Abstract: A bearing pin for simple, reliable attachment to a support. A bearing sleeve is pressed over a knurled surface of a pin which is fastened to the support. To prevent movement of the pin with respect to the support, the pin has a support engaging surface forming an edge with the knurled surface. The knurling is continued up to that edge, so that pin material is upset axially beyond the support engaging surface. Upon fastening of the pin to the support, the axially upset material bites into the surface of the support to prevent rotation of the pin. This same knurling, or alternative upset pattern, prevents relative movement between the bearing sleeve and the pin.

Abstract: A device for inscribing and/or reading a magneto-optical disc (7), comprising a frame carrying a turntable which is rotatable about an axis of rotation (11), an optical unit (19) which comprises an objective (21) and an actuator for moving the objective in a direction parallel to such axis of rotation, and, viewed along such axis, a magnetic unit (59) arranged opposite to and spaced from the optical unit. The optical unit and the magnetic unit are movable in a plane which is oriented transversely of said axis of rotation. The magnetic unit comprises a coil (131) arranged on a coil former (129) and a further actuator (24) for moving the coil in a direction parallel to the axis of rotation of the turntable. The device further comprises a measurement and control system for detecting, during operation of the device, the distance between a reference plane (R) of the magnetic unit and the magneto-optical disc and for controlling the position of the coil.

Abstract: A scanning device comprises a rotatable mirror and a drive unit. The drive unit comprises a rotor section which carries the mirror and which is rotatable about an axis of rotation (19), which rotor section has a disc-shaped at least partly permanent-magnetic rotor body (13). The drive unit further comprises a stationary stator section with coils (9) extending in the magnet field of the rotor body to generate electromagnetic driving forces acting on the rotor body to provide the rotary drive of the mirror, and coils (11) disposed in the magnet field of the rotor body to generate electromagnetic bearing forces acting on the rotor body, for electromagnetically supporting the rotatable rotor section relative to the stator section.

Abstract: A loading device comprises a frame (103), a drawer (100) which is movable between a first and the second position, guide means for guiding the drawer, and an electric motor (115) for driving the drawer. The guide means comprise a supporting body (117) which is movable in the frame and which comprises supporting elements (123), guide elements (139) secured to the frame, and at least one stop element (137) secured to the frame. The supporting elements serve for supporting the drawer and the supporting body in such a way that they are movable relative to one another during the movement of the drawer between the first and the second position, and the guide elements serve for moving the drawer relative to the frame in a direction parallel to a supporting surface (101) of the drawer. The stop element serves for guiding the drawer in a direction transverse to said supporting surface.

Abstract: A method of information transmission over a radio channel useful in the field of mobile radio, in which information is sent by the mobile stations broken up into fragments protected by an error detection and correction code. The information is received by one or various fixed receive stations RC.sub.1, . . . , RC.sub.n transmitting the received fragments to a central station CS after having specified them (rank, quality), which central station restores the information signals by performing the logic addition of all received correct fragments, eliminating the fragments that have already been received and requesting a repetition of the fragments that have not been received.

Abstract: The player comprises a frame, a turntable for the information carriers, which turntable is rotatable about an axis of rotation during operation, and a centering device for centering said information carriers relative to a centering axis. The centering device comprises a pair of first pivotal arms, which are each movable about a first pivotal axis parallel to the centering axis, and a first centering element constructed for cooperation with the circumferential edge of the information carriers. The centering device further comprises a pair of second pivotal arms which each comprise a second centering element constructed for cooperation with the circumferential edges of information carriers, the first centering elements and the second centering elements together being disposed at least substantially on a circle concentric with the centering axis in at least one position of the first pivotal arms and the second pivotal arms relative to each other.

Abstract: Adjustment of the static position of the armature of a solenoid or relay-type structure is used to adjust the trip level. An armature stop rod extends through an opening in the structure and is bent over to adjust the length of the stop rod between the frams opening an the active part of the armature. A compact structure is achieved by winding the device coil on a plastic bobbin which provides a bearing for the armature at one end, and an extension through which the adjustment portion of the stop rod extends. This permits ready adjustment after assembly, even when the device spring is arranged around the armature inside the bobbin.

