Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8179754 | Optical disc apparatus, method, and information storage medium for reading information recorded on an optical disc medium An optical disc apparatus controls a relative position of an optical pickup with respect to a surface of an optical disc medium according to an output signal output from the optical pickup according to information recorded on the optical disc medium to implement ser... | 05/15/2012 |
| 8085631 | Tracking control device, tracking control method, and optical disc apparatus The invention provides a tracking control device, a tracking control method, and an optical disc apparatus that enable to stably perform the tracking control, and reduce an influence of stray light from the other layer on the tracking control. A sub push-pull signal... | 12/27/2011 |
| 8064300 | Optical disk apparatus, signal processing semiconductor integrated circuit constituting the same, and operation method In order to cancel an offset caused by a variation of a signal inputted from an optical pickup, variations of elements in an integrated circuit, etc., a calibration circuit which generates and feeds back an offset adjustment amount that makes the offset zero by a co... | 11/22/2011 |
| 7995431 | Optical disc device The optical disc device has a circuit 4 which forms a focus error signal FER for focus servo control based on reflection light from an optical disc exposed to laser light. A data processing unit 2 can control by feedback a position to which an objectiv... | 08/09/2011 |
| 7974161 | Method of adjusting gain balance of optical transducer A method of adjusting gain balance of an optical transducer includes the following steps. First, two external gains are predetermined. Next, the projection position of a reflection spot is adjusted toward one side of the optical transducer, and the current output va... | 07/05/2011 |
| 7907483 | Recording medium having a substrate containing microscopic pattern of parallel groove and land sections and recording/reproducing equipment therefor An information recording medium 1 at least comprises a substrate 13 having a microscopic pattern 20, which is constituted by a shape of continuous substance of approximately parallel grooves formed with a groove section G and a land section L al... | 03/15/2011 |
| 7903509 | Recording medium having a substrate containing microscopic pattern of parallel groove and land sections and recording/reproducing equipment therefor An information recording medium 1 at least comprises a substrate 13 having a microscopic pattern 20, which is constituted by a shape of continuous substance of approximately parallel grooves formed with a groove section G and a land section L al... | 03/08/2011 |
| 7848190 | Optical disc apparatus switching focus point between layers A focus jump technique enables focus control on recording layers of a disc in such a manner that its effect is not absorbed by disturbance or a variation in the movement speed of an objective lens. The technique involves monitoring level of a focus error signal and ... | 12/07/2010 |
| 7835236 | Servo control apparatus and method, and disk recording or playback apparatus There is provided a servo controller that can automatically set a filter intended for stabilizing a closed loop. The servo controller includes a repetitive controller. The repetitive controller implements repetitive control of a servo error signal (observation signa... | 11/16/2010 |
| 7791988 | Method and apparatus of determining bias voltage of servo signal in optical disc drive A method for determining a bias voltage of a servo signal of an optical disc drive is disclosed. The method includes: generating a plurality of sensing signals via an optical sensor of the optical disc drive; generating a first and a second servo signals according t... | 09/07/2010 |
| 7764577 | Method for pre-calibrating balance gain of analog front end in optical disk drive to calibrate variation of focus balance A method for pre-calibrating a balance gain of an analog front end in an optical disk drive to calibrate a variation of a focus balance. The method includes the steps of: adjusting the balance gain of the focus balance; moving a lens and getting an S curve; and comp... | 07/27/2010 |
| 7746735 | Laser focus controlling method on an optical disk and an optical disk apparatus with using thereof In a focus controlling method of a laser beam for an optical disk, achieving a stable focus drawing-in, lowering ill influences due to stray lights, detecting an electric signal, which is obtainable upon basis of a reflection light from the optical disk loaded, in a... | 06/29/2010 |
| 7680004 | Digital servo system with inverse non-linearity compensation A servo system with in an optical disk drive with an inverse non-linearity compensation is disclosed. An error signal calculated from signals received from an optical pick-up unit can be offset by an offset value and amplified by a gain in the early stages of a calc... | 03/16/2010 |
| 7660213 | Focus layer jump control circuits and methods of controlling focus layer jumps used by the same A focus layer jump control circuit may include a signal processing block that converts an analog focus error (FE) signal into a digital FE signal, in response to the analog FE signal and a FE selection signal; a layer jump control block that outputs a second control... | 02/09/2010 |
| 7633842 | Apparatus for generating tracking error signal in optical disc drive The present invention discloses an apparatus for generating a TE signal in an optical disc drive. The disclosed apparatus includes a signal generation module, a quality detection module coupled to the signal generation module, and a signal-synthesizing module couple... | 12/15/2009 |
| 7613084 | Method for seeking target position on multi-layer disc A method for seeking a target position on a multi-layer disc is provided. When a target position seek operation requires a layer jump in an optical disc, a required horizontal movement direction for the optical pick-up is determined. If the optical pickup must move ... | 11/03/2009 |
| 7564748 | Optical disk recording/reproducing apparatus The gain of an amplification circuit for amplifying a tracking error signal generated from an RF signal sent from an optical pickup is adjusted according to a low-frequency component signal sent from a lowpass filter. A drive circuit drives an actuator according to ... | 07/21/2009 |
