Abstract:
The optical disc comprises a substrate layer and a data layer disposed on the substrate layer, the data layer having a mark/space data structure arranged in tracks (T1-T6) which are arranged in groups (G1, G2) being separated each by a land section (L). The tracks of the groups (G1, G2) are each arranged as a spiral (S1, S2), and the start (A) of a track (T4) of a consecutive group (G2) begins at a position corresponding with the end (E) of a track (T3) of a preceding group (G1). A group (G1, G2) comprises advantageously an inner track, a center track and an outer track. The optical disc comprises in a preferred embodiment a nonlinear layer with a super-resolution structure and the track pitch (TP) between neighboring tracks (T1, T2) within a group is below the diffraction limit of a corresponding pickup for reading of data. Further, a tracking method is described which does not rely on tracking offsets to detect the inner and outer tracks of a group.
Abstract:
Storage medium for optical data and optical data disc A storage medium for optical data according to the invention comprises a substrate (S) and an active layer (A). The storage medium further comprises, opposite to the light incident side of the active layer (A), a reflective layer (R). According to the invention at least one of the reflective layer and a separate layer is generated as a thermal focusing layer (T), which has a strongly decreasing thermal conductivity with increasing temperature.
Abstract:
The invention relates to a method for storing data in a prerecorded area of an optical recording medium, and to an optical recording medium having at least one prerecorded area in which data is stored according to the method.It is an object to propose a method for storing data in a prerecorded area of an optical recording medium using pits (6) and lands ( 7), whereby the signal obtained from the pits ( 6) and lands (7) is compatible with a high frequency modulated groove signal.According to the invention, the pits ( 6) and lands( 7) adjacent to bit cell signal transitions( 1, 2, 3, 4) are arranged in a predefined manner, either in a fixed recurring sequence of pits 6) and lands (7) or symmetrically to the bit cell signal transitions (1, 2, 3, 4).
Abstract:
The apparatus includes a pickup for reading data from a super-resolution optical disc, the pickup comprising a laser for generating a main beam (SR1), a first and a second satellite beam (SR2, SR3), the two satellite beams each having a radial offset with regard to the main beam, a third satellite beam (DL2) following the first satellite beam (SR2), having the same radial offset as the first satellite beam (SR2), and a fourth satellite beam (DL3) following the second satellite beam (SR3), having the same radial offset as the second satellite beam (SR3), for providing a crosstalk correction of the HF data signal (HF). The track pitch (TP) between adjacent tracks (T1-T5) of the optical disc is particularly below the diffraction limit of the pickup, and the light intensity of each of the first and second satellite beams (SR2, SR3) and of the main beam (SR1) is sufficient to provide a super-resolution effect on the optical disc and the light intensity of each of the third and fourth satellite beams (DL2, DL3) is not sufficient to provide the super-resolution effect. The track pitch (TP) between adjacent tracks (T1-T5) of the optical disc is advantageously below the diffraction limit of the pickup.
Abstract:
The present invention relates to an apparatus (1) for reading from and/or writing to a near-field optical recording medium (10) capable of detecting tilt and spherical aberration. According to the invention, the apparatus (1) has a light source (2) for generating a reading light beam (3), a near-field lens (9), an aberration compensation element (31), and a diffractive optical element (30). The diffractive optical element (30) is switchable between a far-field mode and a near-field mode and is adapted to generate a main light beam (MB) and four or more sub- beams (SB1, SB2, SB3, SB4) from the reading light beam (3) for determining at least a cover layer thickness error signal (SE). For this purpose it has an outer region (302) with a first grating period (2P) and an inner region (301) having a diameter smaller than an effective numerical aperture of the near-field lens (9), which in the near-field mode has a second grating period (P) and which has a switchable inner area (303) having a diameter smaller than a far-field numerical aperture of the near-field lens (9), which in the far-field mode has the first grating period (2P). The aberration compensation element (31) is adapted to be adjusted based on the thickness error signal (SE) when the diffractive optical element (30) is in the near-field mode.
Abstract:
The optical storage medium comprises a substrate layer, and a data layer having a mark/space data structure with data arranged in tracks (T1-T4) on the substrate layer,, wherein between neighboring tracks alternatingly a groove section (10) or a land section (11) without a groove is arranged. The tracks, groove sections and land sections may be arranged by providing a single spiral (S1), two spirals, or four spirals on the optical storage medium. The optical storage medium is in particular an optical disc comprising a nonlinear layer with a super-resolution structure arranged above the data layer.
Abstract:
The optical storage medium comprises a substrate layer, a data layer having a pit/land data structure with data arranged in tracks on the substrate layer and a nonlinear layer (4) with a super-resolution material, wherein the data structure comprises diffractive pits and lands (7TP, 8TP, 7TL, 8TL) having a size above an optical resolution limit of a pickup for reading of the data and super- resolution pits and lands (2TP, 2TL) having a size below the optical resolution limit, said pits and lands having a defined length with regard to a channel bit length (T)., A diffractive land (8TL, DL1) preceding a super-resolution pit (2TP) is changed by a first length (Δ, Δ' ) depending on the laser power of the pickup, and/or a diffractive pit (8TP, DPI) preceding a super-resolution land (2TL) is changed by the first length (Δ, Δ' ) depending on the laser power of the pickup, to compensate a phase shift of the super-resolution pit (2TP), respectively super-resolution land (2TL).
Abstract:
The invention relates to a scanning device with shock protection comprising a swing arm, wherein the swing arm comprising a pickup for recording/reproducing data is operably connected to a storage medium and is supported on a pivot axis extending perpendicularly to the swing arm by means of a support, and wherein a magnetic drive initiating a swivel motion in parallel to the storage medium and a magnetic drive initiating a motion perpendicularly thereto are allocated to the swing arm, comprising an acceleration sensor for detecting a shock event. The invention solves the object of designing the shock protection apparatus such that the swing arm is located in a simple manner if a shock event is indicated. To achieve the, a permanent magnet (15) is arranged on the swing arm (1), with an electromagnet (16) that is permanently attached to the scanning device and arranged spaced apart from the swing arm (1) being allocated to the permanent magnet (15), the electromagnet (16) being connected to a power source (19) if the acceleration sensor (22) indicates a shock event and attracting and locating the permanent magnet (15) including the swing arm.
Abstract:
The optical storage medium (1) comprises a substrate layer (2) and a data layer (3) with a mark/space structure arranged in tracks (T1-T6), wherein a sequence (Z1) of marks of a first track (T1) have a first width (w1), and a sequence (Z2) of marks of a neighboring track (T2) have a second width (w2) being different from the first width. The optical storage medium is in particular an optical disc (1), on which the tracks (T1-T6) are arranged as spirals, circular rings or segmented circular rings.
Abstract:
The optical storage medium according to the invention uses a mask layer (2) as a super resolution near field structure, which comprises a doped semiconductor material. The semiconductor material is n-doped particularly such that the reflectivity of the semiconductor material is increased, when irradiated with a laser beam. As a semiconductor material advantageously an indium alloy and as a doping material selenium or tellurium can be used. For the manufacturing of a respective optical storage medium a sputtering method for depositing the doped semiconductor material as the mask layer can be used, wherein the dopant is included already in the semiconductor sputtering target.