Thermal bulk erasure method for dye polymer optical media

Details Thermal bulk erasure method for dye polymer optical media Thermal bulk erasure method for dye polymer optical media

1990-07-26

1992-09-01

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692752, G11B 700, G11B 730

Patent

active

051446138

ABSTRACT:
A method of achieving a bulk erasure of a dye polymer optical storage media which includes a substrate, an expansion layer, and a retention layer. The optical storage media is placed into a temperature controlled environment in which the temperature is increased at a first prescribed rate to a prescribed temperature exceeding the glass transition temperature of the retention layer of the media. Above the glass transition temperature, the retention layer is transformed from a glass-like state to a viscoelastic state. While in the viscoelastic state, the retention layer shape conforms to the expansion layer to achieve the unrecorded media configuration (i.e. flat). The temperature of the controlled environment is maintained at the prescribed temperature for a specified period of time to achieve the bulk erasure, then reduced at a second prescribed rate. By controlling the prescribed temperature and specified time period, the media is erased in bulk providing an unrecorded media ready for use. The prescribed temperature, specified time period and temperature change rates are selected to avoid thermal shock and polymer degradation and thus enable many record/erase transitions of the media.

REFERENCES:
patent: 4398203 (1983-08-01), Cornet
patent: 4430659 (1984-02-01), Maffitt et al.
patent: 4527173 (1985-07-01), Gupta et al.
patent: 4578788 (1986-03-01), Ahn et al.
patent: 4587533 (1986-05-01), Nakane et al.
patent: 4598395 (1986-07-01), Smith
patent: 4645712 (1987-02-01), Ishigaki et al.
patent: 4651172 (1987-03-01), Watanabe et al.
patent: 4673626 (1987-06-01), Takeda et al.
patent: 4680458 (1987-07-01), Drexler
patent: 4709363 (1987-11-01), Dirks et al.
patent: 4710452 (1987-12-01), Raychaudhuri
patent: 4719615 (1988-01-01), Feyrer et al.
patent: 4773059 (1988-09-01), Minemura et al.
patent: 4780867 (1988-10-01), Lind et al.
patent: 4798785 (1989-01-01), Pan et al.
patent: 4825430 (1989-04-01), Halter et al.
patent: 4852075 (1989-07-01), Feyrer et al.
patent: 4852077 (1989-07-01), Clark et al.
patent: 4855992 (1989-08-01), Ikegawa et al.
patent: 4879709 (1989-11-01), Clark
patent: 4896314 (1990-01-01), Skiens et al.
patent: 4970711 (1990-11-01), Martin et al.
patent: 4975358 (1990-12-01), Sonnenschein et al.
Miyaoka, "Digital Audio is Compact and Rugged," IEEE Spectrum (Mar. 1984) pp. 35-39.
Watkinson, The Art of Digital Audio, Chapter 13, pp. 440-486, Focal Press (1988).
Sales Materials, Indalloy (1989).
Hartman, et al., "Erasable Bilayer Dye-Polymer Optical Recording Medium".
Martin, et al., USSN 152, 696, field Feb. 05, 1988, entitled "Bulk Eraser for Optical Memory Media".
Hsieh, USSN 459,923, filed Jan. 02, 1990, entitled "System and Method for Erasing Light-Responsive Optical Disks".

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