Sony Corporation

The Lion Fat and Oil Co. Ltd.

Yoshio Aoki

Tetsu Watanabe

Hideyoshi Horimai

Akira Kawakami

Toshiaki Ogoshi

Tamotsu Yamagami

Koji Sasaki

Kyozo Kitano

Tsunenari Saito

Yoshihiro Tsukamura

Fumiaki Henmi

Osamu Kawakubo

Haruo Ohkouchi

Kietsu Iwabuchi

Masao Honda

A magneto-optical disc system includes a magneto-optical disc with a light transmitting protective layer, an objective lens for bundling or focusing a laser beam onto a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit formed as a coil pattern on a transparent optical glass layer. In the magneto-optical disc system, the thickness t [object Object]

Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens

An optical disc system uses an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The thickness of the light-transmitting cover falls within the range of 0.05 mm to 0.6 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 1.10, and the wavelength of the light beam is selected to be between 100 nm to 780 nm.

Optical disk having a protective layer specified thickness relative to the NA of an objective lens and the wavelength of light source

When a plurality of magneto-optic disks are inserted via a mail slot provided in a front panel block, a controller controls a manipulator of a robotics block so as to load magneto-optic (MO) disks in MO disk arrays constituted by connecting a plurality of MO drives and one Redundant Array of Inexpensive Disk (RAID) controller. Then, when a RAID recording system is selected by the user, the controller controls the recording operation of the MO disk arrays in accordance with the selected recording system. More specifically, when a RAID recording striping system is selected by the user, the controller divides the data supplied from the outside and controls the recording operation of the MO drives so as to perform the recording in parallel by the MO drives. As a result, data such as image data may be handled with a high transfer speed.

Recording apparatus having a partially exchangeable disk array, a loading/unloading device, and a control device and which uses a disk-like recording medium

Disclosed is a magneto-optical disc system comprising a magneto-optical disc,with a light-transmitting cover,an objective lens,for bundling or focusing a laser beam on a magnetic recording layer,of the magneto-optical disc,in order to perform recording and/or reproduction, and a magnetic field generating unit,obtained by forming a coil pattern,in an optical glass,In the above system, the thickness t,of the light-transmitting cover,is set to fall within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens,is set to fall within the range of 0.55 to 0.70, so as to obtain high-density recording and/or reproduction.

Optical disk system having objective lens with a numerical aperture related to thickness of protective layer

An magneto-optical disc system includes an magneto-optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the magneto-optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70 and the wavelength of the light beam is selected to be between 635 and 680 nanometers.

Magneto-optical disk system having an objective lens with a numerical

An optical disc system uses a rewritable optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The recording layer is formed of a phase-change material. The thickness of the light-transmitting cover falls within the range of 0.05 mm to 0.6 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 1.10, and the wavelength of the light beam is selected to be between 100 nm to 780 nm.

Optical disk and optical disk system with numerical aperture of

When a plurality of magneto-optic disks are inserted via a mail slot (12) provided in a front panel block (1), a controller block (23) controls a manipulator of a robotics block (2) so as to load the magneto-optic disks in Magneto-Optic disk arrays (4) and (5) constituted by connecting a plurality of Magneto-Optic drives and one Redundant Array of Inexpensive Disk controller. When the Redundant Array of Inexpensive Disk recording system is selected by the user, the controller block (23) controls the recording operation of the Magneto-Optic disk arrays (4) and (5) in accordance with the selected recording system. More specifically, when the Redundant Array of Inexpensive Disk recording system of striping is selected, the controller block (23) divides the data supplied from the outside and controls the recording operation of the Magneto-Optic drives so as to perform the recording in parallel by the Magneto Optic drives. Thus, it becomes possible to handle data of a high transfer speed such as image data.

Apparatus for recording magneto-optic disks

Optical disk having a protective layer of specified thickness relative

A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting layer 41, an objective lens 2 for bundling or focusing a laser beam onto a magnetic recording layer 43 of the magneto-optical disc 40 for recording information thereon and/or reproducing information therefrom, and a magnetic field generating unit 9 having a coil pattern 7 arranged on an optical glass element 8. The thickness t.sub.2 of the light-transmitting layer 41 falls within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens 2 falls within the range of 0.55 to 0.70.

Optical disk system having an objective lens with a numerical aperture

A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting cover layer 41, an objective lens 2 for bundling or focusing a laser beam onto a magnetic recording layer 43 of the magneto-optical disc 40 for recording information thereon and/or reproducing information therefrom, and a magnetic field generating unit 9 having a coil pattern 7 arranged on an optical glass element 8. The thickness t.sub.2 of the light-transmitting cover layer 41 falls within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens 2 falls within the range of 0.55 to 0.70.

Optical disc system having an objective lens with a numerical aperture

Magneto-optical disc system having an objective lens with a numerical

An optical disc system using an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a laser beam on a recording layer of the optical disc in order to perform recording and/or reproduction. The thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70 and the wavelength of the light beam is selected to be between 635 and 650 nanometers.

Optical disc system and optical disk therefor

Optical disc system and optical disc therefor

A magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit obtained by forming a coil pattern in an optical glass. In the above system, the thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70, so as to obtain high-density recording and/or reproduction by permitting the lens to be quite close to the actual recording layer.

Magneto-optical disk system with specified thickness for protective

A is a magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit obtained by forming a coil pattern in an optical glass. In the above system, the thickness t.sub.2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70, so as to obtain high-density recording and/or reproduction by permitting the lens to be quite close to the actual recording layer.

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Tokyo, Japan

Yoshio Aoki