Abstract: Spiral tracks are formed on a recording surface of an information disk such as an optical disk, and data is recorded by interleaving technique as well as adding error correction information. A disk driver rotates the information disk at a specified speed. Plural tracks are read simultaneously by a reading device. Analog data of the plural lines are converted into digital data by an A/D converter, and stored in a frame data buffer memory by each line. The data are respectively decoded sequentially in a decoder. When the disk makes one rotation, the data of next track is read in duplicate as much as the portion of the interleaving length of the tail data of each one of the plural tracks being read on the information disk. By data aligning means, according to a command from a controller, the data—corresponding to the number of tracks that can be read simultaneously—being output in parallel from the decoder are aligned sequentially from the head data on the information disk.

Abstract: An apparatus for generating a two dimensional array of modulated light beams. A laser and a collimator are used to generate a single collimated light beam. This collimated light beam is passed through a two dimensional holographic beam splitter. Thereupon, the holographic beam splitter produces a two dimensional divergent array of diffraction limited collimated light beams. These light beams are then independently modulated by a two dimensional modulator array.

Abstract: An optical information recording medium includes a plurality of recording layers, a reflectance of at least one of the plurality of the recording layers in a non-initialized state with respect to a light beam for initialization being smaller than a reflectance of the same in an initialized state with respect to the light beam for initialization. The recording layers are initialized by irradiating, among the plurality of recording layers, the recording layer positioned farther from a light beam irradiation side with the light beam prior to irradiating the recording layer positioned closer to the light beam irradiation side, so that the initialized recording layers have no initialization irregularities.

Abstract: The present invention provides an optical disk drive for writing multiple tracks of an optical disk.

Abstract: A magneto-optical data storage hard disk drive that uses stationary “Light Intensity Modulated Direct Over-Writey” (LIMDOW) or “Magnetically induced Super Resolution” (MSR) ‘Magneto-Optical Microhead Array Chips’ in place of conventional flying-heads, rotary voice-coil actuators, or other similar types of ‘servo-tracking’ mechanisms to simultaneously record and/or reproduce data to and/or from a multitude of data-tracks located across the data-surfaces of a multitude of LIMDOW or MSR disc media that comprise two or more different coercive force regions at room temperature, using a multitude of microheads.

Abstract: A method and apparatus for recording and reproducing data on and from an optical disk. The recording/reproducing apparatus records the data on an optical disk exhibiting a difference in an optical absorption rate between wavelengths using a light beam having a wavelength of a first standard. The data recorded on the optical disk is reproduced using a light beam having a wavelength of a second standard.

Abstract: In a crosstalk canceling system for use in an optical disk signal reproducing apparatus, rough delay units roughly adjust a delay amount of reproduction signals and fine delay units finely adjust a delay amount with high precision, and a delay amount control unit controls the delay amounts of the rough and fine delay units so that the jitter of the reproduction signal is minimized.

Abstract: A method for optical data recording includes focusing a preheat laser beam and a recording laser beam onto an optical recording medium, forming a preheat focused spot and a recording focused spot having nearly equal sizes; providing relative scanning motion between the optical recording medium and the recording focused spot in a direction parallel to the displacement from the preheat focused spot to the recording focused spot at a velocity sufficient to prevent thermal diffusion from the optical recording medium during the transit of the medium from the preheat focused spot to the recording focused spot; and modulating the preheat laser beam according to a modulated data signal, thereby creating preheated zones on the media surface with temperatures less than a threshold for complete mark formation.

Abstract: A control method for an optical disk drive is disclosed. In the control method, first and second light beams output from an optical head are irradiated to an optical disk. Information is recorded or reproduced using the first light beam, and information is deleted using the second light beam. The control method consists of steps described below. At a step, the moving velocity of the first light beam is calculated, and the moving velocity of the first light beam is controlled so that the moving velocity varies in conformity to a first velocity profile predetermined. Herein, the first velocity profile is pre-set to assist the first light beam in reaching a target track for the shortest time. At the next step, the position of the optical head is controlled so that the optical head follows the first light beam. At the next step, if the first light beam is accelerating or traveling at a constant velocity, the position of the second light beam is controlled so that the second light beam follows the optical head.