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| Number | Title | Issue Date |
| 7352658 | Method for recording information data to a recording medium by irradiation with a light beam and application of a magnetic field A magnetic recording medium comprises a first magnetic film and a second magnetic film on a substrate. The second magnetic film is composed of a magnetic material preferred for recording and reproduction, and the first magnetic film is composed of a ferrimagnetic ma... | 04/01/2008 |
| 6967458 | Decreasing spin up time in a disk drive by adjusting a duty cycle of a spindle motor PWM signal to maintain constant average input current A disk drive is disclosed comprising a spindle motor for rotating a disk, wherein the current applied to the spindle motor is controlled by adjusting a duty cycle of a pulse width modulated (PWM) signal. A current sensor generates a current sense signal representing... | 11/22/2005 |
| 6944102 | Magneto-optical reader which is optimized by the incident-light polariser A magnetooptic read device in which the figure of merit is optimized mainly by the setting of the incident light polarizer. The component of the incident wave pumps the magnetooptic transducer. The component of the incident wave amplifies the variations in the magne... | 09/13/2005 |
| 6922350 | Reducing the effect of write disturbs in polymer memories The write disturb that occurs in polymer memories may be reduced by writing back data after a read in a fashion which offsets any effect on the polarity of bits in bit lines associated with the addressed bit. For example, each time the data is written back, its pola... | 07/26/2005 |
| 6741528 | Magneto-optical head device P-polarized parallel rays are irradiated on a magneto-optical disk 1 and reflected. The reflected light is reflected by a first beam splitter 14 and supplied to a reproduced signal detection system 20. This reflected light is supplied to a light... | 05/25/2004 |
| 6714370 | Write head and method for recording information on a data storage medium A recording head for use in conjunction with a magnetic storage medium, comprises a waveguide for providing a path for transmitting radiant energy, a near-field coupling structure positioned in the waveguide and including a plurality of arms, each having a planar se... | 03/30/2004 |
| 6504797 | Magneto-optical recording medium having multiple magnetic layers and reproducing method thereof A magneto-optical recording medium includes a first magnetic layer and a second magnetic layer. The first magnetic layer is an in-plane magnetized film at room temperature, but changes to a perpendicular magnetized film at a predetermined temperature high... | 01/07/2003 |
| 6026070 | Optical pickup device An optical pickup device using a polarizing optics system is characterized in that the polarization beam splitter comprises a polarizing film having optical properties of transmittance and reflectivity satisfying the following formulas (1) and (2): T... | 02/15/2000 |
| 6002653 | Magneto-optical head unit capable of compensating the Kerr ellipticity A magneto-optical recording medium has a substrate and a magneto-optical recording film. The substrate is formed from material having light transmittivity. On one surface of the substrate there is provided a magneto-optical recording film. In said one sur... | 12/14/1999 |
| 5790504 | Integrated optical head with an emitting light splitting polarizing prism and a detecting light splitting polarizing element A magneto-optical pick-up for recording and reproducing information to an information recording medium comprises an optical module comprising an integral light emitting element and receptor element having plural light reception areas, and a diffraction gr... | 08/04/1998 |
| 5661711 | Optical recording and reproducing apparatus An optical head has a first light source for emitting a first light beam having a first wavelength, a second light source for emitting a second light beam having a second wavelength larger than the first wavelength, and an optical system for guiding the f... | 08/26/1997 |
| 5550798 | Enhanced optical beam splitter to increase the kerr rotation angle An optical head apparatus for a magneto-optical recording medium including a light beam source, an objective lens, a separating optical system, and a photodetector. The objective lens is provided for irradiating an output light beam from the light beam so... | 08/27/1996 |
| 5528576 | Optical head including a halfwave plate and a monaxial crystal for splitting a light beam into two orthogonal, polarized light beams An optical head for use in a magnetooptical record/reproducing apparatus includes a light source emitting a linearly polarized light beam guided to a polarized direction rotating element to rotate the polarized direction of the light beam. The light beam ... | 06/18/1996 |
| 5073879 | Information processing apparatus using a beam splitting means having non-polarization beam split surface In an optical head, a light beam is emitted from a semiconductor laser which is rotatably supported and is guided to an optical disk through a beam splitter having a non-polarization beam split surface. The light beam reflected from the optical disk is re... | 12/17/1991 |
| 5070494 | Optical pickup device with dual-mode drive mechanism An optical pickup device for optically reproducing an information recorded on a recording medium of a magneto-optical disc or a write-only-read-many optical disc, includes a semiconductor laser, an objective lens for converging the laser light emitted by ... | 12/03/1991 |
| 4993012 | Record face identifying device for magneto-optic record medium A magneto-optic record signal processing system uses a linearly polarized light beam to be projected onto a magneto-optic medium and a recorded signal is reproduced by analyzing the polarized conditions of a reflected light beam from the medium. This proc... | 02/12/1991 |
| 4965780 | Magneto-optical data recording device using a wavelength and polarization-sensitive splitter An optical mass storage device for use in data processing systems. Two or more lasers provide separate read and write laser beams having different wavelengths. The read and write laser beams can be orthogonally polarized. A polarizing beam splitter combin... | 10/23/1990 |
| 4935911 | Optical head device for recording and reproducing information An optical head device for recording and reproducing information includes beam splitting and converging mechanisms which has a first portion and a second portion secured to the first portion and is disposed on an optical path of light reflected from a pho... | 06/19/1990 |
| 4833662 | Reproduction apparatus for a magneto-optical recording medium A reproduction apparatus for an optical magnetic disk having data recorded in a magneto-optical recording form and an address recorded in an optical recording form, includes a pickup for detecting P- and S-axis components of a linearly polarized laser bea... | 05/23/1989 |
| 4823220 | Detector for magnetooptic recorders A modulated light beam, as received from a magnetooptic record medium, carries information in the form of linear polarization rotations having P and S components, herein also referred to as light-phase modulated light. A phase-to-intensity converter optic... | 04/18/1989 |
| 4797868 | Optical system employing a laser beam for focusing, tracking and transferring information signals with respect to a magneto-optical memory An optical system for use with an optical memory including an optical arrangement for separating light reflected from the surface of the optical memory into a plurality of different resultant beams. This optical mechanism comprising four reflecting surfac... | 01/10/1989 |
| 4737947 | Recording medium having optomagnetic recording layer and optical recording layer with guide tracks of specific reflectance An optical recording medium comprising a substrate, an optomagnetic recording layer made of a magnetic film where information can be recorded and reproduced by irradiation with a light beam, and an optical recording layer which can be modified in optical ... | 04/12/1988 |
| 4729122 | Magneto-optical reproducing head of a high light utilization rate In a magneto-optical reproducing head including first and second beam splitters (21, 22) and a Faraday effect member (25) between the splitters to suppress return to a laser beam source (11) of a reversed laser beam reversedly sent from a magneto-optical ... | 03/01/1988 |
| 4721368 | Optical system in a magneto-optical memory device A magneto-optical memory device includes a recording medium having a magnetic anisotropy in a direction perpendicular to the main surface thereof. A semiconductor laser is employed in an optical system of the magneto-optical memory device for reproduction... | 01/26/1988 |
