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Patent Agency Ranking
公开(公告)号：DE69624763T2
公开(公告)日：2003-07-17
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：DE69609902T2
公开(公告)日：2001-03-22
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：BR9603502A
公开(公告)日：1998-05-12
申请号：BR9603502
申请日：1996-08-21
Applicant: SONY CORP
Inventor： UTSUMI MASAMICHI , USUI TETSUO , YAMAKAWA AKIO
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：MX9602266A
公开(公告)日：1997-10-31
申请号：MX9602266
申请日：1996-06-10
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: Un dispositivo de captacion optico que incluye una fuente luminosa para irradiar un haz luminoso, un elemento de difraccion para separar un haz luminoso irradiado de la fuente luminosa en por lo menos tres haces, a saber un haz principal y dos haces laterales, un lente objetivo para convergir los haces luminosos separados por el elemento de difraccion sobre una superficie de registro de señales del medio de registro optico, una unidad receptora de luz que tiene una primera porcion receptora de luz de cuatro segmentos para recibir el haz principal reflejado por la superficie de registro del medio de registro optico y segunda y tercera porciones receptoras de luz colocadas a ambos lados de la primera porcion receptora de luz para recibir los haces laterales reflejados mediante la superficie de registro del medio optico, y una unidad de cálculo para generar una primera señal de seguimiento basándose en las salidas respectivas de la primera porcion receptora de luz para generar una segunda señal de seguimiento basándose en las salidas de la segunda y tercera porciones receptoras de luz.
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公开(公告)号：CA2183487A1
公开(公告)日：1997-02-23
申请号：CA2183487
申请日：1996-08-16
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 providing a focus error characteristic adapted for the first recording layer to a reference setting 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 adapted to the second recording layer.
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