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| Number | Title | Issue Date |
| 4716283 | Optical head for focusing a light beam on an optical disk In an optical head for focusing a light beam on an optical disk, a collimated laser beam is focused on the optical disk by an objective lens and is reflected from the optical disk. The reflected laser beam is directed to the prism through the objective le... | 12/29/1987 |
| 4696566 | Three-dimensional driving arrangement A three-dimensional driving arrangement of an objective lens or the like, which is so arranged that coils for focusing control, tracking control and tangential control in three directions are disposed in one magnetic gap for compact size, while the coils ... | 09/29/1987 |
| 4658389 | Track follower system for correcting tangent errors in an optical record scanning system A radially acting track follower system with an optical scanner for an audio or video record disc playback apparatus is provided. The apparatus generates three light spots disposed approximately on a straight line with an adjustable phase grate. The posit... | 04/14/1987 |
| 4628367 | Method and device for reading digital data in an optical mass memory system using electrophotography An electrostatic image of binary data representing elements if formed on a particular electrophotographic member disclosed and claimed in U.S. Pat. No. 4,025,339. The electrostatic image is toned and the toned image is transferred to a storage medium. The... | 12/09/1986 |
| 4536866 | Information retrieval system and apparatus A system and apparatus is disclosed for retrieving analog or digital information stored on an optically sensed disc. In a preferred embodiment, a video disc is disposed between a flooding light source and a matrix array of photosensitive elements, there b... | 08/20/1985 |
| 4530082 | Optical disc write/read employing passive focus maintenance The quality of spot-focus of optical writing and reading light upon the information surface of a flexible optical disc is passively enhanced by (1) rotating the disc with its neutral plane stabilized in space and (2) directing such light through the optic... | 07/16/1985 |
| 4528654 | Dustproof case for an optical information tape including a clamping lens An apparatus for controlling the monoplanar motion of an object, more in particular a tape containing optically readable information, comprising two opposite clamping means on either side of the object. The object as well as at least one of the clamping m... | 07/09/1985 |
| 4525826 | Optical track position detecting apparatus and optical information processor using the same In an optical information processor such as an optical disc apparatus, when a light beam is irradiated to a plurality of tracks on an information recording medium, the plurality of tracks act as a diffraction grating. Areas in which light receiving parts ... | 06/25/1985 |
| 4511212 | Focussing lens operating device An optical focussing device for an optical information storage system. A hollow cylindrical holder carries a lens at its upper end. The holder is connected to a frame by two thin plates adjacent each other near the upper end and by one thin plate at a low... | 04/16/1985 |
| 4490011 | Optical device In an optical device an objective is moved axially along its optical axis relative to a frame in a parallel guide by means of first electro-magnetic actuating means connected to the objective and second electromagnetic actuating means arranged on the fram... | 12/25/1984 |
| 4482986 | Objective lens mount for optical disc player In an optical disc player or other apparatus in which a light beam is directed through an objective lens to be focused thereby at a record medium surface for optically reading information recorded in a track on such surface, the lens is mounted in one end... | 11/13/1984 |
| 4460990 | Apparatus for reading an optical record carrier An apparatus is described for reading an optical information structure arranged in tracks. By the use of a substantially rotationally symmetrical element having an annular radiation-attenuating peripheral portion cross-talk between the tracks as a result ... | 07/17/1984 |
| 4410969 | Optical information playback apparatus An optical information playback apparatus comprises a light detector having a light receiving area divided into four sections by transverse axes and an optical system having a cylindrical lens arranged with its axis taken at about a 45° angle to a direct... | 10/18/1983 |
| 4365323 | Optic read unit for scanning a record carrier having a radiation-reflecting information structure An optical read unit is described for scanning a record carrier with a radiation-reflecting trackwise-arranged information structure. The read unit utilizes a diode laser which generates the read beam and also detects the information stored on the record ... | 12/21/1982 |
| 4293944 | Information play-back apparatus with astigmatic auto-focusing Information play-back apparatus comprising a laser source, a recording medium, a photodetector, a first optical system which conducts a laser beam from the laser source to an information track on the recording medium as a read spot, and a second optical s... | 10/06/1981 |
