Series of lenses

US5854669A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Helmut Altheimer · Munich, DE
• Norbert Awrath · Munich, DE
• Rudolf Barth · Hohenkirchen, DE
• Peter Baumbach · Hersbruck, DE
• Jochen Brosig · Grünwald, DE
• Gregor Esser · Munich, DE
• Monika Fuess · Munich, DE
• Guenther Guilino · Munich, DE
• Walter Haimerl · Munich, DE
• Christine Meixner · Munich, DE
• Herbert Pfeiffer · Munich, DE
• Manfred Rohrbach · Hebertshausen, DE

Key dates

• Filing date: Mar 21, 1996
• Grant date: Dec 29, 1998
• Expiry date: Mar 21, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/08
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The present description refers to a series of progressive lenses, wherein the lenses present a different surface power in the distance-vision part and/or a different increase of the surface power from the distance-vision part towards the near-vision part (termed addition Add hereinafter), and whereof each PA1 comprises a front surface having a continuously varying surface power which increases from the respective value BK dpt!, which is suitable for distance vision, at the point having the coordinates x=0 mm, y=8 mm in the lower region of the distance-vision part along a wound line (primary line), which coincides approximately with the primary line of view, with eyes dropped, towards a value suitable for near vision in the upper region of the near-vision part, which value is greater than the value of the surface power BK in the lower region of the distance-vision part by the value ADD dpt! of the addition, and PA1 having a surface, in particular the surface on the concave side, which has a spherical shape or an aspherical shape, respectively. The present invention is characterized by the aspects that for the maximum height y of the line on which the surface astigmatism is 0.5 dpt a…