36 results about "Magneto-optical drive" patented technology

A magneto-optical recording head comprises a magnetic coil formed on a lower surface of a transparent substrate opposed to a magneto-optical disk. A heat sink layer is provided at the outside of the magnetic coil on the lower surface. An objective lens is supported on an upper surface of the transparent substrate. The heat, which is generated by the magnetic coil, is released via the heat sink layer to the space between the magneto-optical disk and the substrate. The release of the heat is facilitated by the air stream which is generated by the rotation of the magneto-optical disk. The heat can be effectively released from the magnetic coil without inhibiting optical characteristics of the objective lens.

A magneto-optical disc device (1) writes data, for each sector, onto a magneto-optical disc (2) using an optical head portion (21) which outputs light onto the magneto-optical disc, at which time the data on the magneto-optical disc (2) is erased and after data is erased, data is written onto the magneto-optical disc (2), and the original data is then verified against the written data for each sector. When verifying the original data against the written data, if a verification error is detected for a sector, position information for the sector on the magneto-optical disc (2) in which a verification error is detected is stored in memory (16). Data verification is continued even when a verification error is detected, and at the end of data verification, data verification is again performed for sectors in which verification errors are detected, based on the position information for sectors stored in memory (16).

A digital camera (10) includes a CPU (46). When a power source is turned on, the CPU (46) determines an available area of a recording destination on the basis of an FAT recorded on a magneto-optical disk (44). Compressed image data created on the basis of an operation of a shutter button (48) is recorded on the determined available area. When succeeding in recording, the FAT is renewed. When failing in recording due to a defect of the magneto-optical disk (44), a message is displayed on a monitor (28). When a set key (50) is operated after displaying the message, a write protection is set on the magneto-optical disk (44).

This invention relates to magneto-optical recording media such as magneto-optical disks and cards, manufacturing methods of the medium and a magneto-optical recording and playback device to record and play back data using the magneto-optical recording media. The magneto-optical recording medium of the present invention has a recording layer and a reflective layer on a substrate, and the recording layer has a layered structure in which at least one spinel ferrite (or rutile-type oxide or hematite) layer and at least one garnet ferrite layer are piled together. It is preferable that the layered structure is formed on tracks where data are recorded. The manufacturing method of the present invention comprises the steps of heat treatment in the range of 500-700° C., preferably 600-630° C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data of the present invention, the wavelength of light for recording data is different from that for reading data, which is preferable for a magneto-optical recording medium comprising a garnet ferrite layer.

An optical recording device includes a recording condition determining section for determining recording conditions for a track by performing test writing with respect to the track which is, for example, either a land or a groove of a magneto-optical disk, a recording condition computing section for performing computation in accordance with computation-use information based on the recording conditions for the track so as to determine recording conditions for the other track, a track switch section for switching tracks to be used for test writing, and a computation-use information managing section for correcting the computation-use information based on respective results of test writing before and after the switch, thereby determining recording conditions for one of the tracks in short time by computation, while, because the computation-use information is corrected based on the results of test writing, improving accuracy in recording conditions obtained by computation.

A magneto-optical disk which reproduces information with an optical pickup head which uses an electromagnetic force as the driving force is provided. Other areas than at least the recording track are magnetized uniformly in a direction of canceling the influence of external magnetic field applied by the optical pickup head or a recording pattern having a frequency higher than modulation transfer function (MTF) of the optical pickup head is recorded to the other areas than at least the recording track. Read signals SP12 and SP14 from the magneto-optical disk are low in bit error rate.

A recording/reproducing device using a magneto-optical disc as a recording medium having a holder for holding a magneto-optical disc and moving the magneto-optical disc between a disc unloading position and a disc loading position, a turntable for rotating the magneto-optical disc, an optical pickup for casting a light beam onto a signal recording surface of the magneto-optical disc, a magnetic head arranged to face the optical pickup on the opposite sides side of the magneto-optical disc and moving toward and away from the magneto-optical disc, and a rotating ejection lever positioned on a base for ejecting the magneto-optical disc held by the holder. Since the ejection lever is arranged on the side of the base where the optical pickup is arranged, the space within the device body is effectively used, thus realizing miniaturization.

A disc drive (A) for data transfer between a magneto-optical disc (B) and a host (C) is provided. The disc drive reads and stores in a RAM (12) medium identification information unique to the magneto-optical disc (B) and DMA information (B2) including a list of addresses indicating defective areas upon loading, and performs address conversion with reference to the DMA information (B2) for the data transfer. A CPU (11) checks if the medium identification information obtained when loading the magneto-optical disc (B) is identical with or different from medium identification information obtained in the previous loading. The CPU (11) allows the reading of DMA information (B2) and replacing of the previous DMA information remaining in a DMA information storage area (12D) of the RAM (12) with the newly obtained DMA information only when the newly obtained medium identification information is different from the previous medium identification information.

A manufacturing method of a domain wall displacement type magneto-optical recording medium comprises the steps of depositing a magnetic layer on a substrate to prepare a disc, and irradiating the magnetic layer with a converged light beam while applying a magnetic field and annealing the magnetic layer a converged light beam between information tracks. A domain wall displacement type magneto-optical disc comprises a domain wall displacement layer in which a domain wall displaces, a memory layer that holds a recording magnetic domain according to information, a switching layer that is provided between the domain wall displacement layer and the memory layer and has a Curie temperature lower than that of those layers, and a disconnecting area that is provided in the domain wall displacement layer and disconnects a switching connection between information tracks, wherein the polarity of a residual magnetization at a boundary between the information track and the disconnection area is oriented in a certain direction.

A disk reproducing device for reproducing a domain-wall-displacement type, super-resolution reproducing magnetooptic disk, wherein when the wavelength of a laser beam for reproducing signals recorded on an MO disk by being applied to the MO disk is lambda and its numerical aperture NA, the width Tw of a track provided on the MO disk satisfies Tw <= 0.046 x (lambda/NA), whereby a detrack allowance of at least 160 nmpp is ensured and designing of tracking of a disk drive is made easy.

This invention discloses one blue light magnetic disc, which comprises underlay, first SiN media layer, TbFeCo record layer, second SiN media layer and A1 reflection layer. The invention is characterized by the following: the said record layer and second SiN media layer set with one layer of thermal control film. This invention coats one layer of metal film tightly to record layer as heat transmission layer to control over high temperature of record layer to improve the read valve efficiency and to improve signal to noise proportion.

The invention provides a photomagnetic memory structure. According to the technical scheme, the photomagnetic memory structure comprises a main frame provided with a memory disk array, first sliding rails are symmetrically installed on the two transverse sides of the main frame, one or more second sliding rails are connected between the first sliding rails located on the same side of the main frame, and the second sliding rails are slidably connected with a read-write assembly; the read-write assembly comprises a read-write head connected to one end of the vibration arm and an electromagnet arranged on the side face of the vibration arm, and the electromagnet and the other end of the vibration arm are connected into a whole through a connecting rod. The electromagnet generates a magnetic field in a set period to attract the vibrating arm to drive the read-write head to perform simple harmonic vibration, so that the read-write head forms a set data read-write track on the surface of the memory disk. No high-speed rotating assembly is arranged, the number of storage disks and read-write assemblies is easy to expand, and storage capacity expansion and read-write speed improvement of a single magnetic/optical disk storage product are facilitated.