Optical pickup device

Details Optical pickup device Optical pickup device

2007-06-19

2007-06-19

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

10892382

ABSTRACT:
When an extra-high density optical disc, a DVD having a recording density lower than that of the extra-high density optical disc, a CD having a recording density lower than that of the DVD, and a combined optical recording medium in which the extra-high density optical disc, DVD, and CD are appropriately combined and integrally stacked are selectively recorded or reproduced by an objective lens whose numerical aperture (NA) is set to 0.75 or more, the objective lens satisfies the following expression:in-line-formulae description="In-line Formulae" end="lead"?t<a·f+bin-line-formulae description="In-line Formulae" end="tail"?wherein t: an axial thickness of the objective lens, f: a focal distance of the objective lens, a: a coefficient, and b: a constant, and the coefficient a and the constant b satisfies that a=2.02, b=−1.94; a=2.08, b=−1.84; or a=2.11, b=−1.77.

REFERENCES:
patent: 7120109 (2006-10-01), Kim et al.
Itonaga, M. et al. “Investigation of the General Design Principle of a Single Lens and the Development of a New NA=0.85 Single Lens”, Jpn. J. Appl. Phys., vol. 42 pp. 875-879, 2003.
Lee, M. et al. “Thoroughly dissecting techniques of a next generation optical disc (second one) How to produce a Blu-ray Disc”, Nikkei Electronics, vol 03/05/12 pp. 119-133, 2003. ABSTRACT.

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