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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
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| Number | Title | Issue Date |
| 8441909 | Disk drive increasing laser power at beginning of write in heat assisted magnetic recording A disk drive is disclosed comprising a disk comprising a plurality of data tracks, wherein each data track comprises a plurality of data sectors. A head is actuated over the disk, wherein the head comprises a laser operable to heat the disk while writing data to the... | 05/14/2013 |
| 8427928 | Optical head and optical information device An optical head 200 comprises: a light source 101 that emits a light beam; an objective lens 105 that condenses, in the form of converging light, the light beam emitted by the light source 101, onto an information recording medium; a cyli... | 04/23/2013 |
| 8416671 | Recording apparatus A recording apparatus for recording information on an optical recording medium includes a mode-locked laser unit that includes a semiconductor laser emitting a laser beam for recording the information on the optical recording medium, and an external resonator, an op... | 04/09/2013 |
| 8411549 | Circuit for preventing destruction of semiconductor laser element, and optical disc device provided with the circuit A circuit for preventing destruction of a semiconductor laser element of an optical disc device comprises a light-emission-directing circuit part for outputting a light-emission-directing signal for directing the semiconductor laser element to emit light; a voltage-... | 04/02/2013 |
| 8379503 | Optical information recording reproduction apparatus and optical information recording reproduction method An optical information recording reproduction apparatus includes: a first light beam source; a second light beam source emitting a beam with a wavelength shorter than that of the first light beam source; and an object lens condensing the beams from the first and sec... | 02/19/2013 |
| 8374069 | Storage medium, reproducing method, and recording method According to one embodiment, a write-once type information storage medium comprises an organic dye based recording material having sensitivity at a wavelength of 405 nm and at a recording wavelength in the range of 600 nm to 700 nm, wherein, when absorbance of a max... | 02/12/2013 |
| 8355310 | Optical information recording method To solve the problem of deterioration in recording quality due to a change of a write waveform caused by changes of temperature and recording powers, aged deterioration and the like. A driver having a function of controlling rise/fall times and an overshoot amount o... | 01/15/2013 |
| 8325584 | Storage medium, reproducing method, and recording method According to one embodiment, a write-once type information storage medium comprises an organic dye based recording material having sensitivity at a wavelength of 405 nm and at a recording wavelength in the range of 600 nm to 700 nm, wherein, when absorbance of a max... | 12/04/2012 |
| 8325583 | Laser diode driver with wave-shape control An optical disk drive system associated with a laser diode is described. The optical disk drive system comprises a current generator for receiving input signals; a current switch coupled to receive timing signals; a current driver coupled to receive output signals f... | 12/04/2012 |
| 8315142 | Optical disk apparatus and its reproducing method Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion ... | 11/20/2012 |
| 8310912 | Method for monitoring an optical disk drive performance quality, optical disk drive, optical disk duplicator system and computer program product 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, includes measuring an actual value of a parameter associated with a las... | 11/13/2012 |
| 8295147 | Optical pickup apparatus An optical pickup apparatus includes: a circuit board; a laser diode mounted on one face of the circuit board; and a high-frequency superimposition integrated circuit arranged on the other face of the circuit board, the high-frequency superimposition integrated circ... | 10/23/2012 |
| 8289832 | Input signal processing system An input signal processing system is described. It comprises a first transconductance device having a first input, second input, and an output, wherein the first input is coupled to receive the input signal; a first resistor coupled to a first input of the first tra... | 10/16/2012 |
| 8264940 | Recording/reproduction device, recording/reproduction method, and information recording medium The present invention contributes to getting a reproduction/recording operation done with stability on an information recording medium by utilizing an absorption edge shifting phenomenon. An apparatus 100 according to the present invention includes: a light s... | 09/11/2012 |
| 8243576 | Optical disc device and playing method of optical disc To determine the optimum amplitude of high frequency signal for the loaded disc with a simple configuration to achieve stable playing performance, there is provided an optical disc device comprising: a light source driven by a drive signal with a high frequency sign... | 08/14/2012 |
| 8228780 | Optical disk device Proposed is an optical disk device capable of optimally adjusting a current value of a direct current and a high frequency superimposed current for driving a laser diode. This optical disk device includes a laser driver for superimposing a high frequency current on ... | 07/24/2012 |
| 8223616 | Reproducing system for use with optical devices A reproducing system reproduces data recorded on an optical record carrier. The system includes a light source driver unit that modulates and controls a light output by a light source, such as a laser, in order to read data from an optical record carrier. The system... | 07/17/2012 |
| 8218415 | Laser power control system and method used in optical disc writer A laser power control system and method used in an optical disc writer. According to a write power value, the laser power control system drives a laser to output a write power through a first channel. According to a proportional value, the laser power control system... | 07/10/2012 |
| 8213288 | Optical information reproducing apparatus, information reproducing method of optical information reproducing apparatus, program and recording medium A deterioration of reproduction light is occurred by a laser drive current on which a high-frequency current is superimposed. The present invention, for example, is an optical information reproducing apparatus which irradiates a laser beam to an optical disc 1 | 07/03/2012 |
| 8194523 | Optical disc apparatus and optical disc reproducing method An optical disc apparatus includes a light source for emitting laser light, a light source drive unit for driving said light source, an optical element for splitting the laser light into a plurality of light fluxes, an optical element drive unit for controlling the ... | 06/05/2012 |
