Focus servo device

Details Focus servo device Focus servo device

2007-03-13

2007-03-13

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280

Reexamination Certificate

active

11145754

ABSTRACT:
A focus servo device is for focusing a light irradiated from a light source onto a recording medium surface via an objective lens. Assuming that a wavelength of the light is λ, a numerical aperture of the objective lens is NA, an average run length period of the recording medium standardized with λ/NA is RL, the track pitch standardized with λ/NA is TP, and the capture range of said focus servo device is CR [μm], the following equation applies:in-line-formulae description="In-line Formulae" end="lead"?0.114/(RL−0.72)+0.84≦CR≦18000(TP−0.69)5+3.13.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6567353 (2003-05-01), Kubo et al.
patent: 5-120698 (1993-05-01), None
patent: 8-147715 (1996-06-01), None
patent: 8-315370 (1996-11-01), None

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