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1. (WO2007010457) MAGNETIC ROM INFORMATION CARRIER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/010457 International Application No.: PCT/IB2006/052386
Publication Date: 25.01.2007 International Filing Date: 13.07.2006
IPC:
G11B 5/82 (2006.01) ,G11B 5/86 (2006.01) ,G11B 5/855 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
74
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
82
Disc carriers
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
86
Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
84
Processes or apparatus specially adapted for manufacturing record carriers
855
Coating only part of a support with a magnetic layer
Applicants:
NXP B.V. [NL/NL]; High Tech Campus 60 NL-5656 AG Eindhoven, NL (AllExceptUS)
RUIGROK, Jaap [NL/NL]; NL (UsOnly)
BALISTRERI, Marcello, L., M. [NL/NL]; NL (UsOnly)
KUIPER, Antonius, E., T. [NL/NL]; NL (UsOnly)
DECRE, Michel, M., J. [BE/NL]; NL (UsOnly)
Inventors:
RUIGROK, Jaap; NL
BALISTRERI, Marcello, L., M.; NL
KUIPER, Antonius, E., T.; NL
DECRE, Michel, M., J.; NL
Agent:
PENNINGS, Johannes; NXP Semiconductors IP Department High Tech Campus 60 NL-5656 AG Eindhoven, NL
Priority Data:
05106696.721.07.2005EP
Title (EN) MAGNETIC ROM INFORMATION CARRIER
(FR) SUPPORT DE DONNEES ROM MAGNETIQUE
Abstract:
(EN) The invention relates to a method of manufacturing a device (10) comprising a layer (12) having a pattern of disjunct portions (14) of magnetic material (18) generating a corresponding pattern of local magnetic fields (2). The magnetic material (18) is constituted of particles (22) dispersed in a solid substance (24). The particles are magnetically stable and substantially aligned for generating the local magnetic fields (2). The method comprises the steps of: providing a substance (32) having the particles (22) dispersed in the substance (32), the substance (32) having a viscosity for allowing the particles (22) to move in the substance (32), creating the pattern of disjunct portions (14) of the substance (32) in the layer (12) of the device (10), applying an external magnetic field (50) for substantially aligning the particles (22) in the disjunct portions (14) of the substance (32), and solidifying the substance (32) for obtaining the solid substance (24). The benefit of this method is that instead of changing the magnetization inside the particles (22), the particles (22) are moved, typically rotated, to be aligned to the externally applied magnetic field (50). Subsequent solidification of the substance (32) fixes the aligned magnetically stable particles (22) inside the solid substance (24) which results in a permanently magnetized magnetic material (18).
(FR) L'invention concerne un procédé de fabrication d'un dispositif (10) qui comprend une couche (12) pourvu d'un motif de parties de disjonction (14) de matériau magnétique (18) produisant un motif correspondant de champ magnétique local (2). Le matériau magnétique (18) est constitué de particules (22) dispersées dans une substance solide (24). Les particules sont magnétiquement stables et sensiblement alignées pour créer le champ magnétique local (2). Le procédé consiste à: fournir une substance (32) dans laquelle sont dispersées les particules (22), la substance (32) présentant une viscosité qui permet aux particules (22) de se déplacer dans la substance (32); créer le motif de parties de disjonction (14) de la substance (32) dans la couche (12) du dispositif (10); appliquer un champ magnétique externe (50) pour aligner sensiblement les particules (22) dans les parties de disjonction (14) de la substance (32); et enfin, solidifier la substance (32) pour obtenir la substance solide (24). L'avantage de ce procédé est qu'au lieu de modifier la magnétisation à l'intérieur des particules (22), les particules (22) sont déplacées, généralement entraînées en rotation, pour les aligner sur le champ magnétique appliqué extérieurement (50). La solidification ultérieure de la substance (32) fixe les particules alignées magnétiquement stables (22) à l'intérieur de la substance solide (24), ce qui permet d'obtenir un matériau magnétique (18) magnétisé en permanence.
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP1911023JP2009502004US20090195904CN101223585