Class / Patent application number | Description | Number of patent applications / Date published |
369300100 | Transducer movement control using recorded information indicative of location of information (e.g., track address) | 15 |
20090073818 | SEEKING CONTROL SYSTEM AND METHOD OF OPTICAL DISC DRIVE - A seeking control system in an optical disc drive is disclosed. The system comprises a servo controller, a velocity control unit, and a switch unit. The servo controller receives a central servo signal to output a first tracking control signal for the tracking coil. The velocity control unit receives a tracking error signal to determine a velocity of the pickup head and compares the velocity of the pickup head with a predetermined velocity profile to generate the second tracking control signal. The switch unit outputs the second tracking control signal instead of the first tracking control signal to the motor driver to control the pickup head moving steadily. | 03-19-2009 |
20110216636 | METHOD OF AND APPARATUS FOR RECORDING DATA ON WRITE-ONCE DISC AND WRITE-ONCE DISC THEREFOR - A method of recording, and an apparatus for recording, data on a write-once disc, and the write-once disc used with the method and the apparatus. The write-once disc includes a plurality of update areas in which to record a predetermined type of updated information, at least one main access information area (AIA) in which to record main access information (AI), the main AI indicating a final update area in which finally updated information is recorded, among the plurality of update areas, and at least one sub AIA in which to record sub AI, the sub AI indicating a location of the finally updated information recorded in the final update area. | 09-08-2011 |
20110255381 | FORMAT DETERMINING APPARATUS - A pick-up of a format determining apparatus irradiates light to an optical disk to generate a reproduction signal. A signal processing unit decodes the reproduction signal to generate main data. A CD-ROM decoder decodes the main data. A CD-ROM determining unit determines whether or not the main data is in a CD-ROM format, based on the decoded main data. A reproduction signal determining unit determines whether or not the reproduction signal is normal when the main data is not in the CD-ROM format. A system control unit determines that the main data is in a CD-DA format, when the main data is not in the CD-ROM format, and when the reproduction signal is normal. | 10-20-2011 |
20110255382 | RECORDING DETERMINATION APPARATUS AND RECORDING DETERMINATION PROGRAM - A movement device of a recording determination apparatus moves a pickup in a radial direction of an optical disc. The pickup irradiates laser light to the optical disc to output an electric signal, based on reflected light from a laser spot. A control device acquires address information relating to an arrangement position of the laser spot, based on the electric signal. The control device controls the movement device to move the laser spot from a data area to a recordable area. The control device determines whether or not data is recorded in the recordable area, based on the electric signal until a reference time has elapsed from a border potion between the data area and the recordable area, the border portion being specified based on the address information. | 10-20-2011 |
20110267931 | CONTROLLER FOR RECOVERING DISC MANAGEMENT INFORMATION OF A RECORDING MEDIUM - A controller for recovering disc management information is provided. The controller controls a pickup head unit to search the TDMAs for readable disc management information which is included in an in-use TDMA of the TDMAs; then determines whether a piece of information associated with an inconsistency flag of the readable disc management information is reliable. When the controller detects that the piece of information is unreliable, the controller determines at least a detection condition according to the information which is included in the readable disc management information and the in-use TDMA, and controls the pickup head unit to detect the recording medium to determine an update on the piece of information associated with the inconsistency flag under at least a detection condition. The controller generates update disc management information according to the readable disc management information and the update on the piece of information associated with the inconsistency flag. | 11-03-2011 |
20110273970 | OPTICAL INFORMATION RECORDING MEDIUM, AND DEVICE FOR RECORDING/REPRODUCING INFORMATION ON/FROM OPTICAL INFORMATION RECORDING MEDIUM - An optical information recording medium ( | 11-10-2011 |
20110310714 | SENSORLESS MOTOR DRIVE DEVICE - A sensorless motor drive device has: a first operation mode of generating current waveforms including non-energizing times based on a first rotor position signal generated by detecting zero crossings in windings of a motor as a signal indicating the rotor position of the motor, and supplying currents to the windings of the motor according to the current waveforms; and a second operation mode of generating current waveforms including no non-energizing time based on a second rotor position signal generated without use of zero crossings as the signal indicating the rotor position of the motor, and supplying currents to the windings of the motor according to the current waveforms. The first and second operation modes can be switched to each other. | 12-22-2011 |
