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US 2010/0002566 A1Published application
Information recording medium, and method of manufacturing information recording medium
AssigneePioneer Corporation
InventorsAkira Shirota, Akira Shimizu, Tsuyoshi Hasebe, Masahiro Kato, Shoji Taniguchi, Atsushi Kondo, Yukihiro Sugawara, Masayoshi Yoshida
Life of this patent
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Abstract
An information recording medium (100) is an optical recording medium in which a groove is made along a recording track and record or reproduction is carried out by irradiating laser light to it and a push-pull signal, which is smaller than a prescribed value, is obtained from a part of a region (101a) of the groove.
Claims17
1-19. (canceled)
An information recording medium;
- which is an optical recording medium;
- in which a groove is formed along a recording track;
- and which is irradiated with a laser beam for recording or reproduction, wherein
- a push-pull signal less than a predetermined value, is obtained from at least a partial area of the groove;
- the predetermined value is equal to “0.22”;
- if the push-pull signal detected from the partial area, is normalized by an entire amount of light detected from the partial area.
3 more elements
A method of manufacturing an information recording medium;
- in which a groove is formed along a recording track;
- and which is irradiated with a laser beam for recording or reproduction;
- wherein a push-pull signal less than a predetermined value, is obtained from at least a partial area of the groove;
- the predetermined value is equal to “0.22”;
- if the push-pull signal detected from the partial area, is normalized by an entire amount of light detected from the partial area, said method comprising:
- a changing process of changing a depth or width of the groove in the partial area;
- and
- an adjusting process of adjusting the push-pull signal obtained from the changed partial area to be less than the predetermined value.
5 more elements
Dependencies are inferred from the claim text.