Power control for optical disc recorder

Details Power control for optical disc recorder Power control for optical disc recorder

G - Physics

11

B

352/32.2

G11B 7/12 (2006.01) G11B 7/0045 (2006.01) G11B 7/125 (2006.01) G11B 27/36 (2006.01)

Patent

CA 1233904

ABSTRACT OF THE DISCLOSURE The invention concerns a device for recording data in an optically detectable form at the surface of a data support comprising a material sensitive to optical radiation, the said device comprising means for focussing in the said surface a writing optical beam electrically modulable by an incident electric signal representative of the said data, means ensuring the exploration of the said surface by the said writing beam, electrooptical reading means the interaction of which with the modifications of optical characteristics of the said surface produces an electric reading signal and control means allowing to adjust the power of the writing beam in such a way that the reading signal suitably reproduces the temporal distribution of the impulses constituting the said incident electric signal, wherein binary test words are registered separately from the said data with several staggered power values of the said beam in reserved zones of the said surface and wherein the analysis of the reading signal corresponding to these values allows to determine which of the said values is most suitable for recording the said data in a section adjacent to the said zones; the said control means comprising a calibrating circuit associated to a control or drive circuit of the radiation supply; the said calibrating circuit comprising a memory logic circuit controlling the writing and the reading of the said binary test words according to a predetermined cycle and an analysis circuit of the reading signal delivering tested values to the memory logic circuit, in order to set a power value on the writing beam, retained until the following cycle.

454474

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