Optical information-recording medium and optical information...

Details Optical information-recording medium and optical information... Optical information-recording medium and optical information...

2006-09-05

2006-09-05

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S013350, C369S275200

Reexamination Certificate

active

07102990

ABSTRACT:
An optical information-recording medium comprises (a) a disk-shaped substrate having a first main surface and a second main surface opposite to the first main surface; an incidence surface of the medium being located to be nearer to the first main surface than the second main surface; (b) a recording layer formed on the substrate; and (c) a signal generation layer formed on the substrate in such a way as to be nearer to the incident surface than the recording layer. The signal generation layer allows an incident light beam irradiated to the incidence surface to pass through and allows a reflected light beam from the recording layer to pass through. The signal generation layer includes a transmittance changing region having a transmittance with respect to the incident light beam different from its neighborhood, thereby generating a repeated transmittance change according to rotation of the medium.

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K. Kayanuma et al., “High Track Density Magneto-Optical Recording Using a Crosstalk Canceler”, SPIE vol. 1316, Optical Data Storage, 1990, pp. 35-39.

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