Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-11-29
1997-12-23
Nelms, David C.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 94, 369124, 369 4426, G11B 700
Patent
active
057012881
ABSTRACT:
An object pickup device includes a light source, an object lens for concentrating light generated from the light source onto an optical disk, a photodetector for detecting a signal from the light reflected from the optical disk, a disk detecting portion for detecting the light quantity in a light spot concentrated on the optical disk by the object lens and for detecting the optical disk type, a focus offset calculating portion for calculating a focus offset corresponding to the detected disk type, a focus servo portion for performing a focus servo mechanism according to the signal calculated from the focus offset and the signals detected in the photodetector, and a light output optimizing means for optimizing the light output of the light source according to the calculated focus offset signal. Meanwhile, a controlling method of a light output in the optical pickup device includes a disk kind detecting step, a focus offset calculating step, a focus offset adjusting step, and a compensating a focus and track error step.
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Chu Kim-Kwok
Nelms David C.
Samsung Electronics Co,. Ltd.
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