| 4252412 | Optical focussing device An optical focussing device for focussing a radiation beam emanating from a radiation source onto a record carrier (1), and more specifically for focussing a light beam onto a video disc or audio disc, comprises a frame (3) in which an objective (10) is m... | 02/24/1981 |
| 4193091 | Optical videodisc read unit with tracking and focussing wobblers An optical read unit for reading radiation-reflecting video discs comprises a semiconductor laser which with the aid of a scan wobbler and a focussing wobbler is moved at high frequency in two directions relative to the video disc, a radial direction for ... | 03/11/1980 |
| 4165519 | Optical control system for read out from information recording medium An optical control system for information read out of video and/or audio information optically recorded in a track on the surface of a disc-shaped information medium, wherein a lightbeam is focused into a spot of predetermined transverse dimension at the ... | 08/21/1979 |
| 4136362 | Optical video playback apparatus with tracking control and TBC In apparatus for optically reproducing information signals from a record carrier, such as a video disc, and in which a light beam from a source, such as a laser is incident through an objective lens onto the surface of the record carrier and a tracking se... | 01/23/1979 |
| 4135206 | Objective mount for video disc player An optical scanning device which scans a rotary video disc with the aid of a light beam comprises an objective which performs focussing movements, for focussing a light spot on a recording surface of the video disc, as well as tilting tracking movements a... | 01/16/1979 |
| 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 astigmatic focussing-error detection system. By including... | 10/31/1978 |
| 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 data. The optical reader contains a device for the fast m... | 08/08/1978 |
| 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 underneath a deck and carries a focussing device with an object... | 08/08/1978 |
| 4085296 | Modulated sound reading system A motion picture sound reading system employing a light emitting diode source which is modulated at a carrier frequency several times higher than the highest sound-track frequency for exciting the optical sound track and a carrier-demodulation signal proc... | 04/18/1978 |
| 4074314 | Apparatus for optically reading a record carrier and correcting focus error An apparatus is described for reading a record carrier on which information is stored in an optically readable reflecting structure. By projecting two radiation spots one before and one behind the plane of the information structure, it is possible to asce... | 02/14/1978 |
| 4027952 | Single optical lens with large aperture and large field The invention relates to single lenses with large aperture and large field. The paraxial parameters of a lens with spherical refractive surfaces are selected in advance. The lens aberrations are corrected in such a way by aspherization of the refractive surfac... | 06/07/1977 |
| 4011400 | Apparatus for reading an optically readable reflecting information structure An apparatus is described for reading a radiation-reflecting record carrier on which information is stored in an optically readable track-shaped phase structure. The apparatus inter alia includes a radiation source, an objective system and a radiation-sen... | 03/08/1977 |
| 3969575 | Opto-electronic focus detection system In an opto-electronic focus detection system for determining a deviation between the plane of focussing of an objective and a radiation-reflecting surface the path of a focussing beam which is reflected by said surface includes an assembly of two radiatio... | 07/13/1976 |
| 3969573 | Apparatus for reading a record carrier on which information is stored in an optically readable structure An apparatus is described for reading a record carrier on which information is stored in an optically readable structure. Between a radiation source and an objective system, a polarization-sensitive beam splitter and a λ/4 plate are disposed. The optic a... | 07/13/1976 |
| 3950621 | Apparatus for optically reading a reflecting record carrier An apparatus is described for optically reading an information carrier, which carrier is provided with an optical structure in accordance with the information. Both at the top side and the underside of the carrier shoes are disposed, which together with s... | 04/13/1976 |
| 3939302 | Method and apparatus for recording and/or reproducing a video signal on a photographic record disc Composite television signals are recorded in a spiral track or in a series of concentric circular tracks on a record disc. Line sequential signals are optically recorded in the radial direction on a record disc with one horizontal line interval of the com... | 02/17/1976 |
