Optical writing and reading method and apparatus

Details Optical writing and reading method and apparatus Optical writing and reading method and apparatus

1986-09-19

1989-05-16

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369116, G11B 700

Patent

active

048316113

ABSTRACT:
An optical writing and reading method and apparatus for writing data on a recording medium. To prevent an over-writing of data, a mark is written to indicate that data is already written. Before writing data, a mark is written on a mark recording region. Simultaneously with the writing of the mark, the light quantity reflected from the mark recording region is detected. When the reflected light quantity indicates that data is already written, subsequent data writing is inhibited.

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patent: 4546462 (1985-10-01), Koishi et al.
patent: 4606016 (1986-08-01), Verboom et al.
patent: 4630252 (1986-12-01), Miura et al.
patent: 4631706 (1985-12-01), Batalden et al.
patent: 4695993 (1987-09-01), Takagi et al.

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