Optical disk medium and tracking method

Details Optical disk medium and tracking method Optical disk medium and tracking method

2011-08-02

2011-08-02

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S275100

Reexamination Certificate

active

07990817

ABSTRACT:
A super-resolution material is formed in only a data pit, in a low temperature state of the super-resolution material, reflectivity of each of a pit portion and a space portion and an optical phase difference therebetween are set to be sufficiently small, in a high temperature state, and at least the optical phase difference between the pit and the space is set to be larger than the aforementioned value in an absolute value. Accordingly, by conducting irradiation with an appropriate read power by which substantially only one data track width can be heated to a high temperature state, a good push-pull signal can be obtained even with a track pitch being less than a diffraction limit. At the same time, by an optical device having functions such as a switching means with a DPP type, an offset correcting means of the push-pull signal due to lens shift, a shaping means of the push-pull signal, a learning means of read power, and the like, there is provided an optical disk device that corresponds to the optical disk medium of the present invention and achieves an increase in capacity.

REFERENCES:
patent: 7072251 (2006-07-01), Nakajima et al.
patent: 7426173 (2008-09-01), Maegawa
patent: 2005/0106508 (2005-05-01), Shintani et al.
patent: 2005/0276211 (2005-12-01), Hirotsune et al.
patent: 2006/0072434 (2006-04-01), Shintani et al.
patent: 2006/0262711 (2006-11-01), Shintani et al.
patent: 2006/0267211 (2006-11-01), Shintani et al.
patent: 2006/0275712 (2006-12-01), Anzai
patent: 2007/0009291 (2007-01-01), Anzai
patent: 2005-100526 (2005-04-01), None
patent: 2006-107588 (2006-04-01), None
U.S. Appl. No. 11/704,963, H. Minemura.
U.S. Appl. No. 11/705,021, H. Minemura.

Affiliated with

Also associated with

Rating

Optical disk medium and tracking method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical disk medium and tracking method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical disk medium and tracking method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2772292