Methods and Apparatus for Formatting and Tracking Information for Three-Dimensional Storage Medium
a technology of three-dimensional storage medium and tracking information, which is applied in the field of methods and apparatus for formatting three-dimensional storage medium and tracking, can solve problems such as distortion, and achieve the effects of reducing the information capacity of the track inherent, increasing the number of servo marks, and increasing the quality of feedback signals
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first embodiment
[0102]FIG. 2d is a schematic representation of another embodiment for the coordinated spherical aberration correction for a multitude of focusing elements. The spherical aberration correction is achieved through one relatively large optical correction element that is common to a number of focusing elements and will be referred to henceforth as “Spherical Aberration Correction Common Optical Element” or SACCOE for short. The requirement is to perfectly focus the beam (to diffraction limit) and to correct all aberrations. This requirement is separated into a first part, handled by a first optical element, which is used mostly for spherical aberration correction and a second part, handled by other elements of the optical system, which is responsible, mostly, for focusing and the correction of other aberrations such as coma. In the specific embodiments the SACCOE is an optical element that comprises a slab of varying thickness of optical material that has the same refractive index as th...
second embodiment
[0103]the SACCOE, shown in cross-section, 243 is by the use of a variable amount of optical oil 244 in between two parallel glass surfaces 245 and 246. In the specific embodiment shown in the figure, the glass surfaces are kept parallel by a set of actuators, designated schematically by 247. The optical oil is pressurized to prevent non-homogeneities. The pressurizing elements and oil reservoirs are schematically shown as an annular flexible material 248. The distance between the SACCOE and the disk should be kept small to prevent aberrations.
[0104]FIG. 2c is a schematic representation of an optical unit for splitting the spots into many focal points through a single objective lens.
[0105]FIG. 2e shows schematically a multi-arm formatter 260 capable of simultaneously formatting a stack disks in precise mutual spatial disposition, to be accessed by a multitude of optical units and actuated by multiple actuators. The disks are mounted on a pin 261 shown schematically in FIG. 2f that is...
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Abstract
Description
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