Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-10-06
1989-10-17
Gonzalez, Frank
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369275, G11B 700
Patent
active
048752045
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to information storage and processing and, particularly, is concerned with methods of erasing information.
2. Description of the Prior Art
Known in the art is a method of erasing information in optical storage devices, wherein portions of an optical information carrier, on which information had been recorded, are exposed to a light beam so that they are reversibly converted into a state having initial optical properties. Such exposure of the optical carrier leads to changes in the degree of crystallization of the recording layer of the carrier, (FR, B, 2, 482 756).
This method is deficient in that it is too lengthy since the optical carrier has to be heated very slowly and the temperature has to be controlled precisely after heating. The method is not efficient and the reliability of repeated recordings is too low because recording and erasing cycles adversely affect the structure of the recording layer, its thickness becomes irregular.
Also known in the art is a method for erasing information recorded on an optical carrier having a recording layer, (U.S. Pat. No. 4 403 318) wherein the optical carrier is subjected to external exposure erasing recorded information, e.g. by heating. To this end, two or more light beams are produced, focused on the carrier, and scanned along the recording layer of the information carrier so that portions of this recording layer are heated differently. This is achieved by changing the density of the beam by changing the density of the beam by changing the radiation intensity or the size of the spot.
This method is deficient in that it cannot provide multiple use of the optical information carrier due to the reasons listed above.
SUMMARY OF THE INVENTION
The invention is to provide a method of erasing information, which permits multiple repeated recordings of information on the same optical information carrier after information has been erased from this carrier.
This is achieved by a method of erasing information recorded on an optical information carrier having a recording layer. According to the invention, the optical information carrier is equipped with an air-tight space and provided with a recording layer on the internal surface of said space, is filled with gas inert in relation to the material of the recording layer and to the material of the optical information carrier, said gas being under a pressure selected from a range from 10 kPa to 10.sup.3 kPa. The optical information carrier is heated, and, after the heating is over, the recording layer is regenerated.
This method of erasing information permits multiple use of the same optical information carrier and makes this optical carrier more mechanically strong.
An additional amount of material for the recording layer may be placed into the air-tight closed space of the optical information carrier in order to maintain a permanent thickness of the recording layer in the process of rewriting information, when the air-tight space is made as a cylinder and the recording layer is provided on the lateral surface thereof.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in more detail with reference to the accompanying drawing wherein an optical information carrier is shown as an embodiment realizing the method for erasing information, according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The method for erasing information recorded on an optical information carrier can be realized by the use of a specially designed carrier one embodiment of which is illustrated in the drawing.
An optical information carrier comprises a base which in this embodiment is a cylinder 1 made of a material transparent to laser-emitted light (the laser is not shown in the accompanying drawing), e.g. of glass. But, it should be pointed out that the claimed method can be realized by an optical information carrier equipped with a base made, for example, of two coaxial disks, or any other similar construction.
The cylinder 1 is hollow an
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Antonov Alexandr A.
Gorshkov Nikolai V.
Krjuchin Andrei A.
Petrov Vyacheslav V.
Shanoilo Semen M.
Gonzalez Frank
Institut Problem Modelirovania V Energetike Akademii Nauk Ukrain
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