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1. WO2006040705 - NEAR FIELD OPTICAL LENS-TO-CARRIER APPROACH.

Publication Number WO/2006/040705
Publication Date 20.04.2006
International Application No. PCT/IB2005/053225
International Filing Date 30.09.2005
IPC
G11B 7/085 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
085with provision for moving the light beam into, or out of, its operative position.
G11B 7/09 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
G11B 7/135 2012.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
CPC
G11B 2007/0922
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
0908for focusing only
0917Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
0922Far-field methods
G11B 7/08511
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
085with provision for moving the light beam into, or out of, its operative position ; or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
08505Methods for track change, selection or preliminary positioning by moving the head
08511with focus pull-in only
G11B 7/1387
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation ; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power ; by sensing optical properties; Record carriers therefor
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
1387using the near-field effect
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL]/[NL] (AllExceptUS)
  • VERSCHUREN, Coen, Adrianus [NL]/[NL] (UsOnly)
Inventors
  • VERSCHUREN, Coen, Adrianus
Agents
  • CHAFFRAIX, Jean
Priority Data
04104966.911.10.2004EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) NEAR FIELD OPTICAL LENS-TO-CARRIER APPROACH.
(FR) APPROCHE OBJECTIF A SUPPORT OPTIQUE A CHAMP PROCHE
Abstract
(EN)
The present invention provides a near field optical scanning device and in particular a method of bringing a lens (24) of a near field optical scanning device from a remote position to a near field position (23) relative to the surface of a record carrier (11). The invention makes preferably use of image processing of aperture pupil images indicating the size of a gap between a Solid Immersion Lens (SIL) and the surface of the record carrier. Image analysis of the aperture pupil image allows to derive a control signal for an approach procedure for air gap distances in a range of micrometers. This allows for a fast, efficient, accurate and reliable approach procedure making use of varying velocities of a head movement. Moreover the invention allows to make use of a detection scheme for interference fringes evolving in the aperture pupil image that principally allow to alternatively generate a control signal for the approach procedure and to reduce image analysis to an analysis of the intensity of the a section of the aperture pupil image.
(FR)
La présente invention concerne un dispositif de balayage optique à champ proche et en particulier un procédé pour amener un objectif (24) d'un dispositif de balayage optique à champ proche d'une position éloignée à une position de champ proche (23) par rapport à la surface d'un support d'enregistrement (11). Cette invention met de préférence en oeuvre un traitement d'images de pupille d'ouverture indiquant la taille d'un interstice entre une lentille à immersion solide (SIL) et la surface du support d'enregistrement. L'analyse de l'image de pupille d'ouverture permet de dériver un signal de commande pour une procédure d'approche concernant des distances d'interstice d'air dans le domaine du micromètre. On obtient ainsi une procédure d'approche rapide, efficace, précise et fiable qui met en oeuvre des vitesses variables d'un mouvement de tête. De plus, cette invention permet d'utiliser un schéma de détection pour des franges d'interférence développées dans l'image de pupille d'ouverture, qui permettent principalement de produire de manière alternative un signal de commande pour la procédure d'approche et de réduire l'analyse d'image à une analyse de l'intensité d'une section de l'image de pupille d'ouverture.
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