Patent application number | Description | Published |
20080198711 | Power Calibration Method For Visible Label Recording - In summary, the present invention provides an efficient method of calibrating power for writing visible labels on an optical record medium. If the writing power is too low, the label will have a low contrast, while the image might even disappear after some time. If the writing power is too high, ablation might occur which means that the layer comes off forming blisters or flakes. The present invention solves this problem by providing a calibration method wherein a test pattern is recorded on an optical record medium with different power of the beam of light, the patterns recorded are read back and a reference power value is obtained from the patterns read back using a predetermined criterion. This reference power value obtained is used to calibrate the power needed for writing visible labels on the label side of an optical record medium. | 08-21-2008 |
20080239894 | TRACKING CONTROL METHOD FOR READING/WRITING OPTICAL DISK - In a tracking control method for use in an optical disk drive to read/write an optical disk, an open-loop tracking control operation of the optical disk drive is first performed according to an input tracking error signal and a predetermined periodical offset to generate a dynamic offset. Afterwards, a closed-loop tracking control operation of the optical disk drive is performed according to the input tracking error signal calibrated with the dynamic offset. | 10-02-2008 |
20080247280 | Optical Drive with Constant Radial Bandwidth - The invention relates to an optical drive for e.g. CD, DVD, HD-DVD or BD disks. A radial servomechanism controls the radial position of a laser beam in response to a push pull signal (PP). The radial servomechanism has an amplifier (VGA, | 10-09-2008 |
20090003171 | Method and Device for Reading Data - The present invention relates to a method of reading data from a record carrier, the method comprising the steps of: obtaining a readout signal by radiating the record carrier in a first mode and a second mode of operation of a light source, computing a quality factor of the readout signal for the first mode and the second mode of operation of the light source, determining a best mode of operation of the light source based on the computed quality factors and selecting the determined best mode of operation of the light source for reading data from the record carrier. This is useful for high-speed Blu-ray disc applications. | 01-01-2009 |
20090103409 | COMPENSATING GAIN OF AN OPTICAL RECORDING APPARATUS - The present invention relates to an optical recording apparatus capable of recording information on an optical record carrier. Radial tracking control is performed by the 3 spot differential push pull (PP) method. The optical recording apparatus has means for obtaining a first and second difference signal from detection signals of a reflection of a main light beam (C) and a first and a second sub light beam (A,B), and means for subtracting the second difference signal from the first difference signal so as to obtain a tracking error signal (TES). The second difference signal is adjusted by a gain factor (g) so as to compensate for a difference in intensity between the reflected light of the first and the second sub light beams during information writing. In particular, a solution may compensate for the difference in the reflections for the first and second sub light beam (A,B) so that a possible radial offset is avoided. | 04-23-2009 |
20090129222 | AN OPTICAL DRIVE WITH A VARYING BANDWIDTH - The invention discloses a method for operating an optical drive for e.g. a CD, DVD, HD-DVD or a BD disk. More specifically, the invention may improve the signal to noise ratio (SNR) and/or the carrier to noise ratio (CNR) during readout from an optical carrier by an optical drive by applying a low pass filter on a signal comprised in a data channel or an auxiliary channel of the optical drive. The low pass filter has a bandwidth frequency (f | 05-21-2009 |
20090154306 | OPTIMIZING FOCUS CROSSTALK CANCELLING - A device is arranged for scanning an optical record carrier ( | 06-18-2009 |
20090231965 | Method for setting spherical aberration correction and device using the method - A method for setting the spherical aberration correction of a scanning beam in a device for scanning an information layer of an optical record carrier. The method comprises the following steps: converging the scanning beam ( | 09-17-2009 |
20090252010 | OPTICAL DISK DRIVE WITH DISK TYPE DETERMINATION AND METHOD OF DETERMINING A DISK TYPE OF AN OPTICAL DISK WITH AN OPTICAL DISK DRIVE - An optical disk drive and a method for determining a disk type are described. The optical disk drive may be arranged to receive a radial error signal while an incident beam is focused onto the optical disk and before tracking the track, to analyze the radial error signal for detecting whether a wobble signal is present, indicating whether the track is wobbled, and to derive a disk type from the wobble signal, if present. The optical disk drive may additionally or alternatively be arranged to receive a central aperture signal while the incident beam is focused onto the optical disk and before tracking a track including a sequence of embossed pits, to analyze the signal amplitude of the central aperture signal, and to determine the disk type from at least a first variation of the signal amplitude of the central aperture signal as a function of time. | 10-08-2009 |
20090268207 | REFLECTION MEASUREMENTS ON OPTICAL DISKS - The invention makes use of the air-polycarbonate interface of an optical disk as an accurate reflection reference. The air-polycarbonate interface can be used both during production of an optical disk or during normal operation of an optical disk drive. The air-polycarbonate reflection measurement can be used in a number of applications, including the process of identifying an optical disk during normal operation, detecting contamination of the optical disk during use, and testing of an optical disk during manufacture. | 10-29-2009 |
20090274023 | DISC DRIVE AND PHOTO-DETECTOR CIRCUITS - A method of reducing power dissipation in a variable-gain photo-detector circuit is described. The variable-gain photo-detector circuit has an output to output a main spot signal and at least one side spot signal. The main spot (M) and the side spot (Si or S | 11-05-2009 |
20090285072 | METHOD FOR MONITORING AN OPTICAL DISK DRIVE PERFORMANCE QUALITY, OPTICAL DISK DRIVE, OPTICAL DISK DUPLICATOR SYSTEM AND COMPUTER PROGRAM PRODUCT - The invention relates to a method for monitoring an optical disk drive performance quality by determining a laser diode quality indicator for a laser diode arranged in an optical disk drive for scanning an optical disk. The determining includes measuring ( | 11-19-2009 |
20090310453 | OPTICAL DRIVE AND READ POWER ESTIMATION METHOD - A method of determining a maximum allowable read power for a drive-record carrier combination is described. The method finds a forward-sense setpoint value to control a light power control loop, by reading data from the record carrier at which degradation of the data occurs. This technique is useful for all optical storage devices such as CD, DVD and Blu-ray players and recorders. | 12-17-2009 |
20090316549 | OPTICAL DISK DRIVE FOR SCANNING AN OPTICAL DISK WITH A SCANNING VELOCITY AND METHOD FOR SCANNING AN OPTICAL DISK WITH A SCANNING VELOCITY - An optical disk drive and a method for scanning an optical disk that includes a substantially circular track with a scanning velocity is provided. A servo control signal (SCS) is determined based on a servo error signal (SES). A first performance indicator (IND | 12-24-2009 |
20100067358 | METHOD OF RECORDING INFORMATION ON A MULTILAYER RECORD CARRIER, AND DEVICE FOR RECORDING ON A DUAL LAYER RECORD CARRIER - Recordable DVD+R and DVD+R/W optical discs with two (or more) information layers are developed to double the data storage capacity and video recording time. A method and device are proposed to make dual layer DVD disc recordings compliant with the dual layer DVD-ROM standard Recording the data in a DVD-ROM compliant way on the dual layer DVD+R or DVD+R/W disc is obtained by shifting the middle zone area towards the inner radius of a disc in such a way that the data zones of both layers are filled up with data. | 03-18-2010 |
20100226224 | DISC DRIVE AND PHOTO-DETECTOR GAIN SELECTION METHOD - The present invention relates to a method of selecting a range of gain values ( | 09-09-2010 |