Optical information storage medium system and method of generating tracking error signal
AssigneeSamsung Electronics Co., Ltd.
InventorsKyongtae Park, Tae-kyung Kim, Jae-cheol Bae
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Abstract
An optical information storage medium system includes an optical pick-up to detect a main push-pull signal and a sub-push pull signal, and a signal operating unit including first and second operating parts to respectively generate a main push-pull signal and a sub-push-pull signal, a noise removing unit to electrically filter the sub-push-pull signal to remove noise caused by light reflected by layers other than a target layer for recording and/or reproducing, and a subtractor to generate a tracking error signal by subtraction of the main push-pull signal and the sub-push-pull signal which is filtered by the noise removing part.
Claims31
An optical information storage medium system, comprising:
- an optical pick-up to irradiate light to an optical information storage medium and detect the light reflected by the optical information storage medium, comprising:
- a diffraction device to divide the light emitted from a light source into a main light beam which is transmitted straight through the diffraction device and a first diffracted light beam, and to radiate the main light beam and the first diffracted light beam to the optical information storage medium, and
- a photo detector, comprising:
- a main photo detector to detect the main light beam reflected by the optical information storage medium;
- and
- a first sub-photo detector to detect the first diffracted light beam reflected by the optical information storage medium;
- and
- a signal operating part to generate a tracking error signal, comprising:
- first and second operating parts to respectively generate a main push-pull signal and a first sub-push-pull signal from the main light beam and the first diffracted light beam detected by the main photo detector and the first sub-photo detector,
- a noise removing unit to electrically filter the first sub-push-pull signal to remove noise due to part of the light reflected by a layer other than a target layer for recording and/or reproducing data to and/or from the optical information storage medium, and
- a subtractor to generate the tracking error signal by subtraction using the main push-pull signal and the first sub-push-pull signal.
A method of generating a tracking error signal, comprising:
- irradiating light emitted from a light source to an optical information storage medium by dividing the light into a main light beam which is transmitted in a straight direction and a diffracted light beam;
- generating a main push-pull signal and a sub-push-pull signal by respectively detecting the main light beam reflected by the optical information storage medium and the diffracted light beam reflected by the optical information storage medium;
- electrically filtering noise due to the light reflected by a layer other than a target layer for recording and/or reproducing data from the sub-push-pull signal;
- and
- generating a tracking error signal by subtracting the sub-push-pull signal from the main push-pull signal.
An optical information storage medium system, comprising:
- an optical pick-up, comprising:
- a diffraction device to divide a light beam into a main light beam and a first diffracted light beam, and
- a photo detector to detect the main light beam and the first diffracted light beam;
- and
- a signal operating part to respectively generate a main push-pull signal and a first sub-push-pull signal based on the main light beam and the first diffracted light beam, to electrically filter the first sub-push-pull signal, and to generate a tracking error signal based on the main push-pull signal and the electrically filtered first sub-push-pull signal.
A method of generating a tracking error signal, comprising:
- generating a main push-pull signal and a first sub-push-pull signal using a main light beam reflected by an optical information storage medium and a first diffracted light beam reflected by the optical information storage medium;
- electrically filtering the first sub-push-pull signal;
- and
- generating a tracking error signal based on the main push-pull signal and the first sub-push-pull signal.
Dependencies are inferred from the claim text.