20120033535 | OPTICAL DISC AND OPTICAL DISC DRIVE - The present invention provides a multilayer optical disc and an optical disc drive which can identify recording layers without performing tracking servo control or changing the structure of the disc. In a multilayer optical disc | 02-09-2012 |
20120307607 | RECORDING MEDIUM, REPRODUCTION AND RECORDING METHOD, REPRODUCTION AND RECORDING DEVICE - Obtain an expanded address without altering the bit number of an address which is embedded in a wobble. Generate a virtual bit which is not recorded on a disc, and which is expressed by the disparity from the rules and the presence or absence of information embedded in part or all of the wobble address. | 12-06-2012 |
20120307608 | RECORDING MEDIUM, REPRODUCTION AND RECORDING METHOD, REPRODUCTION AND RECORDING DEVICE - Obtain an expanded address without altering the bit number of an address which is embedded in a wobble. Generate a virtual bit which is not recorded on a disc, and which is expressed by the disparity from the rules and the presence or absence of information embedded in part or all of the wobble address. | 12-06-2012 |
20140153374 | OPTICAL DISC WITH PRE-RECORDED AND RECORDABLE REGIONS AND METHOD OF FORMING THE DISC - An optical disc having a region with pre-recorded data and a recordable region, a method of fabricating the disc, a stamper for forming a disc master, and a recording device for use with the disc are disclosed. Data recorded in the recordable region may be used for activation of the disc, providing unique identification or enhancing program content on the disc. | 06-05-2014 |
369300120 | Particular track portion | 3 |
20090268568 | Portable data storage assembly having a holographic data storage layer and an optical tracking layer - A portable data storage assembly, comprising a holographic data storage layer, and an optical tracking layer comprising addressing information for the holographic data storage layer, wherein that addressing information defines a first storage band comprising a first plurality of storage addresses and a second storage band comprising a second plurality of storage addresses, wherein said second plurality of storage address is greater than said first plurality of storage addresses. | 10-29-2009 |
20100034058 | ADDRESSING DISC STORAGE SPACE USING HEAD POSITION - Current BD specification prescribes that in an ADIP an address is expressed with 21 bits, 19 to indicate the corresponding RUB number, and 2 to be set to 00, 01 and 10 consecutively in the 3 successive ADIP corresponding to one RUB, the smallest addressable portion of data on a disc. From this it derives that at most 32.2 GB of storage space can be addressed. Due to recent developments however, a storage capacity of 35 GB per layer could be achieved. According to the invention, one or more bits are added to the 21 bits currently allocated to express an address. This additional bits however are not stored in the ADIP but left implicit, exempting from a heavy deviation from the current BD encoding rules. The additional bits are reconstructed by an apparatus on the basis of the position on the information carrier where the corresponding RUB is present. | 02-11-2010 |
20110170384 | OPTICAL DISC DRIVE - An optical disc drive according to the present invention writes information on an optical disc, which includes a substrate on which a number of pre-pits have been formed on its tracks and a recording film that is supported on the substrate. The optical disc drive includes a writing control section for instructing an optical pickup to record marks on the tracks by irradiating the recording film with a writing light beam. In accordance with information that defines, on the tracks, recordable areas Aa | 07-14-2011 |
369300150 | Multiple movement control modes | 1 |
20120163140 | MULTI-STAGE FOCUS ACTUATOR AND OPTICAL HEAD - Techniques are provided for using a multi-stage actuator to actuate one or more optical components of an optical head. The multi-stage actuator includes a cross-layer displacement component which actuates an optical component to change the beam focus in a displacement range corresponding to the thickness of the data layers in a holographic disk, such that a beam is impinged on the target data layer. The multi-stage actuator also includes a intra-layer focusing component which actuates the optical component in a smaller range to focus the beam on the target data position. The cross-layer displacement component and the intra-layer focusing component may each include more than one actuator. In some embodiments, the focusing component also actuates the optical component in a tilting motion to compensate for movement or imperfections of the disk during a reading or recording process. | 06-28-2012 |