Quotables
"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7995432 | Optical disk reproduction apparatus and optical disk reproduction method Deterioration of error rate at reproduction time is prevented even if a photodetector with a poor characteristic is included. An optical pickup unit (3) is provided with 4 photodetectors. A controller (13) obtains an error correction result of a reprod... | 08/09/2011 |
| 7421359 | Detecting back electromotive force voltage A Bemf detect circuit is configured for modeling Bemf error via calculation of time correlations associated with two or more different non-calibrated sense resistor gain values to derive a calibrated sense resistor gain value. A method is provided for calibrating a ... | 09/02/2008 |
| 7391684 | Optical disk recording/reproducing apparatus In a processing section 4, allowable gain-value range defining unit 41 measures a gain value k corresponding to a level ratio between an MPP signal and an SPP signal generated by a tracking error signal generating circuit 3 to define an allowabl... | 06/24/2008 |
| 7385887 | Address signal position detection apparatus, optical disk playback apparatus, and address signal position detection method The address signal position detection apparatus comprises a photodetector, a first and second adders which generate, from the output signals from the photodetector, two signal sequences whose phases change from each other according to a tracking error of a light spo... | 06/10/2008 |
| 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 |
| 7327643 | Radial tilt compensating optical disk apparatus using tracking control loop gain In an optical disk apparatus for focusing a light beam on a track of an optical disk by using a tracking control loop to perform at least one of recording and reproducing operations upon the optical disk, a loop level calculating unit calculates loop levels of the t... | 02/05/2008 |
| 7319648 | Apparatus and method for reproducing record for optical recording medium The method for reproducing records for the optical recording medium detects and compensates for detrack, tilt and defocus, having advantages in that: (1) the magnitude and the direction of detrack, tilt and defocus can be detected from a difference signal (for examp... | 01/15/2008 |
| 7313057 | Method for adjusting a control parameter and optical disc drive server system using the same A method for adjusting a control parameter is adopted in an optical disc drive server system, which has a compensator, a control loop and a parameter regulator. The control loop includes an optical pickup and outputs a first tracking error signal/focus error signal.... | 12/25/2007 |
| 7313060 | Optical disk system with non-linearly controlled amplifier An optical disk system includes at least one photo detector connected with a variable gain amplifier, a slicer, and a generator which is in the feedback path between the slicer and amplifier. A differential time delay detector provides the output of the optical disk... | 12/25/2007 |
| 7307926 | Apparatus and method for tracking control A tracking controller includes a tracking error detecting section and a tracking control section. The tracking error detecting section generates and outputs a tracking error signal that represents how much the focal point of a light beam has shifted from a target tr... | 12/11/2007 |
| 7304919 | Optical information reproducing apparatus having a servo control circuit In a CLV(constant linear velocity) or MCLV(substantially constant linear velocity)-type optical disk apparatus, instability of servo at inner and outer circumferences of an optical disk is prevented by adjusting a servo-loop gain of tracking servo control or focus s... | 12/04/2007 |
| 7295498 | Disk apparatus and method of generating a tracking error signal Comparators compare the amplitudes of a DPD tracking error signal indicating the phase difference between the detection signals supplied from a photodetector, and a PP tracking error signal indicating the level difference between the detection signals with the refer... | 11/13/2007 |
| 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 |
| 7281175 | Readout controlling apparatus, reproducing apparatus, recording apparatus, and readout controlling method A readout controlling apparatus for controlling reading conditions at the time of reading data coded in units of predetermined code blocks from a recording medium capable of performing error correction at a high reliability even when the playback conditions are poor... | 10/09/2007 |
| 7277378 | Offset adjusting circuit for optical disc and offset adjusting method An offset adjusting circuit for an optical disc comprises a plurality of offset-adjustment differential operational amplifiers, each of the amplifiers having an input terminal to which an output signal of an optical pickup is input and another input terminal to whic... | 10/02/2007 |
| 7263040 | Read/write position controller for optical pickup A controller includes a servo-controller for performing nonlinear and linear control of the read/write position according to an error signal to drive an actuator for driving the pickup; a switch for switching the servo-controller from open-mode to closed-mode accord... | 08/28/2007 |
| 7260031 | Digital focus and tracking servo system with one-track jump A tracking and servo system with a one-track jump is disclosed. The one track jump algorithm holds a control signal from the tracking servo system. The one track jump algorithm adds an acceleration control signal to the held control signal for a first period of time... | 08/21/2007 |
| 7248545 | Optical pickup device According to the present invention, an optical pickup device forms one main spot, a first subspot, and a second subspot by irradiation of light on an optical disk having a groove part and a land part. The optical pickup device includes operation circuits which indic... | 07/24/2007 |
| 7233551 | Optical disk control device for time-division-multiplexing and A/D conversion An optical disk control device comprises a playback signal detection unit for detecting data recorded on a disk by irradiating the disk with a converged light beam; a signal switching unit for successively selecting plural data signals obtained by the playback signa... | 06/19/2007 |
| 7224648 | Optical recording and reproduction apparatus including stable and inexpensive servo control mechanism Regions A–F of photodetectors output electric signals a–f respectively, in accordance with an amount of reflected light from an optical disc 1. The electric signals a–f are input to A/D converters through an RF amplifier unit respectively. An arithmetic... | 05/29/2007 |
| 7190648 | Method of dynamically partitioning a memory of a recording medium A method for dynamically partitioning a memory of a recording medium is disclosed. The memory has a first and second block to store the optimal recording power records for CD-R and the recording power records for CD-RW respectively. The method includes predeterminin... | 03/13/2007 |
