Matches 151 - 184 out of 184 < 1 2 3 4
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5594713 Optical pickup head apparatus  
An optical pickup head apparatus comprising: a light source; an imaging optics for receiving a linearly polarized light beam emitted from the light source, and converges it on a small spot on an...
5559787 Polarization of a reflected light beam is changed according to the depth of pits  
An optical disk includes: information recording surface on which information is recorded by irradiating laser light, the information being readable based on the laser light reflected by the...
5513158 Optical disk pickup device with focusing correction by electrostriction  
An optical pickup is adapted for recording and/or reproducing signals by radiating a light beam from a light source on an optical recording medium via an object lens. The optical pickup includes a...
5511050 Focus error detecting method and optical head using the same  
A focus error detecting method and an optical head using it. In the focus error detecting method, a light beam is emitted from a light source, the beam is given positive and negative astigmatism by...
5434841 Plural-beam optical head  
A plural beam optical head is constituted by an optical system for imaging a plurality of light beams onto an optical information recording medium, a double-refractive crystal prism and a sensor....
5416757 Optical disk drive system for use with disks having different protection layer depths  
The objective lens of an optical disk drive has a suitable positioning and numerical aperture so that the light beam will be focused into a spot on the optical media of a first optical disk having...
5339305 Disk-based optical correlator and method  
The correlation speed and storage capacity of an optical disk-based correlator is enhanced by employing a thick (several hundred micron) photo- polymeric film (or other thick holographic media) on...
5315575 Optical information recording apparatus  
An optical information recording apparatus, in which an information recording light bream emitted from a laser diode is divided into a plurality of light beams and the light intensities of the...
5293371 Optical head for a magneto-optical information reproducing apparatus including a light beam splitter having a first glass, a uniaxial crystal and a second glass arranged in sequence  
In an optical head for a magneto-optical information reproducing apparatus, a light beam from a semiconductor laser is focused to a fine spot onto a magneto-optical recording medium. The light beam...
5282188 Apparatus and method for optimizing performance in read/write head of an optical storage system with a magneto-optical storage medium  
In a read/write head for a magneto-optical storage system, a optical wave plate is positioned between the partial polarization beam splitter to which the radiation from the source is applied and...
5233444 Focus error detecting apparatus  
A focus error detecting apparatus in which a light emitting and receiving element including a light emitting portion and light receiving portions all of which are formed in a common semiconductor...
5224193 First order mode frequency doubler system and method  
A first section of a waveguide channel is made of a nonlinear crystal material. A second section of the waveguide has a plurality of diverging channels. Each of the diverging channels is of a width...
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...
5200939 Optical head apparatus including a waveguide layer with concentric or spiral periodic structure  
An optical head arranged in such a manner that light emitted from a semiconductor laser (8) is inputted and coupled in a waveguide layer (3C) by a grating coupler (4C) having a concentric or spiral...
5195070 Optical information processing apparatus and optical pickup therefor  
Using an optical pickup, recording/reproducing of information is performed by irradiating light beams to an optical recording medium to form light spots. The optical pickup includes means for...
5187600 Apparatus for scanning an optical recording medium with a beam of light  
An optical beam scanning apparatus including a semiconductor laser, a first lens which converts a divergent beam to a parallel beam, a liquid crystal display for two-dimensionally modulating the...
5168489 Recorded data reader employing a polarized beam splitter  
A recorded data reader is provided with a light source for emitting a beam of light and with a photosensitive means. A polarized beam splitter incorporates an interface developed between a titanium...
5144602 Magneto-optical information recording method and apparatus in which a laser beam oscillates in a track-width direction  
By performing a recording operation and an erasing operation while oscillating a position of a laser beam irradiation on an optical recording medium in a direction perpendicular to the track...
5138603 System and method for processing optical information with tracking error compensated  
A system and method for processing an optical information on an optical record medium are disclosed in which a timing at which a scanning of a light spot on one record track of the optical record...
5124868 Magneto-optic player with improved C/N ratio  
A magneto-optic player for reading an information signal stored in a magneto-optical record medium in the form of vertical magnetization including a semiconductor laser emitting a linearly...
5062098 Optical pick-up device having holographic element  
An optical pick-up device includes a semiconductor laser for emitting a laser beam, a focusing lens for focusing the laser beam emitted from the laser onto the surface of an optical medium, a...
5058091 Optical pickup device  
An optical pickup device includes a light source for emitting light beam onto a recording medium. A lens is provided in an optical path between the light source and the recording medium. The lens...
5043965 Optical apparatus for optical information recording medium  
An optical apparatus for an optical information recording medium including a light source, two acoustooptical elements for modulating the light beam emitted from the light source and an objective...
5012464 Computer-controlled laser imaging system with automatic beam start at line beginning  
A computer-controlled laser imaging system for switching on a laser imaging beam at the beginning of a line of an image surface has a laser and lens for emitting a laser-light beam, an...
4910723 Tracking servo device for optical storage disk using optical deflector element for adjusting beam spot on the disk  
A tracking servo device for changing a position on an optical storage disk, at which the storage disk is irradiated by a light beam. The servo device is responsive to a tracking error signal...
4896313 Optical information recording medium utilizing pits having a sharp front face and method of manufacturing the same  
An optical information recording medium having a sharp front face of an optical information recording pit to thereby reduce jitter of a reproduced optical signal. The front and back end portions of...
4835751 Reading system for use with optical disc memory system utilizing a smectic chiral liquid crystal  
An improved magneto-optical disc memory with a ferroelectric liquid crystal (FLC) is shown. As FLC a chiral smectic liquid crystal is employed to exhibit a bistability between a pair of substrates...
4760565 High speed track access for optical disks using acousto-optic deflector  
A process for accessing disk tracks in an optical storage disk using a laser beam passed through an acousto-optic deflector which generates an undeflected beam and at least one deflected beam both...
4213158 Optical data recording system utilizing acoustic pulse imaging to minimize image blur  
An optical data recording system in which during recording the image of the acoustic pulse at the writing surface is made to move at the same relative velocity with respect to the recording medium...
4037929 Optical projection device and an optical reader incorporating this device  
This invention relates to a projection device of which the optical device having a focal length is variable under the effect of an electrical signal and comprises a hollow transparent lens into...
3550085 INFORMATION SYSTEM USING ARRAYS OF MULTIPLE SPOT PATTERNS  
3427629 INFORMATION RECORDING  
3408656 Method and appartus for recording composite diffraction grating pattern  
3364497 Recording of digital data  
Matches 151 - 184 out of 184 < 1 2 3 4