Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1988-07-29
1991-01-01
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4413, G11B 700
Patent
active
049823981
ABSTRACT:
There are provided an optical disc and an optical recording apparatus to form a tracking groove onto an optically recordable disc. This apparatus comprises: a recording beam generator to generate a recording beam such as a laser beam having a predetermined spot size so as to form a pattern of a predetermined width onto the disc; a light deflector arranged on an optical path of the recording beam generator; and a driver for driving the light deflector for reciprocally moving the recording beam in a radial direction of the disc at a high frequency, and for multi-exposing the disc by the recording beam due to the movement of the recording beam in the radial direction, whereby a groove having a width wider than the pattern of the predetermined width is formed. With this apparatus, both the discrete information pattern and a groove are formed by using a single recording beam. Namely, both the pits and a wide groove can be formed by using a single recording spot.
REFERENCES:
patent: 4716560 (1987-12-01), Itonaga
Endoh Sohmei
Yamamoto Masanobu
McElheny Jr. Donald
Sony Corporation
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