Multi-layer optical storage using pre-orientation in a glassmatrix

An orientation, optical data technology, applied in optics, nonlinear optics, optical record carriers, etc., can solve problems such as high complexity and high cost

Inactive Publication Date: 2005-08-31
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is the use of electrodes

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  • Multi-layer optical storage using pre-orientation in a glassmatrix
  • Multi-layer optical storage using pre-orientation in a glassmatrix
  • Multi-layer optical storage using pre-orientation in a glassmatrix

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Embodiment Construction

[0034] The present invention relates to providing an optical computer readable medium, and in particular to optical storage using an anisotropic polymer network.

[0035] will now give the attached figure 1The illustrations of the upper, middle, and lower figures in, for providing schemes of computer readable media in accordance with a preferred embodiment of the present invention, these figures illustrate the process of forming a sparse liquid crystal (LC) layer comprising LC molecules in a metastable orientation. different states. Such an LC layer can be obtained by first applying the mixture on a substrate pre-coated with an alignment layer. This mixture is prepared by dissolving in a solvent a few percent of the liquid crystal molecules 102 of the first type (the liquid crystal molecules 102 have the ability to cross-link with each other, i.e. they are reactive), a certain amount of a dichroic fluorescent dye molecules 106 and molecules 104 of the second type of liquid c...

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Abstract

The invention relates to producing an optical memory which combines stability of written and non-written data with high writing speed and good sensitivity during writing, such an optical memory as well as a method of writing in such a memory. The optical memory has a liquid crystal (LC) layer with a first type of LC molecules (102) aligned in one direction, forming a polymer network, and a second type of LC molecules (104) oriented in a perpendicular direction, in which the orientation of said second type of LC molecules is meta-stable. By making use of a force, exerted on the second type of LC molecules (104), by the network of aligned crosslinked molecules, an increase in relaxation rate for the second type of molecules (104) from a meta-stable state of orientation, is achieved, which makes it possible to use said relaxation for writing data at an increased writing rate.

Description

technical field [0001] The present invention relates generally to optical storage devices and, in particular, to a computer readable medium employing pre-orientation in a glass substrate for optical data storage and a method of producing the same. Background technique [0002] In the field of optical data storage it is well known that liquid crystal molecules having a glass transition temperature can be used. For example, an optical recording medium is mentioned in the document US5976638, which includes a liquid crystal polymer film in the same direction, and the film contains a glass transition temperature T g The liquid crystal molecules and dichroic dye molecules are oriented perpendicular to the film surface. [0003] In general, the absorption dipole moment of a dichroic dye is aligned with the long axis of the chromophore, therefore, the absorption of the dichroic dye molecule is well-directed. [0004] In the unwritten film, the liquid crystal molecules are isotropi...

Claims

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Application Information

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IPC IPC(8): G02F1/13G02F1/1334G11B7/0045G11B7/24G11B7/24033G11B7/25G11B7/26
CPCG11B7/25
Inventor E·皮特斯D·J·布罗尔C·布希
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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