Analysis of focusing error signals by differential astigmatic method under off-center tracking in the land-groove-type optical disk

Autor:	Masahisa Shinoda, Hidehiko Nakatani
Rok vydání:	2015
Předmět:	Physics business.industry Physics::Optics Radius Tracking (particle physics) Signal Atomic and Molecular Physics and Optics law.invention Lens (optics) Optics law DVD-RAM Sensitivity (control systems) business Optical disc Groove (music)
Zdroj:	Optical Review. 22:264-270
ISSN:	1349-9432 1340-6000
DOI:	10.1007/s10043-015-0037-1
Popis:	We theoretically calculate the behavior of the focusing error signal in the land-groove-type optical disk when the objective lens traverses on out of the radius of the optical disk. The differential astigmatic method is employed instead of the conventional astigmatic method for generating the focusing error signals. The signal behaviors are compared and analyzed in terms of the gain difference of the slope sensitivity of the focusing error signals from the land and the groove. In our calculation, the format of digital versatile disc-random access memory (DVD-RAM) is adopted as the land-groove-type optical disk model, and advantageous conditions for suppressing the gain difference are investigated. The calculation method and results described in this paper will be reflected in the next generation land-groove-type optical disks.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::92094f7b696c7ff9a934976b17f67ebd https://doi.org/10.1007/s10043-015-0037-1 Zobrazit plný text záznamu Full text from SpringerLink