Matches 351 - 400 out of 481 < 1 2 3 4 5 6 7 8 9 10 >
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4123652 Apparatus for reading a radiation-reflecting record carrier  
An apparatus is described for reading a record carrier with an optical information structure, in which apparatus errors in the focussing of a read beam on the information plane are detected with an...
4118736 Method of and apparatus for controlling the optical reading of recorded information  
Information which is recorded on a record medium is read therefrom by a main beam of radiant energy, such as a main light beam, which impinges and scans the record medium so as to be modulated with...
4118734 Optical videodisc with variable width tracks  
A disc-shaped record carrier is described on which information is recorded in an optical structure of trackwise arranged areas and intermediate areas. By adapting the average dimensions of the...
4115809 Laser beam system for optically recording information signals on a record disc  
The inventive system optically records information signals on a recording disc. A light source, such as a laser beam, for example, emits a light which is modulated in conformance with an...
4115808 Optical signal play-back device with auto-focussing of a light beam at a record carrier surface  
In a signal play-back device having a substantially flat record carrier or disc provided with first and second oppositely facing reflective surfaces and a signal recorded as variations in at least...
4114180 Closed loop laser noise elimination for optoelectronic recording  
In an optoelectronic audio/video recording system wherein a laser beam which is subject to undesired broad-spectrum noise is intensity modulated by a light modulator with an audio/video...
4110607 System for detecting height fluctuations of a surface on a recording medium in an optical recording or reproducing apparatus  
The invention relates to a system for detecting the height fluctuations of a surface on a recording medium in an optical recording or reproducing apparatus. A light source emits a main light beam...
4106058 Data disc optical reader containing a device for automatic data access  
The invention concerns the reading by optical means of data recorded along a track on a disc; an address code, which increases one unit at each step, is recorded on the disc at the same time as the...
4106057 Dust proof optical system for optically reading and writing on a rotating record with the aid of a radiation beam  
Apparatus for optically reading and/or recording information on a rotary record with the aid of a radiation beam, in particular a video player, in which a carriage which is movable to and fro...
4100577 Apparatus for optically reading signal information recorded on a reflective record medium surface  
An apparatus for optically reading or playing-back video or other signal information recorded as pits or other variations in a record track on a reflective record medium surface employs a polarized...
4100576 Electromagnetic optical beam controller having an eddy current damper for arresting mechanical resonance  
An optical beam controller for use in an image reproducing system, in which information is stored in the spiral track of a disc record and retrieved by scanning the track with a light beam,...
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...
4092671 Video player having plural safety devices actuated by unlatching  
A video disc player comprises a cam body which is mounted on a cover, which cam body has a cam for latching the cover in a closed playing position and for actuating a main motor switch. The cam...
4084185 Record carrier on which information is stored in an optically readable structure  
A record carrier is described which is provided with an optically readable structure of trackwise arranged areas alternating with intermediate areas. Areas of at least two different types are...
4071854 Device for the stabilization of flexible discs and more particularly of videodiscs and reading apparatus adapted to this device  
An apparatus for reproducing information on a flexible video disc in which the disc is accurately positioned facing the transducer head by structure including a fixed plate for prestabilizing the...
4067044 Information recording and retrieval apparatus  
An information signal is recorded on information tracks wobbling along concentric circles or a spiral line on a recording disc in superposed relation with a standard signal whose frequency varies...
4065786 Videodisc playback system  
Recovery from a record of data recorded in an elongated information track, comprising depressed areas of a given width, a given depth, and a variable length, alternating along the length of the...
4060248 Playing apparatus, in particular a video player for playing a record which is made of a transparent material and provided with a central hole  
A playing apparatus, more specifically a video player for playing round records with a central hole, which are made of a transparent material, which records at one side have a transparent surface...
4058834 System for making a light beam scan a flat carrier with autofocusing  
A light beam scanning system having an automatic focus correction, comprises a flat carrier having first and second oppositely facing reflective surfaces at least one of which has variations...
4057831 Video record disc manufactured by a process involving chemical or sputter etching  
A mother for manufacturing long-playing video records is provided by (1) selectively exposing a photoresist disposed as the outer layer on a substrate comprising a disc-shaped plate, a thin layer...
4044378 Optical system for reflective mode video playback apparatus  
An optical system for deriving an output signal from a video disc record that is reflective to a reading beam includes means for directing a reading beam along a predetermined optical path to a...
4041530 Video disc with phase structure  
A carrier is provided with a spiral structure in which sound and/or image information is stored in the form of frequency modulated or phase modulated signals. The carrier structure is composed of...
4037252 Apparatus for reading a disc-shaped record carrier with plural scanning spots for stable radial tracking  
An apparatus for reading a disc-shaped record carrier on which information is stored in a preferably spiral-shaped track. Said information is read optically with the aid of a radiation beam, which...
4037251 Data carrier optically read out by transmission, and method of manufacturing said data carrier  
The present invention relates to the protection of relief impressions formed in order to store information on a data carrier which can be optically read out by transmission. The invention relates...
