Matches 101 - 150 out of 543 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
6920091 Optical reproduction apparatus and optical recording and reproduction apparatus  
There is provided an optical reproduction apparatus and an optical recording and reproduction apparatus which can improve a CNR and can read at high speed. The center portion of a laser light...
6912234 Optical pickup apparatus and laser diode chip  
An optical pickup apparatus and a laser diode chip which can simplify and miniaturize a construction of the apparatus is provided for using a plurality of laser beams of different wavelengths. The...
6901037 Device for recording and/or reproducing an optical record carrier  
A device for recording and/or reproducing an optical record carrier ( 1 ), comprises an optical system for projecting a first, a second and a third optical beam at a first ( 11 ), a second ( 12 )...
6894959 Method and apparatus for exposing optical disk master  
A method for exposing an optical disk master includes rotating a substrate disk coated with a photoresist, focusing a beam on the photoresist for exposure through an objective lens, and exposing...
6891675 Optical device  
There is disclosed an optical device in which a first light source for outputting a first wavelength light is apart from a second light source for outputting a second wavelength light by a...
6876620 Optical storage device  
An optical storage device capable of at least reproducing information recorded on first and second optical storage media different in distance from a medium surface on which a light beam is...
6829205 Optical pickup, tilt detection apparatus, tilt detection method and optical disk apparatus  
A tilt detection apparatus capable of detecting the tilt of the optical disk, provided with a laser for outputting a laser beam, a diffraction grating for diffracting the laser beam from said laser...
RE38648 Magneto-optical recording/reproducing pickup head with a diffraction grating and a wollaston prism  
A light source for generating light beams, a diffraction grating for splitting the light beam emitted from the light source into at least three light beams, and an objective lens for receiving the...
6813229 Optical disc readout method and apparatus with focusing  
An optical system including an objective lens applies five light beams ( 3 1 to 3 5 ) generated by an optical pickup to a plurality of adjacent tracks on a signal plane of a CD-ROM. Light beams...
6809996 Optical head, optical recording/reproducing apparatus and laser module  
Two light sources radiating two light beams having different wavelengths are simultaneously operated. Reflected beams of these two types of laser beams from an optical recording medium are...
6788628 Optical head and optical data recording/reproducing apparatus using the same  
In an optical head for use in an optical data recording/reproducing apparatus of the present invention, light emitted from a semiconductor laser is split into a main beam that is zeroth order light...
6785203 Optical lens for optical disc drive with aberration suppression for recording/reproducing for a plurality of optical disc types  
An objective lens converges a shorter wavelength laser beam on a DVD having a protective layer, which is 0.6 mm thick, and a longer wavelength laser beam on a CD having a protective layer, which is...
6781930 Diffraction grating, optical pick-up, error signal detection device, and error signal detection method  
An optical pick-up generates a 0-th order diffraction light and ±1st order diffraction lights by a diffraction grating and irradiates the same to an optical disc. The ±1st order diffraction...
6778474 Optical pickup device, optical disc apparatus and method of detecting track discrimination signal  
A track discrimination signal can be generated without requiring the use of a large number of parts or a complex device configuration even when an optical recording medium adapted to the...
6757227 Optical drive apparatus for use with different recording media, tracking control method for use therein, and optical disc  
An optical recording/reproducing apparatus having drive means for rotating a recording medium, an optical head for applying light to the recording medium being rotated by the drive means, thereby...
6754146 Error signal detection apparatus for an optical recording/reproduction system  
An error signal detection apparatus for an optical recording/reproducing system including a light source emitting a light beam and an objective lens focusing the light beam to form a light spot on...
6744712 Optical disc drive with satellite beams for generation of quadrature error signals for radial position detection  
In an optical disc drive, signals from two satellite spots are used to cancel DC offset from a tracking error signal, and for generating a quadrature signal for determining direction of radial...
6738322 Optical data storage system with focus and tracking error correction  
The disclosed device is directed towards an optical data storage system. The optical data storage system comprises an optical medium including a servo plane and at least one data plane. A first...
6738324 Recording and/or reproduction apparatus  
A recording and/or reproduction apparatus, for an information medium including a substrate having concave and convex portions and a plurality of recording layers, includes a light source for...
6735005 Cartesian scanning system  
A Cartesian scanning system for scanning a surface of a sample. The scanning system includes a light source assembly configured to produce at least one collimated beam of light, a light sensing...
6728173 Information reproducing method which reproduces plural components of a focus error signal and a tracking error signal from plural detection regions of plural reflected light beams  
An information reproducing method for reproducing information recorded on a medium by irradiating a laser beam and detecting a reflected light beam from the medium. The method includes detecting a...
6724561 Apparatus and method for compensating for environmental effects on media  
An apparatus and method for compensating for environmental effects on media. The apparatus includes an array of servo readers that are positioned at a non-zero azimuth angle relative to a medium....
6724699 Optical head, lazer diode module and optical recording-reproducing apparatus  
The spot diameter D 3 of a side beam 21 imaged on a disc 5 is set to at least 2.5 times as large as that of a main beam. Via this configuration, an output signal from a detector detecting a...
