Tesa Scribos Gmbh

Thomson Licensing S.a.

Deutsche Thomson-brandt Gmbh

Thomson Licensing

Christoph Dietrich

Steffen Noehte

Stefan Stadler

Jörn Leiber

Matthias Gerspach

Robert Thomann

Hartmut Richter

Kay Schulte-Wieking

Steffen Scheibenstock

Christian Büchler

Lieu Kim Dang

Anna Blazejewski

Heinz-J&ouml;rg Schroeder

Tobias Kresse

Annouschka Blazejewski

Heinz-Joerg Schroeder

Stefan Borgsmüller

Lieu-Kim Dang

Susann Ayari

Stefan Röber

Michael Mayer

Stefan Borgsmueller

Steffan Noehte

Stefan Borgsmūller

Christoph Jürgens

A reader for reading computer-generated individualized holograms which are written into a storage medium, having a light source for generating a light beam, a recording means for acquiring image data generated by the light beam by illuminating the individualized hologram, and display means for displaying the display data generated from the image data, wherein all the components are combined in a portable handheld unit.

Reader for reading computer-generated lithograms

An apparatus for reading a hologram, in particular a computer-generated hologram, that includes a radiation source for irradiation of the hologram with a read beam composed of electromagnetic radiation, and an outlet opening for receiving an image that is produced from the hologram. The apparatus may allow both greater variability and greater convenience in use with a simple design. The apparatus further includes optics having at least two lenses in which a focal point of the first lens and a focal point of the second lens are each arranged essentially on one plane, and in which the hologram is arranged in front of the second lens as viewed along the beam direction.

Apparatus for reading a hologram

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

A reader for reading computer-generated lithograms which are written into a storage medium, having a light source for generating a light beam, having recording means for acquiring the image data generated by the light beam by illuminating the lithogram, and having display means for displaying the display data generated from the image data, wherein all the components are combined in a portable handheld unit. This reader solves the object of specifying a manageable reader which has great variability in reading the information contained in the dot distribution of a computer-generated lithogram.

The invention relates to a method for optimized tracking of an optical scanner along a track of an optical recording medium, the track having information markings arranged in dense succession, and also having fundamental changes in properties in significantly lower density. The method has the following steps: formation of a track error signal, detection of the occurrence of fundamental changes in properties of the track, formation of an offset value from the comparison of the value of the track error signal that occurs shortly before and shortly after the fundamental change in properties, formation of the track error signal, taking account of the offset value and repetition of the aforementioned steps.

Optimized tracking method

Producing a digital hologram-in a storage medium includes: (i) focusing a write beam onto the storage medium; (ii) moving the write beam two-dimensionally relative to the storage medium; (iii) focusing a scanning beam onto a beam-guiding mask having a plurality of tracks; (iv) moving the scanning beam two-dimensionally relative to the mask, the movement of the scanning beam being coupled with the movement of the write beam; (v) generating a position control signal when the position of the scanning beam deviates from the scanned track by a predefined value; (vi) controlling the position of the write beam on the storage medium with the aid of the position control signal; and (vii) writing the hologram by introducing radiation energy point by point, the intensity of the write beam being controlled as a function of the position of the write beam on the storage medium.

Lithograph with beam guidance and method of producing digital holograms in a storage medium

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

In a method of entering information into an optically writable and readable data storage medium having a polymer film which can be changed locally by heating in order to store information and to which there is assigned an absorber dye () which is set up to absorb a write beam (), at least partly, and to transfer the heat produced in the process, at least partly, locally to the polymer film, first of all the absorber dye is heated locally in a predetermined region of the polymer film in accordance with the information to be entered, specifically by means of a pulsed write beam (). After that, the absorption properties of the absorber dye () are changed by means of light, to be specific preferably by means of a fixing beam () which bleaches () the absorber dye () in the written region of the polymer film.

Method for inputting information into a data storage medium that is optically recordable and readable

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 lithograph for producing digital holograms in a storage medium (), having a light source () for producing a write beam () with a predefined beam cross section, having a writing lens () for focusing the write beam () onto the storage medium () to be written, the writing lens () being arranged in a lens holder (), and having drive means for the two-dimensional movement of the write beam relative to the storage medium. The technical problem of writing computer-generated holograms as quickly as possible and with little effort by means of optical lithography is solved in that a first drive device () is provided for moving the lens holder () substantially at right angles to the write beam () and in that the aperture of the writing lens () is smaller than the beam cross section of the write beam (). The inventon also relates to a method for the lithographic production of a hologram in a storage medium.

Growing community of inventors

Heidelberg, Germany

Christoph Dietrich