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Machine translation
1. (WO1982000067) APPARATUS AND METHOD FOR READING OPTICAL DISCS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1982/000067    International Application No.:    PCT/US1981/000626
Publication Date: 07.01.1982 International Filing Date: 12.05.1981
IPC:
G11B 7/00 (2006.01), G11B 7/005 (2006.01), G11B 7/13 (2012.01)
Applicants: EASTMAN KODAK COMPANY
Inventors:
Priority Data:
Title (EN) APPARATUS AND METHOD FOR READING OPTICAL DISCS
(FR) APPAREIL ET PROCEDE DE LECTURE DE DISQUES OPTIQUE
Abstract: front page image
(EN)Apparatus and method for reading optical discs (30) containing information in the form of tracks of high spacial-frequency, phasemodulating marks (34) (e.g., depressions or pits). The apparatus includes means (41) for directing the zero (Bo) and one of the first order beams or (B-1, B+1) of read light diffracted by a scanned track into superimposed relation on a photodetector (42, 42') and means (43, 43', 43'', 80) for predeterminedly attenuating the zero order beam light (Bo) so that its magnitude is more equal to that of the first order beam (B-1).
(FR)Appareil et procede de lecture de disques optiques (30) contenant des informations sous la forme de pistes de marques de modulation de phase a haute frequence spatiale (34) (p.ex. des depressions ou piqures). L'appareil comprend des moyens (41) pour diriger le rayon d'ordre zero (Bo) et l'un des rayons de premier ordre (B-1, B+1) de ligne de lecture diffractee par une piste exploree en relation de superposition sur un photodetecteur (42, 42'), et des moyens (43, 43', 43'', 80) pour attenuer de maniere predeterminee la lumiere du rayon d'ordre zero (Bo) de sorte que son intensite soit superieure ou egale a celle du rayon de premier ordre (B-1).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)