How to Optical overwriting?

Q: How to Optical overwriting?

Magnetic disk device,Optical data transfer,Method for producing a security element for a security document, method for producing a security document, method for personalising a security document, security element for a security document, security document and id document

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3results about "Optical overwriting" patented technology

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Magnetic disk device

PendingCN121708967AOptical overwritingRecord information storageControl engineeringControl theory

The embodiment of the invention provides a magnetic disk device capable of appropriately executing a rewrite operation caused by ATI. A controller of a magnetic disk device according to the present embodiment adds a count value corresponding to a storage region in the vicinity of one of a plurality of storage regions in accordance with a write operation. The rewriting operation includes a seek operation, a stabilization operation waiting for attenuation of residual vibration of the magnetic head, and a rewriting of all data in the first storage area to the first storage area after the stabilization operation. The controller reduces a value of a count corresponding to the first storage area among the plurality of counts in accordance with the rewrite operation. The controller adds a value of a count corresponding to the second storage area among the plurality of counts in accordance with the rewrite operation. The stabilization operation includes an operation for determining whether or not the stabilization operation has been completed on the basis of whether or not a first condition is satisfied. The first condition varies depending on the opportunity of the execution of the retry operation.

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Owner:KK TOSHIBA +1

Optical data transfer

ActiveUS12300290B2Optical overwritingOptical beam guiding meansOptical data transmissionLight beam

In an optical data transfer system, a beam modulator is configured to embed a set of data in an input beam. A multimode optical waveguide network has an in-coupling region for receiving the input beam. The multimode optical waveguide network is configured to guide the input beam to an out-coupling region of the multimode optical waveguide network. A spatial coherent detector is configured to measure a phase and an amplitude of an output optical field at multiple locations. The output optical field is at least partially defined by the input beam and thus exhibiting distortion effects caused by the passage of the beam through the multimode waveguide network. Signal processing is applied to an output of the spatial coherent detector, in order to compensate for the distortion effects, and thereby recover, from the output of the spatial coherent detector, the set of data embedded in the input beam.

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Owner:MICROSOFT TECHNOLOGY LICENSING LLC

Method for producing a security element for a security document, method for producing a security document, method for personalising a security document, security element for a security document, security document and id document

ActiveEP4116778B1Holographic light sources/light beam propertiesOptical overwriting

The invention relates to a method for producing a security element for a security document, comprising the following steps: providing a hologram layer (6); producing a hologram in the hologram layer (6), wherein light is shone onto the hologram layer (6) and the produced hologram is visible when viewing the hologram layer (6) at a certain angle; and creating defects (9) in the hologram, wherein the hologram in the hologram layer (6) is locally disrupted by shining pulsed light beams onto it and the defects (9) are visible when viewing the hologram layer (6) at a certain angle. Furthermore, a method for producing a security document with a security element, a method for personalizing a security document, an ID document, and a security element for a security document are provided.

Method for producing a security element for a security document, method for producing a security document, method for personalising a security document, security element for a security document, security document and id document

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Owner:BUNDESDRUCKEREI GMBH