60results about "Recording by non-mechanical deformation" patented technology

Provided is a method for manufacturing a heat-assisted magnetic recording head, capable of joining a light source unit and a slider with a sufficiently high alignment accuracy. In the method, the unit including a light source is joined to the slider including a head part. First, at least one marker provided on the head-part end surface is set so that the distance from the waveguide incident center to the marker end is substantially equal to the distance from the light-emission center of the light source to the end surface of the light source. After that, the unit and slider are relatively moved while keeping the unit in surface contact with the slider, and the relative positions are set so that the end of the marker coincides with, or is at a distance within an acceptable range from, the edge of the surface of the light source.

A battery-operated recording medium controller monitors the ID of a replayed melody and when a replay ID comparing section (A126) makes a decision that a melody of the same ID as the previous one is replayed, a section (A127) for judging necessity of auxiliary information designates an auxiliary information access control section not to acquire auxiliary information (ID3 tag) again from a disc but to reuse auxiliary information stored in an auxiliary information storing section A. Consequently, the number of times of accessing the recording medium is decreased, and when the auxiliary information added to reproduction data like the ID3 tag of an MP3 is acquired, moving distance of an optical pickup is decreased and current consumption can be reduced.

A digital signal receiving apparatus is disclosed. The digital signal receiving apparatus includes a main signal discriminating unit configured to discriminate a main signal of a received signal, a monitor signal discriminating unit configured to discriminate a monitor signal of the received signal, an error monitoring unit configured to monitor a discriminating error of the monitor signal discriminating unit, and a discriminating point control unit configured to control the discriminating points of the main signal discriminating unit and the monitor signal discriminating unit. The discriminating point control unit monitors an output of the error monitoring unit, moves the discriminating point of the monitor signal discriminating unit in the amplitude directions and the phase directions such that a discriminating error occurs, detects a center of discriminating points where errors are generated, and sets the detected center of the discriminating points as the discriminating point of the main signal discriminating unit.

The object of the present invention is to realize reduction of the level jitter generated from a noise component at a signal saturation level or a waveform distortion in a portion except for signal polarity portions (rising edge and falling edge), and good error characteristics. In the present invention, a predetermined upper or lower limit value is set to reproduction signals, the reproduction signals are subjected to a limiter processing for correcting reproduction signals of the upper limit value or more, or the lower limit value or less to the level of the upper limit value or the lower limit value, respectively, the signal subjected to the limiter processing is subjected to a partial response equalizing (PR equalizing) processing, and PR reproduction is performed to improve the level jitter at PR detection time and the error rate at information reproduction time.

A method and system for magnetic recording using self-organized magnetic nanoparticles is disclosed. The method may include depositing surfactant coated nanoparticles on a substrate, wherein the surfactant coated nanoparticles represent first bits of recorded information. The surfactant coating is then removed from selected of the surfactant coated nanoparticles. The selected nanoparticles with their surfactant coating removed may then be designated to represent second bits of recorded information. The surfactant coated nanoparticles have a first saturation magnetic moment and the selected nanoparticles with the surfactant coating removed have a second saturation magnetic moment. Therefore, by selectively removing the surfactant coating from certain nanoparticles, a write operation for recording the first and second bits of information may be performed. A read operation may be carried out by detecting the different magnetic moments of the surfactant coated nanoparticles and the non-surfactant coated nanoparticles.

An optical recording medium includes a crystallizing layer for enhancing the crystallization of a phase change memory layer, an energy storage layer for aiding the state transformations of a phase change memory layer, and/or a modifying element for increasing absorption and contrast at short wavelengths. An optical data storage and retrieval system containing same. Also a light-plasmon coupling lens including an optically transparent substrate having a light incident surface and a light-plasmon coupling surface opposite the light incident surface. The light-plasmon coupling surface including at least a set of circular concentric peaks/valleys which form a Fourier sinusoidal pattern in the radial direction of the circular concentric peaks/valleys. A conformal layer of metal is deposited on the light-plasmon coupling surface of the substrate and has aperture at the center of thereof through which plasmons are transmitted.

The present invention relates to a method of writing information on an optical recording medium (10 to 38), the optical recording medium having at least one data layer (40) for storing data readable by use of an optical readout device and at least one label layer (42) for storing visible information, the method comprising the steps of: focusing a first wavelength laser beam (44 to 58) onto the at least one data layer for writing data on the data layer, and focusing a second wavelength laser beam (60 to 78) onto the at least one label layer for writing visible information on the label layer, thereby a laser spot size being usable that is also employable when using the second wavelength laser beam for writing data on a data layer for storing data readable by use of an optical readout device. The present invention further relates to an optical recording medium and to a method of manufacturing an optical recording medium.

