摘要:
In the optical recording element of the invention, alignments of long thin pits inclined in various directions with respect to the track direction are formed on the tracks and information is recorded therein according to the different inclines of the pits, thereby performing higher-density and larger-volume recording without reducing the spacing between each pit and the track pitch. The invention also discloses an optical data retrieval system for use with the above optical recording element, which scans the pit alignments with a laser beam spot, detects the inclines of the pits by obtaining the distribution of the intensity of reflected light which is caused by light diffraction at the pits, and plays back information in accordance with the inclines. Therefore, not only can the substantially same structure as that of a standard type optical data retrieval system be applied to the invention without making any complicated change, but also cross-talk is less likely to be produced in the read out signals.
摘要:
An apparatus for recording and reproducing information on and from an optical disk is disclosed in which at least one optical beam and a reference clock signal are used. The optical disk comprises recording tracks which are divided into a plurality of blocks and concentrically arranged along the radial direction. The apparatus comprises: a block judging unit for judging one of the blocks that the one block is currently impinged by the optical beam; a clock signal generator for generating a plurality of clock signals which are different in frequency from each other; and a clock signal selecting unit for selecting one of the clock signals as the reference clock signal, on the basis of the judgement of the block judging unit.
摘要:
In the optical recording element of the invention, alignments of long thin pits inclined in various directions with respect to the track direction are formed on the tracks and information is recorded therein according to the different inclines of the pits, thereby performing higher-density and larger-volume recording without reducing the spacing between each pit and the track pitch. The invention also discloses an optical data retrieval system for use with the above optical recording element, which scans the pit alignments with a laser beam spot, detects the inclines of the pits by obtaining the distribution of the intensity of reflected light which is caused by light diffraction at the pits, and plays back information in accordance with the inclines. Therefore, not only can the substantially same structure as that of a standard type optical data retrieval system be applied to the invention without making any complicated change, but also cross-talk is less likely to be produced in the read out signals.
摘要:
An optical magnetic memory device includes an optical magnetic recording medium such as a disc having recording magnetic film at least on one side thereof and initialized in a certain direction in advance, a recording section for recording data in such a manner that data-recorded portions and non-recorded portions are alternately formed, and a reproducing section for reproducing data from the recording medium by detecting the interval between the recorded or non-recorded portions. The reproducing section comprises a detector for detecting positive and negative peaks of signals reproduced from the recorded or non-recorded portion and a selector for selecting either of the detection outputs from the detector according to a control signal.
摘要:
A magneto-optical head assembly for a reflection type magneto-optical memory apparatus uses a laser beam for recording, retrieving, and erasing data on a recording medium comprised of a vertical, magnetic, and anisotropic thin film. The light beam emitted from the head assembly is guided to a fixed position on said recording medium. Included are a light detection apparatus for receiving a control signal, and a separate light detection apparatus for receiving a data signal. A beam splitter, to which has been applied a multicoated thin film dielectric body capable of increasing the Kerr rotation angle of the laser beam reflected from the recording medium, is positioned in the optical system through which the laser beam passes.
摘要:
There is disclosed a head assembly for use in a magneto-optic recording/playback system which includes a memory medium having a magnetic coating having a magnetic anisotropy in a vertical direction. A light beam is applied to the memory medium for recording and reproduction of information. The head assembly includes a polarizing prism and a Faraday effect element in an optical path for the light beam. There is needed only the single polarizer.
摘要:
A magneto-optic memory medium comprises a reflector exhibiting reflectance for light used for information reproduction and a magneto-optic magnetization film disposed on the reflector. When light is applied for information reproduction, the light impinges on the magnetization film and reaches the reflector. The light reflected through the reflector and the magnetization film is of use for information reproduction. In a preferred form of the magneto-optic memory medium, there is deposited on a transparent substrate a magnetic film having an axis of easy magnetization perpendicular to its surface. The magnetization film is overlaid with a reflective coating which is shaped into a strip configuration.
摘要:
An optical memory element includes a guide track groove portion and address signal pit portion for indicating the address of the guide track groove. The address signal pit portion has a pit width narrower than the groove width of the guide track groove portion.
摘要:
Provided is a lithium secondary battery excellent in initial charge/discharge characteristics and high in capacity comprising lithium-rechargeable cathode and anode and a nonaqueous electrolyte, wherein at least one of the cathode and the anode contains one of the following (A), (B) and (C):(A) a composite material comprising a carbon powder and a binder, which is treated with a silane coupling agent,(B) a composite material comprising a binder and a mixed carbon powder containing 70-99% by weight of a graphite powder and 30-1% by weight of a pseudo-graphitic carbon black, and(C) a composite material comprising a composite oxide powder of lithium and a transition metal, a conductive powder and a binder, which is treated with a silane coupling agent.
摘要:
An optical disk recording/reproducing device for recording or reproducing information on or from an optical disk while rotatively driving the optical disk at a constant angular velocity. The disk has pre-recorded information cyclically formed along a track so as to provide rotation control at a constant linear velocity. The device, which includes a clock generating circuit for generating a clock signal for recording or reproducing in accordance with a recording frequency of the pre-recorded information derived from signals reproduced by an optical head, is designed to perform recording or reproducing operations with a recording frequency according to the clock signal. The device further includes a magnetic filed control circuit and a recording light power control circuit whereby a magnetic field and light power to be applied to the optical disk is varied according to the recording frequency during recording operations.