Method and apparatus of determining a type of disc
AssigneeSamsung Electronics Co., Ltd.
InventorsByoung-ho Choi, Yong-seock Yoon, Soo-yul Jung, Joong-eon Seo
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Abstract
A method of determining a type of a disc for a disc system to record/reproduce a plurality of recordable discs having different track pitches, including detecting a plurality of signals for determination while moving an objective lens up or down and simultaneously making the objective lens vibrate in a radial direction of the disc, and determining the types of the discs having different track pitches by using the detected signals for determination.
Claims38
A method of determining a type of a disc from a plurality of types of discs corresponding to different track pitches for an disc recordable/reproducible system, the method comprising:
- detecting a plurality of signals for determination of the type of the disc while moving an objective lens in an up or down direction and simultaneously vibrating the objective lens in a radial direction of the disc;
- and
- determining the type of the disc according to the track pitch by using the detected signals for determination of the type of the disc.
A method of determining a type of a disc for a disc system capable of recording and/or reproducing and having an optical pickup including a light emitting device, an objective lens, and a light receiving device, the method comprising:
- detecting a track error signal, a focus error signal, and/or a sum signal of the light receiving device while moving the objective lens in an up or down direction and simultaneously vibrating the objective lens in a radial direction of the disc;
- and
- determining the type of the disc according to a track pitch by using amplitude of the detected track error signal, the detected focus error signal, and/or the detected sum signal of the light receiving device.
An apparatus for determining a type of a disc for a disc system capable of recording and/or reproducing, the apparatus comprising:
- an optical pickup including a laser diode, an objective lens, and a light receiving device;
- a driving portion moving the objective lens id an up or down direction and simultaneously vibrating the objective lens in a radial direction of the disc;
- a detection unit detecting a sum signal of the light receiving device, a track error signal, and/or focus error signal while the objective lens is moving in the up or down direction and simultaneously vibrating in the radial direction by the driving portion;
- and
- a controller determining the type of disc according to the track pitch by using the detected sum signal of the light receiving device, the detected track error signal, and/or the detected focus error signal.
A method of determining a type of a disc according to different track pitches for a disc recording/reproducing system, the method comprising:
- detecting a plurality of disc-type determination signals needed for disc determination while moving an objective lens in a direction perpendicular to a surface of the disc and simultaneously vibrating the objective lens in a radial direction of the disc;
- and
- monitoring each of the detected disc-type determination signals to determine whether the disc is a disc having a narrow track pitch or a disc having a wide track pitch,
- wherein the moving direction of the objective lens is reversed after a predetermined time after a point when one of the disc-type determination signals is determined such that a disc determination time is reduced.
A method of determining a type of a disc from a plurality of types of discs corresponding to different track pitches, the method comprising:
- moving an objective lens of a disc recording/reproducing system in a direction perpendicular to a surface of the disc from a position previously set for focus while simultaneously vibrating the objective lens in a radial direction of the disc;
- reversing the moving direction of the objective lens after a predetermined time passes when any one of a plurality of disc-type determination signals is detected while simultaneously vibrating the objective lens in a radial direction of the disc;
- and
- repeating a predetermined number of times the reversing the moving direction of the objective lens after the predetermined time passes when any one of the plurality of disc-type determination signals is detected.
An apparatus for determining a type of a disc that is loaded in a recording/reproducing disc system from a plurality of types of discs corresponding to different track pitches, the apparatus comprising:
- a pickup having an objective lens;
- a driving unit moving the objective lens toward and away from a surface of the disc and simultaneously vibrating the objective lens in a radial direction of the disc;
- a detection unit detecting a plurality of signals needed for determining the type of the disc while the objective lens is moved by the driving unit;
- and
- a controller determining the type of the disc loaded in the disc system by using the detected signals for determining the type of the disc.
Dependencies are inferred from the claim text.