US 6,603,730 B2Granted

Optical reproducing method

AssigneesHitachi, Ltd., Hitachi Maxell, Ltd.

InventorsHarukazu Miyamoto, Hirofumi Sukeda, Motoyasu Terao, Hiroyuki Minemura, Tetsuo Andou

Life of this patent

Estimating the term…

Loading patent…

Abstract

An optical reproducing method using an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction. The prepit portion includes first and second prepit portions divided in a track direction with a prepit of the respective first and second prepit portions being arranged on a boundary of the respective tracks. The first prepit portion has an address information prepit and a synchronous information prepit and the second prepit portion has a synchronous information prepit. A trailing edge of an end prepit of the first prepit portion is aligned in the radial direction. The method includes irradiating an optical spot on the optical recording medium, detecting a reflected beam from the optical recording medium, and reproducing information on the optical recording medium by using a signal obtained by the reflected beam.

Claims1

Dependent claims

An optical reproducing method using an optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radial direction;

wherein the prepit portion includes first and second prepit portions divided in a track direction;
wherein a prepit of the respective first and second prepit portions is arranged on a boundary of the respective tracks;
wherein the first prepit portion has an address information prepit and a synchronous information prepit;
wherein the second prepit portion has a synchronous information prepit;
wherein the prepit of the first prepit portion and the prepit of the second prepit portion are arranged with one track displaced in the radial direction;
and
wherein a trailing end of an edge prepit of the first prepit portion is aligned in the radial direction;
said method comprising the steps of:
irradiating an optical spot on said optical recording medium;
detecting a reflected beam from said optical recording medium;
and
reproducing information on said optical recording medium by using a signal obtained by the reflected beam.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/067,742Filed 8 Feb 2002 · continuation
Priority: JP 07-02494914 Feb 1995
Published: US 2002/0071369 A113 Jun 2002
Granted: 5 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G11B 7/24085
Tracks or pits; Shape, structure or physical properties thereof: pits
G11B 7/00718
Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped;…:…
G11B 7/00745
Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped;…:…
G11B 7/0938
With provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record…

Family

Application08/600,730Parent of this continuation-in-part · filed 13 Feb 1996
Application08/733,924Parent of this continuation · filed 18 Oct 1996
Application08/958,867Parent of this continuation · filed 27 Oct 1997
Application09/181,677Parent of this continuation · filed 29 Oct 1998
Application09/514,284Parent of this continuation · filed 28 Feb 2000
Application09/809,048Parent of this continuation · filed 16 Mar 2001
US 2002/0071369 A1Pre-grant publication · published 13 Jun 2002
US 6,392,985 B2Parent of this continuation
US 6,262,968 B1Parent of this continuation
US 6,064,644 AParent of this continuation
US 5,898,663 AParent of this continuation
US 5,982,738 AParent of this continuation
Application08/733,924Parent of this continuation-in-part
US 5,805,565 AParent of this continuation-in-part
US 2001/0010666 A1Published application
US 6,603,730 B2This patent

From the US filing history. Foreign family members aren’t listed.