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| Number | Title | Issue Date |
| 7224644 | Head arrangement for domain expansion magnetic amplifying magneto-optical system A head arrangement for reading a magneto-optical recording medium (10) having a storage layer and a read-out layer, includes an improved field generating device for generating a magnetic field used for copying a written mark from said storage layer to said re... | 05/29/2007 |
| 7139228 | Device and method for recording data to optical disk using recording pulse with corrected edge position The present invention provides a device and method for an optical disc such as a DVD which can keep proper edge position of a recording pulse to record data of high quality without depending on a fluctuation in a supply voltage and a fluctuation in a temperature. Th... | 11/21/2006 |
| 7139227 | Device and method for recording data to optical disk using recording pulse with corrected edge position The present invention provides a device and method for an optical disc such as a DVD which can keep proper edge position of a recording pulse to record data of high quality without depending on a fluctuation in a supply voltage and a fluctuation in a temperature. Th... | 11/21/2006 |
| 7127729 | Magneto-optical head and magneto-optical disk drive A magneto-optical head including a lens forming a light spot on a storage disk, a magnetic field generating coil arranged between the lens and the disk to surround the optical center of the lens, and an annular heat sink arranged around the coil. The distance betwee... | 10/24/2006 |
| 7092190 | Dynamic power supply Briefly, descriptions of embodiments for, at least practically, reducing the power consumption of a mass storage device are provided. The present disclosure relates to at least partially reducing the power consumption of a mass storage device and, more particularly,... | 08/15/2006 |
| 7092185 | Write gate timing for a servo bank A recording system records sector information on a recording medium, such as a hard disc drive, using a write gate signal. Timing of the write gate signal enables writing a servo data patterns over the servo wedge fields of the disc and, if the hard disc drive conta... | 08/15/2006 |
| 7061193 | Motor drive apparatus A position detection section 10 outputs a position signal 101 indicating the relative position between motor windings L1 to L3 and a rotor 60. A crossing detection section 20a outputs a rotation signal 241 indi... | 06/13/2006 |
| 6970316 | Write head driver circuit and method for writing to a memory disk A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally prov... | 11/29/2005 |
| 6970400 | Information recording medium with magnetic marks, recording and reproducing apparatus therefor, and head positioning method using detected magnetic leakage fields from the magnetic marks A recording and reproducing apparatus including a recording magnetic head and a reproducing magnetic head with their floating height lowered for high density recordation and reproduction is provided. An information recording medium is provided on which it is possibl... | 11/29/2005 |
| 6952383 | Optical disc device with a wobble control circuit An optical disc drive for accessing data stored on an optical disc is disclosed. The optical disc drive includes: a sled inside the optical disc drive, the sled sliding relative to the optical disc; an actuator on the sled, the actuator wobbling relative to the opti... | 10/04/2005 |
| 6917567 | Coil driving system, information storage apparatus, and driving method A predetermined electric current is supplied to coil by changing a pulse width of a voltage applied to the coil according to a current instruction value. An electric current which flows through the coil is detected; the thus-detected current value is compared with t... | 07/12/2005 |
| 6856582 | Method for driving magnetic head and driving circuit of magneto-optical disk drive A driving circuit for a magnetic head that is used for modulating magnetic field in a magneto-optical disk drive is provided, which reduces power consumption even if the magnetic head has large inductance. The driving circuit comprises a switching circuit for genera... | 02/15/2005 |
| 6826129 | Method and apparatus for recording magnetized mark utilizing magnetic field generated by adjacent magnetized mark to reduce energy level for generating pulsed magnetic field A method and apparatus for magnet-optical recording are provided that can reduce heat in pulse driving of a magnetic head coil of a magnet-optical recording apparatus. Data inversion detection means 41-44 generates a signal TRDET that becomes the high level w... | 11/30/2004 |
| 6754141 | Recording medium, method for recording and reproducing data using the medium, and magneto-optical recording apparatus A magneto-optical recording medium, a method for recording and reproducing data using the medium and a magneto-optical recording apparatus are provided in which an optical head reads the recorded data while applying a magnetic field, and the ill effect of the leakag... | 06/22/2004 |
