US 11,921,281 B2
Attachment device for an eyepiece or an objective lens of a long-range optical device
Alois Zangerl, Absam (AT); Martin Kuhn, Rieden (AT); Michael Socher, Lans (AT); and Philipp Gimpl, Absam (AT)
Assigned to Swarovski-Optik AG & Co KG., (AT)
Filed by Swarovski-Optik AG & Co KG., Absam (AT)
Filed on May 13, 2022, as Appl. No. 17/743,890.
Claims priority of application No. A 50375/2021 (AT), filed on May 14, 2021.
Prior Publication US 2022/0365335 A1, Nov. 17, 2022
Int. Cl. G02B 25/00 (2006.01); G02B 23/12 (2006.01)
CPC G02B 25/001 (2013.01) [G02B 23/12 (2013.01)] 25 Claims
OG exemplary drawing
 
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.