Abstract: It is an object of the present invention to provide an improved disc changer adapted to exactly detect whether a magazine storing a plurality of discs has been attached in the disc changer. When a magazine storing a plurality of discs is inserted into the disc changer, a detection arm and a lock arm both serving as moving members are moved by such an insertion. The lock arm, by virtue of the movement of itself, engages into an insertion groove provided on the backside of the inserted magazine and locks the magazine on the disc changer. The detection arm, by virtue of the movement of itself, actuates a lock detection switch. Here, since the detection arm and the lock arm are both urged by an urging spring, it becomes possible to exactly detect the attachment of the magazine by allowing the moving members locking the magazine on the disc changer to actuate the lock detection switch.

Abstract: It is an object of the present invention to provide an improved disc changer allowing correct attachment of a magazine into a magazine holder. In the disc changer of the invention, a plurality of restriction members are provided in the magazine holder which receives a magazine for arranging and storing a plurality of discs, located on the magazine holder's one surface facing the upper surface of the magazine received therein. Therefore, these restriction members can get into contact with the upper surface of the magazine being inserted into the magazine holder in an upwardly inclined state, thereby restricting the insertion direction of the magazine. In this way, the magazine with its insertion direction being restricted, can be attached into the magazine holder in a correct manner, without bringing about any undesired effect caused by both the drawing means and the disc storing position within the magazine on the positioning or the like in the disc arranging direction.

Abstract: A disc holder is annularly provided for holding a plurality of discs, and a reproducing device is provided in a central portion of the disc holder for reproducing a desired disc. A carrying device is provided for carrying the desired disc between the disc holder and the reproducing device. The carrying device has a groove for slidably engaging with a peripheral portion of the desired disc, and a pair of inclined surfaces for separating adjacent discs on both sides of the desired disc from the desired disc.

Abstract: An information record medium (1) is provided with: an audio information recording area on which a plurality of audio information (210) which are different in recording method are recorded; and a control information recording area on which control information (211) required to reproduce the plurality of audio information recorded on the audio information recording area is recorded. The control information recorded on the control information recording area includes identification information indicating that the plurality of audio information are same in content and different in recording method with each other. The control information may include a plurality of first division information for identifying first division units (260) respectively so as to divide each of the plurality of audio information recorded on the audio information recording area by the first division units respectively.

Abstract: An annular disc holder is provided for holding a plurality of discs. The disc holder is rotatably mounted on a base and is guided by a guiding device provided between the disc holder and the base so as to be rotated about an axis.

Abstract: A light emitting display device having a plurality of light emitting elements connected to intersecting points of a plurality of anode lines and cathode lines arranged in a matrix. Either one of the anode lines and the cathode lines are used as scanning lines, and the others are used as driving lines. While one of the scanning lines is scanned during a scanning period, a driving source is synchronously connected to one of the driving lines so that a light emitting element connected to an intersecting point of the one scanning line and the one driving line is caused to emit light. Immediately after the scanning period of the one scanning line is started, a first driving source is connected to the one driving line, and subsequently, in exchange for the first driving source, a second driving source is connected to the one driving line.

Abstract: An information recording apparatus for recording record information onto a record medium, on which (i) a plurality of information groups each comprising one series of the record information and (ii) management information including positional information indicating a recorded area of each of the information groups are recordable, is provided with: a detecting device for detecting the management information, which is recorded in advance on the record medium, from the record medium; a recording device for newly recording the record information onto the record medium; an outputting device for outputting an identification information to identify the information groups, which are recorded in advance on the record medium, on the basis of the detected management information while the recording device is newly recording the record information; a specifying device for specifying an erasable information from among the information groups which are identified by the outputted identification information while the recordin

Abstract: A liquid-crystal panel is placed in an optical path of an optical beam from a light source to a recording surface of a recording medium for compensating wavefront aberration of the optical beam by giving a phase difference to the optical beam. The liquid-crystal panel comprises a layer of a liquid crystal material having an index of birefringence, wherein the product of the index of birefringence and thickness of the layer of the liquid crystal material is 0.4 &mgr;m or more.

Abstract: A tracking controller capable of conducting a correct tracking control even if a recording track is formed with a narrow track pitch on a recording disk. The tracking controller calculates an error value between a read signal read from a recording track intended for reading and a predetermined value, a first coefficient from a correlation between a read signal read from a recording track adjacent to the recording track intended for reading on the inner peripheral side of the disk and the error value, and a second coefficient from a correlation between a read signal read a recording track adjacent to the recording track intended for reading on the outer peripheral side of the disk and the error value. A difference between the first and second coefficients is calculated as a tracking offset which is subtracted from a tracking error to correct a tracking offset.

