Abstract: Provided is an orbiting memory capable of suppressing residual deviation even when a phase difference is caused between a signal to be compensated and information stored in a memory to be fed back and a disc device using the orbiting memory. The disc device includes: an adder to which a signal (s10) to be compensated and having a cyclic frequency component such as a control system error signal is inputted; and a feed back signal system for successively updating and storing an output signal of the adder for each cycle in a memory and inputting one-cycle information stored in the memory to the adder.

Abstract: There is provided an objective lens for information recording/reproducing for three types of optical discs, which includes a first area contributing to converging a third light beam onto a record surface of a third optical disc. The first area includes a phase shift structure having refractive surface zones concentrically formed about a predetermined axis. The phase shift structure includes first and second step groups. The first step group is configured such that an optical path length difference ?OPD1 (nm) given by each step of the first step group to a first light beam satisfies a condition: 2N1+1.10<|?OPD1/?1|<2N1+1.40, where N1 is an integer or zero, and the second step group is configured such that an optical path length difference ?OPD2 (nm) given by each step of the second step group to the first light beam satisfies a condition: 2N2?0.10<|?OPD2/?1|<2N2+0.10, where N2 is an integer.

Abstract: In an information processing apparatus that stores data on a plurality of storage media, a management information generator generates management information based on which to manage an order in which data is stored on the storage media, using storage medium identification information identifying each storage medium, and a multiplexer multiplexes the management information generated by the management information generator on the data. A storage unit stores the data, including the management information multiplexed by the multiplexer, on the storage media such that the data can be easily managed and the storage media can be used in a very convenient manner.

Abstract: An optical recording apparatus comprises: a focusing section that focuses to a transmission type recording medium a recording light beam including a signal light beam and a reference light beam which are radiated from a same direction with a common optical axis; and a focused-position moving section that moves with respect to a direction of the optical axis a focused position where the recording light beam is focused to the transmission type recording medium by the focusing section, wherein an interference fringe formed by the recording light beam is recorded in the transmission type recording medium at each position which is moved by the focused-position moving section.

Abstract: An optical head device includes a diffraction grating which diffracts a part of the light beam which is selectively emitted from a semiconductor laser having two luminous points and is divided along a tangential direction of the track of the optical disk, a relationship of arrangement of the second and third regions corresponds to a relationship of the optical axes of the first and second light beams on the diffraction grating, the second region is located at a position crossing an optical axis of the first light beam, a phase difference between phases of the first and third regions is 180°, a phase difference between phases of the third and fourth regions is 180°, and the third region has a width which is not larger than amount of a position deviation of ±first-order diffracted light of the second light beam from zeroth-order diffracted light.

Abstract: Exemplary embodiments are provided for recording and reading optical information using holography in which a first recording operation is performed in a first recording region in an overlapping manner by allowing a reference beam and a signal beam with data loaded to interfere with each other in the first recording region, the reference beam being angularly multiplexed at predetermined intervals. And a second recording operation is performed in a second recording region located adjacent to the first recording region or overlapped with the first recording region by allowing the reference beam and the signal beam to interfere with each other in the second recording region, the reference beam being angularly multiplexed between the predetermined intervals.

Abstract: In a particular embodiment, a recording head includes a tapered waveguide adapted to propagate light from a light source a slider adjacent to a surface of a storage medium. The tapered waveguide is adapted to output an elliptical beam to a grating coupler on a slider. The recording head further includes a slider waveguide extending substantially normal to a surface of the storage medium and a grating adapted to couple the elliptical beam into the slider waveguide.

Abstract: When record or reproduction quality of an optical disc is deteriorated, an enhancement in the performance is implemented by slowing down record or reproduction speed of the optical disc. However, there still exists a problem of how to select and determine a timing with which the speed is to be modified. In the present invention, the modification of the speed is performed with a seek processing selected and used as its trigger, and depending on various conditions at that time. Simultaneously, information recording area of the optical disc is separated into a plurality of zones. Then, when an optical pickup passes though a zone switching portion therebetween, the seek processing is inserted, thereby being used as the trigger for the speed modification.

Abstract: An optical disc recording method includes: determining that an optical disc to be recorded is an optical disc including a recording layer comprising organic dye; and controlling a laser such that space formation power Ps necessary for space formation is equal to or smaller than bias power Pbw. In a case wherein the relation of Ps<Pbw is satisfied, the relation between the asymmetry value, ? value, and main power Pw includes substantial linearity. Accordingly, control of the main power Pw can be performed with the asymmetry value and ? value as evaluation indexes, and accordingly, disturbance or the like can be readily handled.

Abstract: According to the present invention, when an apparatus performs reproduction from an optical disc of a format not compatible to the apparatus, the apparatus is prevented from obtaining an incorrect address and thus causing a malfunction. A recording method according to the present invention performs first conversion of bit-inverting m number (1?m<n; m an integer) of symbols at prescribed positions of a code word coded using an error correction code by a Reed-Solomon code and including symbol C(i) [i=0, 1, 2, . . . n; n is an integer] to generate conversion information; and records the conversion information on a first recording medium.

