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公开(公告)号：MY116529A
公开(公告)日：2004-02-28
申请号：MYPI9602310
申请日：1996-06-07
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: AN OPTICAL PICKUP INCLUDING A LIGHT SOURCE (21) FOR RADIATING A LIGHT BEAM, A DIFFRACTION ELEMENT (22) FOR SEPARATING A LIGHT BEAM RADIATED FROM THE LIGHT SOURCE INTO AT LEAST THREE BEAMS, NAMELY A MAIN BEAM AND TWO SIDE BEAMS, AN OBJECTIVE LENS (25) FOR CONVERGING THE LIGHT BEAMS SEPARATED BY THE DIFFRACTION ELEMENT (22) ON A SIGNAL RECORDING SURFACE OF THE OPTICAL RECORDING MEDIUM (11), A LIGHT RECEIVING UNIT (24) HAVING A FOURSEGMENT FIRST LIGHT RECEIVING PORTION (51/71/81) FOR RECEIVING THE MAIN BEAM REFLECTED BY THE RECORDING SURFACE OF THE OPTICAL RECORDING MEDIUM (11) AND SECOND (52/72/82) AND THIRD (53/73/83) LIGHT RECEIVING PORTIONS ARRANGED ON BOTH SIDES OF THE FIRST LIGHT RECEIVING PORTION FOR RECEIVING THE SIDE BEAMS REFLECTED BY THE RECORDING SURFACE OF THE OPTICAL RECORDING MEDIUM (11), AND A CALCULATION UNIT (24) FOR GENERATING A FIRST TRACKING SIGNAL BASED ON RESPECTIVE OUTPUTS OF THE FIRST LIGHT RECEIVING PORTION AND FOR GENERATING A SECOND TRACKING SIGNAL BASED ON OUTPUTS OF THE SECOND AND THIRD LIGHT RECEIVING PORTIONS. (FIG 7)
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公开(公告)号：AT227874T
公开(公告)日：2002-11-15
申请号：AT96401810
申请日：1996-08-22
Applicant: SONY CORP
Inventor： YAMAKAWA AKIO , USUI TETSUO , UTSUMI MASAMICHI
Abstract: There is disclosed a method of playing back information from an optical multilayer disk having a plurality of recording disks stacked on top of each other, by the use of an optical pickup device. In order to switch the focused recording layer from a first one to a second one so that data is read from the second recording layer, the focus balanced condition of the pickup device is switched from a setting (Ra) providing a focus error characteristic adapted for the first recording layer to a reference setting (Rb) providing a neutral focus error characteristic. Then, the focal point of the pickup device is moved from the first recording layer. Subsequently, the pickup device is focused onto the second recording layer, and data is read from the second recording layer. Thereafter, the focus balanced condition of the pickup device is switched to a setting (Rc) adapted to the second recording layer.
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公开(公告)号：BR9602750A
公开(公告)日：1998-09-08
申请号：BR9602750
申请日：1996-06-12
Applicant: SONY CORP
Inventor： YAMAKAWA AKIO , UTSUMI MASAMICHI , UEMURA KAMON , OHSATO KIYOSHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：ES2149435T3
公开(公告)日：2000-11-01
申请号：ES96401271
申请日：1996-06-12
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：AT195829T
公开(公告)日：2000-09-15
申请号：AT96401271
申请日：1996-06-12
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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Patent Agency Ranking
公开(公告)号：AU5580796A
公开(公告)日：1997-01-02
申请号：AU5580796
申请日：1996-06-06
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：DE69624763D1
公开(公告)日：2002-12-19
申请号：DE69624763
申请日：1996-08-22
Applicant: SONY CORP
Inventor： YAMAKAWA AKIO , USUI TETSUO , UTSUMI MASAMICHI
Abstract: There is disclosed a method of playing back information from an optical multilayer disk having a plurality of recording disks stacked on top of each other, by the use of an optical pickup device. In order to switch the focused recording layer from a first one to a second one so that data is read from the second recording layer, the focus balanced condition of the pickup device is switched from a setting (Ra) providing a focus error characteristic adapted for the first recording layer to a reference setting (Rb) providing a neutral focus error characteristic. Then, the focal point of the pickup device is moved from the first recording layer. Subsequently, the pickup device is focused onto the second recording layer, and data is read from the second recording layer. Thereafter, the focus balanced condition of the pickup device is switched to a setting (Rc) adapted to the second recording layer.
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公开(公告)号：DE69609902D1
公开(公告)日：2000-09-28
申请号：DE69609902
申请日：1996-06-12
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：AU714000B2
公开(公告)日：1999-12-16
申请号：AU5580796
申请日：1996-06-06
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：CA2178685A1
公开(公告)日：1996-12-13
申请号：CA2178685
申请日：1996-06-10
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup including a light source for radiating a light beam, a diffraction element for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens for converging the light beams separated by the diffraction element on a signal recording surface of the optical recording medium, a light receiving unit having a four-segment first light receiving portion for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions arranged on both sides of the first light receiving portion for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit for generating a first tracking signal based on respective outputs of the first light receiving portion and for generating a second tracking signal based on outputs of the second and third light receiving portions.
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