Abstract: A method for producing a spectral gradient filter on a substrate including: providing the substrate with a first surface to be coated; providing a shadow mask that includes a bordered coating area with an edge, wherein the geometry of the shadow mask is adjusted to the desired gradient profile of the gradient filter; creating a masked substrate by fixing the shadow mask on the first substrate surface to be coated in such a way that parts of the substrate surface are covered, but the substrate surface is essentially exposed in the coating area; and carrying out PVD coating so that parts of the shadow mask lie directly on the surface of the substrate so that no vapour migration occurs in the area of these parts during the coating process and the shadow mask is detachably fixed to the substrate so that the shadow mask can be used for several coatings.

Abstract: A method for producing a spectral gradient filter on a substrate including: providing the substrate with a first surface to be coated; providing a shadow mask that includes a bordered coating area with an edge, wherein the geometry of the shadow mask is adjusted to the desired gradient profile of the gradient filter; creating a masked substrate by fixing the shadow mask on the first substrate surface to be coated in such a way that parts of the substrate surface are covered, but the substrate surface is essentially exposed in the coating area; and carrying out PVD coating so that parts of the shadow mask lie directly on the surface of the substrate so that no vapour migration occurs in the area of these parts during the coating process and the shadow mask is detachably fixed to the substrate so that the shadow mask can be used for several coatings.