Optical device and optically recorded information recording/reading apparatus
AssigneePioneer Corporation
InventorsNaoharu Yanagawa, Masahiro Kato, Tatsuhiro Yone, Yuko Muramatsu, Shinji Suzuki
Life of this patent
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Abstract
An optically recorded information recording and/or reading apparatus which eliminates the influence of stray light occurring within an optical system. In a state or a focus state which is forcedly set to position a reading point outside the outermost periphery of a disk surface, and the signal level is adjusted in a signal combiner circuit such that a light receiving level at that time matches a desired level.
Claims4
An optical device including an optical system, a light receiver for receiving light from said optical system to generate light receiving signals, a level adjusting unit for adjusting signal levels of said light receiving signals, and controller for controlling said level adjusting unit,
- wherein said controller includes a calibrating unit for calibrating adjustment characteristics of said level adjusting unit in accordance with the magnitude of stray light occurring within said optical system.
An optically recorded information recording and/or reading apparatus including a light source, an optical system for relaying a light beam from said light source, an objective lens for converging the light beam through said optical system on a recording surface of an optical disk, a light receiver for receiving a return beam from said optical disk through its light receiving surface to generate light receiving signals, a carriage for carrying the light source, optical system and objective lens, a carriage servo system for positioning said carriage in a direction parallel with said recording surface, a focus servo system for positioning said objective lens in a direction perpendicular to said recording surface, a level adjusting unit for adjusting signal levels of said light receiving signals, a signal combining unit for combining the light receiving signals after passing through said level adjusting unit to generate a composite signal, and controller for controlling said carriage servo system, focus servo system and level adjusting unit, respectively,
- wherein said controller includes a calibrating unit for calibrating adjustment characteristics of said level adjusting unit in accordance with the magnitude of stray light occurring within said optical system.
Dependencies are inferred from the claim text.