45results about "Track shape" patented technology

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. The rotation of the optical recording medium is controlled by the wobbled signals detected from the groove and the position on the optical recording medium of the recording signal is detected by the pit signal detected from the pits.

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. The rotation of the optical recording medium is controlled by the wobbled signals detected from the groove and the position on the optical recording medium of the recording signal is detected by the pit signal detected from the pits.

The rewritable data storage medium (1) has a rewritable recording layer (9) provided with a tracking structure (8). Said layer (9) has a data recording area (5). An erasable identification mark is present in an identification mark area (4, 4′) other than the data recording area (5). The data recording area (5) has a first tracking structure (8′), whereas the identification mark area (4, 4′) is substantially free from a tracking structure or has a second tracking structure (8″) substantially different from the first tracking structure (8′).Thus erasure of the identification mark is practically impossible, because the location of the erasing spot of a recorder cannot be controlled precisely in radial direction.

A record carrier has substantially parallel tracks having first variations of a first physical parameter and second variations of a second physical parameter of the track. The first variations represent information recorded on the record carrier, this information being recoverable by a controllable type of data processing. A modulation pattern of the second variations represents a code for controlling the type of data processing. In respect of a code track that includes the modulation pattern, the modulation pattern in the left neighboring track is aligned to the modulation pattern in the right neighboring track. Thereby crosstalk due to the second variations is decreased, and at least two tracks have the same modulation pattern. The playback device has a demodulator (50) and a control unit (56) for retrieving the code from at least two tracks.

The present invention provides an optical disc recording method of irradiating an optical beam to an optical disc including a basal plate made of synthetic resin which has a concavo-convex pattern formed in advance on one surface thereof, and a reflective coat made of metal which is formed over the concavo-convex pattern on the basal plate, to physically change the concavo-convex pattern so as to record identification data.

A write-once type information recording medium according to one aspect of the present disclosure includes at least one recording layer. In the information recording medium, the at least one recording layer has a spiral shape in which a land track and a groove track are alternately arranged as a recording track, the recording track is divided into blocks each of which being minimum unit in which recording is performed, and the information recording medium includes a management information area where management information is recorded and a user data area where user data is recorded. Each of the management information areas of both the land track and the groove track on each recording layer of the at least one recording layer is disposed at a same distance from the center of the information recording medium.

An optical disc medium includes a land and a groove at which information can be recorded. A predetermined number of address information units which record address information of the land or groove are provided in a circumferential direction of the optical disc medium. The address information unit of the land includes three or more address recording areas capable of recording address information. The address information is recorded on one area selected from among the three or more address recording areas. The address information unit of the land has address information which is recorded, in the same modulation, on the side of the inner adjacent groove and on the side of the outer adjacent groove. The one area to be selected from among the three or more address recording areas for recording the address information of the land is different among three address information units adjacently arranged in a radial direction.

An optical disc medium includes a land and a groove at which information can be recorded. A predetermined number of address information units which record address information of the land or groove are provided in a circumferential direction of the optical disc medium. The address information unit of the land includes three or more address recording areas capable of recording address information. The address information is recorded on one area selected from among the three or more address recording areas. The address information unit of the land has address information which is recorded, in the same modulation, on the side of the inner adjacent groove and on the side of the outer adjacent groove. The one area to be selected from among the three or more address recording areas for recording the address information of the land is different among three address information units adjacently arranged in a radial direction.

An optical disc medium includes a land and a groove at which information can be recorded. A predetermined number of address information units which record address information of the land or groove are provided in a circumferential direction of the optical disc medium. The address information unit of the land includes three or more address recording areas capable of recording address information. The address information is recorded on one area selected from among the three or more address recording areas. The address information unit of the land has address information which is recorded, in the same modulation, on the side of the inner adjacent groove and on the side of the outer adjacent groove. The one area to be selected from among the three or more address recording areas for recording the address information of the land is different among three address information units adjacently arranged in a radial direction.

The invention refers to an optical information recording medium and an optical information recording medium playback apparatus. The invention discloses the optical information recording medium operated by CAV or zone CAV, wherein a groove that wobbles is formed in advance, and information is recorded in the groove and a land adjacent to the groove, an address is recorded by a wobble signal of the groove, the groove is alternately provided with a first section recording an address N by the wobble signal, and a second section recording an address (N-1) or (N+1) by the wobble signal, in two groove tracks sandwiching a land track, the first section of one of the groove tracks matches the second section of the other of the groove tracks, and an address of the groove is read from the first section, and an address of the land is read from the first and the second sections located on both sides of the land track, and recording a same address.

In the land-groove method, wobble interference is reduced. STW modulation is used as wobble modulation for a part where wobble interference can occur, for example, a part where the configurations of both side walls of the groove are not the same and groove width modulation is unavoidable. Thereby, the amplitude of the groove width modulation can be suppressed to a quarter of that when BPSK modulation is used.

An optical recording medium having a wobble desirably arranged in a production process when having wobble at part of interfaces of lands and grooves is provided. An optical recording medium comprising an approximately disk-shaped disk substrate 15, formed in its surface with trenches 15a and having projections and recesses divided for every track region by the trenches 15a, on which are stacked an optical recording layer 16 having relief shapes corresponding with the trenches 15a and a protection film 17 and of a format where both regions of the projections (lands L) and the recesses (grooves G) are used as recording regions etc., wherein wobble W for providing clock information or address information is formed, between a pair of facing side walls forming each trench 15a, in a side wall portion at an inner circumferential side of the disk substrate 15 when seen from the recess (groove G) and at an outer circumferential side of the disk substrate 15 when seen from the projection (land L).