Abstract: A compact disc player and a method and an article of manufacture for controlling ejection of a compact disc are provided. The compact disc player includes a temperature sensor configured to generate a signal indicative of a temperature of the compact disc player utilizing a temperature sensor. The compact disc player further includes a controller operably communicating with the temperature sensor. The controller is configured to determine an ejection time interval value based on the signal. The controller is further configured to energize a motor coupled to a drive mechanism for a time internal corresponding to the ejection time interval value to induce the drive mechanism to move a compact disc to a predetermined position outwardly from a housing.

Abstract: An optical pickup apparatus comprising: a collimating lens configured to convert laser light emitted from a laser diode, from diffused light into parallel light; an objective lens; and a prism configured to guide the laser light emitted from the collimating lens to the objective lens, the prism including: a first face that the laser light emitted from the collimating lens enters; a second face that reflects the laser light entering the first face; and a third face that reflects the laser light reflected from the second face in a direction of the second face, and emits the laser light reflected again from the second face in a direction of the objective lens.

Abstract: An optical disc device includes a position detector which detects a position of the pickup in accordance with a output signal from the first light receiver of a position sensor which receives light from a encoder board, a rotation position detector which detects a rotation position of the disc in accordance a output signal from the second light receiver which receives a reflected light or a transmitted light of the light irradiated onto the variable area of the disc, and a controller which controls a recording dot marks on a label surface of the disc by driving a feed motor to move the pickup based on the rotation position detected by the rotation position detector and the position detected by the position detector and driving the pickup to control a intensity of the laser light in accordance with the rotation position detected by the rotation position detector.

Abstract: An optical disk apparatus includes a rotary driving unit rotating an optical disk which is flexible, an optical pickup irradiating light upon a recording surface of the optical disk on which writing/reading of information is performed, a stabilizing unit stabilizing vibration of the optical disk in a rotary axial direction by using pressure difference of air flow at least on a portion where writing/reading is performed, and being disposed on a side of the optical disk opposite to a side on which the recording surface is provided, and a control-adjustment unit analyzing a value of a tracking error signal of the optical disk obtained by scanning along a groove of the optical disk with use of the optical pickup, comparing the analyzed value of the tracking error signal of the optical disk and a value priorly obtained by scanning along a groove of a standard disk prepared beforehand, and adjusting a positional relation between the optical disk and the stabilizing member in a three dimensional space according to t

Abstract: A temperature sensor is disposed in an optical pickup to detect a temperature of an objective lens. An optical element (for example, a collimator lens) is driven according to a temperature change of the objective lens, which corrects deterioration of an optical characteristic of a laser beam passing through the objective lens. Good recording/reproduction is smoothly performed even if the optical characteristic of the objective lens is changed with the temperature change.

Abstract: An optical pickup device includes a photodetector which receives laser light reflected on a recording medium, and an optical system which guides laser light to the photodetector as convergent light. A light transmitting plate which imparts astigmatism to the laser light is disposed between the optical system and the photodetector with an inclination with respect to an optical axis of the laser light. The optical pickup device further includes an optical element which separates four light fluxes of the laser light from each other. The four light fluxes are obtained by dividing the laser light by two straight lines respectively in parallel to a first focal line direction of the laser light transmitted through the light transmitting plate, and a second focal line direction orthogonal to the first focal line direction.

Abstract: The present invention is related to a method and a reading device (1) for retrieving information from an optical record carrier (10) in which the read power level of a radiation beam (3) for scanning the optical record carrier is set in dependence on the read-out speed. The invention is also related to a record carrier for use with such a method and a reading device.

Abstract: A planar bidirectional tape head with planar read and write elements for reading and writing data on a magnetic recording tape includes a substrate, a tape bearing surface for engaging the magnetic tape, one or more write element arrays formed on the substrate, and one or more read element arrays formed on the substrate. The one or more write element arrays and the one or more read element arrays comprise plural thin film layers oriented in generally parallel relationship with the tape bearing surface.

Abstract: The present invention makes it possible to reproduce reproduction images without a break without having to use any additional identification information even when real-time recorded data is not completely continuous. A control circuit references a data identification flag (“Recording Type”) which is attached to each sector of reproduction data to indicate the type of recorded data, and counts the number of sectors to which the data identification flag representing real-time recorded data is attached. When the count is not smaller than a threshold value, the control circuit reproduces all the sectors of the target reproduction block in a real-time reproduction mode. In the real-time reproduction mode, the control circuit masks a portion of reproduction data that is found to be defective, changes the value of the defective data to 0 (zero), and transfers the resulting reproduction data to a host device.

Abstract: An optical information recording medium of the present invention, a reproduction method using the optical information recording medium, and an optical information processing device using the optical information recording medium, each of which optically reproduces recorded information by irradiating a light beam, include: a substrate on which a bumpy pit and/or groove corresponding to the recorded information or a recording layer is formed; and a temperature responsive layer whose optical property (transmissivity) in a wavelength of the light beam varies in response to temperature rise caused by irradiation of the light beam. The optical information recording medium can surely reproduce information, which has been recorded in a high density manner, with high accuracy.