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4598393 |
Three-beam optical servo tracking system with two-track parallel readout
A servo tracking system for an optical record uses a pattern of preformed optically detectable uniform servo track marks disposed in parallel spaced apart columns in combination with a beam from a...
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4578786 |
Track pitch calibration system for use in optical storage devices
A system and method for maintaining a prescribed track pitch in an optical storage system wherein a second radiation beam is aligned a desired distance from a first radiation beam, the first...
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4577301 |
Track pitch calibration error reduction
A system and method for optically measuring and maintaining track pitch in an optical storage system. A set of at least four calibration tracks, each having a prescribed track pitch or distance...
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4571712 |
Beam alignment signal processing
A beam alignment signal processing system wherein a true beam position error signal is generated regardless of beam intensity. This beam position error signal is used within a beam alignment system...
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4571714 |
Read beam position calibration
A system and method for optically measuring and maintaining track pitch in an optical storage system. A set of at least four calibration tracks, each having a prescribed track pitch or distance...
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4569038 |
Optical disk, high density optical disk system, and high density recording/reproducing method using the optical disk
An optical disk recording and reproducing system which uses an optical disk at least one side of which is formed with a spiral groove which has a V-shaped or inverted-trapezoid-shaped cross...
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4564929 |
Information recording and reproducing apparatus with tracking control by sampling
An information recording and reproducing apparatus wherein a light beam is applied onto an optical disk having pits previously formed in optical manner thereon. A tracking signal is detected from...
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4562564 |
Process and optical device for generating signals controlling the position of a scanning spot of the tracks of a data carrier
The process makes it possible to generate on the basis of discrete preetching elements or flags, the radial tracking error and/or focusing error signals. The flags comprise portions displaced with...
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RE32051 |
Tracking system and method for video disc player
A video disc player is described for use with a video disc having frequency modulated video information recorded thereon in the form of a plurality of concentric circles or a single spiral. The...
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4556964 |
Technique for monitoring galvo angle
Disclosed is a radiant energy optoelectronic position monitor system which detects the angular position of a "galvonometer mirror" (beam scanner) used in an optical disk memory arrangement.
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4553228 |
Mobile pre-etched data carrier and an optical tracking device using such a carrier
A mobile pre-etched data carrier is provided in which the pre-etching is formed by a succession of discrete non continuous elements materializing the mean axis of the tracks. The spatial...
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4530079 |
Track following system for optical disc drive
The synchro-servo zones of the data blocks of an optical disc track are provided with information which will permit the generation of clock synchronization pulses and tracking pulses, with those...
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4507763 |
Optical information recording and/or reproducing apparatus and optical record medium for use in such apparatus
A disc-shaped record medium has a recording surface which is divided into a number of concentric recording regions and has a number of concentric guide tracks formed at boundaries between...
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4494226 |
Three beam optical memory system
A three beam laser optical system comprising a writing beam and two reading beams all incident on the same track of a rotating disk optical recording medium. One of the reading beams is incident on...
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4493068 |
Pick-up point dislocation detecting device in recording a disc player
A pick-up point dislocation detecting device for detecting dislocation of a pick-up point of pick-up means in a disc player. The pick-up point is dislocated from a recorded region of a recording...
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4489406 |
Optical memory system having a short seek capability
A high density optical storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of closely spaced concentric tracks. When a short seek...
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4486791 |
Apparatus for optically reproducing signals recorded on a rotating recording medium
An optical apparatus reproduces an information signal recorded as pits along track turns of a rotating recording medium. At least one kind of reference signal is recorded along and overlapping the...
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4464714 |
System for transmitting digital information, coding arrangement for use in that system, decoding arrangement for use in that system and record carrier for use in that system
A system for transmitting digital information including a coding arrangement, a transfer medium, for example a record carrier, and a decoding arrangement. In the coding arrangement the digital...
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4455632 |
Apparatus for optically reading a record carrier with two types of information areas
A record carrier is described which has an optically readable information structure in which information areas of adjacent information track portions have different phase depths, and an apparatus...
