Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-07-04
2006-07-04
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053350
Reexamination Certificate
active
07072252
ABSTRACT:
The present invention provides a low-cost optical recording device that determines an optimum quantity of light for recording and reproducing, and an optimum focus offset value. The present invention also relates to a method of determining such an optimum focus offset value. The optical recording device is equipped with a focus control system for performing a focus control operation to focus light from a light source onto a recording face of an optical recording medium. This optical recording device includes: a focus offset value setting unit for sequentially setting a plurality of offset values for the focus control system; an adder unit for using each focus offset value to adjust the focus control system; a light quantity setting unit for sequentially setting a quantity of recording light emitted from the light source at a plurality of predetermined values; a recording unit for recording information on the optical recording medium; an error rate measuring unit for measuring an error rate in the information reproduced from the optical recording medium; and an optimum focus offset value determining unit for determining an optimum focus offset value based on the measured error rate.
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Ikeda Toru
Masaki Takashi
Agustin Peter Vincent
Greer Burns & Crain Ltd
Miller Brian E.
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