Patent ID: 11921281
Assignee: SWAROVSKI-OPTIK AG & CO KG
Field: Optics (Instruments)
Classification: CPC G  F | IPC G

Claim 0:
1. An attachment device for at least one objective lens and/or at least one eyepiece of a long-range optical device, wherein the attachment device comprises at least one window, which is transparent at least in a visible spectral range, at least one electrical heating device for the window, and at least one electrically conductive heating layer applied to a surface of the at least one window, wherein the at least one electrical heating device comprises at least one heating controller which is configured to control a heating power by regulating a flow of current through the at least one electrically conductive heating layer, and wherein the at least one heating controller comprises at least one processor and/or at least one pulse width modulator, and wherein the at least one window with the at least one electrically conductive heating layer has a transmittance of more than 80% in the visible spectral range.