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Title:
【発明の名称】光学的に読取り可能な記録キャリヤ
Document Type and Number:
Japanese Patent JP2697829
Kind Code:
B2
Abstract:
A record carrier (40) comprises a radiation-sensitive layer (43) upon a disc-shaped substrate (42) and is provided with an information-recording area arranged in accordance with a spiral-shaped or concentric pattern of preformed tracks (41). The track exhibits a track modulation in the form of a radial wobble whose frequency is modulated with a position-information signal (Ip). Further, an apparatus (1) is disclosed for forming the track pattern during the manufacture of the record carrier (40). When an information signal (Vi) is recorded on the record carrier (40) and the recorded signal is read an FM demodulation device (60) recovers the position-information signal Ip from the variations in the scanning beam (54, 54a) produced by the track modulation. Moreover, a clock signal for the purpose of scanning-velocity control is recovered from these variations in the scanning beam.

Inventors:
Wilhelms Petras Maria Raya McAlls
Francis Cass Lambertus Johannes Maria Quapelus
Arteie Willemina Fenis
Johannes Hermanus Theodorus Passman
Hendricks Antonius Maria Murder
Application Number:
JP25082187A
Publication Date:
January 14, 1998
Filing Date:
October 06, 1987
Export Citation:
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Assignee:
Philips Electronics Nemrose Fennaught Shap
International Classes:
G11B7/00; G11B7/004; G11B7/0045; G11B7/007; G11B7/013; G11B7/24079; G11B7/24082; G11B7/26; G11B23/00; G11B27/19; G11B27/24; G11B27/30; (IPC1-7): G11B7/00; G11B7/007; G11B7/24; G11B7/26
Domestic Patent References:
JP6022738A
JP5855569B2
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)