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Pub. No.:    WO/1999/040576    International Application No.:    PCT/JP1999/000450
Publication Date: 12.08.1999 International Filing Date: 03.02.1999
G11B 7/007 (2006.01), G11B 7/085 (2006.01), G11B 7/09 (2006.01), G11B 11/105 (2006.01)
Applicants: SANYO ELECTRIC CO., LTD. [JP/JP]; 5-5, Keihanhondori 2-chome Moriguchi-shi Osaka 570-8677 (JP) (For All Designated States Except US).
ASANO, Kenji [JP/JP]; (JP) (For US Only)
Inventors: ASANO, Kenji; (JP)
Agent: FUKAMI, Hisao; Sumitomo Bank Minamimori-machi Building 1-29, Minamimori-machi 2-chome Kita-ku, Osaka-shi Osaka 530-0054 (JP)
Priority Data:
10/25800 06.02.1998 JP
Abstract: front page image
(EN)An optical head (11) has sensors (61, 62) spaced in the track direction (10) so as to sense discontinuous grooves (4) formed in a land (2) at regular intervals or discontinuous lands (5) formed in a groove (3) at regular intervals and judges whether the track being scanned is the land (2) or groove (3) based on the differential signal (DF). After a track jump, tracking servo control of an objective (113) is started according to an identification signal (LG) from an identification circuit (16).
(FR)Tête optique (11) comportant des capteurs (61, 62), séparés dans le sens de la lecture (10), qui détectent les sillons discontinus (4) formés dans un intersillon (2) à intervalles réguliers ou les intersillons discontinus (5) formés dans un sillon (3) à intervalles réguliers, et qui estime si la piste balayée est l'intersillon (2) ou le sillon (3) sur la base du signal différentiel (DF). Après un saut de piste, la servocommande de lecture d'un objectif (113) est lancée en fonction d'un signal d'identification (LG) émis par un circuit d'identification (16).
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)