| 6697305 | Magnetic head with sectioned magnetic field regulator A magnetic head includes a multi-layer coil for generating a magnetic field, and a flat, magnetic field regulator spaced from the coil along the central axis of the coil. The field regulator is formed with a center hole for passing disk-illuminating light... | 02/24/2004 |
| 6657926 | Magnetic field modulation coil A driver in a far-field magneto-optical ("MO") system has a read/write head that includes an objective lens for focusing a laser beam onto an MO disk. The objective lens is housed in an objective lens holder. A magnetic biasing coil is mounted to the bott... | 12/02/2003 |
| 6477119 | Magnetic head drive circuit including paired auxiliary coils, paired switching elements, and switch element control circuit, and magneto-optical recording device using the same To provide a magnetic head drive circuit or a magneto-optical recording device used with the circuit including a pair of auxiliary coils and a magnetic field generating coil for generating a magnetic field by alternately receiving electric currents flowin... | 11/05/2002 |
| 6426923 | Magnetic head drive circuit and magnetic recorder A magnetic head drive circuit comprises a control circuit for receiving a recording signal for recording data on a recording medium with use of magnetism and producing a control signal based on the recording signal, and a switch circuit comprising switchi... | 07/30/2002 |
| 6278665 | Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating same An optical drive system includes a computer that monitors the current in the bias coil of a magnetomotive field generator to determine when a predetermined current threshold is exceeded. When the threshold is exceeded, a sufficiently strong magnetic field... | 08/21/2001 |
| 6236625 | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same A magneto-optical drive system having a computer that monitors the current in the bias coil of a magnetomotive field generator to determine when a predetermined current threshold is exceeded. When the threshold is exceeded, a sufficiently strong magnetic ... | 05/22/2001 |
| 6018505 | Magneto-optical disc apparatus In a magneto-optical disc apparatus using an initializing magnetic field generator, the magnetic field generator including a permanent magnet slides on or and floats above a surface of the magneto-optical disc for applying a magnetic field at a position o... | 01/25/2000 |
| 5991242 | Magnetic head drive device, and magneto-optical recording apparatus using the same A magnetic head drive device includes a magnetic head having a main coil for magnetic field generation. Current is supplied to the main coil via first to fourth current supply channels. A first auxiliary coil is provided in the first current supply channe... | 11/23/1999 |
| 5970026 | Temperature invariant, magneto-optic modulator coil driving circuit A magnetic modulator coil driving circuit comprises: first and second switching elements for inverting the polarity of exciting currents supplied to magnetic modulator coils, first and second bias voltage setting circuit for determining control voltages t... | 10/19/1999 |
| 5748573 | Magnetic head driving circuit, including magnetic head coil switching circuits and a control pulse generator for the switching circuits, which is operable with recording data transferred at a higher than normal transfer rate In a magneto-optical recording apparatus wherein a beam of light is irradiated upon a face of a recording medium while a magnetic field is applied to the other face of the recording medium at a location where the light beam is irradiated, production of co... | 05/05/1998 |
| 5724319 | Magneto-optical recording apparatus having transient response correction for magnetic head coil currents A magneto-optical recording device includes a magnetic field generating coil for generating a magnetic field on a magneto-optical recording medium, a power source for supplying a current to the magnetic field generating coil, switching circuit for driving... | 03/03/1998 |
| 5721714 | Method and apparatus for controlling bias levels in a magneto-optical recording device An apparatus for controlling a magnetic field strength of a bias coil at a focal point of a lens during recording on a medium. The apparatus includes a first controller for determining a distance between the focal point of a lens and a reference point on ... | 02/24/1998 |
| 5666333 | Biasing level controller for magneto-optical recording device There is disclosed an apparatus for controlling the strength of a magnetic field, comprising a first controller, a second controller, a digital-to-analog converter, a current driver, and a bias coil. The first controller determines the position of the foc... | 09/09/1997 |
