Tesa Scribos Gmbh

Beiersdorf Ag

Matthias Gerspach

Steffen Noehte

Christoph Dietrich

Stefan Stadler

Jörn Leiber

Robert Thomann

Anna Blazejewski

Tobias Kresse

Kay Schulte-Wieking

Stefan Borgsmüller

Steffen Scheibenstock

Annouschka Blazejewski

Stefan Borgsmūller

Stefan Borgsmueller

Michael Mayer

J&ouml;rn Leiber

A holographic data storage medium includes a polymer film which is set up as a storage layer and whose surface structure can be changed locally by heating. The polymer film is set up for the storage of holographic information via the local surface structure of the polymer film. A reflective layer can be provided on the data storage medium.

Holographic data memory

The present invention relates to a method of producing digital holograms in a storage medium, in which the technical problem of writing computer-generated holograms by means of optical lithography as quickly as possible and with little effort with simultaneous accurate control of the timed triggering and the positioning of the write beam is achieved in that a write beam is focused onto the storage medium and moved one-dimensionally relative to the storage medium, in that a scanning beam is focused onto a trigger mask having a plurality of trigger lines and moved one-dimensionally transversely relative to the trigger lines, the movement of the scanning beam being coupled with the movement of the write beam, in that, during the scanning of the trigger lines, a timed trigger signal is generated as a function of the arrangement of the trigger lines, in that, with the aid of the timed trigger signal, the intensity of the write beam on the storage medium is controlled, and in that the hologram is written line by line by introducing radiation energy point by point, the storage medium being displaced transversely with respect to the scanning direction of the lines by a predefined distance to write adjacent lines of the hologram. The technical problem is also solved by a lithograph for producing digital holograms.

Lithograph with one-dimensional trigger mask and method of producing digital holograms in a storage medium

The invention relates to a method for identifying articles, wherein article identification data are made available and the article is provided with a hologram representing said data so that the article can be identified by way of an intensity profile corresponding to said hologram. To this end, article-identifying individual data are provided, a hologram profile is digitally calculated using said individual data, and an intensity modulation of the hologram-producing beam is determined. The hologram-producing beam transfers the hologram pixels onto a hologram support that is associated with the article to be identified so that the article can be identified by way of the intensity profile reproduced from the associated hologram support.

Method for identifying articles

A lithograph for producing digital holograms in a storage medium includes a light source for producing a write beam, the light source having drive means for the two-dimensional movement of the write beam relative to the storage medium and having a first objective for focusing the write beam onto the storage medium. Writing computer-generated holograms by means of optical lithography is solved in that: a two-dimensional trigger matrix is provided, means of producing a scanning beam are provided, a second objective for focusing the scanning beam onto the trigger matrix is provided, the drive means moves the scanning beam two-dimensionally relative to the surface of the trigger matrix, the movement of the scanning beam being coupled with the movement of the write beam, and means for generating a trigger signal to control the intensity of the write beam are connected to the trigger matrix.

Lithograph with a trigger mask and method of producing digital holograms in a storage medium

A method for the calculation and storage of a computer-generated multilayer hologram with more than or equal to 2 holograms includes the following steps. Field Aof a readout beam and field Ain the reflection plane are preset as mathematical functions. Except for the hologram to be calculated, all the other holograms of the layer structure are also preset as mathematical functions. Fields A/Aare then calculated on both sides of hologram h, as a result of which hologram function h, is calculated by forming a quotient from fields A/A.

Methods for calculating multilayer holograms, method for producing multilayer holograms and storage medium comprising a multilayer hologram

A holographic data storage medium has a polymer film which is set up as a storage layer whose refractive index can be changed locally by heating. The polymer film is set up for the storage of optical phase information via the local optical path length of the polymer film, which is illuminated in transmission when the information is read out. To the polymer film, there can be assigned an absorber dye, in order to at least partly absorb a write beam to input information and to give up the heat produced in the process at least partly locally to the polymer film. Preferably, a reflective layer is arranged behind the polymer film.

In an example holographic data storage medium, which has a polymer film which serves as a storage layer and can be changed locally by heating, the polymer film is set up as a top layer of the data storage medium. Arranged underneath the polymer film is an absorber layer which has an absorber dye. The absorber dye is set up to at least partly absorb a write beam serving to put information in and to discharge the heat produced in the process at least partly locally to the polymer film. In an advantageous refinement of the example data storage medium, there is an adhesive layer underneath the absorber layer and a partly transparent reflective layer between the polymer film and the absorber layer.

Holographic data-storage medium

The invention relates to a method of providing an article with identifying information, in which a hologram is provided from which at least first and second hologram patterns separated physically from each other can be reproduced. In this case, provision is made for the hologram to be produced in such a way that the first and second hologram patterns can generally be reproduced in one and the same direction but in different planes.

Double hologram

The invention relates to a commonplace object with an outer surface () that encircles the commonplace object () and with at least one cylindrical section () of the surface (), in which the technical problem of specifying a commonplace object to whose surface a relatively large amount of information can be applied is solved in that the cylindrical section () of the surface () consists of a material which can be changed optically, and in that a data bit sequence is written along at least one track () on the cylindrical section ().

Commonplace object with a surface that comprises a data track

An adhesive security tape comprises a polymer film whose refractive index and/or interface structure can be changed locally by heating. Disposed below the polymer film is an absorber layer comprising an absorber dye set up at least partly to absorb a write beam directed onto the absorber layer, to emit at least some of the generated heat to the polymer film locally, and in doing so to undergo local change itself. Below the absorber layer there is an adhesive layer. The adhesion between the adhesive layer and the absorber layer is greater than the adhesion to the polymer film. There is preferably a partly transparent reflection layer between the polymer film and the absorber layer.

Adhesive security tape

A data storage medium ( ) comprises an information carrier which is wound in a spiral fashion and on which information units are provided which can be read optically. The information carrier is optically transparent.

Growing community of inventors

Dossenheim, Germany

Matthias Gerspach