IP Library › Granted Patent US 7,391,710
Granted Patent B2
US 7,391,710 · App. 11/439,337 · Granted Jun 24, 2008

Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing information

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Quick Facts
Patent No.
US 7,391,710
App. No.
11/439,337
Granted
Jun 24, 2008
Kind
B2
Abstract

A method for determining layers in a recording medium having a plurality of layers for the recording and reproduction of information using light irradiation. Each of the plurality of layers includes an emboss portion and a wobble region having wobbles of a predetermined frequency. Layer determination is carried out based on the ratio of the amplitude of a wobble signal obtained from the wobble region to the amplitude of a reproduction signal from the emboss portion.

Claims (9)

1. A method for determining layers in a recording medium having a plurality of layers for the recording and reproduction of information using light irradiation;

wherein each of said plurality of layers includes an emboss portion and a wobble region having wobbles of a predetermined frequency; and

wherein the method comprises the step of carrying out layer determination based on the ratio of the amplitude of a wobble signal obtained from said wobble region to the amplitude of a reproduction signal from said emboss portion.

2. A method for recording information on a recording medium having a plurality of layers by light irradiation, each of said plurality of layers including an emboss portion and a wobble region having wobbles of a predetermined frequency;

wherein a layer is identified based on the ratio of the amplitude of a wobble signal obtained from said wobble region to the amplitude of a reproducing signal from said emboss portion; and

wherein the method comprises the step of recording information on the identified layer.

3. A method for reproducing information from a recording medium having a plurality of layers by light irradiation, each of said plurality of layers including an emboss portion and a wobble region having wobbles of a predetermined frequency;

wherein a layer is identified based on the ratio of the amplitude of a wobble signal obtained from said wobble region to the amplitude of a reproduction signal from said emboss portion; and

wherein the method comprises the step of reproducing information from the identified layer.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 12, 2013
From: HITACHI, LTD.
To: HITACHI CONSUMER ELECTRONICS CO., LTD.
Reel/Frame 030802/0610 →