Patent ID: 6073296
Filing Date: 2000-06-13
Classification: A42B,A61F,B08B,B60S

Abstract:
An optical protective screen for improved visibility, comprised of:a drive mechanism for transporting a transparent sheet in a transport direction, which sheet is disposed in a field of vision of an optical apparatus or a human observer;cleaning brushes oriented generally transversely to the transport direction of the sheet; said brushes being disposed on at least one side of the field of vision and applied against said sheet, anda frame having a window opening with lateral sides, which frame has two enclosures disposed near the lateral sides of the window, wherein the sheet includes a film which is transported in the window between the two enclosures, the transporting being alternately in one direction and then the other with aid of said drive mechanism, and the brushes being disposed at or near the respective sides of the window.