Abstract: A waveform equalizer which can improve a quality of a read signal by certainly correcting asymmetry in the read signal and a data reproducing apparatus using the waveform equalizer. The waveform equalizer performs a waveform equalization to the read signal and is constructed by: inclination discriminating means for detecting an ascending slope portion and a descending slope portion of the read signal; a filter for performing a filtering process to the read signal; and characteristics switching means for switching frequency characteristics of the filter in accordance with a discrimination output of the inclination discriminating means.

Abstract: An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits.

Abstract: An information record medium (1: DVD) has a record track (1a) to be reproduced by an information reproducing apparatus (S2). The information reproducing apparatus is provided with a read device (80) and reproduces audio information by a predetermined audio frame unit while relatively moving the read device along the record track recorded with at least the audio information by the audio frame unit. A plurality of audio packets (43, 202) are arranged along the record track, in each of which audio information pieces (207) constructing the audio information sampled by a predetermined sampling frequency and audio control information (203) for controlling a reproduction of the audio information pieces by the information reproducing apparatus are respectively recorded.

Abstract: An information reproducing apparatus has a read device, is capable of reproducing sub picture information and is also capable of performing a highlight display of the sub picture information. In an information record medium to be reproduced by this reproducing apparatus, at least the sub picture information and reproduction control information to control a reproduction of the sub picture information are recorded on the record track such that the sub picture. information and the reproduction control information are divided into a plurality of groups. Each of the groups is a predetermined unit able to be accessed by the information reproducing apparatus, and has a sub picture pack in which the sub picture information is contained and a control pack in which the reproduction control information is contained.

Abstract: A liquid-crystal panel is placed in an optical path of an optical beam from a light source to a recording surface of a recording medium for compensating wavefront aberration of the optical beam by giving a phase difference to the optical beam. The liquid-crystal panel comprises a layer of a liquid crystal material having an index of birefringence, wherein the product of the index of birefringence and thickness of the layer of the liquid crystal material is 0.4 &mgr;m or more.

Abstract: A light emission display panel has a substrate, a plurality of first electrodes on the substrate, a light emission layer on the first electrodes, and a plurality of second electrodes. Each of the second electrodes has a form of a strip film in which partially overlapped portions are provided.

Abstract: A substrate of an optical disc is formed by injection molding. One of the surfaces of the substrate has a plurality of pits corresponding to information signals. The other surface has a plurality of dummy pits.

Abstract: A transmission interface unit in a transmission system wherein time series data is divided into data groups and a data packet comprising reproduction specification time data specifying the time at which each data piece in the data groups should be reproduced, added to the data groups is transmitted on a transmission bus in a time division manner. The reception interface unit has a cycle timer for counting the reference time of the home machine based on the reference time on the transmission bus, a generation section for generating the reproduction specification time data, an addition section for dividing the time series data into data groups, putting into packets, and adding the reproduction specification time data to the data in the packets, and a rewrite section for rewriting the reproduction specification time data.

Abstract: An apparatus for recording first information onto a recording medium, successively to second information that has been already recorded on the recording medium is provided. The first and second information are divided into a plurality of blocks. Each block includes a synchronization signal. This signal is located at a predetermined position in each block. A plurality of pre-pits are pre-formed on the recording medium at intervals of the predetermined length or an integer times the predetermined length. A reference signal with a predetermined frequency is pre-recorded on the recording medium.

Abstract: A writable optical disc has an information writing track, and a guiding track for introducing a laser beam to the information writing track. The guiding track has prepit information recorded thereon, the prepit information including at least address information of the optical disc. The prepit information is recorded on the guiding track at a position where interference of adjacent guiding tracks with the prepit information is prevented. The information writing track is a groove track, and the guiding track is a land track.

Abstract: An apparatus (C) manufactures an information record medium (DK), which has a track (G, L), on which information is optically recorded. The apparatus is provided with: a track forming device (40, 43, 50) for forming the track; and a transition portion forming device (40, 43, 50) for forming a transition portion (MG) for transiting an irradiation position (SP) of a light beam (LG, LL), which is used for illegally copying the information on the formed track, from an irradiation track (G2), which is irradiated by the light beam, to an adjacent track (G1), which is adjacent to the irradiation track and on which the information is recorded before the information is recorded on the irradiation track, such that the formed transition portion is continuous with the formed track.