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7283440 Tracking error signal detecting method selectively using a push-pull method, an improved push-pull method, and a three beam method and optical recording/reproducing apparatus using the same  
An optical recording/reproducing apparatus includes an optical pickup and a signal processor. The optical pickup includes an optical splitting device which splits light emitted from a first light...
7151724 Disk recording apparatus and disk recording method  
A disk recording apparatus for recording data to a disk includes: a reading and writing element for emitting a read beam onto the disk to read out recorded data therefrom while emitting a plurality...
7088646 Track search control circuit and optical disc drive  
Disclosed is a track-search control circuit for performing track-search of an optical disc stably even at the time of multi-speed reproduction of the optical disc. The track search control circuit...
7035177 Method and apparatus for aberration correction  
In a method and an apparatus for aberration correction according to the invention, aberration occurring in recording/reproducing information derived from causes such as thickness variation of a...
6999657 High density optical data storage  
A data storage apparatus includes an array of optical fibers. The array has a first end and a second end. The first end of the array includes multiple optical fiber ends, each optical fiber end...
6980497 Optical disk recording apparatus and control method thereof  
An optical system of an optical disk recording apparatus irradiates a disk with a main beam for use in writing a data signal onto a disk and a sub-beam succeeding the main beam. When writing a data...
6980495 Optical recording apparatus with interleaving blank rounds into spiral track  
In an optical recording apparatus having an optical pickup, a rotating section is provided for rotating an optical disk which is formed thereon with a guide groove to define a spiral track having a...
6894955 Quick access information read and write devices  
There are provided an information write device and an information read device enabling to generate highly accurate contrast signals. When a main light spot Pc is located at the center of the a...
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...
6882605 FOCUSING METHOD, METHOD OF DETECTING FOCAL POINT DEVIATION, METHOD OF FORMING MASTER OF DATA STORAGE MEDIUM, FOCUSING CONTROL UNIT, UNIT FOR DETECTING FOCAL POINT DEVIATION, AND UNIT FOR FORMING MASTER OF DATA STORAGE MEDIUM  
Focusing control for maintaining a distance between an objective lens and a recording medium constant is executed using light whose wavelength is longer than that of recording light and whose...
6819639 Method and apparatus for multi-channel auto-focus  
A method and apparatus are disclosed for a multi-channel imaging system wherein the beams of light corresponding to each channel can be individually auto-focussed. Individual channel focussing...
6813235 Optical pickup apparatus an optical axis correcting element  
An optical pickup apparatus has a simplified configuration for using a plurality of laser beams at different wavelength to reduce the size, and a laser diode chip for use therewith. An irradiation...
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...
6766414 Methods, apparatus and system for caching data  
The invention relates to caching data in a data processing system including a host computer and a storage subsystem including at least one customer disk and a cache disk. Write transactions are...
6738325 Optical disk unit capable of reducing tracking offset  
An optical disk unit, which performs tracking control by generating a tracking error signal based on detection signals of reflected lights of a main light beam for recording and reproduction and...
6704096 Exposure apparatus and exposure method  
In an exposure apparatus and an exposure method, a disc master to be used in the preparation of an optical disc is applied to an exposure device, making it possible to perform exposure on a disc...
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...
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...
6385147 Recording and simultaneously reading information recorded on a moveable optical recording medium by adjusting the relative position of first and second beam paths  
Apparatus for simultaneously recording and reading information on a medium moveable in forward and reverse directions includes a first record laser and means for establishing a first beam path for...
6207942 Optical pickup device, error detection device, and detection method therefore  
A reflected beam 6 is diffracted by regions 7a and 7b of a hologram 71, these diffracted beams are converged or diverged, and ±1-order diffracted beams from each region are received by...
6151154 Optical pickup, aberration correction unit and astigmatism measurement method  
An optical pickup includes: a light source, an object lens, and an aberration correction unit for correcting aberration by giving a phase difference to a light beam. The aberration correction unit...
6088310 Pickup for an optical system including a blazed hologram for dividing a laser  
A pickup for a recording and reproducing system has a hologram for dividing a laser beam from a laser diode into a main beam and a plurality of sub-beams. The hologram is provided to locate the...
5970034 Multiple-beam optical recording apparatus  
A multiple-optical scanner includes an optical source that produces a plurality of optical beams such that the plurality of optical beams cross each other substantially at a location of a rotary...
5901125 Recording and reproducing optical disk device with multi-disk type capability  
In an optical disk device with various types of optical disks, the amounts of light are set for the various types of optical disks by emitting laser light from a semiconductor laser oscillator...
5822287 Optical recording method, optical recording apparatus and optical recording medium  
The UV laser light outgoing from a UV laser light source 1 is modulated in intensity by a light modulator 2 in accordance with the subsidiary information so as to fall on a mirror 14 via lenses 3,...
5751673 Quick response optical disk system providing accurate displacement of a pick-up and method therefor  
A quick-response optical disk system corrects signals from photodiodes through a differential amplifier to a tracking error signal TE that is further converted to a tracking drive signal TRD and a...
