Open AccessAnalysis of the focus error characteristic in high density optical disk driver
Author(s) -
Qin Shen,
Jing Pei,
Duanyi Xu,
Jianshe Ma,
Guo-Jun Qi,
Lihua Li
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.4132
Subject(s) - focus (optics) , optics , optical disc , scalar (mathematics) , enhanced data rates for gsm evolution , diffraction , luminous intensity , detector , physics , noise (video) , linearity , computer science , telecommunications , computer vision , mathematics , geometry , image (mathematics) , quantum mechanics
High density digital video disc (HD-DVD) is one of the high density optical data storage technologies to meet the demand of high definition TV. The knife-edge method for focus error detection in HD-DVD driver is proposed in this paper. The calculation model for optical intensity distribution on photo detector under different defocusing amount is deduced on the basis of Fresnel formula and scalar diffraction theory.The S curve obtained theoretically showing how the focus error intensity varies with defocusing amount is in agreement with the experimental one for HD-DVD driver,which validates the calculation model.Furthermore, the focusing noise caused by pit-modulation in HD-DVD driver is analyzed and indicated to be less than 4.5%. It is concluded that a satisfactory focus range of linearity is realized in HD-DVD driver with knife-edge method which has high sensitivity and low focusing noise.