| 5654943 | Magnetic head driving circuit operable with recording data transferred at high transfer rate and magneto-optical recording apparatus employing the magnetic head driving circuit In a magneto-optical recording apparatus wherein a beam of light is irradiated upon a face of a recording medium while a magnetic field is applied to the other face of the recording medium at a location where the light beam is irradiated, production of co... | 08/05/1997 |
| 5587851 | Magnetic head driving device with prerecording energization A magnetic head driving device is disclosed. The device includes an inductor for generating a magnetic field, the inductor having a pair of terminals. The device has a first auxiliary coil for storing electromagnetic energy, the first auxiliary coil being... | 12/24/1996 |
| 5586091 | Magnetooptical recording apparatus including a control circuit for driving a switch element between on and off states in accordance with an error detection In a magnetooptical recording apparatus, a light beam is radiated onto a magnetooptical recording medium while applying a bias magnetic field to the recording medium in such a manner that at least one of the light beam and the bias magnetic field is modul... | 12/17/1996 |
| 5579293 | Magnetic head driving circuit for controlling switching operations in a magnetooptical recording apparatus A magnetic head driving apparatus is provided with a pair of switch elements for switching a direction of a current to be supplied to a magnetic head. ON/OFF operations of the pair of switch elements are controlled in correspondence with an information si... | 11/26/1996 |
| 5574702 | Magnetic head current control circuit for use in a magnetic head drive device, and magnetic/magnetooptical recording apparatus using the same A magnetic head drive device includes a pair of auxiliary coils, a pair of switch elements respectively connected in series with the pair of auxiliary coils, and a magnetic head. The magnetic head is arranged between a node of the pair of auxiliary coils ... | 11/12/1996 |
| 5566147 | Magneto-optical recording apparatus and method for modulating the strength of a generated magnetic field into three levels A magneto-optical recording apparatus and method using a magnetic field modulation for forming a magnetic domain on a magneto-optical record medium by applying an external magnetic field which is modulated by record data, while applying a light beam spot ... | 10/15/1996 |
| 5559763 | Magnetic head driving device and magnetooptical recording apparatus with acceleration coil for shortening current inversion time A magnetic field generation device generates a magnetic field modulated according to an information signal by switching the direction of a current to be supplied to a magnetic field generation coil of a magnetic head, according to the information signal. ... | 09/24/1996 |
| 5500839 | Multiple coil magnetic head for magnetic optical recording device A magneto-optical recording and reproducing apparatus includes a magnetic head for modulating a magnetic field according to a recording signal. There are three separate coils around a single magnetic core the magnetic head. Three coil driving circuits are... | 03/19/1996 |
| 5477509 | Magneto-optical head circuit for minimizing the overshoot reversing current An apparatus for generating a modulated magnetic field includes a magnetic head coil and a pair of additional inductive coils. The ratio of the average inductance of the additional inductive coils to the inductance of the head coil is from 2 to 8. The app... | 12/19/1995 |
| 5448422 | Magnetic head drive circuit including capacitors for storing charge to drive a magnetic head coil A drive circuit apparatus for driving a magnetic head includes a magnetic core, a coil wound around the magnetic core, and a unit for supplying current to the coil. The supplying unit includes first and second capacitors and a charging unit such that the ... | 09/05/1995 |
| 5394380 | Magneto-optic recording apparatus and method therefor In a magneto-optic recording method and apparatus, an optical head irradiates a magneto-optic recording medium with a light beam, a magnetic head applies a modulated magnetic field to the recording medium to record a signal on the recording medium, a driv... | 02/28/1995 |
| 5377172 | Modulated magnetic field generation circuit for magneto-optical disks A modulated magnetic field generation circuit is used in a disk recording apparatus which can overwrite data on a magneto-optical disk. The modulated magnetic field generation circuit includes a first coil for applying the magnetic field modulated for rec... | 12/27/1994 |
| 5313444 | External magnetic field generation apparatus capable of light intensity modulation and magnetic field modulation An external magnetic field generation apparatus is used for a recording and reproduction apparatus which records information on a magneto-optical recording medium based on the magnetic field modulation system and the light modulation system, and applies a... | 05/17/1994 |
