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Match Document Document Title
8147069 Lighting device and projection image display unit  
A lighting device, including a first light source emitting light of a first wavelength; a second light source close to the first source, emitting light of a second wavelength in almost a same...
8130622 Optical pickup apparatus having multi-sectional polarizer  
An optical pickup apparatus includes a light generating unit to generate a light to record or reproduce information, an objective lens to focus the light generated from the light generating unit...
8023369 Storage system and optical pick-up unit  
Disclosed herein are aspects of optical tape technology, tape manufacturing, and tape usage. Methods and systems of tape technology disclose optical tape media including: configurations,...
7859977 Optical pick-up unit  
An optical pick-up including a fold mirror having an achromatic quarter-wave plate coating is provided. To allow the thin film coating to efficiently provide the quarter-wave retardation, the...
7639588 Optical disc drive apparatus  
The amount of reflected light from an adjacent layer in a multilayer optical disc is reduced by means of a combination of half-wave plates having different optical axes and a flat mirror. The...
7525880 Near-field information reproducing apparatus and near-field information reproducing method  
An information reproducing apparatus has a light source for generating linearly polarized light, a medium having linear marks disposed in overlapping relation to one another, and an optical head...
7444047 Multiplexing optical system  
A multiplexing optical system includes collimator lenses, a first condensing lens, a second condensing lens and an optical fiber. The collimator lenses collimate divergent laser beams that have...
7417936 Optical pickup reducing noise and polarization changer  
An optical pickup includes a laser light source, an objective lens which focuses light emitted from the laser light source on an optical information storing medium, an optical path changer which...
7224661 Wave plate and optical pickup unit using the same  
As a ½ wave plate constituted by laminating two wave plates, a wave plate where temperature dependence of a phase difference is reduced is provided. In a wave plate constituted by laminating a ...
7016290 Readout method and apparatus for optical information medium  
In an optical information medium comprising an information recording layer having a mark train of marks and spaces, the mark train is read out by scanning it with a laser beam and detecting a light...
6940801 Optical recording medium, optical recording and reproducing method and apparatus  
An optical recording medium, an optical recording and reproducing method, and an apparatus that can record and reproduce multilevel information at a high density and with a high S/N ratio....
6806956 Polarization detector and method for fabricating the polarization detector  
A polarization detector is described which contains a beam splitter, which disperses an incident light beam into partial beam paths. The partial beams pass though λ/4 wafers and a cholesterol ...
6804185 Optical pickup and information recording and/or reproducing apparatus including the same  
A variable optical unit is provided with at least two phase-shift regions for providing light with phase differences. Phase-shift amount of the phase-shift region is adjusted by the applied voltage...
6801491 Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof  
A focus error detecting apparatus and a focus error detecting method of an optical pickup in which the system is not easily influenced by track transversal noises and an optical disc thickness...
6594042 Optical element, optical pickup, information recording and reproducing method, and polarizing hologram  
An optical element that receives a first incident light and a second incident light through a main surface and allowing the first and second incident lights to be transmitted therethrough, the...
6512733 Optical recording method, optical recording apparatus, optical reading method, and optical reading apparatus  
The present invention provides an optical recording method, optical recording apparatus, optical reading method, and optical reading apparatus which are capable of high density recording an d high...
6504811 Optical information storage unit  
An optical information storage unit for reproducing information recorded on lands and grooves of a magneto-optical recording medium by means of a reflected light obtained from a luminous flux which...
6278681 Optical head, method of fabricating optical head, and apparatus for fabricating optical head  
There is provided an optical head including a laser diode chip, a lens for focusing lights onto an object, an optical separator for separating lights reflected from the object, from an optical axis...
5987002 Magneto-optical recording medium and method and apparatus for reproducing data therefrom  
A magneto-optical recording medium formed to record an information signal on both of lands and grooves provides a capability of reproducing an excellent signal with a small magnitude of crosstalk...
5920538 Magneto-optical readout method and magneto-optical readout head and method for making same  
A magneto-optical readout head for reading out magnetically stored data has a high optical quality substrate and a transducer applied to the substrate formed by a Faraday rotator and a Kerr...
5790501 Information reproducing device  
A laser beam emitted from a laser diode passes through a polarizing separating plane of a first polarization beam splitter and forms a beam spot on a magneto-optic disk. The plane of polarization...
5781524 High density optical head assembly  
A magneto-optical (MO) head has a pair of Faraday rotators between a polarizing beam splitter (PBS) and an objective lens for focusing light onto a MO disk. The pair of Faraday rotators rotate the...
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...
5740147 Phase compensation of optical elements by tilting a half wave plate in a magneto-optic disk head  
A laser beam emitted from a laser diode passes through a first polarization beam splitter to form a spot on a magnetic film of a magneto-optic disk. The plane of polarization of the laser beam...
