Novel One-Beam Tracking Detection Method for Dual-Layer Blu-ray Discs

Sano, Kousei; Yamasaki, Fumitomo; Arai, Akihiro; Kadowaki, Shin-ichi

doi:10.1143/jjap.45.1174

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…To settle this issue, we adopted the advanced push-pull (APP) method, [23][24][25] and in addition, we newly designed the hologram and the photodetectors for our APP method, and placed them as shown in Fig. 4.…”

Section: Cancellation Of Tracking Offset By Newly Designedmentioning

confidence: 99%

Advanced Radial Position Control of a Recording Beam for Super Multilayer Disc with Separated Guide Layer

Tanaka

Takahashi

Ogasawara

et al. 2013

Jpn. J. Appl. Phys.

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We have developed an advanced radial position control system for a super multilayer disc with a separated guide layer to realize stable recording on the plane recording layers located far from the guide layer. The developed system consists of an advanced sled servo system and a specially designed optics based on the advanced push–pull method. Recorded signals on all recording layers were evaluated by using integrated-maximum likelihood sequence error estimation (i-MLSE) as the evaluation indicator. As a result, we confirmed sufficient recorded signal qualities and feasibility at the quad-speed continuous recording with a constant track pitch of 0.32 µm, the same as that of Blu-ray disc (BD). We believe that our proposed concept is the most practical solution for the next-generation optical disc system and our control system is essential to realize stable multilayer recording with a constant track pitch.

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Section: Cancellation Of Tracking Offset By Newly Designedmentioning

confidence: 99%

Advanced Radial Position Control of a Recording Beam for Super Multilayer Disc with Separated Guide Layer

Tanaka

Takahashi

Ogasawara

et al. 2013

Jpn. J. Appl. Phys.

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“…The BD objective lens is inevitably arranged in a position that deviates from the center line. A type of one-beam tracking method, Advanced-Push-Pull (APP), is suitable for dual-layer BDs [2] . It is also more robust against changes in track groove angle than the three-beam method.…”

Section: Construction Of the Opumentioning

confidence: 99%

Optical pickup for recording to dual-layer 2x-speed Blu-ray disc, DVD, and compact disc

et al. 2007

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An ordinary half-height size optical pickup with high light-use efficiency for Blu-ray Discs (BDs) has been realized. It has two objective lenses arranged tangentially. Although one of the objective lenses, BD objective lens, does not follow the line that passes thorough the center of the spindle motor, stable tracking-error detection has been achieved by enhancing a one-beam method. This pickup has a beam shaper which changes a divergent angle of light with high magnification. Although beam shapers are sensitive to a positional error, our pickup accomplished stable positioning by introducing a new structure.

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“…One solution to this problem is the adjacent track servo system with linear positioning method developed by Urakawa et al [19][20][21][22][23] However, the need to form a particular pit structure on the servo layer to maintain a continuous linear position on the groove-less disk could increase the disk fabrication cost. An alternative is the advanced radial position control system developed by Tanaka et al, [24][25][26][27][28] but its use of feed-forward control it is not sufficiently robust against shock and vibration. The advanced linking techniques reported by Usui et al 29) reduce disk capacity because a specific linking buffer region needs to be placed between previously recorded data marks and the currently recorded data marks.…”

Section: Introductionmentioning

confidence: 99%

Decoupled direct tracking control system based on use of a virtual track for multilayer disk with a separate guide layer

Tanaka

Ogata

Imagawa

2015

Jpn. J. Appl. Phys.

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We developed a decoupled direct tracking control system for multilayer optical disk that uses a separate guide layer. Data marks are recorded on a recording layer immediately above the guide layer by using two spatially separated spots with different wavelengths. Accurate data mark recording requires that the relative positions of the corresponding spots on the recording layer and guide layer are maintained. However, a disk tilt can shift their relative positions and cause previously recorded data marks to be overwritten. Additionally, a two-input/two-output control system is susceptible to mutual interference phenomenon between the two outputs, which can destabilize tracking control. A tracking control system based on use of data marks previously recorded as a virtual track has been developed that prevents spot shifting and mutual interference even if the disk tilt reaches 0.7°, thereby preventing overwriting.

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Novel One-Beam Tracking Detection Method for Dual-Layer Blu-ray Discs

Cited by 10 publications

References 2 publications

Advanced Radial Position Control of a Recording Beam for Super Multilayer Disc with Separated Guide Layer

Advanced Radial Position Control of a Recording Beam for Super Multilayer Disc with Separated Guide Layer

Optical pickup for recording to dual-layer 2x-speed Blu-ray disc, DVD, and compact disc

Decoupled direct tracking control system based on use of a virtual track for multilayer disk with a separate guide layer

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