Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8159917 | Wobble signal detector including the signal processor, optical disk apparatus including the wobble signal detector and read-write optical disk drive including the wobble signal detector A signal processor includes an operational amplifier performing an operation on first and second signals, and amplifying a signal resulting from the operation based on an amplification control signal to remove an offset voltage, a buffer buffering an output signal o... | 04/17/2012 |
| 8036081 | Optical disk device and optical disk processing system having optical disk device An optical disk processing system having a recording unit and a printing unit is provided. The optical disk processing system comprises a printing unit and a recording unit. A drive controller of the recording unit rotationally drives a loaded optical disk (D) and d... | 10/11/2011 |
| 7916599 | Method to balance spindles in a plurality of disk drives A method to balance spindles in a plurality of disk drives is disclosed and claimed. An initial imbalance and initial phase for one of the plurality of disk drives is determined, the determination depending upon an amplitude and phase calibration. One of a plurality... | 03/29/2011 |
| 7848199 | Spindle motor controlling method and optical disk drive using the same An optical disk drive includes a spindle motor, a power source, a microprocessor, and a comparator. The spindle motor is for supporting a disk. The power source supplies a first voltage to drive the spindle motor to rotate. The microprocessor signals the power sourc... | 12/07/2010 |
| 7817520 | Optical disk drive including stepper pointer indicating rotation of stepping motor An optical disk drive capable of detecting occurrence of step-out or tooth jump in a mechanism for transferring an optical pickup. The optical pickup is transferred in a radial direction of the optical disk by means of a stepping motor. Upon receipt of a seeking ope... | 10/19/2010 |
| RE41469 | Optical disk recording method employing a plurality of recording areas and apparatus therefor An optical disk apparatus comprising a reproduced signal detector which digitizes a reproduced signal from an optical disk, a broadband synchronizing clock signal generator for generating a synchronizing clock signal for use in reproducing data, a signal processor f... | 08/03/2010 |
| 7693023 | Method and apparatus for recording data on optical recording medium A method and apparatus to record data on an optical recording medium include generating a recording waveform having an erase pattern comprising a multi-pulse having a high level which is higher than an erase power level and a low level which is lower than the erase ... | 04/06/2010 |
| 7428202 | Write-once read-many information recording medium, information recording method, information reproduction method, information recording apparatus, and information reproduction apparatus A write-once read-many information recording medium is provided, which is capable of easily searching for a latest DDS and a latest defect list. At least one disc management working area is sequentially allocated in a predetermined direction on the write-once read-m... | 09/23/2008 |
| 7403459 | Rotational speed control method for a disk player A method is disclosed for adjusting the rotational speed of a disk player based on a calculated variable. The method increases the rotational speed of the disk player when the calculated variable is greater than a first threshold and decreases the rotational speed o... | 07/22/2008 |
| 7394736 | Dynamic speed control method for storage device A method is disclosed for adjusting the rotational speed of a disk drive. According to the method, the proportion of time which the disc drive is reading data from the disc during a unit time T is calculated. Then, the increase of the rotational speed of the motor i... | 07/01/2008 |
| 7391683 | Apparatus and method for detecting tilt of disc An apparatus and a method for reducing a lead-in time of a disc, on which data is always recorded, and detecting exactly a tilt of the disc. The apparatus includes a pickup, and a system controller. Even if the disc is a blank disc which is devoid of user data, cont... | 06/24/2008 |
| 7382706 | Method for controlling a multi-pulse record waveform at high velocity in a phase change optical medium A driving power is applied to a light source to control emission of a light beam to a recording layer of an optical storage medium, the driving power including a sequence of mark and space portions, each mark portion having a pulse width that corresponds to a multip... | 06/03/2008 |
| 7376064 | Method and apparatus for recording data on optical recording medium A method and apparatus to record data on an optical recording medium include generating a recording waveform having an erase pattern comprising a predetermined pulse having a high level which is higher than an erase power level and having a low level which is lower ... | 05/20/2008 |
| 7352666 | Focus-balance calibration method Absolute time in pre-groove (ATIP) signals or gain amplification signals corresponding to the ATIP signals for auto gain control (AGC) are used for focus-balance calibration of a blank optical disc. The ATIP signals are obtained in response to the movement of an opt... | 04/01/2008 |
| 7352669 | Method and device for disc rotation control in an optical storage system based on detected extent of disc warping A digital signal processing device is provided for disc rotation control in an optical storage system, which is capable of generating a focusing error signal from light that was reflected by an optical disc loaded in the optical storage system. The digital signal pr... | 04/01/2008 |
| 7342860 | Method and apparatus for recording data on optical recording medium A method and apparatus to record data on an optical recording medium include generating a recording waveform having an erase pattern comprising a predetermined pulse having a high level which is higher than an erase power level and having a low level which is lower ... | 03/11/2008 |
| 7343544 | Optical disk playback apparatus and data playback method therefor An optical disk playback apparatus for playing back or reproducing main data and its associated sub-code which are read from an optical recording medium comprises an interleave RAM for storing the main data. The optical disk playback apparatus performs a predefined ... | 03/11/2008 |
| 7336588 | Method of and apparatus for recording data on optical recording medium A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a ... | 02/26/2008 |