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...
5701279 Optical information recording-reproducing apparatus including a light beam detector being divided by a division line extending in a direction perpendicular to an information track  
A minute light spot is irradiated on an information track on a recording surface of a recording medium from an optical head. When reproducing an information mark train recorded on the recording...
5668786 Magneto-optic disk apparatus having means for eliminating fluctuation component in reproduction magneto-optic signal  
A magneto-optic disk apparatus for use with a magneto-optic disk in which a recording surface made of a magneto-optic information recording medium is formed on a transparent substrate having a...
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...
5629916 Optical information reproducing device forming light spot on photo-detector with major axis along push-pull signal detection  
An optical information reproducing device for reading informations recorded on the opto-magnetic recording medium is disclosed. The device comprises a first beam splitter for separating an inward...
5621719 Optical disk and apparatus for reproducing the same  
An optical disk includes: an information recording surface; first surface-transformed portion array formed on the information recording surface and including first surface-transformed portions...
5621714 Optical pick-up apparatus having hologram and beam splitter with birefringent member and polarizing film  
An optical pick-up apparatus for reproducing information recorded on a magneto-optical record medium including a semiconductor laser emitting a linearly polarized laser beam, and a polarizing film...
5617398 In-line optical pickup using Wollaston Prism and collimating lens directing polarized light components to detectors  
An optical pickup includes a Wollaston prism for passing incident light generated from a light source and splitting reflected light from an optical disk into two polarized components, and two...
5581532 Optical information recording/reproducing apparatus for accurately detecting magnetic domain edges  
An apparatus for recording and reproducing information on and from optical or opto-magnetic information recording media is disclosed. The apparatus comprises an irradiation device for irradiating a...
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...
5517480 Magneto-optical information reproducing apparatus that splits a light beam into at least three light beams advancing in the same direction  
A magneto-optical information reproducing apparatus includes a device for irradiating a light beam polarized in a predetermined direction onto a recording medium having information magnetically...
5504722 Magneto-optic information storage system utilizing a TE/TM mode controlling laser diode  
A semiconductor laser apparatus includes a semiconductor substrate, a first cladding layer, an active layer, a second cladding layer, a second electrode, and a pair of resonator mirrors. The...
5502708 Optical scanning device  
In a combined optical and magneto-optical recorder, data stored in pits and a magnetic layer may be simultaneously detected with an optical scanning device. Reflected light is divided by a...
5483509 Optical pick-up device with error detection using P-wave  
An optical pick-up device capable of accurately detecting focus errors, tracking errors, magneto-optic signals and pit signals recorded on an optical disc by use of a dichotomous hologram and...
5483508 Optical recording and reproducing apparatus using a hologram to detect and judge a plurality of pit patterns  
An optical recording and reproducing apparatus records two rows of a plurality of pit patterns with respect to one track by modulating two light beams and by converging the modulated two light...
5479387 Optical head including multiple photo detectors for reading signals and error signals for servoing from both a read-only recording medium and a magneto-optical recording medium  
An optical recording/reproducing head device which includes a diffraction grating for splitting a light beam radiated from a light source into at least three light beams, an objective lens for...
5459707 Read/write CD ROM system using an electro-optic modulator to crosstalk  
In a CD system of the type which stores data in both pits and magnetic domains, crosstalk injected into the signal recovered from the magnetic domains is significantly reduced by causing the...
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...
5396061 Opto-magnetic recording polarization optical apparatus having a light absorbing film and a total reflection film  
In an optical apparatus according to the present invention, a light-absorbing film is formed between a light-receiving element and an optical semitransparent film formed on the light-receiving...
5392274 Optical pickup device  
In an optical pickup device, signal light is reflected on an optical disk and is converged by a condenser lens. A polarizing plane of the signal light is rotated 45° by a 1/2 wave plate. The ...
5365508 Magneto-optical read/write device  
A magneto-optical read/write device having a radiation detection system which includes two radiation-sensitive detectors the outputs of which are connected via DC coupled current-to-voltage...
5337300 Signal sensing device of magneto-optic disk device for detecting error signal and information record signals with common photo sensor  
A signal sensing device is provided that includes an optical system having a first splitting function by which a beam reflected by a magneto-optic disk is split by a small amount, a second...
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...
5325350 Pick-up for selectively reading and writing an optical recording medium having pits and magnetic domains  
The beam of light reflected from an optico-magnetic recorded medium is reflected by an optical pick-up onto one optical or another in accordance with the direction that the beam's plane of...
5317555 Optical head device utilizing partially overlapping light spots to read information from a readout layer  
A magneto-optical disk has a recording layer whereon recorded bits are formed by the magnetic field modulation method and a readout layer whose axis of easy magnetization is parallel to the...
Matches 1 - 50 out of 90 1 2 >