Optical pickup apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorBong-gi KIM
Life of this patent
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Abstract
An optical pickup apparatus includes a light source to emit light of a predetermined wavelength, an objective lens to focus the light emitted from the light source to form a light spot on an optical disc having a plurality of recording layers, a photodetector to detect a signal and an error signal by detecting the light reflected from the optical disc, and a light scattering portion to reduce an amount of the light reflected from a non-target layer of the recording layers and incident on the photodetector by scattering part of the light reflected from the optical disc during a reproduction of data from the optical disc.
Claims25
An optical pickup apparatus comprising:
- a light source to emit light;
- an objective lens to focus the light emitted from the light source on a target reproduction layer of an optical disc having a plurality of recording layers;
- a photodetector to detect the light reflected from the optical disc;
- and
- a light scattering portion to reduce an amount of the light reflected from one or more non-target layers of the recording layers and incident on the photodetector by scattering a part of the light reflected from the optical disc during a reproduction of data from the optical disc.
An optical path changer used in an optical pickup apparatus including a light source to emit light, an objective lens to focus the light emitted from the light source on an optical disc having a plurality of recording layers, and a photodetector to detect a signal by detecting the light reflected from the optical disc, wherein the optical path changer guides the light emitted from the light source toward the objective lens and the light reflected from the optical disc toward the photodetector, and wherein a light scattering portion is formed on a surface of the optical path changer facing the photodetector to scatter the light reflected from the optical disc and incident on the photodetector.
An optical reproducing apparatus comprising:
- a spindle motor to rotate an optical disc having a plurality of recording layers;
- an optical pickup movably installed in a radial direction of the optical disc to reproduce information from the optical disc;
- a driving portion to drive the spindle motor and the optical pickup;
- and
- a control portion to control focusing and tracking servos of the optical pickup,
- wherein the optical pickup apparatus comprises:
- a light source to emit light,
- an objective lens to focus the light emitted from the light source on a target layer of the optical disc,
- a photodetector to detect the light reflected from the optical disc, and
- a light scattering portion to reduce an amount of light reflected from a non-target layer of the optical disc and incident on the photodetector by scattering a part of the light reflected from the optical disc during a reproduction of data from the optical disc.
A plate used in an optical pickup apparatus including a light source to emit light, an objective lens to focus the light emitted from the light source on an optical disc having a plurality of recording layers, and a photodetector to detect a signal by detecting the light reflected from the optical disc, wherein the plate is disposed anywhere along an optical path from the light source to the photodetector, and comprises a light scattering portion to scatter the light reflected from the optical disc and incident on the photodetector.
Dependencies are inferred from the claim text.