| Patent application number | Description | Published |
|---|
| 20080212457 | Scanning Of Multi-Layer Optical Record Carriers - An optical scanning device for scanning a first and a second information layer of an optical record carrier, a scanning method, and an optical record carrier. The device includes at least one radiation source for providing a first radiation beam for scanning the first information layer and a second radiation beam for scanning the second information layer. An objective lens system is arranged to converge the first and second radiation beams on the respective information layers. The device is configured to determine tracking information from only one of said radiation beams, for tracking error compensation. | 09-04-2008 |
| 20080232208 | High Frequency Central Aperture Tracking - The present invention relates to an optical system for performing radial tracking on an associated optical record carrier. The optical system contains at least one radiation-emitting device capable of emitting at least three beams: a first beam for reading and/or recording information, and at least a second beam and a third beam for tracking. The optical system is adapted for radial tracking of the first spot from a tracking error signal generated based on the high-frequency component of the central-aperture signal of the second and third beams. The tracking error signal may be generated based on a difference signal of a DC-level of the power of the high-frequency components of the central-aperture signal. | 09-25-2008 |
| 20080239897 | Optical Reader/Writer With Dedicated Focus Tracking Beam - The present invention relates to an optical reader/writer for a two dimensional storage disc, comprising means ( | 10-02-2008 |
| 20080239898 | Calibration of Relative Laser Intensities in an Optical Storage System - In conventional one-dimensional optical storage systems, the data is arranged in a linear fashion, and the format is read out by a single spot. A two-dimensional encoded disc is different, because the data is arranged in a two-dimensional manner (bits are on a bit lattice) and the data is read out by multiple spots. It is important to know the relative intensity of the read-out spots, because the intersymbol interference is used in the signal processing of the reflected signals, and the present invention provides a way of calibrating the relative intensities by placing one or more mirror sections ( | 10-02-2008 |
| 20080285414 | 2D Storage with Guard Band Storing Non-Content Information - The invention applies to a 2D storage medium carrying meta-tracks of N (N>1) bit-rows, two adjacent meta-tracks being separated by a guard band of at least one bit-row referred to as guard band bit-row. The invention proposes to store non-content information in the guard band bit-row. The non-content information are clock data and/or control data. | 11-20-2008 |
| 20080316892 | Hybrid Optical Disc - An optical storage medium ( | 12-25-2008 |
| 20090002692 | Method of Measuring the Laser Power of a Forward Multiple Laser Beam in a Multibeam Optical Scanning System - A method for measuring the laser power of a forward multiple beam generated by a laser diode array comprising at least two laser diodes, the method comprising a generation step, comprising generating the forward multiple beam; a separation step, comprising separating at least part of the forward multiple beam into individual beams ( | 01-01-2009 |
| 20090041077 | OPTICAL READ-OUT - An arrangement for read-out of information from an optical information carrier is disclosed. The system comprises a VCSEL for improving the signal-to-noise ratio of light reflected from and modulated by an information carrier. The VCSEL has a substrate that transmits the emission from the active regions of the VCSEL. Thereby, the need for beam-splitters in the detection branch of the device is completely eliminated. | 02-12-2009 |
| 20090059776 | PORTABLE HYBRID STORAGE MEDIUM - The present invention relates to providing a portable storage medium ( | 03-05-2009 |
| 20090279409 | OPTIMAL DETECTION OF TWODOS SIGNALS - A method and a device for simultaneously reading information from a plurality of data tracks ( | 11-12-2009 |
| 20090296556 | READING DEVICE FOR A RECORD CARRIER - The invention provides an efficient reading device in which, even if one radiation beam should fail, no information is lost and the information can still be read out without time-consuming recurring operations. The present invention solves this problem by providing a reading device (FIG. | 12-03-2009 |
