Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1981-10-22
1985-05-21
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369111, G11B 724
Patent
active
045190640
ABSTRACT:
An optical record disc is provided having a guide signal pit previously formed on a base plate for reading out a tracking information by a laser beam. A reflection film is coated on the base plate including the guide signal pit portion, and the record blank portion. A record layer of a removing type is formed over the reflection film. The record layer has a uniform thickness over the record layer and a uniform thickness, of substantially smaller dimension over the guide signal pit portion.
REFERENCES:
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4097895 (1978-06-01), Spong
patent: 4230939 (1980-10-01), de Bont et al.
patent: 4270130 (1981-05-01), Houle et al.
patent: 4290075 (1981-09-01), Jacobs et al.
patent: 4326282 (1982-04-01), Verboom et al.
patent: 4336545 (1982-06-01), Howe et al.
patent: 4340655 (1982-07-01), Hollister et al.
Research Disclosure, Nov. 1978, pp. 38-41, "Medium for Recording by Thermal Deformation".
Hara Tsutomu
Kobayashi Yoshikazu
Suzuki Yoshiji
Takagi Toshihiko
McElheny Jr. Donald E.
Nippon Columbia Kabushikikaisha
Schaffer Murray
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