# US 8,148,046 B2 · Optical disk storage medium

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- Number: US 8,148,046 B2
- Document ID: US8148046B2
- Status: Granted
- Kind: B2
- Application number: 11/910,353
- Filed: 2006-03-30
- Published: 2009-04-02
- Granted: 2012-04-03
- Earliest claimed: 2005-03-30
- Assignees: Yamaha Corporation
- Inventors: Tamotsu Homma
- Web page: https://patentgrep.com/patent/US8148046B2

## CPC

- G11B 7/24094: Indication parts or information parts for identification
- G11B 7/0037: with discs
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

The surface of a transparent layer provided on the uppermost layer of the label side of an optical disk is subjected to pearskin finish. As a result, a light from a reflection layer is prevented from directly entering a user who has viewed an image on the label side, and an antiglare phenomenon is prevented from occurring. This configuration enables good viewing.

## Claims

### Claim 1

An optical disk with a label side comprising:
a substrate;
a reflection layer formed on the substrate;
an image formation layer formed on the reflection layer;
a transparent protective layer formed on the image formation layer, one side of the transparent protective layer having a pearskin finish with a structure that provides an antiglare effect against a reflection light from the reflection side,
wherein the one side of the transparent protective layer is a label side surface of the optical disk, and
wherein the optical disk further comprises a transparent cover layer formed on the transparent protective layer for reducing the antiglare effect of the pearskin finish.

### Claim 2 (depends on 1)

The optical disk according to claim 1, wherein the transparent cover layer is capable of being peeled from the transparent protective layer.

### Claim 3 (depends on 1)

The optical disk according to claim 1, wherein the size of embossment of the pearskin finish is 10 to 100 μm.

### Claim 4

An optical disk comprising:
a substrate;
a reflection layer formed on the substrate;
an image formation layer formed on the reflection layer; and
a transparent protective layer formed on the image formation layer,
wherein an image is formed on the image formation layer by making a part of the image information layer transparent with a laser beam applied through the transparent protective layer,
wherein one side of the transparent protective layer has a pearskin finish with a structure that provides an antiglare effect against a reflected light from the reflection side,
wherein the one side of the transparent protective layer is a label side surface of the optical disk, and
wherein the optical disk further comprises a transparent cover layer formed on the transparent protective layer for reducing the antiglare effect of the pearskin finish.

### Claim 5 (depends on 4)

The optical disk according to claim 4, wherein the transparent cover layer is capable of being peeled from the transparent protective layer.

### Claim 6

An optical disk comprising:
a substrate;
a reflection layer formed on the substrate;
an image formation layer formed on the reflection layer; and
a transparent protective layer formed on the image formation layer,
wherein an image is formed on the image formation layer by making a part of the image information layer transparent with a laser beam applied through the transparent protective layer,
wherein one side of the transparent protective layer has a pearskin finish with a structure that provides an antiglare effect against a reflected light from the reflection side,
wherein the size of embossment of the pearskin finish is 10 to 100 μm.