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Analysis of the focus error characteristic in high density optical disk driver

Shen Quan-Hong Pei Jing Xu Duan-Yi Ma Jian-She Qi Guo-Sheng Li Li-Hua

Analysis of the focus error characteristic in high density optical disk driver

Shen Quan-Hong, Pei Jing, Xu Duan-Yi, Ma Jian-She, Qi Guo-Sheng, Li Li-Hua
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  • Abstract views:  3469
  • PDF Downloads:  1947
  • Cited By: 0
Publishing process
  • Received Date:  22 December 2005
  • Accepted Date:  13 February 2006
  • Published Online:  05 April 2006

Analysis of the focus error characteristic in high density optical disk driver

  • 1. 清华大学精密仪器与机械学系,光盘国家工程研究中心,北京 100084

Abstract: 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.

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