US 7,406,014 B2 · Disc discriminating method and information reproducing apparatus using thereof

Abstract

The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.

Claims3

Dependent claims

A disc discriminating method, wherein DVD-RAM and DVD+RW are discriminated based upon a signal acquired from an optical disc, comprising:

a step for executing focus servo for DVD-RAM;
a step for executing tracking servo for DVD-RAM;
and
a step for determining that an optical disc is DVD-RAM based upon that a wobble signal acquired from the optical disc is a frequency for DVD-RAM and the optical disc is DVD+RW if the frequency is not for DVD-RAM.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/960,211Filed 6 Oct 2004 · continuation

Priority

JP 2001-11476713 Apr 2001

Published

US 2005/0047300 A13 Mar 2005

Granted

29 Jul 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G11B 19/12
Control of operating function, e.g. switching from recording to reproducing: by sensing distinguishing features of or on records, e.g. diameter…
G11B 7/0053
Reproducing: reproducing non-user data, e.g. wobbled address, prepits, BCA
G11B 7/0945
With provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record…
G11B 2007/0006
Recording, reproducing or erasing systems characterised by the structure or type of the carrier: adapted for scanning different types of carrier,…

Family

Application09/910,586Parent of this continuation · filed 20 Jul 2001

US 2005/0047300 A1Pre-grant publication · published 3 Mar 2005

US 6,822,936 B2Parent of this continuation

US 2002/0150017 A1Published application

US 7,406,014 B2This patent

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

Disc discriminating method and information reproducing apparatus using thereof

Life of this patent

Disc discriminating method and information reproducing apparatus using thereof

Life of this patent

Abstract

Claims3