公开(公告)号：MY106851A

公开(公告)日：1995-08-30

申请号：MYPI19901269

申请日：1990-07-27

Applicant: SONY CORP

Inventor： TETSU WATANABE ,  TAMOTSU YAMAGAMI ,  KIETSU IWABUCHI ,  KOJI SASAKI ,  YOSHIO AOKI

IPC: G11B7/00

Abstract: A MAGNETO-OPTICAL PICKUP APPARATUS INCLUDES AN OBJECTIVE LENS FOR FOCUSING A LASER BEAM EMITTED FROM A LASER DEVICE ONTO A MAGNETO-OPTICAL RECORDING MEDIUM, DRIVING COILS, ON WHICH THE OBJECTIVE LENS IS MOUNTED, FOR DRIVING THE OBJECTIVE LENS IN FOCUSING AND TRACKING DIRECTIONS, AND A PLATE ARRANGED AT AN END PORTION OF THE DRIVING COILS BETWEEN THE OBJECTIVE LENS AND THE MAGNETO-OPTICAL RECORDING MEDIUM. THE PLATE IS FORMED WITH A COIL PATTERN FOR GENERATING A MAGNETIC FIELD TO BE APPLIED TO THE MAGNETO-OPTICAL RECORDING MEDIUM, AND CAN ALLOW A LASER BEAM TRANSMITTED THROUGH THE OBJECTIVE LENS TO PASS THERETHROUGH.@@@(FIG. 3)

公开(公告)号：SG96554A1

公开(公告)日：2003-06-16

申请号：SG200003208

申请日：2000-06-08

Applicant: SONY CORP

Inventor： NAOHIRO NETSU ,  YOSHITAKA AOKI ,  TETSU WATANABE ,  KAZUHIKO FUJIIE ,  YASUAKI MAEDA ,  TAKUYA KAERIYAMA

IPC: G11B7/007 ,  G11B7/013 ,  G11B7/24 ,  G11B7/26 ,  G11B11/105 ,  G11B23/00 ,  G11B23/03

Abstract: An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and a thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed. A magnetic-clamping hub is installed in the center hole and thus the medium is magnetically clamped to a rotation driving mechanism of an optical recording and/or reproducing apparatus. The compactness and high density of recording of the optical recording medium will contribute greatly to a further compact structure of a recording and/or reproducing apparatus in which the medium is to be used.

公开(公告)号：HK1049910A1

公开(公告)日：2003-05-30

申请号：HK03100422

申请日：2003-01-16

Applicant: SONY CORP

Inventor： TETSU WATANABE ,  YOSHIO AOKI

IPC: G11B11/10 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/135 ,  G11B7/24 ,  G11B11/105

公开(公告)号：MY126707A

公开(公告)日：2006-10-31

申请号：MYPI20002430

申请日：2000-05-31

Applicant: SONY CORP

Inventor： NAOHIRO NETSU ,  YOSHITAKA AOKI ,  TETSU WATANABE ,  KAZUHIKO FUJIIE ,  YASUAKI MAEDA ,  TAKUYA KAERIYAMA

IPC: G11B23/03 ,  G11B7/007 ,  G11B7/013 ,  G11B7/24 ,  G11B7/26 ,  G11B11/105 ,  G11B23/00

Abstract: AN OPTICAL RECORDING MEDIUM (1)IS PROVIDED WHICH HAS A SUBSTRATE ANS A SIGNAL RECORDING LAYER PROVIDED ON THE SUBSTRATE AND IN WHICH AN INFORMATION SIGNAL IS RECORDED IN THE FORM OF MICROSCOPIC PITS . A LIGHT BEAM IS FOCUSED ON THE SIGNAL RECORDING LAYER AND SOME CHANGE OF THE LIGHT BEAM CARRIED BY A RETURN LIGHT FROM THE SIGNAL RECORDING LAYER IS DETECTED TO READ THE INFORMATION SIGNAL RECORDED ON THE SIGNAL RECORDING LAYER. THE OPTICAL RECORDING MEDIUM (1) HAS A DIAMETER OF 65 MM OR LESS AND A THICKNESS OF 0.4 TO 0.70 MM . AN INFORMATION SIGNAL RECORDING AREA EXTENDS OUTWARDLY FROM A RADIAL POSITION OF 12.5 MM OR LESS FROM THE CENTER OF THE MEDIUM (1). THE RATIO IN AREA BETWEEN THE INFORMATION SIGNAL RECORDING AREA AND NON-SIGNAL RECORDING AREA IS 3.4 OR MORE . THE STORAGE CAPACITY OF THIS MEDIUM (1) IS 2 GIGABYTES OR MORE . THE OPTICAL RECORDING MEDIUM (1) HAS FORMED AT THE CENTER THEREOF A CENTER HOLE (57) AROUND WHICH AN ANNULAR TABLE-ABUTMENT CONVEXING TO ONE SIDE OF THE MEDIUM (1) IS FORMED . A MAGNETIC-CLAMPING HUB (5) IS INSTALLED IN THE CENTER HOLE (57) AND THUS THE MEDIUM (1)IS MAGNETICALLY CLAMPED TO A ROTATION DRIVING MECHANISM OF AN OPTICAL RECORDING AND/OR REPRODUCING APPARATUS . THE COMPACTNESS AND HIGH DENSITY OF RECORDING OF THE OPTICAL RECORDING MEDIUM (1) WILL CONTRIBUTE GREATLY TO A FURTHER COMPACT STRUCTURE OF A RECORDING AND/OR REPRODUCING APPARATUS IN WHICH THE MEDIUM (1) IS TO BE USED.FIG.1

公开(公告)号：SG96617A1

公开(公告)日：2003-06-16

申请号：SG200102386

申请日：2001-04-26

Applicant: SONY CORP

Inventor： MASAHIRO YAMADA ,  AKIRA KOUCHIYAMA ,  TETSU WATANABE

IPC: G01Q60/22 ,  G02B3/00 ,  C03B19/02 ,  C03C15/00 ,  C03C17/34

Abstract: A first optical device (1100) according to the present invention comprises a base (1101) made of a first optical material and a second optical material (1102) having a refractive index different from that of the first optical material, and the base has a concavity (1101B), and the second optical material (1102) is filled in this concavity. A second optical device (1110) according to the present invention comprises a base (1111) made of a first optical material and a second optical material having a refractive index different from the first optical material, and the base (1111) comprises first and second faces facing each other, a first concavity (1101B) is formed in the first face (1110U) and a second concavity (1111B) is formed in the second face (1110B), and the second optical material is filled in the first (1101B) and second (1111B) concavities.