A data writing method is used with an optical recording apparatus to write data into a rewritable disc. For writing data, the optical recording apparatus enters a writing mode and a first packet is written into the rewritable disc. Then, the optical recording apparatus enters a detecting mode and data of the first packet written into the rewritable disc are read for defect detection. If no defect of the first packet is detected in the detecting mode, the writing mode is entered again, so a second packet can be written into the rewritable disc. On the other hand, if a defect of the first packet is detected in the detecting mode, a rewriting mode will be entered and the first packet is rewritten into the rewritable disc again.

A method for restoring data stored along a data storage path on an optical disc (1) which is unreadable for conventional optical disc drives due to undesired chemical or physical changes within a recording layer (3) of the optical disc comprises the following steps:

• • detecting deformations (14) of a groove (6) extending along the data storage path, the deformations (15) being generated by a laser beam (7) during a recording process,
  • determining the data to be restored from the detected deformations (14) and lands (8′).

The invention relates to a method and a system for realizing data access by using transparent substances as carriers. The method and the system aim at solving the problems that in the prior art, the storage capacity is small, and the pollution and the damage can easily occur. The method comprises the following steps that: multilayer metamorphic dot matrixes are manufactured inside a transparent body through an internal manufacturing method not destroying an integral structure; and according to a dot matrix information reading method, space positions of the dot matrixes are read, and space distribution data of the dot matrixes is obtained. The internal manufacturing method not destroying the integral structure is an internal engraving method not destroying the integral structure; and the reading is the non-intrusive reading. The internal engraving method not destroying the integral structure is a laser internal engraving method; and the non-intrusive reading is perspective three-dimensional scanning. According to the laser internal engraving method, metamorphic dots including vaporization explosion dots or melting points are formed in the transparent body, and the perspective three-dimensional scanning is tomography. The manufacturing is burning; and the multilayer dot matrixes are layer-by-layer burning. The method and the system have the advantages that the storage capacity is great, the pollution resistance and the damage resistance can be realized, and the information storage and the information reading are convenient.

Read/write components for AFM-based data storage devices are provided. In particular embodiments, a read/write component (30, 45, 50, 65, 80) comprises lever means (31, 51, 66, 82) and a support structure (32, 52, 67, 81), the lever means being connected to the support structure for substantially pivotal movement. The lever means (31, 51, 66, 82) provides first and second current paths between a pair of electrical supply lines (R, C) on the support structure via which the lever means can be connected in use to power supply means operable in a write mode and a read mode. A write-mode heater (36, 47, 56, 73) is provided on the lever means in the first current path, and a read/write tip (37, 57, 74, 84) is provided on the write-mode heater. A read-mode heater (39, 46, 58, 75, 83) is provided on the lever means in the second current path. Decoupling means (38a, 38b, 40a, 40b, 60, 61, 77a, 77b, 78a, 78b) is arranged to inhibit current flow to the write-mode heater via the first current path in use when the power supply means is operated in the read mode. The component, with separate write and read-mode heaters, can thus be addressed in both the write and read modes via a single pair of supply lines. Other embodiments provide read/write components (100) employing a thermal decoupling mechanism, and read/write components (80) where read-sensing is performed by a proximity sensing arrangement between the lever means and the support structure. Sensing apparatus (115) for atomic force microscopes is also provided where tip movement can be detected via similar proximity sensing arrangements.

An optical disc cutting apparatus capable of suppressing an unnecessary deflection component and unnecessary light intensity variation component and manufacturing a optical disc suitable for a high definition, high precision and high density optical disc. The optical disc cutting apparatus includes a light beam controller including at least one of an optical modulator for controlling the light intensity of light beam emitted from a laser beam source and an optical deflector for controlling the deflection amount of the light beam in the radial direction on an optical disc original master, a deflection error detector for detecting a deflection error in the radial direction included in the light beams controlled by the light beam controller, a second optical deflector, which is disposed between the light beam controller and the deflection error detector, for deflecting the light beams in the radial direction, and a feedback controller for feeding back a feedback signal using the deflection error in the radial direction to the second optical deflector.