An optical disc is provided having marks for dispersed addresses that can be easily detected with high precision. A dispersed address includes synchronization marks, positive marks, and negative marks. The synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.

A phase error detector includes a sine wave generation circuit that generates a sine wave signal, based on a first input signal of a first period, a cosine wave generation circuit that generates a cosine wave signal, based on the first input signal, a first calculator that calculates a phase difference between the sine wave signal and a second input signal of a second period, a second calculator that calculates a phase difference between the cosine wave signal and the second input signal, and a first selection unit that outputs the phase difference calculated by the first calculator when the phase difference calculated by the second calculator is within a predetermined range, and outputs a predetermined value having a same sign as a sign of the phase difference calculated by the first calculator when the phase difference calculated by the second calculator is out of the predetermined range.

An optical disc and an optical disc drive for the optical disc are provided which are suitable for recording data with a high density. The optical disc D uses both lands and grooves as recording tracks. Each of the tracks consists of one address segment and forty five data segments. The address segment is wobbled at one side thereof. Each of the data segments is a DC groove. The address segment records an address information including a sync signal, frame address, track address and CRC, a tilt pattern and a clock mark. The clock mark is adapted to reflect laser beam in one amount before the mark and in another amount after the mark. The tilt pattern has a different track pitch from those in other areas. The data segments record data magneto-optically.

A track of an optical disk is formed by wobbling and divided into zones, a clock ratio of a recording clock to a wobble clock is preset for each zone, a wobble signal is detected from the optical disk, the wobble clock is generated from the wobble signal, a present position is identified by reproducing ADIP indicating a position of the track from the wobble signal and the wobble clock, the recording clock is generated with respect to the wobble clock, a data address present position is identified from the present position, a start end position of the ADIP in a recording target zone, a start end position of the data address in the recording target zone, and the clock ratio, a recording start position is identified based on the data address present position; and the data is recorded from the recording start position of the recording target zone.

An optical information recording medium on which recording address information is performed by a CAV or a zone CAV system, wherein a groove wobbling continuously is formed in advance to record the information to the groove and a land abutting the groove, the address information is recorded by a wobble where a plurality of modulated waves modulated by the address information are multiply formed, the modulated wave is a higher harmonic wave whose frequency is a fundamental wave of the fundamental frequency of the wobble, or an integer times the fundamental frequency of the wobble, one modulated wave is modulated by the address information of one land of the abutting lands which interpose the groove, and the other modulated wave is modulated by the address information of the other land of the abutting lands which interpose the groove.

An apparatus for recording user data to and / or reproducing user data from an optical disc, the apparatus comprising an optical head for directing a laser beam having a wavelength of about 680 nm or less to the optical disc, the optical head having about Objectives with numerical apertures of 0.7 or greater and working distances of 560 μm or less. By utilizing such devices, a relatively large amount of data can be recorded onto an optical disc.

A playback apparatus (20) includes a transducer unit (20A, 20B, 20C) for scanning a record carrier (1). The transducer unit is adapted to detect first variations and second variations. The apparatus further includes a first recovery unit (22) coupled to the transducer unit for recovering a clock signal (CL) from the first variations and a second recovery unit (23) coupled to the transducer unit for recovering an information signal (S<out>) from the first variations. The apparatus further includes a detection unit (24) for detecting whether said second variations exhibit a predetermined variation pattern on the basis of at least one signal (SA) originating from said transducer unit. The detection unit (24) using said clock signal (CL) generated by the first recovery unit (22) for detection. Further an enabling unit (5) is included for enabling said second recovery unit (23) to recover the information signal (S<out>) when said detection unit detects (24) said predetermined variation pattern.

An optical information recording medium of a CAV or a zone CAV, in which a groove wobbling continuously is formed in advance so as to record information to a groove and a land abutting the groove, the groove alternately has a first wobble position in which a wobble fundamental wave form has been modulated by groove address information, and a second wobble position of the wobble fundamental wave form, and in grooves of both sides by which the land is interposed, the first wobble position and the second wobble position are different from each other in position.

The rewritable data storage medium (1) has a rewritable recording layer (9) provided with a tracking structure (8). Said layer (9) has a data recording area (5). An erasable identification mark is present in an identification mark area (4, 4') other than the data recording area (5). The data recording area (5) has a first tracking structure (8'), whereas the identification mark area (4, 4') is substantially free from a tracking structure or has a second tracking structure (8') substantially different from the first tracking structure (8'). Thus erasure of the identification mark is practically impossible, because the location of the erasing spot of a recorder cannot be controlled precisely in radial direction.

In at least one embodiment, an optical data storage tape is provided. The optical data storage tape includes a read / write data area including a plurality of writeable tracks for storing data thereon,each writeable track having a first track width. The optical data storage tape further includes a seam area positioned proximate to the read / write data area. The seam area comprises a plurality of non-writeable tracks, each non-writeable track including a second track width that is greater than the first track width for each writeable track.

Physical addresses of the recording areas provided on an optical disc are represented in the first format that is time-axis data and the second format that is binary data. The physical address value gradually increases from the inner most part toward the outermost part of this disc, while the first format and the second format remains in one-to-one correspondence over the entire recording areas. The distance the optical head must move to reach the target recording area can therefore be calculated easily, no matter where on the disc the optical head is located at present. This enables the optical head to make a fast access to the target recording area.