Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Patent
1988-08-12
1991-07-23
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
369100, 369111, G11B 700, G01D 1510
Patent
active
050349430
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to computers and, in particular, to information storage devices.
2. Description of the Related Art
Known in the art is an information storage device comprising a cylindrical information carrier with a recording layer applied thereon and a mirror disposed inside said carrier (JP, B, 53-2694).
Information can be recorded on this cylindrical information carrier and read therefrom by a laser beam using the mirror located inside the carrier.
The disadvantage of this prior art storage device consists in its low volume density of data recording, which can be explained by that, first, only one recording layer is used, second, this recording layer is left unprotected against environmental effects, and, third, the diameter of the cylindrical information carrier is relatively large since its positioning device is arranged inside said carrier.
Also known in the art is an information storage device wherein an optical information carrier comprises a hollow cylinder, a recording layer applied onto the external surface of this hollow cylinder, and a second cylinder external to the first cylinder and transparent to laser radiation. Two annular sealing elements are arranged between the cylinders so that a cylindrical closed space is formed between them and adjacent to the recording layer of the hollow cylinder (GB, B, 1580398).
The two cylinders are not permanently connected since the material of the recording layer requires development after information has been recorded thereon and, consequently, access to the material of this recording layer has to be provided by separating the two cylinders.
Another disadvantage of this prior art storage device is its low storage volume density since only one recording layer is used and this recording layer is not protected from the environment in any way and, consequently, can be covered by dirt, which affects the storage surface density of the recording layer.
SUMMARY OF THE INVENTION
The present invention is to provide an information storage device wherein the number of information carriers is increased without seriously changing the geometrical dimensions thereof in order to achieve a higher information storage volume density.
This is achieved by an information storage device equipped with a container where a first optical information carrier is rotatably arranged, this first optical information carrier having a hollow cylindrical base with a recording layer applied thereon and made of a material transparent to laser radiation. According to the invention, the device is also provided with at least one optical information carrier which is made identically to and mounted coaxially with said first optical information carrier so that they can rotate individually in relation to each other.
It is advisable that the container should be hermetically sealed in order to make the gap between cylindrical bases of coaxially arranged optical information carriers as close as possible.
Each optical information carrier should advisably be provided with a locking device preventing its rotation when the other optical carrier rotates.
It is advisable that the locking device of each optical information carrier should be provided with a pin secured in the butt end of the container to interact with a respective hole made in the blank flange available in the butt end of each cylindrical base, or should comprise a ring element made of a magnetic material and secured on the butt end of a respective cylindrical base, and a ring-shaped magnet for each ring element, which is secured in the nearest butt end of the container.
It is desirable that, in order to ensure individual rotation of each optical information carrier, each said optical information carrier should be equipped with an electric rotational drive having its rotor secured on the butt end of a respective cylindrical base, the one opposite to the butt end where the locking device is installed, and its stator disposed on the container, said stator being common for all elect
REFERENCES:
patent: 4074282 (1978-02-01), Balas, Jr. et al.
patent: 4535434 (1985-08-01), Kishi
patent: 4542495 (1985-09-01), Zieger et al.
patent: 4566087 (1986-01-01), Kraft
Antonov Alexandr A.
Petrov Vyacheslav V.
duBois Steven M.
Institut Problem Modelirovania V Energetike Akademii Nauk Ukrain
Levy Stuart S.
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