Spherical aberration correcting method and apparatus
First Claim
1. A spherical aberration correcting apparatus comprising:
- a recording unit configured to record a piece of information through radiation of an optical beam onto an optical disk;
a reflected-light level detecting unit configured to detect a level of light formed of the optical beam reflected from the optical disk under a recording operation for the information;
a correction amount deciding unit configured to decide a correction amount for spherical aberration on the basis of the level of the reflected-light; and
a spherical aberration correcting unit configured to correct the spherical aberration by using the correction amount.
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Abstract
A spherical aberration correcting apparatus is incorporated in an information recording system and gives the system a function of correcting spherical aberration in a real-time and effective manner under a recording operation of pieces of information. The spherical aberration correcting apparatus comprises a recording unit, reflected-light level detecting unit, correction amount deciding unit, and spherical aberration correcting unit. The recording unit records a piece of information through radiation of an optical beam onto an optical disk. The detecting unit detects a level of light formed of the optical beam reflected from the optical disk under a recording operation for the information, while the deciding unit decides a correction amount for spherical aberration on the basis of the level of the reflected-light. The correcting unit corrects the spherical aberration by using the correction amount.
33 Citations
7 Claims
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1. A spherical aberration correcting apparatus comprising:
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a recording unit configured to record a piece of information through radiation of an optical beam onto an optical disk;
a reflected-light level detecting unit configured to detect a level of light formed of the optical beam reflected from the optical disk under a recording operation for the information;
a correction amount deciding unit configured to decide a correction amount for spherical aberration on the basis of the level of the reflected-light; and
a spherical aberration correcting unit configured to correct the spherical aberration by using the correction amount. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A spherical aberration correcting method comprising the steps of:
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recording a piece of information through radiation of an optical beam onto an optical disk;
detecting a level of light formed of the optical beam reflected from the optical disk under a recording operation for the information;
deciding a correction amount for spherical aberration on the basis of the level of the reflected-light; and
correcting the spherical aberration by using the correction amount, wherein the recording step is continued until the recording operation for the information is instructed to stop, during which time the light level detecting step, the correction amount deciding amount, and the spherical aberration correcting step are repeatedly performed in sequence.
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Specification