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US 6,324,155 B1Granted
Optical information recording medium with flat reflecting film and reading system for reading information recorded thereon
AssigneePioneer Electronic Corporation
InventorTakanori Maeda
Life of this patent
Estimating the term…
Abstract
A recording layer formed between a first substrate and a second substrate. The recording layer has recording surfaces on both sides thereof. A reflecting film is formed on an outside surface of the first substrate. The first and second substrates adjacent the recording layer have different refractive indexes from each other.
Claims30
An optical medium comprising:
- a transparent first substrate;
- a transparent recording layer formed over the first substrate having first and second recording surfaces on sides thereof, the first and second recording surfaces each including grooves and lands that define recorded information;
- wherein the recording layer only has a single refractive index;
- a transparent second substrate formed over the recording layer;
- and
- only a single flat reflecting film formed on an outside surface of the first substrate.
3 more elements
An optical medium comprising:
- a transparent first substrate having a first refractive index;
- a recording layer formed over the first substrate and having a first recording area at an interface between the first substrate and the recording layer;
- wherein the recording layer only has a single refractive index that is different than the first refractive index;
- a transparent second substrate formed over the recording layer and having a second recording area at an interface between the second substrate and the recording layer;
- wherein the second substrate has a second refractive index different than the single refractive index of the recording layer;
- and
- only a single flat reflecting film formed on an outside surface of the first substrate.
4 more elements
An optical medium comprising:
- a transparent first substrate;
- only a single flat reflecting film on a first side of the first substrate;
- a recording layer formed directly on a second side of the first substrate and having a first recording surface at a boundary between the first substrate and the recording layer;
- and
- a transparent second substrate formed directly on the recording layer and having a second recording surface at a boundary between the recording layer and the second substrate;
- and
- wherein the reflective film reflects input light through an interface between the recording layer and a substrate so as to interfere with output light reflected from the interface to increase contrast of the output light when the recorded optical data is read.
4 more elements
An optical recording medium comprising:
- a flat reflective film;
- a transparent first layer positioned over the reflective layer having only a first refractive index, wherein the first layer has at least one surface with grooves and lands;
- a transparent second layer positioned over the reflective layer having only a second refractive index that is different from the first refractive index, wherein the second layer has at least one surface with grooves and lands;
- a first set of recorded surfaces having various lengths between lands in a layer and a second set of recorded surfaces having various lengths between grooves in another layer, wherein a combination of the first set of recorded surfaces and the second set of recorded surfaces represent optical data within the optical recording medium;
- and
- wherein the reflective film reflects light through an interface between two recorded surfaces of different layers so as to interfere with light reflected from the interface so as to increase contrast of output light when the optical data is read.
3 more elements
Dependencies are inferred from the claim text.