Matches 1 - 49 out of 49
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7177236 Optical disc head including a bowtie grating antenna and slider for optical focusing, and method for making  
A slider system have been developed to aid in the spacing between read/write heads and the storage medium, and a grating antenna amplifier has been developed to improve illumination spot size and...
7078674 Optical pickup device emitting linear polarized light with a 45 degree phase difference  
The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam splitter,...
6650615 Optical recording medium and recording and/or reproducing method and apparatus employing the optical recording medium  
An optical recording medium is capable of linear recording in a photon mode. An organic material changed in molecular orientation on light illumination to exhibit birefringence is used as a...
6243326 Recording and reproduction device for a magneto-optic recording medium capable of recording information according to optical super-resolution  
A magneto-optic disk and a recording/reproduction device therefor adopt optical super-resolution to increase recording capacity. More specifically, the magneto-optic disk has an heat emitting layer...
5966347 Apparatus and method for reproducing data from a magneto-optic recording medium  
A data reproducing device and method for reproducing data recorded on a magneto-optic recording medium having at least a recording layer and a reproducing layer. The device and method include a...
5907525 Magneto-optical disk, optical pickup, and magneto-optical disk drive  
A magneto-optical disk including a transparent substrate, pit strings containing information formed in spiral or concentric form on a surface of the transparent substrate, a magneto-optical...
5796683 Magneto-optical recording device having a controllable polarizing filter  
An information recording and reproduction apparatus for a magnetically induced superresolution magneto-optical recording medium includes an optical head that emits a laser beam to a signal...
5777974 Optical head and magneto-optical reproducing apparatus using the same  
In an optical head for radiating a light spot on a magneto-optical recording medium and detecting light received via the medium, there are provided a light source, a condenser lens for condensing...
5712840 Optical information recording/reproduciing apparatus having two-division detectors  
An optical information recording/reproducing apparatus is disclosed. In the apparatus, a light beam polarized in a predetermined direction is irradiated onto an opto-magnetic recording medium to...
5708645 Semiconductor laser device to detect a divided reflected light beam  
An optical device for detecting a magneto-optical signal can be simplified and miniaturized in arrangement. An optical device for detecting a magneto-optical signal includes an optical element in...
5661701 Optical pickup using split beams impinging on different photodetector areas  
Optical pickup apparatus using split beams impinging on different photo-detector areas includes optical structure for projecting a light beam polarized in a predetermined direction toward a...
5652745 Optical system using polarized light with prevention of effect of birefringence  
An optical system using polarized light is provided wherein a polarized light beam from an optical source is made to coincide with the natural polarization of the optical element acting upon the...
5615181 Optical read/write head with low angle beam splitter and coplanar detectors  
An optical read/write head for a magnetic-optic recording and reproducing unit having a beam splitter placed between a collimator lens and an objective lens. The optical path of the beam reflected...
5561655 Apparatus and method for differential tracking in a magneto-optic data storage system using mark edge detection  
An apparatus and method for providing a tracking error signal in an optical system in which a radiation beam is applied to an optical storage medium having a number of marks formed thereon. A...
5519675 Polarization detector optical head  
An optical head comprising of a laser source, a collimating lens, a focusing lens, a beam splitter, two polarizers, a quarter wave retarder, three detector lenses, and three photo detectors can be...
5511060 Magneto-optical head with a three prism beam splitter to split a reflected beam into three beams  
An optical system of reflected light path of a magneto-optical head, comprising very few parts that can be easily manufactured and assembled at a low cost. The present invention makes use of a beam...
5488592 Optical pickup device for magneto-optical disc reproducing system  
An optical pickup device having a simple structure due to many less components is disclosed. A laser beam generated in a laser diode is transformed into a parallel laser beam. The laser beam is...
5471440 Magnetooptic apparatus with integrated detecting element providing signal with high S/N ratio  
In an apparatus for recording and reading out magnetooptic information an incident light beam polarized in a predetermined direction is modulated by rotating a plane of polarization in accordance...
5416764 Noise component reduction in the data signal and optical scanning device  
A system for reducing noise in a data recording/play-back device includes an optical system for scanning a recording medium and providing first and second polarization signals. The polarization...
5406532 Optical system for a magneto-optical recording/reproducing apparatus  
A system for a magneto-optical information recording/reproducing system has a polarizing beam splitter for splitting a light beam reflected by a magneto-optical disk, which utilizes the Kerr...
5329517 Optical information recording and reproducing apparatus utilizing a plurality of recording light spots  
An optical information recording and reproducing apparatus for recording information pits on an information track by irradiating a light beam focused into a fine spot onto the information track of...
5278811 Magneto-optic recording and playback system  
A magneto-optic reading apparatus includes a laser light source for generating a linearly polarized light beam and a quarter-wave plate which converts the linearly polarized light beam into a...
5235588 Magneto-optic reading and recording head using external resonator having semiconductor laser  
A magneto-optic disc recording and reading head having an orthogonal two mode oscillation type of external resonator having a semiconductor laser, including a device for differentiating the...
5218582 Magneto-optic readout using a polarization-preserving optical guide  
Apparatus for reading out information magneto-optically recorded in a magnetic layer comprises a single, polarization-preserving optical guide (e.g., an optical fiber or two-dimensional waveguide)...
5210548 Method and system for reducing surface reflections from a photosensitive imaging member  
A raster output scanner (ROS) system is configured to direct a scanning beam of light against a surface of a photosensitive imaging member at the Brewster angle is determined by the angle of...
