US 5,508,087 A · Organic-optic recording tapes

Abstract

An organic-optic recording tape of higher capacity and higher packing density of data. This tape comprises a backcoating layer, a base film coated on the backcoating layer, and a complex functional layer for writing, reading and erasing data. The complex functional layer is coated on the base film and selectively focused by laser beams of different powers outputted from a laser diode in order to write, read or erase data. This complex functional layer is made of a block polymer prepared by blending a thermoplastic elastomer and a viscoelastic transparent thermoplastic high-molecular resin or polymerizing them. Near infrared absorbing organic colorants are dispersed in the complex functional layer. The transparent thermoplastic resin has a glass transition temperature higher than that of the elastomer. The recording is effected by employing a laser beam of lower power capable of inducing thermal expansion of the elastomer and formation of a bump. The erasing is effected by employing a laser beam of higher power capable of inducing viscousness of the resin. The reading is effected by employing a laser beam of very lower power capable of causing reflectivity difference between the bump and the normal part of the complex function layer.

Claims10

Dependent claims

An organic-optic recording tape, consisting essentially of:

a backcoating layer;
a base film coated on said backcoating layer;
and
a complex functional layer coated onto said base film;
said complex functional layer being a single polymeric layer formed of a thermoplastic elastomer and a viscoelastic transparent thermoplastic polymer, with near-infrared absorbing organic colorants dispersed therein, the colorants capable of generating heat from 110.degree.-120.degree. C. when subjected to infrared radiation;
wherein the thermoplastic elastomer has a melting point of at least 200.degree. C., a glass transition temperature of 0.degree. C. or less, and viscoelasticity in a temperature range from about room temperature to about data therefrom, and to rewrite data thereon upon selective heating by laser beams of different powers outputted from a single laser source;
wherein said complex functional layer generates a bump while recording data thereon and eliminates said bump while erasing said data.

4 more elements

Dependencies are inferred from the claim text.

Organic-optic recording tapes

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Organic-optic recording tapes

Life of this patent

Abstract

Claims10