5745449 Optical information recording/reproducing method and apparatus for determining a relative tracking offset amount of light spots on a recording medium to perform tracking control  
An optical information recording and/or reproducing apparatus includes a device for forming first and second light spots on an optical information recording medium to perform recording and/or...
5740138 Apparatus for recording information on a primary optical disk to manufacture optical disks  
A primary optical disk recording apparatus comprises a first light source for recording a signal on a primary optical disk, an objective lens for converging a light beam from the first light source...
5717676 Apparatus for recording on master optical disc  
A master optical disc recording apparatus in need of only little maintenance and allowing easy optical axis adjustment despite its simplified construction. The master optical disc recording...
5701280 Optical information recording and/or reproducing apparatus in which a reproducing light beam is modulated with at least a 100% degree of modulation  
An optical information recording and/or reproducing apparatus includes a first light source for recording or erasing information, a first current source for modulating a light beam from the first...
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...
5684781 Optical pickup for recording/reproducing double-sided disc  
To record/reproduce a double-sided disc, in an optical pickup, a first and a second laser beams spaced each other are irradiated from a first and a second laser sources toward a square...
5648945 Optical information recording/reproducing apparatus  
An optical information recording/reproducing apparatus includes a light source unit for emitting plural light beams for information recording and/or reproduction toward an optical information...
5633845 Optical information recording and reproducing apparatus having reproducing light beams radiated onto regions situated behind and in front of a spot formed by a recording light beam  
An optical information recording/reproducing apparatus using an optical device to radiate a reproducing light beam originating from a second light source onto regions of an optical recording medium...
5598387 High-density optical data storage unit and method for writing and reading information  
This high-density optical data storage unit comprises a storage medium supported on a mechanically stable substrate, and a read/write arrangement employing a plurality of laser light sources and an...
5581469 Apparatus for checking the lifetime of household electronic or electric appliances  
There is provided a device for checking the lifetime of household electronic or electric appliances. This device checks actual energization time and enhances the lifetime by improving the...
5568458 Optical information recording and reproducing apparatus in which reproducing light is used to perform servo control having no offset at recording mode  
An optical information recording and reproducing apparatus comprising a first and a second laser diodes for generating recording light and reproducing light, respectively. A light emission...
5557601 Optical information recording/reproducing method and apparatus in which a first optical spot performs focusing, tracking, erasing and recording and a second optical spot performs two reproducing modes  
An optical information recording and/or reproducing apparatus includes an optical system for letting first and second optical beams pass through substantially the same optical path to form first...
5553038 Magneto-optical record carrier with recording track structure suited for high density recording  
A magneto-optical record carrier having a recording track structure which enables recording with an increased information density. Information areas which are smaller than the write spot supplied...
5535190 Driver system for an updatable optical storage-media  
The invention is a recording system for recording and playing back information stored on an updatable optical storage medium. In the optical storage medium digital data is permanently present in...
5493554 2-laser optical head and recording/reproducing apparatus  
A 2-laser optical head in which the number of optical parts is small and an arrangement is also simple and a whole optical system can be miniaturized. As a construction to realize the 2-laser...
5475665 Optical information writing and reading apparatus having two light sources  
An apparatus for writing and reading information on and from an optical card by projecting a writing light beam and at least two reading light beams onto the optical card includes a first...
5463610 Two-beam optical head for forming first and second light spots on a recording medium  
By using a two-beam optical head, simultaneous focusing of two light spots can be achieved and the execution of simultaneous erasure, recording and reproduction of information can be easily...
5461602 Optical recording and reproducing method and apparatus using light beams of two different wavelenghts  
In an optical recording and reproducing method and an apparatus employed for effecting the method, in a light beam of a wavelength λ1 is converted by a laser unit into a light beam having a...
5450376 Optical information recording/reproduction apparatus with super-resolution optical filter  
An optical information recording/reproducing apparatus realizes a direct verifying operation with a simple structure. A light beam emitted from a light source is converged on a track provided on an...
5442597 Apparatus for writing and reading a magneto-optical record carrier  
An apparatus for writing and reading a magneto-optical record carrier (1) with an increased information density are described. Information areas (4) which are smaller than the write spot (V w )...
5438561 Method for recording and reproducing information using an optical memory  
A method for recording and reproducing information using an optical memory device being constituted by a transparent substrate, a recording film formed on the substrate and made of a resin...
5436871 Optical random access memory having folded image  
A compact optical memory in which data is stored in an optical data layer capable of selectively altering light such as by changeable transmissivity, reflectivity, polarization, and/or phase. The...
5408453 Method of and apparatus for optically writing, reading and erasing a multi-plane record carrier, and record carrier suitable for said method and apparatus  
A method of and an apparatus for writing and reading and/or erasing a multilayer record carrier (1) having a guide plane (2) and a plurality of recording planes (4) are described, using a guide...
5400308 Optical information recording/reproducing device capable of recording information on a moving medium and reproducing information by using reproducing light beams  
According to the optical information recording/reproducing device of the present invention, upon recording of information, when a pit image on an optical detector which is formed by a recording...
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