Matches 151 - 200 out of 544 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
6487161 Objective lens and optical head for optical disc drive  
An optical head for an optical disc drive is provided with a first laser diode that emits a shorter wavelength laser beam, a second laser diode that emits a longer wavelength laser beam, and an...
6477129 Optical disc drive  
An optical disc drive using either one of a first disc (e.g., DVD) and a second disc (e.g., CD), is provided with a first laser diode that emits a shorter wavelength beam, a second laser diode that...
6452880 Optical pickup apparatus  
An optical pickup apparatus capable of reading information from recording media of different read wavelengths, includes a light-emitter having a first light source for emitting a first laser beam...
6449225 Method and apparatus for reading multiple tracks of an optical disk  
A multi-track optical disk reader is provided having an optical pickup including multiple reading beams arranged in a pattern, such that each beam is directed towards a track to be read. The...
6438075 Light-pick-up device and light source unit incorporated in the same  
A returning light beam from an optical disc is divided by a separating diffractor in the directions perpendicular to a track direction of the optical recording medium, and according to respective...
6430125 Methods and apparatus for detecting and correcting magnification error in a multi-beam optical disk drive  
Methods and apparatus are provided for detecting and correcting magnification errors while simultaneously reading or writing multiple data tracks with a multi-beam optical disk drive. An optical...
6411573 Multi-beam optical pickup  
An optical pickup for simultaneously reading a plurality of data tracks of an optical storage medium is provided. The optical pickup uses a diffractive element to split an illumination beam into a...
6400664 Optical head including electrical circuit which produces focus error signal and tracking error signal unaffected by variations in intensity distributions of reflected light beams  
An optical head eliminates an disturbance which occurs in a focus error signal in association with the decentering of an optical disk when an optical spot crosses a track on a storage film surface,...
6396780 Information storage apparatus and method for storing data  
The present invention provides an information storage apparatus generating a tracking error signal in which apparatus and method the differential push-pull method is applied to a three spot method...
6396790 Optical head and information recording and reproducing apparatus using it  
An optical head having a plurality of laser light source and a plurality of photodetectors corresponding to the plurality of laser light sources. The plurality of laser light sources have at least...
6392977 Optical pickup with a hologram to limit the aperture of two light beams with different wavelengths  
An optical pickup device that is able to record/reproduce information signals for first and second optical discs with different recording capacities. The optical pickup device includes an objective...
6388977 Hologram laser unit and optical pickup device including the same  
A hologram laser unit to be used for performing recording and reproducing operations of information for an optical disk, includes a light source, a photodetector, and a hologram element which are...
6388963 SIGNAL GENERATION METHOD, SIGNAL GENERATION METHOD USED IN OPTICAL DISK RECORDING AND REPRODUCING APPARATUS, OPTICAL PICK-UP USING SIGNAL GENERATION METHOD, AND OPTICAL DISK RECORDING AND REPRODUCING APPARATUS HAVING THIS OPTICAL PICK-UP  
A signal generation method capable of generating a cross track signal having a predetermined phase difference from a tracking error signal even in a land and groove recording method in which a land...
6385143 Method and apparatus of multibeam optical disc readout  
An optical pickup applies five different light beams at the same time to every second five tracks on a signal plane of a CD-ROM. A record data read system reads record data independently for each...
6373793 Multibeam optical disk readout method and apparatus  
In a CD-ROM reader system wherein five adjacent tracks of a CD-ROM are separately illuminated by five light beams of an optical pickup, a recorded data readout system simultaneously reads the...
6370092 Optical pickup and optical disk drive for use with a high-density optical disk  
An optical pickup for reading information from a recording medium comprises a light illuminating portion for illuminating a plurality of light beams having different wavefronts onto a recording...
6366543 Optical pickup for discriminating between and reading different types of optical discs  
An optical pickup including a light source for radiating a light beam, a diffraction element for separating a light beam radiated from the light source into at least three beams, namely a main beam...
6366547 Ultra high density disk reader/writer comprising two interferometers  
An optical apparatus for reading from and writing to an ultra high density disk and comprising a light source emitting a pencil of light rays to an optical path along an optical axis; two...
6363046 Optical recording/pickup head compatible with a digital versatile disk (DVD) and a recordable compact disk (CD-R) using a holographic variable aperture  
An optical recording/pickup head having compatibility with a recordable compact disk (CD-R) and a digital video disk (DVD) transmits a first light beam having a wavelength of 635 nm for a DVD...
6341118 Multiple channel scanning device using oversampling and image processing to increase throughput  
A multiple channel scanning device has a scanning head with multiple columns of apertures that emit light which is projected to a small spot on the surface of a recorded medium. Light returned from...
6339563 Optical pickup apparatus capable of suppressing offset of a tracking error signal  
A grating surface of a diffraction grating diffracts a laser beam emitted from a semiconductor laser device in ±1st order directions. The grating surface is formed in a rectangular or elliptic...
6282164 Optical head having a phase-shifting diffraction grating  
An optical head having a phase-shifting diffraction grating includes a diffraction grating for dividing the light from a light source into a plus first order diffracted light, a zero order light,...
6278680 Initial crystallization method of recording media and device thereof  
An initial crystallization method of a recording medium such as a phase-change optical disk, which comprises forming a light spot composed of at least two flat elliptical beam spots each having a...
6278679 Supra-density optical photochromic rewrite data access system  
The invention provides a near-field photochromic device for a supra-density optical memory, comprising a scanner carrying a data storage medium, an optical head having a tip, to be used for...
