Title:
【発明の名称】光学的データ記録装置
Document Type and Number:
Japanese Patent JP2602493
Kind Code:
B2
Abstract:
@ An optical file system in which a command to store data results in a write operation in the next available storage position. A single optical path is used for both reading and writing. By dividing the detector (10) in two equal parts (10A, 10B) along the direction of relative movement, it is possible to determine whether data has been written at a position which is in advance of the center of the area viewed by the detector. The write operation is conditioned on the output of the first part of the detector. Since the first part of the detector gives advance warning on the status of the oncoming data position, it is possible to switch from reading to writing without the requirement for a wasted revolution or wasted space. By dividing the signal resulting from a change of reflectance sensed during a write operation by a measure of the intensity of the write laser a read signal free of the write modulation is obtained.
Inventors:
Glenn Darrell Bethalden
Deuan Willard Baxter
Nail Logicer Davy
Deuan Willard Baxter
Nail Logicer Davy
Application Number:
JP17778385A
Publication Date:
April 23, 1997
Filing Date:
August 14, 1985
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G11B7/00; G11B7/0045; G11B7/125; G11B7/13; G11B19/04; G11B27/36; (IPC1-7): G11B7/00; G11B7/125
Domestic Patent References:
| JP5823332A | ||||
| JP5922237A |
Attorney, Agent or Firm:
Kiyoshi Goda (2 outside)