| 7558169 | Discs, image forming methods and optical disc apparatuses for forming a multi-color image in a color forming layer on an optical disk Blue color forming sub-layer (205), green color forming sub-layer (206) and red color forming sub-layer (207) which start to form colors upon application of different amounts of energy are superposed on the image surface of optical disc (D). The... | 07/07/2009 |
| 7551529 | Optical disc apparatus In an optical disc apparatus, the amplitude level of a focus error signal for performing focus search is measured, and in order to bring the measured amplitude level of the focus error signal to a target value, gains of focus servo drive amplifiers which amplify res... | 06/23/2009 |
| 7539091 | Differential push-pull gain controlling method and apparatus to reduce the effects of rotational eccentricity An apparatus comprising a photo diode array, a differential push-pull generator circuit and an attenuation prediction circuit. The photo diode array may be configured to generate a plurality of beam signals. The differential push-pull generator circuit may be config... | 05/26/2009 |
| 7499382 | Method for gain adjustment for production of a lens position signal, and a corresponding appliance for reading from and/or writing to an optical recording medium A lens position signal LCE which indicates the discrepancy between the lens and its geometric mid-position is required for coarse tracking of optical storage drives. The prior art is for the lens position signal LCE to be formed in three-beam pick-ups by weighted co... | 03/03/2009 |
| 7471597 | Optical disc apparatus switching focus point between layers A focus jump technique enables focus control on recording layers of a disc in such a manner that its effect is not absorbed by disturbance or a variation in the movement speed of an objective lens. The technique involves monitoring level of a focus error signal and ... | 12/30/2008 |
| 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 |
| 7406016 | Optical disk apparatus and control method for controlling distance between a head and a disk An optical apparatus includes: a light source outputting light; a head disposed so as to face a disk on which a signal is recordable, the head being capable of condensing a light from the light source onto the disk as near-field light; an distance adjusting mechanis... | 07/29/2008 |
| 7394734 | Optical disk drive using near-field light, optical disk apparatus, and method for driving the apparatus An optical disk drive includes a light source, a light focusing element, a light-focusing-element moving mechanism, a detecting unit, a holding unit, and first and second control units. The light focusing element arranged so as to be opposed to a disk on which a sig... | 07/01/2008 |
| 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 |
| 7372660 | Disc storage system with adaptive PID control A disc drive controller circuit for an actuator receives reference data indicating a desired actuator position “θd”, error data indicating a difference “e” between the desired actuator position and a sensed actuator position “θ”, and adaptiv... | 05/13/2008 |
| 7366065 | Optical disk apparatus and an optical disk recording and reproducing method An optical disk apparatus and an optical disk recording and reproducing method are provided in which an actuator can be controlled in stable fashion at the time of high-speed recording operation. Before performing the high-speed recording operation under servo contr... | 04/29/2008 |
| 7355931 | Optical disc center error amplitude calibration A method for calibrating a center error signal in an optical disc system, comprising the steps of (i) measuring a peak-to-peak value of the center error signal, (ii) computing a nominal peak-to-peak value of the center error signal after locking to a particular trac... | 04/08/2008 |
| 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 |
| 7352667 | Optical disc drive with a system behavior detection module An optical disc drive includes a servo system and a system behavior detection module. The system behavior detection module includes a controller and a signal feeding unit coupled to the controller and the servo system. The controller is operable in a detection mode ... | 04/01/2008 |
| 7342854 | Apparatus for generating tracking error signals An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after co... | 03/11/2008 |
| 7336292 | Optical media label printing using different power levels A visible light characteristic changing layer formed from photosensitive or heat-sensitive material is formed in a location which can be viewed from a part of a label surface of an optical disk. The optical disk is set on a turntable of an optical disk unit while th... | 02/26/2008 |
| 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 |
| 7317669 | Method and apparatus for compensating for disc eccentricity in optical disc servo system A method and apparatus compensating for disc eccentricity includes extracting eccentricity data from a tracking error signal having one period, generated by a tracking servo, detecting parameter values of an eccentricity component extracted during the extraction of ... | 01/08/2008 |
| 7317673 | Apparatus and method for setting offset of digital, video disc, and apparatus and method for adjusting offset An apparatus for setting an offset in a DVD player includes: an offset measuring unit which measures one or more offset parameters for initial reproducing operations of the DVD player; and an offset setting unit which, when the offset measuring unit measures the one... | 01/08/2008 |
| 7315495 | High-speed focus pull-in controllers for adaptively responding to disk surface vibration of an optical disk device and focus control methods thereof Upper and lower limit values of disk surface vibration are detected and stored per a predetermined time while a signal is reproduced from an optical disk device and, if focus on the disk deviates from a focus allowable range initially set, a focus repull-in operatio... | 01/01/2008 |
| 7315494 | Optical disk device and method for controlling slider An optical disk device includes a head including an actuator that supports and moves an objective lens at least in a direction of focusing, and a slider for transporting the head in the direction of tracking. In response to a static acceleration acting on the object... | 01/01/2008 |
| 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 |
| 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 |
