Workplace screen lens

US7338162B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Helmut Altheimer · Munich, DE
• Gregor Esser · Munich, DE
• Walter Haimerl · Munich, DE
• Edda Wehner · Grafing, DE
• Andrea Welk · Munich, DE

Key dates

• Filing date: Oct 25, 2004
• Grant date: Mar 4, 2008
• Expiry date: Oct 25, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/066
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A workplace screen lens, having a workplace screen lens optimized at the middle of the lens for the middle viewing distances of approximately 60 centimeters to approximately 90 centimeters, and the progressive channel at the middle of the lens is at least 4 millimeters wide. The effect increases from the middle of the lens toward the bottom with the vertical coordinate y equal to approximately 0, reaching a near vision zone with an essentially constant effect at y equal to approximately −12 millimeters. The progressive channel has a width of least 15 millimeters in the near vision zone, preferably at the near-reference point, the effect decreases from the middle of the lens up to y equal to approximately +10 millimeters to approximately +12 millimeters above the middle of the lens. The progressive length amounts to approximately 20 millimeters to approximately 25 millimeters, the main progressive length is between approximately 7 millimeters and approximately 12 millimeters, and the minimum width of the progressive channel amounts to at least 4 millimeters.