5202878 Optical recording and reproducing method and apparatus for the same  
According to the present invention, recording laser beam is shot from a semiconductor laser to form a mark set which comprises a pair of marks on the track of an optical recording medium in the...
5182735 Magneto-optic readout apparatus using polarization switching of readout beam  
A magneto-optic playback apparatus which plays back information from a recording layer (RL) which exhibits different light absorption of left and right circular polarized beams emitted from a laser...
5153868 Magneto-optic recording and regenerating device  
A magneto-optic recording and regenerating process and the device using it in accordance with the present invention are intended to magnetize the magnetic, or magnet, film of a disk parallel to the...
5119352 Magneto optic data storage read out apparatus and method  
A magneto optical head assembly combining a single high extinction polarizing beam splitter utilized to separate and analyze a light beam, a pair of half-wave plates, each having a fast axis with...
5105399 Magneto-optical means for reading disks by comparing signals at leading and trailing edges of laser beam  
Recording medium on which information is magneto-optically recorded is irradiated with a linearly polarized light beam. A light beam reflected from or passed through the recording medium is changed...
5073888 Optical pickup device  
An optical pickup device for recording, reproducing or erasing an information, comprises a sole semiconductor laser beam source for emitting a luminous flux, a polarizer for receiving the luminous...
5014253 Optical pick-up for selective playback and recording on a magneto-optically recorded medium  
An optical pick-up for selective playback and recording on a magneto-optically recording medium, in which light is projected from a source onto the medium. The light is provided with a direction of...
4989189 Magneto-optic playback apparatus including astigmatic diffracting means  
Apparatus for playing-back information on a magneto-optic recording element includes a diffraction grating for splitting a read beam reflected from the recording element and modified by the...
4985880 Optical information recording and reproducing apparatus  
An improved optical information recording and reproducing apparatus which is capable of detecting recording errors simultaneously with recording function for reduction of recording time, without...
4974219 Polarizing beam splitter using dielectric multilayers  
An optical analyzer for determining changes of the polarization plane in a light beam (4) comprises a substrate (20) supporting a photodetector array (21) and a system of imaging mirrors (22-24)...
4959821 Optical pick-up for scanning a magneto-optically recorded medium  
An optical pick-up for scanning a magneto-optically recorded disk in which the disk reflects a first principal beam onto a first photodetector. This first principal beam has a plane of polarization...
4955006 Floating type magneto-optic disk reading head system having external semiconductor laser resonator operating at orthogonal two mode oscillations  
A magneto-optic disk reading head system including an external semiconductor laser resonator. A magneto-optic disk forms a part of the external resonator. In the external resonator, orthogonal two...
4918675 Magneto-optical head with separate optical paths for error and data detection  
A magneto-optical head using a laser source unit with a focus error and a tracking error detector in substantially the same optical path as the originating laser beam. In this invention the stored...
4873678 Optical head and optical information processor using the same  
An optical head and an optical information processor using the optical head include a light source, focusing device for focusing a light beam which is emitted from the light source, on an...
4845696 Apparatus for optically recording and reproducing information in record tracks on a rotatable record disk  
Apparatus for recording and reproducing information in record tracks on a rotatable record disc comprises a disc driving portion for rotating the rotatable record disc about an axis of rotation, a...
4813032 Magneto-optical information reproducing apparatus in which the azimuth angle of the transmission axis of an analyzer is optimized so that the C/N ratio of a reproducing signal is maximum  
In a magneto-optical information reproducing apparatus, the angle θA formed between the optic axis of an analyzer for analyzing reflected or transmitted light from a recording medium and a...
4785438 Magneto-optical disc reproducing apparatus with improved two-part head  
A reproducing apparatus for magneto-optical discs has a moving head portion and a fixed head portion. Light reflected from the disc is divided into two parallel light beam components having...
4779250 Magneto-optical signal read-out system using divided photodetector  
A magneto-optical signal read-out system for a magneto-optical player in which the polarized plane of linearly polarized incident light is rotated when the incident light is reflected by or passes...
4773053 Optical system for guiding the read beam in a magneto-optical storage  
An optical system for guiding a read beam and a magneto-optical storage which utilizes a single beam splitter inserted in the beam path of a linearly polarized light beam directed onto a storage...
4654837 Magneto-optic transducer with enhanced signal performance  
A magneto-optic transducer for providing an optical indication of variations in magnetization in a magnetic storage medium located along a predetermined path. The transducer has a thin film of...
4654839 Optical head  
In an optical head for effecting the recording of information onto a recording medium or the reproduction of information from the recording medium, a light beam supplied from a light source unit is...
4638470 Apparatus using beam splitter cube with specific characteristics for reading information recorded in a magneto-optic medium  
A system for providing a read signal from a magneto-optic medium wherein a non-rotated leaky beam splitter is utilized to provide both s and p components of the light reflected from the medium to a...
4599714 Photo-magnetic reproducing apparatus  
Disclosed is a photo-magnetic reproducing apparatus in which an incident light beam polarized in a predetermined direction enters a recording medium on which information is magnetically recorded....
4569035 Magneto-optical information reading apparatus  
This specification discloses a magneto-optical information reading apparatus which comprises a device for causing a light beam polarized in a predetermined direction to enter a magnetic recording...
Matches 1 - 49 out of 49