Abstract: In step S1, the address generator generates address information composed of a sync signal which is recorded on an optical disc, address data and an error correction code for the address data, pre-encodes and supplies it to a modulator. At the same time, a carrier signal generator generates a carrier signal which is to carry the address information, and supplies it to the modulator. In step S2, the modulator makes MSK modulation of the carrier signal supplied from the carrier signal generator on the basis of the pre-encoded address information supplied from the address generator, and supplies a resultant MSK modulation signal to a wobbling unit. In step S3, the wobbling unit forms, on the optical disc, a spiral groove wobbled adaptively to the MSK modulation signal supplied from the modulator. In this optical disc, a given address can be accessed quickly and accurately.

Abstract: There is provided an optical disc having preformed thereon a spiral wobbled track as a grove and/or land along with data is to be recorded. The track is wobbled for a series of predetermined signal units each composed of an FSK information bit part based on a waveform resulted from FSK modulation of information bit and a singe-frequency part based on a waveform of a single frequency. The FSK modulation uses two different frequencies of which the one is the same as the single frequency and the other is different from the single frequency. These different frequencies are in such a relation that each of them has an even number of wobbles and an odd number of wobbles alternately in a predetermined cycle.

Abstract: There is provided an optical disc having preformed thereon a spiral wobbled track as a grove and/or land along with data is to be recorded. The track is wobbled for a series of predetermined signal units each composed of an FSK information bit part based on a waveform resulted from FSK modulation of information bit and a singe-frequency part based on a waveform of a single frequency. The FSK modulation uses two different frequencies of which the one is the same as the single frequency and the other is different from the single frequency. These different frequencies are in such a relation that each of them has an even number of wobbles and an odd number of wobbles alternately in a predetermined cycle.

Abstract: There is provided an optical disc having preformed thereon a spiral wobbled track as a grove and/or land along with data is to be recorded. The track is wobbled for a series of predetermined signal units each composed of an FSK information bit part based on a waveform resulted from FSK modulation of information bit and a singe-frequency part based on a waveform of a single frequency. The FSK modulation uses two different frequencies of which the one is the same as the single frequency and the other is different from the single frequency. These different frequencies are in such a relation that each of them has an even number of wobbles and an odd number of wobbles alternately in a predetermined cycle.

Abstract: In step S1, the address generator generates address information composed of a sync signal which is recorded on an optical disc, address data and an error correction code for the address data, pre-encodes and supplies it to a modulator. At the same time, a carrier signal generator generates a carrier signal which is to carry the address information, and supplies it to the modulator. In step S2, the modulator makes MSK modulation of the carrier signal supplied from the carrier signal generator on the basis of the pre-encoded address information supplied from the address generator, and supplies a resultant MSK modulation signal to a wobbling unit. In step S3, the wobbling unit forms, on the optical disc, a spiral groove wobbled adaptively to the MSK modulation signal supplied from the modulator. In this optical disc, a given address can be accessed quickly and accurately.

Abstract: An optical recording medium in which at least a reflection film and a protective film are laminated in succession on a substrate, and light is irradiated from the protective film side for the reproduction of information signals, wherein grooves or emboss pits corresponding to information signals are formed along tracks on the reflection film.

Abstract: Disclosed are an optical disk recording and reproducing apparatus, a remote controller, and a content management method capable of allowing a user to easily confirm contents recorded on an optical disk, wherein an optical disk is integrally provided with a read-only RFID tag that records only a disk ID to identify the optical disk as an individual. When a content is recorded on the optical disk, a video recorder records disk management information including the disk ID of the optical disk and index information about the content. After the content is recorded, a remote controller noncontactly reads the disk ID from the RFID tag of the optical disk and transmits the disk ID to the video recorder. The video recorder extracts index information corresponding to the received disk ID from the disk management information and displays the index information in a list.

Abstract: During recording operations, decay processing is performed with regard to reflected light information signals (I1 and I2) during periods wherein the laser output is recording power which is comparatively high level, i.e., wherein data pits are being formed on the disk, and during recording operations, decay processing is not performed with regard to reflected light information signals during periods wherein the laser output is reproducing power which is comparatively low level, i.e., wherein the pits are not being formed on the disk. Accordingly, address information can be extracted in a stable manner while recording.