| 7334242 | Method and device for ejecting disc A method for ejecting a disc includes the steps of conveying a disc back to a disc-holding position on a rotator by conveyor pulleys if an error occurs in an ejecting process of the disc, and subsequently performing a retry operation of the ejecting process. Specifi... | 02/19/2008 |
| 7333413 | Optical storage device rotation speed control apparatus and method A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first pulse of a first voltage and a second pulse of a second voltage are sen... | 02/19/2008 |
| 7333414 | Rewritable optical recording medium, recording method on the same, and optical disc recording/retrieving apparatus In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous ma... | 02/19/2008 |
| 7313078 | Method of and apparatus for recording data on optical recording medium A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a ... | 12/25/2007 |
| 7304926 | Motor control system having output clamp function and method of the same A motor control system comprises a motor controller and a clamp apparatus and is used for controlling a motor apparatus. The motor controller is used for generating a motor control output according to a reference signal and a feedback signal from the motor apparatus... | 12/04/2007 |
| 7304931 | Recording medium, optical disk apparatus and writing method Recording parameters are decided so that the time control information on at least the front edge and the rear edge of a parameter forming a mark of twice size or above of the laser spot diameter focused on the recording medium is substantially proportional to the re... | 12/04/2007 |
| 7301867 | Method and apparatus for changing a recording speed of a disk device The present invention relates to a recording speed determining method of a disk device. The present method, when data record is requested from a host through an interface, a disk device can receive size information about data to be recorded and/or the present time f... | 11/27/2007 |
| 7301884 | Method of and apparatus for recording data on optical recording medium A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a ... | 11/27/2007 |
| 7295505 | Method of and apparatus for recording data on optical recording medium A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a ... | 11/13/2007 |
| 7289397 | Method and apparatus for determining position of optical pick-up head A method for determining the position of a pick-up head involves retrieving the respective parameter values relating to the linear velocity and angular velocity of the pick-up head at a certain place on the optical disk, and then calculating the ratio of the paramet... | 10/30/2007 |
| 7289411 | Optical disc apparatus The present invention provides an optical disc apparatus capable of rotating an optical disc with high speed while enabling reduced current consumption. The optical disc apparatus comprises a spindle motor for rotating the optical disc and a thread motor for driving... | 10/30/2007 |
| 7289407 | Methods for establishing audio track digital audio extraction speed A method for recording audio data to optical media is provided. The method includes obtaining a number of audio tracks on a source optical media and setting a source optical media device to a maximum read speed for the source optical media device. Also included is r... | 10/30/2007 |
| 7286453 | Rotation control device, method thereof, program thereof, recording medium storing the program, and information processing apparatus A temperature sensor (131) detects a temperature of a spindle motor (121) of a rotary drive unit (120) for rotating a disk-shaped recording medium (1), and a temperature information acquiring unit (134A) acquires the temperatures a... | 10/23/2007 |
| 7281069 | Method and system for extending the functionality of an embedded USB transceiver interface to handle threshold shift of a USB 2.0 bus during high-speed chirp Methods and systems for extending the functionality of an embedded Universal Serial Bus (USB) transceiver interface to handle threshold shift of a USB 2.0 bus during high-speed chirp are presented. A method for a transceiver of a host coupled by a USB 2.0 bus to a d... | 10/09/2007 |
| 7279860 | System and method for evaluating back electromotive force in a motor Methods for evaluating back electromotive force (EMF) in a polyphase motor is described. The methods include monitoring back EMF in the motor after a commutation of the motor, and evaluating the back EMF only after a back EMF event occurs after the commutation of th... | 10/09/2007 |
| 7280460 | Method of and apparatus for recording data on optical recording medium A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a ... | 10/09/2007 |
| 7277373 | Optical disc apparatus In an optical disc apparatus reading and writing data with respect to an optical disc, a motor controller uses widest pattern signals outputted from an optical pickup for judging size of an optical disc mounted on a turn table and stop of rotation of the optical dis... | 10/02/2007 |
| 7274647 | Method of and apparatus for recording data on optical recording medium A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a ... | 09/25/2007 |
| 7272740 | Performance indication system for use with a universal serial bus signal and a method of operation thereof A performance indication system for use with a Universal Serial Bus (USB) signal. In one embodiment, the performance indication system includes a rate discrimination subsystem that is configured to provide a determination of a data transfer rate of the USB signal co... | 09/18/2007 |
| 7269103 | Switch device, data-processing apparatus and playback apparatus A tape-shaped switch (500) is provided on a base part (410). Coil springs (460) support a ring-shaped rotational drive section (450) on the position opposed to the switch (500), biasing the same away from the base part (410)... | 09/11/2007 |
| 7259534 | Method for controlling spindle motor by time length for passing through defect A method of use a defect measure to control spindle motor is described. A system gets the defect situation from a CD by referring a maximum time of pass through the defect and a total time of pass through the defect. According the maximum scrape and the scrape of wh... | 08/21/2007 |
| 7257072 | Digital audio data reproducing system A digital audio data reproducing system includes a digital audio data reproducing apparatus having a record medium, a detection part for the record medium and a processing unit; an analog record player; and a rotation detecting apparatus for sensing the speed and se... | 08/14/2007 |
