Optical data storage system and method of optical recording...

G - Physics – 11 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G11B 7/12 (2006.01) G11B 7/09 (2006.01)

Patent

CA 2562879

An optical data storage system for recording and/or reading, using a radiation beam, having a wavelength .lambda., focused onto a data storage layer of an optical data storage medium is described. The system comprises the medium having a cover layer that is transparent to the focused radiation beam, an optical head, including an objective having a numerical aperture NA, said objective including a solid immersion lens that is adapted for being present at a free working distance of smaller than .lambda./10 from an outermost surface of said medium. The optical head comprises a first adjustable optical element corresponding to the solid immersion lens, means for axially moving the first optical element and dynamically keeping constant the distance between cover layer and solid immersion lens, a second adjustable optical element, means for dynamically adjusting the second optical element for changing the focal position of the focal point of the focused radiation beam relative to an exit surface of the solid immersion lens. This achieves reliable read-out and writing during cover layer thickness variations. Further a method is described for controlling such a system.

L'invention concerne un système optique de stockage de données permettant d'effectuer un enregistrement et/ou une lecture à l'aide d'un faisceau de rayonnement dont la longueur d'onde est .lambda. et focalisé sur une couche de stockage de données d'un support optique de stockage de données. Ledit système comprend un support doté d'une couche de recouvrement qui est transparente au faisceau de rayonnement focalisé, une tête de lecture optique équipée d'un objectif à ouverture numérique NA, ledit objectif comprenant une lentille solide d'immersion conçue pour être placée à une distance de travail libre inférieure à .lambda./10 de la surface la plus extérieure du support. La tête de lecture optique comprend un premier élément optique réglable correspondant à la lentille d'immersion solide, des moyens permettant de déplacer axialement ledit élément réglable et de conserver dynamiquement la distance constante entre la couche de recouvrement et la lentille d'immersion solide, un second premier élément optique réglable, et des moyens permettant de régler dynamiquement ce second élément optique afin de modifier la position focale du point focal du faisceau de rayonnement focalisé par rapport à une surface de sortie de la lentille d'immersion solide, ce qui permet une lecture et une écriture fiables pendant des variations d'épaisseur de la couche de recouvrement. L'invention concerne également un procédé permettant de commander ce système.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Optical data storage system and method of optical recording... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical data storage system and method of optical recording..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical data storage system and method of optical recording... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-2025314

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.