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US 5,903,531 AGranted
Reproduction device for optical disks
AssigneeKabushiki Kaisha Toshiba
InventorsHiroharu Satoh, Hisashi Yamada, Junichi Uota
Life of this patent
Estimating the term…
Abstract
Signal processing systems can be switched according to the optical system selected from a plurality of optical systems and set to the operating state. A system controlling portion 100 finally sets an appropriate optical system according to the kind of an optical disk 11, and sets an appropriate signal processing system corresponding to the set optical system for setting an appropriate mode depending upon CD (compact disk) or DVD (high density recording disk).
Claims10
An optical disk reproduction device comprising:
- a light pick-up device including a plurality of optical systems having different beam spot sizes or different wavelengths;
- means for arranging one of the plurality of optical systems to face the optical disk;
- means for detecting reflected light from a beam radiated to the disk;
- a focus adjusting mechanism and a tracking adjusting mechanism;
- signal processing means for switching processing characteristics according to the kind of disk, and for reproducing signals recorded on the disk by using detected signals detected by the detecting means;
- focus servo means for switching characteristics according to the kind of disk, for generating focus error signals using the detected signals and providing feedback to the focus adjusting mechanism;
- tracking servo means for switching characteristics according to the kind of disk, for generating tracking error signals using the detected signals and providing feedback to the tracking adjusting mechanism;
- system controlling means, including an optical setting system, for optionally selecting an optical system suitable for a certain disk from the plurality of optical system;
- system setting means for switching processing characteristics and servo characteristics of the signal processing means, focus servo means, and tracking servo means so as to correspond to the certain disk;
- and
- means for distinguishing the disk type inserted into the optical reproduction device,
- said system controlling means comprising means for confirming whether the judged kind of disk is the same as the kind of disk designated by operation input information when the type distinguishing means determines the kind of disk and means for displaying a warning sign when a discrepancy exists.
9 more elements
An optical disk reproduction device comprising:
- a light pick-up device including a plurality of optical systems having different beam spot sizes or different wavelengths;
- means for arranging one of the plurality of optical systems to face the optical disk;
- means for detecting reflected light from a beam radiated to the disk;
- a focus adjusting mechanism and a tracking adjusting mechanism;
- signal processing means for switching processing characteristics according to the kind of disk, and for reproducing signals recorded on the disk by using detected signals detected by the detecting means;
- focus servo means for switching characteristics according to the kind of disk, for generating focus error signals using the detected signals and providing feedback to the focus adjusting mechanism;
- tracking servo means for switching characteristics according to the kind of disk, for generating tracking error signals using the detected signals and providing feedback to the tracking adjusting mechanism;
- system controlling means, including an optical setting system, for optionally selecting an optical system suitable for a certain disk from the plurality of optical system;
- system setting means for switching processing characteristics and servo characteristics of the signal processing means, focus servo means, and tracking servo means so as to correspond to the certain disk;
- and
- means for distinguishing the disk type inserted into the optical reproduction device,
- said system controlling means comprising:
- means for displaying a warning signal when the error of a reproduced signal in the signal processing means is more than a certain amount;
- and
- means for implementing reproduction until the user changes the designation of the kind of disk to have the error smaller than the certain amount with the optical system setting system and a system setting means established reproduction state corresponding to the disk designated by the user on the kind of disk by the designating operation.
12 more elements
An optical disk reproduction device comprising:
- light pick-up device including a plurality of optical systems having different beam spot sizes or different wavelengths;
- switching means for arranging one of the plurality of optical systems to face the optical disk;
- means for detecting a reflected light from a beam radiated to the disk;
- a focus adjusting mechanism, and a tracking adjusting mechanism;
- signal processing means for switching processing characteristics according to the kind of disk, and for reproducing signals recorded on the disk by using detected signals detected by the detecting means;
- focus servo means for switching characteristics according to the kind of disk, for generating focus error signals by using the detected signals and for providing feedback to the focus adjusting mechanism;
- tracking servo means for switching characteristics according to the kind of disk, for generating tracking error signals by using the detected signals and for providing feedback to the tracking adjusting mechanism;
- optical system setting means for selecting an optional optical system suitable for an optional disk as the optical system to be used among the plurality of optical system according to the designation input information on the kind of disk;
- system setting means for switching processing characteristics and servo characteristics of the signal processing portion, the focus servo means and the tracking servo means corresponding to the optional disk when the optical system setting means selects the optional optical system;
- disk setting mode switching means for changing the designation of the kind of disk when the error of the reproduced signal at the signal processing portion is more than a certain amount;
- and
- means for implementing reproduction operation when the error of the reproduced signal at the signal processing portion is smaller than the certain amount.
9 more elements
Dependencies are inferred from the claim text.