Carl-zeiss-stiftung

Erwin J Daniels

Hermann Schurle

Siegfried Korn

Horst Schneider

Wilhelm Schmidt

Bernhard Ganswein

Bernd Kratzer

Herman Schurle

Klaus Grosskopf

A method of producing a marking on a spectacle lens. For producing the marking, those regions on the surface of the spectacle lens which are to define the form of the marking are irradiated with an excimer laser through a mask which contains the marking in the form of a cutout.

Method for producing a marking on a spectacle lens

The invention is directed to a multifocal spectacle lens having an especially large near-vision part. A supplementary component is fused into a base dimensioned for the near-vision range. The supplementary part is for at least one distance-vision range. In this connection, it is especially advantageous to select the refractive index of the base to be greater than the refractive index of the supplementary component. Compared to known multifocal lenses made in one piece, the multifocal lens of the invention avoids steps or substantial image jumps between the near-vision and distant-vision regions. For shortsighted wearers of spectacles, the lenses are thinner and therefore lighter.

Multifocal spectacle lens having a large near-vision part

Two prismatic wedges of a prismatic compensator are rotated in opposite directions by the same angular quantity for adjusting the prismatic effect with the aid of a crossed-over pull wire. The pull wire is changed in direction by means of two rollers. The pull wire encloses the fittings under pulling tension so as to be free of slippage and free of play.

Drive for a prismatic compensator

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.

Ophthalmic lens with a marking and method of producing the marking

A multifocal spectacle lens having a single base lens member and at least two additional parts adjacent to each other, attached to the base lens member by fusing or cementing. These additional parts are so shaped that imaginary tangential planes lying in the center of separation lines between the additional parts and tangential to the curved surfaces which effect changes in power extend in pairs of planes which are parallel to each other, in a manner to avoid any jump in the image when the line of sight moves from one of the additional parts to the adjacent additional part.

Multifocal spectacle lens

The invention contemplates a circular spectacle-lens blank which is optically finished on both its front and back surfaces and which is characterized by locally hardened registering central areas of both surfaces. The hardened areas are sized to be universally included within the spectacle-frame profile of all frames within a given variety of frames, and the outer annular areas are unhardened and of such effective radial extent as to embrace all of such profiles within said variety, so that each finished and hardened blank is adapted for later edging to the profile of a later selected one of the frames within the given variety. Various methods are described for creating the indicated locally hardened regions on the otherwise-finished lens blanks.

Growing community of inventors

Aalen, Germany

Erwin J Daniels