Title:
【発明の名称】光情報担体、光情報担体の読出し方法及び装置
Document Type and Number:
Japanese Patent JP2807224
Kind Code:
B2
Abstract:
The recording surface of an optical record carrier (1) is divided into first (A) and second annular zones (B) which are situated concentrically around a centre of rotation (4). The annular zones (A) are provided with groups of radially aligned first control structures (13), whilst the annular zones (B) are provided with groups of radially aligned second control structures (14). An optical scanning device for optically scanning the structure of the information carrier (1) at the location of the scanning spot (54) projected on the record carrier by the scanning device comprises a detection circuit (70) which in the case of a radial movement of the scanning spot (54) detects first and second control structures (13; 14) and derives a measurement signal Vm which indicates the passage of the boundaries between the zones A and B during a radial movement of the scanning spot 54. The measurement signal Vm is very suitable for the control of a system for rapidly addressing the scanning spot 54 to one of the annular zones (A; B).
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Inventors:
YOHANESU YAKOBUSU FUERUBUUMU
Application Number:
JP8896187A
Publication Date:
October 08, 1998
Filing Date:
April 13, 1987
Export Citation:
Assignee:
OPUCHIKARU SUTORAGE INTERN HORANDO
International Classes:
G11B7/00; G11B7/004; G11B7/007; G11B7/013; G11B7/085; G11B7/24; G11B21/08; (IPC1-7): G11B7/007; G11B21/08
Domestic Patent References:
| JP51146803A | ||||
| JP5373119A |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)