Abstract: A signal compensating apparatus is an apparatus for compensating a control signal which is generated on the basis of a light beam reflected by an optical recording medium and which includes information with respect to a relationship between a spot of the light beam and a track of the optical recording medium. The signal compensating apparatus has: a detecting device for detecting a damaged part of the control signal, which is caused by a defect of the optical recording medium or an obstruction existing on an optical path of the light beam or on the optical recording medium; a replacing signal generating device for generating a replacing signal whose level gradually varies so as to connect a level of a first normal part of the control signal immediately before the damaged part with a level of a second normal part of the control signal immediately after the damage part; and a replacing device for replacing the damaged part by the replacing signal.

Abstract: An electron emission device based flat panel display apparatus is composed of a pair of a back substrate and an optically transparent front substrate opposing to each other with a vacuum space interposed therebetween, and a plurality of electron emission devices, each of which includes an electron-supply layer made of metal or semiconductor, formed on ohmic electrodes formed on a surface of the back substrate proximate to the vacuum space, an insulator layer formed on the electron-supply layer, and a thin-film metal electrode formed on the insulator layer and facing the vacuum space. The front substrate includes collector electrodes formed on its surface proximate to the vacuum space, fluorescent material layers formed on the collector electrodes, and an image display array composed of a plurality of light emitting elements corresponding to the fluorescent material layers.

Abstract: A focusing control apparatus is designed to perform a focus jumping operation successfully. The apparatus has reading device which irradiates read light to a recording medium 1 having information recording surfaces formed on at least two layers, respectively, receiving return light of the read light from the recording medium, and generating a read signal; and control device which executes a focus jumping process to generate a drive signal of a focusing actuator to move an optimum light converging position of the read light from one of the recording surfaces to the other based on a focusing error signal that is generated based on the return light. The apparatus further has drop-out detecting device which detects a drop-out of the read signal and vibration detecting device which detects a vibration of the recording medium or reading device.

Abstract: A plasma display panel has a pair of substrates including a display side substrate and a back side substrate, a pair of opposed row electrodes disposed inside the display side substrate interposing a discharge gap, each of the row electrodes comprising a transparent conductive film and a metallic film formed on the transparent conductive film at a position opposite to the discharge gap, a dielectric layer covering the row electrodes. The dielectric layer includes a first dielectric layer formed on the inner surface of the display side substrate, a second dielectric layer formed on the first dielectric layer except the discharge gap and a third dielectric layer formed on the first and second dielectric layers.

Abstract: Disclosed is a driving apparatus for a plasma display panel comprising a group of pairs of row electrodes divided into a plurality of sub-blocks, and a driving pulse generator provided in each sub-block for supplying a driving pulse to the associated sub-block, thereby eliminating non-uniform luminance distribution on the display surface due to variations in voltage of pulses supplied to row electrode in the respective sub-blocks. Output terminals of the pulse generators in the respective sub-blocks are connected to each other to make the voltage levels of at least sustain pulses constant.

Abstract: The CATV system includes a center device and a plurality of terminal devices. The center device sends downstream timeslots, to the terminal devices, including upstream timeslots occupancy information and collision information. Upstream timeslot occupancy information indicates whether or not an upstream timeslot corresponding to the downstream timeslot is vacant, and collision information indicates whether or not a collision has occurred. The terminal device receives the downstream timeslot, checks upstream timeslot occupancy information to detect upstream timeslot in the vacant state, and sends upstream data to the center device via the vacant upstream timeslot. If the upstream timeslot makes a collision, the center device detects it and sends a downstream timeslot which includes collision information indicative of the occurrence of the collision. The user of the terminal device recognizes the collision having occurred or not by referring to the collision information.

Abstract: An information recording apparatus includes: a unit for applying a predetermined processing to record information divided into error correction units and generating processed record information including a plurality of record units; and a unit for recording the processed record information on an information record medium; a unit for recording, after the recording of the processed record information, predetermined dummy information of an information amount corresponding for the plurality of record units, on the information record medium, subsequent to the processed record information recorded.

Abstract: An information recording apparatus (SS1) is provided with: a signal process device (72) for applying a predetermined signal process to record information (R), which is to be recorded onto an information record medium (1: DVD) and is inputted from the external, to output processed record information (Sr), and for dividing control information (Si), which corresponds to the record information and is inputted from the external, into search control information (Sdsi, DSI), which is information to search a record position of the record information to be reproduced at a time of reproducing the record information, and reproduction display control information (Spci, PCI), which is information to control a reproduced display of the record information at the time of reproducing the record information, to output the search control information and the reproduction display control information; a multiplex device (75, 76) for multiplexing the processed record information, the search control information and the reproduction

Abstract: A tilt detecting method which can accurately detect a tilt occurring between a recording disk and a pickup by a construction of a small scale. The reading position of the pickup for the center recording track among the three adjacent recording tracks formed on the recording surface of the recording disk is set to a reference. The tilt between the recording disk and the pickup is detected based on a differential value between a crosstalk from each of the positions which are displaced forward and rearward from the reading position on the recording track that is neighboring on the disk's outer rim side of the center recording track by a predetermined distance in the reading direction to the reading position and a crosstalk from each of the positions which are displaced forward and rearward from the reading position on the recording track that is neighboring on the disk's inner rim side by a predetermined distance in the reading direction to the reading position.

