Write-once-read-many optical disk having low-to-high recording property accommodating short wavelength recording
First Claim
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1. An optical recording medium exhibiting a Low-to-High recording property consisting essentially of:
- a substrate, an organic material layer, a heat insulating layer, a reflection layer, and a cover layer;
wherein the organic material layer is provided on the substrate and has a thickness of 50 nm to 300 nm, and has a light absorption function that is sufficient for recording in the recording/reproduction wavelength range;
wherein the reflection layer is provided on the organic material layer and has a thickness of from 50 nm to 300 nm; and
wherein the heat insulating layer is provided between the organic material layer and the reflection layer and has a thickness of from 5 nm to 200 nm;
wherein an unrecorded part of the optical recording medium is configured to exhibit a reflectivity that is lower than a reflectivity of a recorded part of the optical recording medium and wherein the recording/reproduction characteristics are obtained in a blue laser wavelength range operating at a wavelength range of no more than 500 nm;
wherein the light absorption function of the organic material layer is provided solely by a material consisting of a single organic material having;
a first absorption band situated toward a long wavelength side with respect to the recording/reproduction wavelength range,a second absorption band that does not belong to the first absorption band, the second absorption band situated in the vicinity of the recording/reproduction wavelength range, anda third absorption band situated toward a short wavelength side with respect to the recording/reproduction wavelength range, the third absorption band exhibiting an absorption greater than an absorption of the first absorption band, wherein the third absorption band has a largest absorption wavelength that is no greater than 300 nm,wherein the optical recording medium provides low-to-high recording at a recording power range of from 2 mW to 11 mW at a linear recording speed of 6 m/sec.
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Abstract
A write-only-read-many type optical recording medium includes a substrate, an organic material layer having a light absorption function that is sufficient for recording in the recording/reproduction wavelength range, the organic material layer being situated on the substrate, and a reflection layer being situated on the organic material layer. The recording medium is configured to have a Low-to-High recording property and record with a laser having a wavelength that is no greater than 500 nm.
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Citations
12 Claims
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1. An optical recording medium exhibiting a Low-to-High recording property consisting essentially of:
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a substrate, an organic material layer, a heat insulating layer, a reflection layer, and a cover layer; wherein the organic material layer is provided on the substrate and has a thickness of 50 nm to 300 nm, and has a light absorption function that is sufficient for recording in the recording/reproduction wavelength range; wherein the reflection layer is provided on the organic material layer and has a thickness of from 50 nm to 300 nm; and wherein the heat insulating layer is provided between the organic material layer and the reflection layer and has a thickness of from 5 nm to 200 nm; wherein an unrecorded part of the optical recording medium is configured to exhibit a reflectivity that is lower than a reflectivity of a recorded part of the optical recording medium and wherein the recording/reproduction characteristics are obtained in a blue laser wavelength range operating at a wavelength range of no more than 500 nm; wherein the light absorption function of the organic material layer is provided solely by a material consisting of a single organic material having; a first absorption band situated toward a long wavelength side with respect to the recording/reproduction wavelength range, a second absorption band that does not belong to the first absorption band, the second absorption band situated in the vicinity of the recording/reproduction wavelength range, and a third absorption band situated toward a short wavelength side with respect to the recording/reproduction wavelength range, the third absorption band exhibiting an absorption greater than an absorption of the first absorption band, wherein the third absorption band has a largest absorption wavelength that is no greater than 300 nm, wherein the optical recording medium provides low-to-high recording at a recording power range of from 2 mW to 11 mW at a linear recording speed of 6 m/sec. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical recording medium exhibiting a Low-to-High recording property consisting essentially of:
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a substrate, a reflection layer, an organic material layer, a light absorption layer, and a cover layer; wherein the organic material layer is situated on the substrate and has a thickness of 50 nm to 300 nm, the organic material layer having a light absorption function that is sufficient for recording in a recording/reproduction wavelength range of no more than 500 nm; wherein the light absorption layer is situated adjacent to the organic material layer and has a thickness of 5 nm to 150 nm; wherein the reflection layer is provided on the organic material layer and has a thickness of from 50 nm to 300 nm; and wherein the organic material satisfies a relation of (light absorption function of organic material layer in recording/reproduction wavelength area)<
(light absorption function of light absorption layer in recording/reproduction wavelength area);wherein an unrecorded part of the optical recording medium is configured to exhibit a reflectivity that is lower than a reflectivity of a recorded part of the optical recording medium; wherein the light absorption function of the organic material layer is provided solely by a material consisting of a single organic material having; a first absorption band situated toward a long wavelength side with respect to the recording/reproduction wavelength range, a second absorption band that does not belong to the first absorption band, the second absorption band situated in the vicinity of the recording/reproduction wavelength range, and a third absorption band situated toward a short wavelength side with respect to the recording/reproduction wavelength range, the third absorption band exhibiting an absorption greater than an absorption of the first absorption band, wherein the third absorption band has a largest absorption wavelength that is no greater than 300 nm, wherein the optical recording medium provides low-to-high recording at a recording power range of from 2 mW to 11 mW at a linear recording speed of 6 m/sec. - View Dependent Claims (10, 11, 12)
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Specification