Ophthalmic lens with a marking and method of producing the marking

US4619504A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Erwin J. Daniels · Aalen, DE
• Bernd Kratzer · Aalen, DE
• Hermann Schurle · Aalen, DE

Key dates

• Filing date: Sep 2, 1983
• Grant date: Oct 28, 1986
• Expiry date: Sep 2, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/021
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention is directed to an ophthalmic lens having a marking and a method of producing the same. The lens is suitable for spectacles and the like. The method includes applying a removable adhering substance to a region of the surface of the lens body so that the peripheral outline of the substance corresponds to the marking to be formed. Then, an anti-reflection coating is applied to the lens body and, at a time thereafter, the adhering substance and the portion of the coating covering the substance is removed thereby causing a recess to be formed in the coating having a peripheral outline defining the marking. The marking formed in this way is practically invisible to a person wearing spectacles equipped with the lens of the invention. On the other hand, the marking is clearly visible when viewed in reflected light.