| 8174954 | Optical information recording and reproducing method and optical information recording and reproducing apparatus An optical information recording and reproducing method for recording or reproducing information by irradiating pulsed laser diode light from a laser diode (LD) light source in which the resistance value of the LD light source is measured in an operating state, the ... | 05/08/2012 |
| 8174953 | Input current channel device An input current channel device is described. This device comprises a first terminal for receiving a reference signal; a second terminal for receiving a first target signal; a pass through device coupled to the first terminal, the pass through device operative for t... | 05/08/2012 |
| 8165005 | Optical recording method and optical recording apparatus Disclosed is an optical recording method. The optical recording method includes irradiating an area where a recording mark is formed in a medium with a pulse train of laser light, and irradiating the area where the recording mark is formed with continuous-wave laser... | 04/24/2012 |
| 8165006 | Optical disc device and data reproduction method for the same Prevention of deletion of data in an unintended recording layer of an optical disc is ensured even when servo deviation occurs while controlling data reproduction. A light source outputs a light beam with light intensity according to a driving current on which a hig... | 04/24/2012 |
| 8139465 | Optical disc recording device, method, and computer program An information recording apparatus (1) is provided with: a recording device (102) for recording information onto an information recording medium (100) by irradiating the information recording medium with a recording laser beam (L); a controlling... | 03/20/2012 |
| 8121014 | Method and apparatus for determining the reading power of an optical reproducing device Since the conventional optical disk recording/reproducing apparatus cannot correctly measure a power of a main beam that is a part of the laser light outputted from an objective lens and is focused on a recording layer to contribute to recording/reproducing, it is d... | 02/21/2012 |
| 8111603 | Optical disk apparatus and its reproducing method Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion ... | 02/07/2012 |
| 8102750 | Super resolution producing apparatus capable of adjusting reproduction power When a super resolution technology for optical disks is used in a situation where optical disk management information is formed with a signal that cannot be reproduced by a reproduction method based on a conventional optical disk technology, optical disk drives cann... | 01/24/2012 |
| 8102751 | Optical recording condition setting method, optical recording/reproducing device, control program, and recording medium In order to provide an optical recording condition setting method which reduces effects from uneven properties of a rewritable or recordable optical disk and an optical recording/reproducing device, and to provide an optical recording/reproducing device which execut... | 01/24/2012 |
| 8077586 | Optical recording head device, optical recording apparatus, and recording method According to one embodiment, an optical recording head device includes a light source which outputs such a relaxation oscillation optical pulse that a full width at half maximum of a single pulse is 820 ps or less, a driving unit for driving the light source, an obj... | 12/13/2011 |
| 8064321 | Hybrid laser diode drivers that include a decoder Provided herein are hybrid laser diode drivers (LDDs) that drive a laser diode in response to receiving enable signals from a controller. In accordance with specific embodiments, a hybrid LDD includes a read channel to selectively output a read current, one or more ... | 11/22/2011 |
| 8023391 | Photodetection device and optical disk device A photodetection device is provided with a photoelectric converter portion that converts light to electric current, an electrical current/voltage converter portion, including a feedback circuit that returns at least part of the output to the input side, that convert... | 09/20/2011 |
| 8018817 | Method of recording erase pattern information on an optical recording medium, erasing information on the optical recording medium based on the erase pattern information, and optical recording medium therefor An optical recording medium is provided for allowing data to be recorded on, erased from, and reproduced from, and storing information about power levels of an erase pulse. The recorded erase pattern information may include information about power levels of first an... | 09/13/2011 |
| 8009546 | Over current protection device An over current protection device is described. It includes a plurality of input channels for receiving an input signal; a plurality of low pass filters coupled to a first group of the plurality of input channels, wherein each low pass filter is associated with one ... | 08/30/2011 |
| 8004957 | Recording and reproducing method and recording and reproducing apparatus A recording and reproducing method has a recording pulse generating step of generating a recording pulse to set timing of a beam emitted from a laser according to data to be recorded on an information recording medium; a laser power control step of controlling a las... | 08/23/2011 |
| 8000211 | Optical disc apparatus and method for controlling the same An optical disc apparatus capable of obtaining an effect to reduce the laser noise without shortening the laser diode service life or increasing the power consumption. The optical disc apparatus includes a laser diode for emitting a laser beam, a laser driver for dr... | 08/16/2011 |
| 7995447 | Method for controlling read power and open-loop read control device using the same A method for controlling read power and an open-loop read control device using the same. The open-loop read control device is used in an optical disk writer and includes a memory, a DAC and an amplifier. The optical disk writer includes a pickup head device having a... | 08/09/2011 |
| 7965612 | Optical head, and information recording-and-regeneration apparatus An optical head that is restrained from becoming larger, even if it is used for an optical-information recording medium that includes a plurality of information recording layers. In this optical head, a collimating lens is formed by a concave lens disposed on the si... | 06/21/2011 |
| 7961584 | Operating current modifying device and method An operating current modifying device is provided for a power generating element. The power generating element generates an output power when the operating current is larger than a threshold current in the power generating element. A functional relationship is betwe... | 06/14/2011 |
| 7948858 | Optical information processing apparatus, optical pick-up device and optical recording disc system An optical pick-up device includes a laser source enabling emission of at least two light beams with different wavelengths, an objective lens which focuses the light beams emitted from the laser source on an optical disc, an optical detector which receives a light r... | 05/24/2011 |