Abstract: A movable member is slidably mounted on a fixed member so as to be moved in a predetermined direction, and a linear sensor is attached to the fixed member, a slider is slidably mounted on the linear sensor so as to be moved in the predetermine direction. A fixed rack is attached to the fixed member, and a movable rack is slidably mounted on the fixed member and connected to the movable member so as to be moved in the predetermined direction. A first gear is pivotally mounted on the slider and engaged with the fixed rack and movable rack.

Abstract: A focus control apparatus for a multilayer optical recording medium performs an adequate focus jump on a multilayer optical recording medium. Threshold values are set according to the amount of a level change in a focus error signal of a loaded multilayer optical recording medium, and focus jump control is conducted based on the result of comparison between the level of the focus error signal and the set threshold values.

Abstract: An aberration correcting apparatus is provided with: a light detection device for irradiating an information record medium, on which record information is recorded, with a light beam, and outputting a light detection signal corresponding to the record information on the basis of a reflection light of the light beam reflected from the information record medium; a tilt detection device for detecting a tilt between an information record surface of the information record medium and an optical axis of the light beam on the basis of the light detection signal; a correction device for correcting a wavefront aberration generated in the light beam due to the tilt; and a driving device for driving the correction device on the basis of the detected tilt.

Abstract: A recording power control device is capable of optimizing the recording power of a recording optical beam at every recording position on a DVD-R (recordable) disk while an optical disk drive is recording information on the DVD-R disk with the recording optical beam. Simultaneously with the recording optical beam, the disk drive emits an adjusting optical beam behind the recording optical beam in the direction in which information is recorded. The disk drive has a first photodetector for receiving the reflected recording optical beam and a second photodetector for receiving the reflected adjusting optical beam. The recording power control device is equipped with a laser drive circuit for setting the recording power of the recording optical beam according to an output signal from the second photodetector, which receives the reflected adjusting optical beam.

Abstract: An apparatus for superposing a digital watermark for superposing digital watermark information on an information data signal bearing original information, superposes digital watermark information on an information data signal bearing original information, for each unit block consisting of a group of pieces of information data. This apparatus is provided with an auxiliary embedding circuit 10 for embedding second digital watermark information in the information data; a blocking circuit 12 for dividing into the unit blocks the changed information data signal obtained by the auxiliary embedding circuit; and a main embedding circuit 20 for embedding first digital watermark information in the changed information data signal for each of the divided blocks. The second digital watermark information bears information for identifying the position of the divided unit block in a predetermined section of the information data signal.

Abstract: An apparatus for reproducing a multiple layer disk, which comprising a plurality of layers each having an information record surface on which record information is recorded, is provided with: a read device for reading the record information from each of the layers; a reproduction process device for applying a predetermined reproduction process to the record information read by the read device in accordance with a reproduction process parameter, which is set therein and which comprises at least one of a gain value and an equalizer value, to thereby output a reproduction information signal; a drive device for driving the read device to jump from one reading state for reading one of the layers to another reading state for reading another of the layers; a memory for storing a plurality of reproduction process parameters corresponding to the layers in advance of reproduction; and a set device for reading out one of the stored reproduction process parameters, corresponding to another of the layers as a destination

Abstract: An information record medium (1: DVD) has a record track recorded with record information to be reproduced by an information reproducing apparatus (S2). The information reproducing apparatus is provided with a read device (80), and performs a reproduction while moving the read device along the record track at a predetermined reading linear velocity. The record information is divided into a plurality of first data groups (30: VOBU), each of which is a unit able to be accessed by the information reproducing apparatus, recorded on the record track. Lowest reading rate information (212) indicates a minimum requirement of a reading rate for the information reproducing apparatus to reproduce a reproduction unit, which comprises at least one of the first data groups and which is to be reproduced by the information reproducing apparatus such that a sequential logical meaning of the reproduction unit is continuous.

Abstract: In a plasma display panel, studs or second ribs are provided on the inner surface of a back side substrate. Each stud faces an edge portion of the associated one of projecting portions of the associated one of pairs of row electrodes far from a discharge gap therebetween and faces the associated one of body portions of the associated pair of row electrodes in the vicinity of the associated projecting portion. The studs are designed to be in contact with the dielectric layer.

Abstract: A loudspeaker has a frame, a magnetic circuit formed on the frame, a voice coil bobbin disposed in a magnetic gap of the magnetic circuit, and a diaphragm connected to the voice coil bobbin at an inner periphery and to the frame at an outer periphery thereof. The diaphragm is folded at a position between the inner and outer peripheries to form an annular ridge. The ridge is projected in an axially inner direction of the loudspeaker.

Abstract: A wavelength converting device for converting a wavelength of a light is provided. The wavelength control device including: a waveguide layer for guiding the light; a substrate having a lattice constant is different from a lattice constant of the waveguide layer; and a buffer layer which is disposed between the waveguide layer and the substrate and which has a lattice constant between the lattice constant of the waveguide layer and the lattice constant of the substrate.

Abstract: A disk player has a disk cartridge for being loaded thereon, and accommodating a disk-type recording medium. The disk cartridge has a shutter arranged thereon, for performing slide-opening/closing in order to expose an information surface of the disk-type recording medium. The disk player is comprised of a carrier mechanism for carrying the disk cartridge to an information regenerating location and an information recording location, and a shutter sliding mechanism for slide-opening/closing the shutter. The shutter assumes an intermediate position of sliding when the disk cartridge is located at one of the information regenerating location and the information recording location, and assumes a terminal position of sliding when the shutter is located at the other one of the locations. The disk player also includes a driving mechanism comprised of an engaging element and an engaged element which is separated from the engaging element when the information recording mechanism is not driven.