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4443870 |
Optical memory system providing track following
A laser optical system including a reading beam for reading optical data recorded in one or more tracks of a rotating disk optical recording medium. The disk includes a plurality of preformatted...
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4435797 |
Optical memory system having track following and seeking capabilities
A high density optical data storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of closely spaced concentric tracks. The system...
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4432082 |
Optical memory system having a long seek capability
A high density optical storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of closely spaced concentric tracks. When a long seek...
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4428075 |
Methods of preformatting an optical disk
A method for preformatting each track of an optical disk with spaced header patterns using a plurality of overlapping, individually modulated writing laser beams arranged in a line perpendicular to...
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4392219 |
Method and device for recording and reproducing tracking information
A method for recording and reproducing information characterized in that an information train in which synchronizing signals are arrayed at equal time intervals between information signals is...
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4374323 |
Focusing apparatus for use in a system for recovering information from an optically-readable storage medium
A system for recovering information from a movable information storage medium by scanning with a beam of radiation, the system including a movable lens for focusing the beam of radiation. The...
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4364118 |
Optical disk and optical information processor
An optical disk for accumulating information in the form in which an information signal can be optically read, wherein to the end of additionally recording information, a line of pits are arrayed...
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4363116 |
Method, apparatus and record carrier body for optically writing information
Disclosed is a method and apparatus for recording information on a disc-shaped record carrier body with a single beam of radiation. The record carrier body is provided with a servo track which...
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4346471 |
Optical apparatus for tracking a record carrier
An apparatus for tracking, by means of radiating beams of light, a record disc (6) which contains video or audio signals recorded in optical form. First and second lasers (1a, 1b) generate a first...
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4331976 |
High density recording system using side-by-side information and servo tracks
An information signal recording system records both an information one and at least one single kind of reference signal for providing a tracking control on a recording medium. The reference signal...
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4295162 |
Reading one-dimensional line image holograms of a video from a disc with a guide track
A holographic video disc system is described in which the baseband information for successive horizontal television line intervals is recorded as successive holograms of one-dimensional line images...
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4290122 |
Self-synchronizing clock source for optical memories
Periodic clock pulses are pre-recorded on each servo track of an optical disk to provide a local self-synchronizing source of clock frequency information for read only or direct read after write...
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4283777 |
Optical memory having a parallel read out
The output beam of a read laser for an optical memory is diffracted to provide a plurality of read beams of substantially equal intensity for simultaneously scanning all of the data tracks of a...
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4189746 |
Method and apparatus for determining focus conditions
Focus accuracy of a radiant energy recording beam is determined by recording test signals along a spiral track to form on the recording medium a series of adjacent bands. Each band comprises a...
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4142209 |
Disc track servo system
Apparatus for optically recording and reading information on a disc medium rotating surface. The information is recorded on concentric or spiral tracks continuously or in parts. The information,...
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4138741 |
Disc eccentricity compensating system
Apparatus for optically recording and reading information on a disc medium rotating surface. The information is recorded on concentric or spiral tracks continuously or in parts. The information,...
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4123147 |
Electrically controlled adjusting device for a light beam with digital and analog deflection control
A light deflector used for tracking a spiral information track alternately and periodically interrupted by data blocks and guide segments arranged within sectors of a rotating record carrier. The...
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4094010 |
Optical multi-channel digital disc storage system
An optical storage system for the simultaneous or random storage of digital information in a plurality of channels, comprising a rotating storage disc which is scanned by a light beam. The digital...
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4094013 |
Optical storage disk system with disk track guide sectors
A storage disk comprising at least one data track which is composed of spiral-shaped turns or concentrical turns, the data being arranged in the form of data blocks on the turns so that between the...
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4022986 |
Playback unit for a long-playing record of a time division multiplexed audio signal
A system comprising a playback unit and an associated long-playing record on which sound information is recorded in a time division multiplex code on several tracks. Upon reproduction the same...
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3919697 |
Data record tracking using track identifying information in the gaps between recorded data groups
A technique for tracking lines of recorded analog or digital data and records which can be played back using such tracking, are described in which tracking information is recorded in the gaps...
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