixed selection element (3) and a mobile selection element (4), the fixed selection element (3) comprising a set of marks (33) each corresponding to a parameter value, the mobile selection element (4) being movable in relation to the set of marks (33) for selecting a parameter value by positioning the mobile selection element (4) in visual association with a selected mark (33X). The selection device (2) further comprises a light-sending layer which is disposed in the fixed selection device (3), a polarization layer for polarizing said sent light, and at least one polarization modifying layer able to modify the polarization of the polarized light such that the visual aspect of a selected mark (33X) is modified when the mobile selection element (4) is positioned in visual association with the selected mark (33X), the polarization modifying layer being disposed in superposition relative to the polarization layer and relative to the selected mark (33X).