Patent ID: 8760742
Filing Date: 2014-06-24
Classification: G03H

Abstract:
1. A method for producing individualized holograms, which comprises the steps of: generating a light beam; individually modulating the light beam in a spatial light modulator resulting in an individually modulated light beam; guiding the individually modulated light beam onto a holographic recording material disposed relative to a holographic master and the individually modulated light beam is guided such that at least part of the individually modulated light beam is at least one of diffracted and reflected at the holographic master and is brought to interference with the individually modulated light beam in the holographic recording material, such that an interference pattern representing an individualized hologram forms in the holographic recording material, wherein the individually modulated light beam is moved relative to the holographic recording material and the holographic master for scanning the holographic master entirely; disposing the recording material in a manner bearing on a cylindrical drum, and continuously rotating the cylindrical drum about a drum rotation axis of the cylindrical drum during the scanning of the holographic master, the individually modulated light beam being guided such that the individually modulated light beam impinges on the cylindrical drum in a stationary fashion with respect to the drum rotation axis, although the individually modulated light beam impinges on the cylindrical drum in the stationary fashion with respect to the drum rotation axis, information transported by the individually modulated light beam moves in a manner synchronized with a drum movement; directing the individually modulated light beam via a deflection mirror, the deflection mirror being mounted such that it can be rotated about a mirror rotation axis, onto the holographic recording material, the deflection mirror being rotated at a rotational speed, such that the individually modulated light beam impinges on the holographic recording material in the stationary fashion relative to the drum rotation axis of the cylindrical drum; and defining the rotational speed of the deflection mirror such that, for the individually modulated light beam that is considered to be stationary before deflection, one of an impinging line and an impinging location of the individually modulated light beam on the holographic recording material moves in a tangential plane of the holographic recording material at a speed corresponding to a tangential speed of the holographic recording material on account of a rotation of the cylindrical drum, and a scanning speed is defined such that one of the impinging line and the impinging location of the individually modulated light beam on the holographic recording material moves, with the deflection mirror not rotating, in the tangential plane at a speed which compensates for the tangential speed of the holographic recording material on account of the rotation of the cylindrical drum.