6721242 Optical detector having three light receiving areas  
An optical detector for detecting at least three optical beams reflected by an optical information recording medium and outputting an electric signal, the optical detector having three light...
6721248 Optical disk unit  
An optical disk unit for recording information on and reproducing information from a disk recording medium by projecting a light beam thereonto includes a signal level detection part detecting a...
6717896 Controlling a gap length in a near-field area in an exposure apparatus  
To control the gap length in the near-field area with a high accuracy, the exposure apparatus includes an exposure light source ( 11 ) to emit an exposure laser light, a gap length controlling...
6717897 Optical pickup apparatus, optical disc apparatus, and track recognition signal detection method  
A primary spot and a secondary spot are formed on an optical disc 101 . The primary spot is used for recording and reproduction. The secondary spot is positioned apart from the primary spot. The...
6658201 Data storage device having multiple heads traveling in opposite directions for capacity and throughput optimization  
Methods and systems for improving the storage capacity and data throughput of a digital mass storage device. The novel optimizations can be applied to a disk drive, either a hard disk drive or a...
6657931 Optical disc drive for performing read/write operations on optical disks  
An optical disc drive compatible with optical discs of different types, for example, is provided. For focusing, through an optical system used in common with the different types of optical discs, a...
6654323 Method of tracking servo for optical pickup device  
A method of tracking servo for an optical pickup device comprises the steps of generating each individual push pull signal (an SPP 1 signal, an SPP 2 signal and an MPP signal) with a photo...
6654336 Semiconductor light source, optical pickup head apparatus, and data record/playback apparatus  
The light source package comprises a first light source for emitting a first light beam, a second light source for emitting a second light beam which is different from the first light beam, and a...
6650612 Optical head and recording reproduction method  
An optical head according to the present invention includes: a first light source for emitting light with a first wavelength; a second light source for emitting light with a second wavelength...
6636471 Optical pick-up  
An optical pick-up emits three laser beams onto an optical disk. The three laser beams are reflected on the optical disk and incident to a condenser lens. The three laser beams are further incident...
6625099 Optical pick-up device  
An optical pick-up device for optically recording and/or reproducing information on an information record medium having plural record layers and guide tracking layers in the depth direction is...
6621771 Disk drive with an objective lens disposed in an optical head moving along a transfer line not intersecting the center of rotation of a disk  
A disk drive includes a DVD optical head and a CD optical head. An objective lens in the CD optical head moves along a reference radial line passing through the center of rotation of an optical...
6621775 Optical head, optical recording and/or reproducing apparatus, and tracking error signal detecting method  
An optical head comprises a first optical system which irradiates a light of a first wavelength towards the information recording medium and detects a return part of the light reflected by the...
6614825 Monolithic VCSEL-based optical pickup and servo control device  
A VCSEL-based monolithic optical pickup system for use with optical recording media with a retaining member, a plurality of VCSELs disposed on the retaining member for emitting laser beams, a...
6614744 Method and apparatus for reading out and writing to an optical disc  
A method and apparatus utilizing a multiple quantum well modulator/emitter/detector pixel in a bilinear array permits reading or writing to an optical disc in parallel such that information may...
6600704 Apparatus for scanning optical recording media having different information carrier layers  
An apparatus for simultaneously reading from or writing to different information carrier layers of an optical recording medium having at least two different information carrier layers, the...
6594221 Optical pickup device  
An optical pickup device includes an illuminating optical system for focusing light beams, split in a main beam and at least one side beam, onto a track on an information storage surface of an...
6577376 Optical device with variable numerical apertures  
The present invention relates to an optical device with a variable numerical aperture (NA), which utilizes special optical properties of a liquid crystal medium. Through the design of external...
6574174 Optical data storage system with multiple layer media  
An optical information storage system using optical storage media including multiple data layers or stacks wherein each of the multiple data stacks has a storage density comparable to a...
6552974 Compatible optical pickup  
An optical pickup compatible between a digital video disc read only memory (DVD-ROM) and a compact disc rewritable (CD-RW), which is a member of the CD family media. The compatible optical pickup...
6552990 Optical head for two different disk thicknesses with a light beam diameter control device  
An optical pickup device which includes a semiconductor laser selectively generating a laser beam with a wavelength of 635 nm, a laser beam with a wavelength of 780 nm, and an optical device having...
6501715 Optical pickup apparatus employing an adjusting circuit  
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...
6496454 Optical information recording/reproducing apparatus  
An optical pickup device comprises a stationary optical system and a movable optical system. The stationary optical system includes a recording/reproducing laser, a collimator for the...
6496465 Monolithic CD/DVD read/write head  
A read head optical system capable of reading either CD or DVD disks is provided. A monolithic molded hollow plastic block includes three lenses integrally molded into its exterior surfaces. A 780...
6493170 Interference device and position detection device using the same  
In an interference device, an elastic member elastically contacts a portion of an object to be detected. An optical probe is so constructed that light emitted from a light source is split into two...
6493297 Multibeam optical disk record and reproduction apparatus and method  
Multibeam optical disk record and reproduction apparatus and method, in which at least two light beams generated are concentrated in different positions of on recording tracks of a recording medium...
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...
Matches 101 - 150 out of 543 < 1 2 3 4 5 6 7 8 9 10 11 >