6269066 Electronically translocatable optical stylet  
A composite interferometer and electro-optical prism provide a means to control the position of a spot of light to read and write data on an optical disc. In this invention each light ray from a...
6256283 Optical pickup having a common light beam path for passing either of a plurality of kinds of light beams  
An optical pickup device has a single light beam path for common use in treating or passing either of a plurality of kinds of light beams for respective recording densities and/or...
6256272 Optical pickup  
Disclosed is an optical pickup. The optical pickup comprises an optical disc; a first light source having an astigmatic difference and emitting a first laser beam of a first predetermined...
6229771 Method and apparatus for generating focus error signals in a multi-beam optical disk drive  
A focus detection system for use in a multi-beam optical pickup assembly is provided that uses an optical element, either a holographic element or diffractive element, to split beams reflected off...
6219316 Recording or reproducing device for recording media having different track spacings  
A recording or reproduction device with a three-point scanning arrangement compatible for use with recording media having different track spacings. The invention makes it possible, without changing...
6215740 Control method for optical disk drive capable of accessing to target track quickly and the optical disk drive  
A control method for an optical disk drive is disclosed. In the control method, first and second light beams output from an optical head are irradiated to an optical disk. Information is recorded...
6212150 Optical pickup apparatus and optical recording medium drive employing the same including a first photo receiving element for detecting the state of light beam and a second photo receiving element for reproducing information  
First and second photodiodes are arranged on the upper surface of a stem, returned light beams diffracted in the + 1st order by a transmission type holographic optical element are received by the...
6205106 Memory card recording/reproducing with two light sources and a light value matrix  
Method of storing and retrieving information by exposing cells of a storage medium to a first beam of light having a first set of properties affecting the optical properties of said storage medium,...
6201780 Optical head with a phase plate for different types of disks  
The device has a first optical system 11 and a second optical system 12 which emit and receive laser light of different wavelengths, and is provided with light combining and dividing device...
6181666 Optical pickup  
An optical pickup comprises a plurality of light sources for generating recording and reproducing light of information, a plurality of optical elements for treating light beam generated from the...
6172958 Optical pick-up and disk player  
In order to provide an optical pick-up capable of carrying out write and read operations of information signals with respect to plural kinds of optical discs in which thicknesses of transparent...
6167004 Error signal detecting apparatus of optical pickup adopting hologram grating  
An error signal detecting apparatus for an optical pickup employing a hologram grating, including a sensing lens for focusing light reflected from a recording medium, a hologram grating having...
6154433 Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head  
An optical head device adapted to be optically coupled to an optical disk includes a light-source laser and an objective lens optically coupled thereto. This lens receives an output light of the...
6151289 Multibyte random access mass storage/memory system  
A multi-byte, random access, mass storage/memory system is capable of storing multigigabytes of information and communicating that information over various standard output channels at high transfer...
6151291 Device for optically reading digital data from a medium, particularly a laser disk reader device  
Optical reading device (1) for reading digital data from a reflecting medium (4), comprising a lighting source (8), means (10) for focusing the beam emitted by the source onto an area (S) of the...
6147951 Recorded information reproduction method and recorded information reproduction apparatus with multiple reading elements  
A reproduction apparatus for reproducing data recorded on a disk having a plurality of tracks includes a spindle motor for rotating the disk, N reading components (N being a positive integer...
6144626 Optical information recording-reproducing apparatus for effecting recording/reproduction of information by use of a plurality of light spots  
In an optical information recording-reproducing apparatus, a spot for recording and a plurality of spots for reproduction irradiate, from an optical head, an information recording medium having a...
6130873 Optical pickup and servo control system for digital data storage  
Methods and apparatus are provided for retrieving encoded information from data tracks on an optical disk using an array of microlasers as the illumination sources, an array of micro-scale photo...
6128259 Optical pickup apparatus for accurate detection of a tracking error signal  
In order to accurately detect a tracking error signal, the position of a sub-beam Bs1 with a lower shading rate is located at a position ahead of the position of a main beam Bm in the recording...
6115349 Two laser source optical pickup with a plano-convex lens to compensate for aberration caused by discs of different thicknesses  
An optical pickup includes a first and second light-emitting elements, a light separating element, and an objective lens. A collimating lens is disposed in the first optical path connecting the...
6097690 Optical pickup and disc player  
A disc player provided with an optical pick-up including plural object lens so that write and read operations of information signals can be carried out with respect to plural kinds of discs in...
6097691 Optical device for recording or reading data to an optical disk  
An optical device wherein when reading of CD is conducted, light from a first optical light source 1 is passed through a first auxiliary lens 2, an optical material 3 and an objective lens 4 to be...
6094411 Confocal microscope with optical recording and reproducing apparatus  
A confocal scanning microscope can process two-dimensional or third-dimensional optical information at high speed and can be simplified in arrangement. The confocal scanning microscope includes an...
6091679 Tracking error signal generating method and apparatus  
A tracking error signal generating method includes: a light irradiating process of irradiating a plurality of tracks, which are on an information record medium and adjacent to each other with an...
6088322 Single objective lens for use with CD or DVD optical disks  
An optical disk reader or read/write system for CD or DVD formats. First and second laser diodes operating at different wavelengths have their output beams collimated and directed at a single...
6084845 Optical head and an optical disk apparatus  
An optical head has a first light source; a second light source; a transmitting and reflecting element having a first surface and a second surface, and used to reflect diverging light from the...
Matches 151 - 200 out of 544 < 1 2 3 4 5 6 7 8 9 10 11 >