Abstract: A recording apparatus includes an optical head recording information by irradiating laser light onto an optical recording medium; a laser power control circuit controlling the power of laser light output from the optical head on the basis of a target value of laser power and a monitor signal of the laser power detected by the optical head; and a target-value varying circuit detecting amplitude variations of a light quantity signal of return light of the laser light irradiated onto the optical recording medium and varying the target value on the basis of the amount of the detected amplitude variations.

Abstract: 1 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: A disk drive device capable of satisfactorily detecting address information recorded by land prepits even after data is recorded is provided. When address information recorded by land prepits is detected from a disk on which lands and grooves as recording tracks are formed and address information is recorded as land prepits on the lands, a window signal is generated by binarizing a push-pull signal (window generation circuit 31), the push-pull signal is integrated in a period based on the window signal (integration circuit 32), and the address information by the land prepits is extracted from the integrated signal (33, 34, 35, and 26).

Abstract: An optical reading unit which ensures that address information recorded as guide groove wobbles on an optical recording medium is easily played back. A light-receiving device (20) for detecting returning light from the optical recording medium has detection areas (21A to D) delimited by a plurality of split lines (22), (23), and (24). The position of one of the split lines functioning as a detection reference line is changed according to the position of a returning light spot S on a light-receiving surface (21) of the light-receiving device (20) and push-pull signals (PP1 to 3) are acquired by calculating the difference between signals received on two detection areas delimited by the split line to eliminate common-mode components.

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 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: The present invention is directed to an optical recording medium (1) adapted so that at least a reflection film (3), and a protective film (4) are laminated in succession on a substrate (2), and light is irradiated from the protective film (4) side so that reproduction of information signals is carried out, wherein grooves (5) or emboss pits (6) corresponding to information signals are formed along tracks at the reflection film (3).

Abstract: There is provided an optical disc having preformed thereon a spiral wobbled track as a grove and/or land along with data is to be recorded. The track is wobbled for a series of predetermined signal units each composed of an FSK information bit part based on a waveform resulted from FSK modulation of information bit and a singe-frequency part based on a waveform of a single frequency. The FSK modulation uses two different frequencies of which the one is the same as the single frequency and the other is different from the single frequency. These different frequencies are in such a relation that each of them has an even number of wobbles and an odd number of wobbles alternately in a predetermined cycle.

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: A record carrier is described that has a servo track (4) indicating an information track (9) intended for recording information blocks. The servo track (4) has a periodic variation of a physical parameter at a predetermined frequency and modulated parts for encoding position information at regular intervals. The modulated parts start with a bit sync element and are of a data type having a data bit element or of a word sync type having a word sync element. The bit sync element, word sync element and the data bit element being modulated according to a same predetermined type of modulation of the periodic variation. The distances between all elements constituting the modulated parts are unique. Further a device for reading and/or writing the record carrier is described.

Abstract: In step S1, the address generator generates address information composed of a sync signal which is recorded on an optical disc, address data and an error correction code for the address data, pre-encodes and supplies it to a modulator. At the same time, a carrier signal generator generates a carrier signal which is to carry the address information, and supplies it to the modulator. In step S2, the modulator makes MSK modulation of the carrier signal supplied from the carrier signal generator on the basis of the pre-encoded address information supplied from the address generator, and supplies a resultant MSK modulation signal to a wobbling unit. In step S3, the wobbling unit forms, on the optical disc, a spiral groove wobbled adaptively to the MSK modulation signal supplied from the modulator. In this optical disc, a given address can be accessed quickly and accurately.

Abstract: A laser drive circuit for generating level drive currents corresponding to three or more types of laser powers have first to third signal generation circuits 110, 120, and 130 and a signal composing circuit 140. The first signal generation circuit 110 detects the output level of a semiconductor laser 50 at present by referring to a light reception signal Vp detected at a light receiving element 51 and generates a first drive current Ib corresponding to the bias power. The second signal generation circuit 120 generates a differential current Ibe smaller than the second drive current corresponding to the erase power by exactly the first drive current. The third signal generation circuit 130 generates a proportional current Ibw obtained by multiplying a differential current Ibe by a predetermined multiple. This multiple is defined by (write power-bias power)/(erase power-bias power).