Optical recording medium processing device and focal point...

Details Optical recording medium processing device and focal point... Optical recording medium processing device and focal point...

2006-10-24

2006-10-24

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

C369S044250, C369S044260

Reexamination Certificate

active

07126899

ABSTRACT:
The focus is moved from a first layer (L0) to a second layer (L1) of a double-layered optical disk by stopping a control loop operation and applying acceleration pulses for an interlayer jump to a two-axis electromagnetic actuator. Here, switching timing between acceleration and deceleration for an interlayer jump is generated based on the rate of change of a SUM signal obtained from a light-sensitive element (27), the SUM signal is distinguished by a specific threshold TH, and an S-shaped error signal is distinguished by thresholds THH and THL with different positive
egative level, thereby performing a pull-in operation of focus control. In addition, at the time of the interlayer jump, a liquid crystal element (23) for correcting the spherical aberration is optimized in advance for the cover layer thickness of the target layer L1.

REFERENCES:
patent: 6480444 (2002-11-01), Tada et al.
patent: 6584048 (2003-06-01), Tateishi et al.
patent: 6777657 (2004-08-01), Nishio et al.
patent: 5-109085 (1993-04-01), None
patent: 2002-157750 (2002-05-01), None

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