US 7,680,024 B2 · Multilevel read-only optical disk and method for producing the same

Abstract

The present invention provides a multilevel read-only optical disk and the method for producing the same. The multilevel read-only optical disk comprises a plurality of the recording pits, each of the longitudinal sections of the recording pits has a multilevel arbitrary shape; the areas of the longitudinal sections of the recording pits are not identical each other; the area of each of the longitudinal sections of the recording pits is defined by the following formula: S=∫h(x)dx, where S represents the area of each of the longitudinal sections of the recording pits, x represents the coordinate value along the width direction of the recording pits, h(x) represents the pit-depth distribution function of the longitudinal sections of the recording pits and the region of the integration covers the whole longitudinal sections of the recording pits. Furthermore, the run length of the multilevel read-only optical disk is limited. The present invention obtains the advantage of both multilevel storage technology and run length limited (RLL) codes. They can improve prominently the storage capacity and data transfer rate of read-only optical disk without changing the wavelength of the laser and optical numerical aperture, and are most compatible with the conventional read-only optical disk system.

Claims26

Dependent claims

A multilevel read-only optical disk, wherein run lengths of the multilevel read-only optical disk are limited, the multilevel read-only optical disk comprising a plurality of recording pits that have longitudinal sections, each of said longitudinal sections having a multilevel arbitrary shape and an area that is defined by the following formula:

S=∫h(x)dx
where S represents said area of each of the longitudinal sections of the recording pits, x represents the coordinate value along the width direction of the recording pit, h(x) represents the pit-depth distribution function of the longitudinal sections of the recording pits, and the area of the integration covers the whole longitudinal sections of the recording pits.

A method for producing a multilevel read-only master disk, comprising the steps of:

a) generating recording signals for controlling recording of the multilevel read-only master disk by encoding binary user data with error correction codes and multilevel modulation codes;
and
b) modulating a laser output power with the recording signals, then recording on the multilevel read-only master disk, and finally forming the multilevel read-only master disk, wherein the multilevel master disk comprises a plurality of recording pits that have longitudinal sections, each of said longitudinal sections having a multilevel arbitrary shape and an area that is defined by the following formula:
S=∫h(x)dx
where S represents said area of each of the longitudinal sections of the recording pits, x represents the coordinate value along the width direction of the recording pits, h(x) represents the pit-depth distribution function of the longitudinal sections of the recording pits, and the area of the integration covers the whole longitudinal sections of the recording pits;
and
further wherein the multilevel modulation codes are multilevel run-length-limited modulation codes;
the multilevel codes sequences are multilevel run-length-limited modulation codes sequences;
and the multilevel master disk is a multilevel run-length-limited master disk.

6 more elements

A method for producing a multilevel read-only optical disk, comprising the steps of:

a) generating recording signals for controlling recording of a master disk by encoding binary user data with error correction and multilevel modulation;
b) modulating the laser output power with the recording signals, recording the master disk, and forming the multilevel master disk;
c) replicating a metallic stamper by using the multilevel master disk as a mould;
and
d) moulding the multilevel read-only optical disk with the metallic stamper, wherein the multilevel read-only optical disk comprises a plurality of the recording pits that have longitudinal sections, each of said longitudinal sections having a multilevel arbitrary shape and an area that is defined by the following formula:
S=∫h(x)dx
where S represents the area of each of the longitudinal sections of the recording pits, x represents the coordinate value along the width direction of the recording pits, h(x) represents the pit-depth distribution function of the longitudinal sections of the recording pits and the region of the integration covers the whole longitudinal sections of the recording pits;
and
further wherein the multilevel modulation codes are multilevel run-length-limited modulation codes;
the multilevel codes sequences are multilevel run-length-limited modulation codes sequences;
the multilevel read-only master disk is a multilevel run-length-limited master disk;
the multilevel read-only optical disk is a multilevel run-length-limited optical disk.

9 more elements

Dependencies are inferred from the claim text.

Multilevel read-only optical disk and method for producing the same

Life of this patent

Multilevel read-only optical disk and method for producing the same

Life of this patent

Abstract

Claims26