4034403 Apparatus for positional control of a reading head in a device for reproducing optically coded video disk recordings  
An apparatus is described for reading, by means of a beam of radiation, a disk-shaped information carrier which contains spirally arranged video and/or audio signals coded in optical form, which...
4032971 Video player having safety devices actuated by unlatching  
A video disc player provided with a housing and a latched hinged cover. By unlatching the cover the main motor power is switched off, a brake brings the drive spindle to a standstill, the radiation...
4032927 High density optical recording apparatus  
A high density optical recording apparatus provided with a light sensitive member adapted to make concave and convex records in response to beams. A recording medium is placed on the disc and a...
4030815 Hydrostatic bearing apparatus  
The maintenance of a light spot of a chosen dimension on the surface of a rotating disc for optical playback or optical recording of data is effectively accomplished by a hydrostatic bearing...
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...
4021606 Hologram apparatus  
A hologram apparatus comprises a rotary plane with a plurality of holograms concentrically or spirally arranged thereon, a light emitting source, and at least one photodetector for reading out...
4020278 Data carrier for optical read-out  
The present invention relates to data carriers intended for optical read out. The data carrier in accordance with the invention comprises: a first transparent material at the surface of which the...
4015285 Method of recording television signals on a data carrier and a recording obtained by said method  
The invention relates to the recording of television signals upon an optically readable data carrier. The invention provides a method which consists in recording video information line by line on...
4006292 Information recording and reproducing system with plural information tracks within a single groove  
An information transfer system having a high information transfer rate of the type utilizing a storage medium and associated transducer means, the combination including a movable storage medium...
4005259 Signal reproducing systems employing a semiconductive light source  
A signal reproducing system using light for reproducing video or other information signals recorded on a recording medium, such as a rotatable disc, employs a semiconductor diode laser for...
4003059 Optical recorder having focus controlling means  
An optical device includes a recording medium for recording and reproducing information by light beam, a generator of writing and reproducing light beam, a floating member provided at least one...
4002826 Playback apparatus, in particular, video player, for playing round records provided with information tracks  
A playing apparatus, in particular a video player, for playing round records provided with information tracks and comprising a housing with a substantially flat covering plate, a drive spindle, a...
3999009 Apparatus for playing a transparent optically encoded multilayer information carrying disc  
A disc-shaped information carrier is described which contains spirally arranged image and/or sound signals coded in optical form. By recording the information in at least two spiral information...
3999008 Record carrier on which information is stored in an optically readable structure with dither focussing signals also being stored  
A record carrier is described on which information is stored in an optically readable structure of trackwise arranged areas and intermediate areas. By giving at least one of the surfaces of the...
3985952 Elasto-optic device for spot wobble in a video disc player  
An elasto-optic device for providing periodic lateral displacement in a radial tracking servo system for a video disc player. A transparent prism is vibrated in either a flexural or a second...
3980818 Recorder and reproducer system  
A recorder and reproducer system is disclosed wherein video or other information is recorded by modulated laser lattice ablation of an information storage medium on or a part of a record member. A...
3980810 Device for locally positioning a flexible rotating disc  
The present invention relates to a device designed to constrain the surface of a flexible disc, rotating about an axis, to pass very accurately through a predetermined point. This device is...
3980308 Clamping device for a rotatable information-carrying record  
A clamping device for rotatably driving an information carrying record such as a rigid or flexible video record and comprising a drive spindle, a record support disposed thereon, a substantially...
3969574 Tubular player arm for an optical recording and reproducing device with drive coil and tachogenerator coil on other end  
A device for writing information in a disk-shaped record carrier, and/or for reproducing the recorded information, the transducer being radially movable relative to the record carrier, which...
3962688 Optical mass data memory  
An optical memory for storing large amounts of information with a great packing density having writing and reading cycles controlled by a computer. A laser beam provides writing and reading of...
3956582 Apparatus for reading a record carrier on which information is recorded in at least one track  
An apparatus for reading a record carrier on which information is recorded in at least one track is described. By illuminating the record carrier with a spot of light which is greater than the...
3952146 Electron beam recording of wide-band signals on thermoplastic film  
This invention concerns a method of recording wide-band signals on a thermoplastic film. The signal to be recorded is converted to an intensity modulation of a beam of electrons which is directed...
3947888 Hydrodynamic bearing head providing constant spacing  
A player for video disc includes a vacuum reading head to "read" recorded information from a thin, flexible video disc. A rotating turntable provides a fluid cushion bearing to support the disc and...
3946166 Tracking arrangement  
Correction is provided for errors in radial tracking and timing in a video disc playback system of the optical type. A large ring magnet, and a smaller ring magnet carrying a mirror on one face,...
3944727 Video disc player with movable mirror for directing light beam onto reflective disc  
A video signal play back device derives video signals from a track on a video disc using a light source and an optical path to a lens system which is supported by an air bearing at a predetermined...
3943275 Precision turntable rotation in a vacuum atmosphere  
Fluid from a hydraulic pressure source is utilized to rotate and support a turntable in a vacuum chamber. Signals representative of the rotational velocity of the turntable are utilized to control...
Matches 351 - 400 out of 481 < 1 2 3 4 5 6 7 8 9 10 >