公开(公告)号：KR850003120Y1

公开(公告)日：1985-12-23

申请号：KR810006069

申请日：1981-08-29

Applicant: SONY CORP

Inventor： YAMAKAWA AKIO

IPC: G11B17/054 ,  F16P3/08 ,  G11B17/032 ,  G11B33/02 ,  G11B33/12 ,  G12B9/04

公开(公告)号：FR2489476A1

公开(公告)日：1982-03-05

申请号：FR8116504

申请日：1981-08-28

Applicant: SONY CORP ,  SONY CORP

Inventor： YAMAKAWA AKIO ,  AKIO YAMAKAWA

IPC: F16P3/08 ,  G11B17/032 ,  G11B33/02 ,  G11B33/12 ,  G12B9/04 ,  G11B17/054 ,  E05C13/02 ,  E05C13/04 ,  E05C13/06 ,  G11B17/02

Abstract: A.DISPOSITIF DE VERROUILLAGE DE COUVERCLE; B.DISPOSITIF CARACTERISE EN CE QU'IL COMPORTE UN MOYEN DE VERROUILLAGE, UN PREMIER MOYEN DE DEVERROUILLAGE POUR DEVERROUILLER LE MOYEN DE VERROUILLAGE LORSQUE L'ALIMENTATION DE L'APPAREIL EST ETABLIE ET LORSQUE LA VITESSE DE DEPLACEMENT DU SUPPORT D'ENREGISTREMENT EST INFERIEURE A UNE VALEUR PREDETERMINEE AINSI QU'UN SECOND MOYEN DE LIBERATION POUR LIBERER LE MOYEN DE VERROUILLAGE LORSQUE L'ALIMENTATION DE L'APPAREIL EST COUPEE; C.DISPOSITIF APPLICABLE A UN APPAREIL D'ENREGISTREMENT ETOU DE REPRODUCTION.

公开(公告)号：EP0776003A3

公开(公告)日：1998-09-16

申请号：EP96402501

申请日：1996-11-21

Applicant: SONY CORP

Inventor： YAMAKAWA AKIO ,  UEMURA KAMON

IPC: G11B7/09 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/013 ,  G11B7/13 ,  G11B7/135

CPC classification number: G11B7/133 ,  G11B7/0037 ,  G11B7/0909 ,  G11B7/131 ,  G11B7/1381 ,  G11B2007/0006

Abstract: A laser diode (41) applies a laser beam through a grating (42), a beam splitter (43), and an objective (44) to a compact disc. A laser beam reflected by the compact disc is applied through the objective and the beam splitter to a photodiode (61). The objective (44) has a large numerical aperture of 0.6 in order to be able to playback a digital video disc (20) that has a thin substrate and contains information recorded at a high density. To prevent the photodiode (61) from suffering aberrations caused due to the large numerical aperture of the objective, the photodiode has a relatively small photodetector unit (61-1) having a normalized detector size ranging from 3 µm to 16 µm, for detecting only returning light up to a numerical aperture of 0.3 and not detecting light of greater numerical aperture values.

Abstract translation: 的激光二极管（41）通过一个光栅（42），分束器（43），和客观（44）到一光盘适用的激光束。 由光盘反射的激光束通过物镜和分束器的光电二极管（61）中的应用。 物镜（44）具有0.6的数值孔径大，以便能够播放数字视频盘（20）做有一个薄的基板和含有记录在一个高密度信息。 为了防止引起患像差光电二极管（61），由于物镜的数值孔径大，光电二极管包括具有归一化检测尺寸为3微米到16微米的相对小光电检测器单元（61-1），用于 仅检测返回光到0.3的数值孔径和不大于检测数值孔径值的光。

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

IPC: G11B7/00 ,  G11B7/085 ,  G11B7/09

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.

公开(公告)号：DE69618908T2

公开(公告)日：2002-08-29

申请号：DE69618908

申请日：1996-11-21

Applicant: SONY CORP

Inventor： YAMAKAWA AKIO ,  UEMURA KAMON

IPC: G11B7/09 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/013 ,  G11B7/13 ,  G11B7/135

Abstract: A laser diode (41) applies a laser beam through a grating (42), a beam splitter (43), and an objective (44) to a compact disc. A laser beam reflected by the compact disc is applied through the objective and the beam splitter to a photodiode (61). The objective (44) has a large numerical aperture of 0.6 in order to be able to playback a digital video disc (20) that has a thin substrate and contains information recorded at a high density. To prevent the photodiode (61) from suffering aberrations caused due to the large numerical aperture of the objective, the photodiode has a relatively small photodetector unit (61-1) having a normalized detector size ranging from 3 mu m to 16 mu m, for detecting only returning light up to a numerical aperture of 0.3 and not detecting light of greater numerical aperture values.

公开(公告)号：DE69525722D1

公开(公告)日：2002-04-11

申请号：DE69525722

申请日：1995-12-14

Applicant: SONY CORP

Inventor： YAMAKAWA AKIO ,  SAITO TAKEHIKO ,  MATSUMOTO YOSHINORI

IPC: G11B21/02 ,  G11B7/08 ,  G11B7/085 ,  G11B7/095

Abstract: Disk producing apparatus comprises: a disk driving unit (2, 3) for rotating a disk (4); a pickup (5) having a first guide portion (8, 9) provided on one side portion and a guide face (10) provided on the other side portion; a base member (1) having a guide member (11) for receiving the guide face (10), the guide member (11) having a length shorter than the sliding distance of the pickup (5) in the guiding direction; a driving unit (13, 14, 15, 16) for driving the pickup (5) in the radial direction of the disk (4); and a signal processing unit for applying a specified processing to a signal reproduced from the pickup (5). Preferably, the first guide portion comprises: a guide shaft (8) supported on the base; and a guide bearing (9, 9) provided on the one side portion of the pickup (5) in such a manner as to be slidably inserted around the guide shaft (8). Such apparatus can be capable of improving the feeding accuracy of the pickup (5), reducing the cost of a feeding portion of the pickup (5), and realizing a small-sized skew adjustment mechanism at low cost.

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

IPC: G11B7/00 ,  G11B7/09 ,  G11B7/135 ,  G11B19/12

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.

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

IPC: G11B7/00 ,  G11B7/085 ,  G11B7/09 ,  G11B7/095

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.

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

IPC: G11B7/00 ,  G11B7/09 ,  G11B7/135 ,  G11B19/12 ,  G02B26/00

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.

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

IPC: G11B7/00 ,  G11B7/085 ,  G11B7/09 ,  G11B7/095

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.