Recording apparatus
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKousei Sano, Yoshiaki Komma, Fumitomo Yamasaki, Kanji Wakabayashi
Life of this patent
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Abstract
A recording device of the present disclosure includes a light source, an objective lens, a beam splitter, an optical element, a detector and an operation circuit. The optical element divides a light beam into a first main region, a second main region, a first main end region, a second main end region, a first sub-region, and a second sub-region. The operation circuit generates a main signal in which a first main end region signal is multiplied by a coefficient a and added to the first main region signal, and a second main signal in which a second main end region signal is multiplied by the coefficient α and added to the second main region signal.
Claims8
A recording apparatus comprising:
- a light source configured to emit a light beam;
- an objective lens configured to focus the light beam on a recording medium having a groove-shaped track capable of recording information;
- a beam splitter configured to split the light beam reflected and diffracted by the recording medium from a light path of the light source;
- an optical element configured to divide the light beam split by the beam splitter into desired regions;
- a detector configured to receive a light of each region of the desired regions divided by the optical element;
- and
- a first operation circuit configured to calculate a signal received from the detector and output the signal,
- wherein the optical element divides the light beam split by the beam splitter, into
- a first main region mainly including a region in which a zero-order light and a plus first-order diffracted light of the track overlap with each other,
- a second main region mainly including a region in which the zero-order light and a minus first-order diffracted light of the track overlap with each other,
- a first main end region mainly including both ends in a track tangential direction of the region in which the zero-order light and the plus first-order diffracted light of the track overlap with each other,
- a second main end region mainly including both ends in the track tangential direction of the region in which the zero-order light and the minus first-order diffracted light of the track overlap with each other,
- a first sub-region located at both ends outside of the first main end region in the track tangential direction, and
- a second sub-region located at both ends outside of the second main end region in the track tangential direction, and
- the first operation circuit generates a first main signal in which a signal from the first main end region is multiplied by a coefficient α that is greater than 1 and added to a signal from the first main region, and a second main signal in which a signal from the second main end region is multiplied by the coefficient α and added to a signal from the second main region.
Dependencies are inferred from the claim text.