| 7187631 | Disc apparatus for reproducing a signal on a disc using a laser beam A disc apparatus (10) includes an optical lens (14). A laser beam is irradiated onto a recording surface of the magneto-optical disc (68) through the optical lens (14), and a TE signal or an RF signal is detected on the basis of the laser... | 03/06/2007 |
| 7170847 | Means for limiting an output signal of an amplifier stage An electronic circuit is provided which can autonomously handle an input current (Ii) having a relatively wide dynamic range without being overdriven. The electronic circuit comprises an amplifier stage (AMPST) having an input (IP) for receiving the input... | 01/30/2007 |
| 7167427 | Data recorder A data recorder for recording data that prevents buffer overrun errors emits a laser beam against a recording medium to record data. The data has a level that determines the power of the laser beam. When there is a possibility of a buffer overrun, data recording is ... | 01/23/2007 |
| 7151723 | Optical disc device An optical disc device for changing intensities of light beams illuminated on an optical disc. The optical disc device comprises the following elements. A photo detecting device divided into a plurality of photo detectors is used for detecting the reflected light be... | 12/19/2006 |
| 7145845 | Optical disc player having a carriage control system relying upon a multiplied periodic signal and a tracking error signal For reproducing and/or recording information from/onto an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the pickup is servo-controlled in the radial direction of the optical disc. ... | 12/05/2006 |
| 7130329 | Apparatus and method for radio frequency tracking and acquisition A system and method for adjusting loop bandwidth in a synchronization loop of a radio receiver uses a noncoherent peak detector to determine the maximum magnitude and timing of incoming data at various code phase offsets. The maximum magnitude and timing are used in... | 10/31/2006 |
| 7116607 | Apparatus and method of removing disturbances during optical recording and/or reproducing An apparatus to remove periodic disturbances in a recording medium having large eccentricity and deflection mass includes an actuator to change a position of a pickup in response to a combination of first and second compensation signals, an error detector to detect ... | 10/03/2006 |
| 7113460 | Optical disk having pits of different depths formed therein, optical disk reproducing apparatus for reproducing the optical disk, and method of tracking the optical disk On an optical disk, a string of a plurality of pits having two different depths is formed. Quantity of light reflected from the pit string is detected by a photoreceptor element, and based on the detected quantity of reflected light, a pit depth detecting unit detec... | 09/26/2006 |
| 7106675 | Data recorder A data recorder for writing data to a recording medium that prevents buffer underrun errors. An optical head generates a laser beam at a high power level when writing data on the recording medium and at a low power level when reading data from the medium. The writin... | 09/12/2006 |
| 7099253 | Method and apparatus for DVD recognition using inner and outer tracking error signals A DVD recognition method and apparatus is disclosed. First, a disc recognition apparatus uses a laser with a specific wavelength to irradiate an inner area of the DVD, thereby obtaining an inner TE signal. Then, the disc recognition apparatus uses the laser to irrad... | 08/29/2006 |
| 7095683 | Tracking and focus digital servo system with write abort A write abort algorithm of a tracking and focus servo system that can abort a write operation on an optical disk drive is presented. The write abort algorithm monitors at least one of a tracking error signal or a focus error signal and indicates a write abort status... | 08/22/2006 |
| 7092322 | Calibration of focus error signal offset in a focus servo system A focus error signal offset calibration is presented. The focus error signal offset can be calibrated by varying the focus error signal offset to optimize an operating characteristic of the optical disk drive. In some embodiments, the operating characteristic can be... | 08/15/2006 |
| 7085204 | Method and apparatus for controlling record and reproduction of optical record medium involving averaging servo error signals Disclosed is a method and apparatus for controlling the record and reproduction of optical record medium in which plural non-record regions having different phase are arranged between recordable data regions for the distinction in the shape of the data region. The m... | 08/01/2006 |
| 7079459 | System and method for performing a spin motor startup operation A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The present invention includes starting the operation of a motor including windings and a rotor; placing the motor in ... | 07/18/2006 |
| 7079461 | Eccentricity compensation apparatus based on frequency response characteristics of an actuator of a disk drive servo system An eccentricity compensating apparatus of a disk drive servo system using frequency response characteristics of an actuator actuating a head to a position on a disk to read data on or reproduce data from the disk. The apparatus includes an error detector that detect... | 07/18/2006 |
| 7075864 | Pre-pit signal generator compensating a pre-pit signal damped, semiconductor integrated circuit, recording and playback apparatus, and pre-pit signal generation method A recording and playback apparatus comprises, a drive unit configured to rotate an optical recording medium including a recording track, a recording and playback unit configured to irradiate a light beam on the recording track, and to perform recording and playback ... | 07/11/2006 |
| 7068571 | Optical recording apparatus and control method thereof An optical system of an optical recording apparatus forms a main spot and sub-spots preceding and succeeding the main spot on a signal recording medium. The optical system is set such that the sub-spot is shifted from the main spot in the direction orthogonal to a s... | 06/27/2006 |
| 7065018 | CLV system and method using PSA lookup A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a physical sector address (PSA) from an optical medium, calculate a table i... | 06/20/2006 |
| 7061194 | Method and apparatus for controlling constant linear velocity of spindle motor using mirror signal A method and an apparatus for precisely controlling the rotation speed of a spindle motor in an optical system according to a given condition are provided. The method involves counting in response to a clock signal widths of first and second logic states of an input... | 06/13/2006 |
