US 2009/0154318 A1 · Device and method for microstructuring a storage medium and storage medium comprising a microstructured region

Abstract

A device providing for microstructuring a storage medium includes a radiation source for producing an at least partially coherent beam from electromagnetic radiation, a modulator-provided with a plurality of individually switchable modulator elements, a beam-forming optical element for illuminating the modulator, a reducing optical element for reducing a beam radiated by the modulator, and a transport table for displacing the storage medium in relation to the reducing optical element. The device solves technical problems caused by writing of microstructuring and individual diffractive optical elements, in particular computer-generated holograms having a high speed and high writing energy. The device is achieved in that the reducing optical element is configured with limited diffraction and produces a surface reduction of at least 25 from a surface of the individually switchable modulator elements.

Claims20

Dependent claims

A device for autofocusing an imaging optical unit of a writing device for microstructuring a storage medium, wherein a distance and/or a tilting of the imaging optical unit relative to the storage medium is regulated, comprising:

at least two light sources,
at least one beam splitter for directing light beams generated by the at least two light sources onto the imaging optical unit,
at least two detectors for analyzing light beams reflected by the storage medium,
at least one beam splitter for directing a light that is reflected by the storage medium and runs through the imaging optical unit onto the at least two detectors, and
a lens for focusing the light reflected by the storage medium onto the at least two detectors.

2 more elements

A method for autofocusing an imaging optical unit of a writing device for microstructuring a storage medium, wherein a distance and a tilting of the imaging optical unit relative to the storage medium are regulated, wherein

a light beam is generated by at least one light source and directed onto the imaging optical unit,
the light beam is directed onto a surface of the storage medium and reflected by the storage medium,
the distance between the imaging optical unit and the surface of the storage medium is determined at least two points of the surface, and
measured distances are used to determine and regulate the distance and the tilting.

1 more element

Dependencies are inferred from the claim text.

Device and method for microstructuring a storage medium and storage medium comprising a microstructured region

Life of this patent

Device and method for microstructuring a storage medium and storage medium comprising a microstructured region

Life of this patent

Abstract

Claims20