Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1985-05-17
1987-12-29
McElheny, Jr., Donald
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 44, G11B 724
Patent
active
047165600
ABSTRACT:
A recording disc comprises a substrate having a tracking servo groove of spiral or concentric pattern on one surface thereof. The servo groove has a constant depth and a variable width which varies to allow generation of a position indicating signal. An eraseable recording layer is deposited on the surface of the substrate to store information signals. The recording disc is fabricated by a method involving modulating the intensity of a laser beam with a permanently stored signal and directing it to the surface of a photoresist layer on a master blank placed on a rotating turntable. The beam penetrates the full thickness of the layer. The optically excited portion of the layer spreads in lateral directions by an amount proportional to the energy. The turntable is moved relative to the laser to expose a portion of the photoresist layer in spiral or concentric pattern to the directed beam. The exposed portion is then etched to form the tracking servo groove. A replica of the groove is then form on a substrate followed by the deposition of a radiation sensitive layer on the substrate.
REFERENCES:
patent: 3909517 (1975-09-01), Clemens
patent: 4359750 (1982-11-01), Howe
patent: 4428075 (1984-01-01), Hazel et al.
McElheny Jr. Donald
Victor Company of Japan Ltd.
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