Abstract: Method and apparatus for bit synchronization in a receiver for digital data transmission in which the received short-length packets of bit pulses are first converted into normalized 1 or 0 samples at the rate nFb, where Fb is the bit rate and n a small even integer. For each packet or sub-packet of M bits, the following steps are performed:a) storing the normalized samples according to a sequence matrix [B] having (n+1) row-sequences B1, . . . , BA+1 and M columns;b) determining and storing a transition column matrix [T] having n rows obtained by adding modulo-2 pairs of adjacent sequences B1, . . . , Bn+1;c) calculating two barycentre numbers m1 and m2 for the upper and lower half of the matrix [T];d) calculating a barycentre number m of matrix [T] derived from numbers m1 and m2 and matrix [T] or matrix [T] robated cyclically by half the number of rows (n/2), depending on whether m2-m1 is smaller than n/2 or not.

Abstract: In a coil arrangement which is provided for use in an optical scanner and which has a supportlessly wound first coil (1), to the circumference of which there is attached at least one second coil (4), the axis (7) of the second coil thereby running essentially perpendicular to the circumference of the first coil, it is provided that a plastic jacket (9) is injection-moulded around the circumference of the first coil and that, in the plastic jacket, on the outside in relation to the first coil, at least one coil chamber (10, 11) is formed, which in its cross-section is designed in the form of a channel, at least in certain sections, and in which the second coil is accommodated.

Abstract: A tape transport which is sized to fit within an 8 inch form factor or footprint, to accommodate prevailing mini/micro computer applications, and including operative components which are capable of automatically receiving IBM Corporation's 3480-type tape cartridge and the web of tape which it contains for appropriate introduction to the transport for presentation to a high performance magnetic recording head. This permits a use of the 3480 tape cartridge in a transport apparatus which is capable of fitting within an 8 inch form factor or footprint, and which is therfore acceptable for use in connection with many mini/micro computer applications, yet which is capable of providing high performance (parallel track, high transfer rate) storage and retrieval due to its compatability (and interchangeability) with the format used by the IBM Corporation in connection with its 3480 tape cartridge.

Abstract: A mass loader stores a plurality of cartridges for loading a selected one of the cartridges into an optical disk reader. The loader comprises a magazine carrier and a cartridge loading apparatus. The cartridges are stored in a vertical and parallel orientation within slots in a magazine which is then inserted into the magazine carrier. The magazine carrier depends from a follower nut which travels along a lead screw in a direction transverse to the parallel orientation of the cartridges. As the leadscrew turns, the follower nut travels therealong to move the magazine into the correct position to load the selected one of the cartridges into the reader. After the magazine is properly positioned, another lead screw is driven to propel another follower nut therealong. The follower nut has a loading pin protruding therefrom which engages the selected one of the cartridges for loading. The leadscrew is then driven to propel the cartridge via the pin on the follower nut into the reader.

Abstract: Recording and/or reading of information on an optical record carrier is effected by scanning such record carrier with a radiation beam which is focussed by an objective lens into a scanning spot of a size which is diffraction-limited by the aperture of the objective lens. The effective size of the scanning spot is considerably reduced by including a layer of non-linear optical material in the record carrier, such material having an optical characteristic which changes with changes in intensity of the radiation incident thereon. The read/write resolution of information on the record carrier is thereby substantially increased.

Abstract: A multi-pole filter for use in radio apparatus includes a plurality of isolated ceramic resonators each having an associated varicap diode network to enable electronic tuning respective of ceramic resonators. The inputs of adjacent ceramic resonators are coupled via a first coupling path and also via a second coupling path, the first coupling path being composed of a fixed capacitance network and the second coupling path being composed of a capacitance network including the varicap diode networks associated with the adjacent resonators. The selective values of the various capacitances forming the first and second coupling paths are such that the overall coupling between the resonators remains substantially constant during the electronic tuning of the resonators by the varicap diode network.

Abstract: A transmission system comprising an interrogator (1) and a number of transponders (2). The transponders (2) communicate with the interrogator (1) by means of individual addresses for reading and/or writing of information in the transponders, which admits more than one transponder to be located within the read/write zone of the interrogator. By transmitting the start code from the interrogator and giving the transponders opportunity to answer with an address dependent time delay of the reply code and investigating time differences between transmitted and received reply codes in the interrogator, the address of the transponder is determined. The transmission system is suitable for use in connection with identification, for example, personal identification.

Abstract: Device for holding an optically readable disc in a flat position during playing has concentric annular depressions to which vacuum is supplied by a passage to a rotatably journalled connection having an airtight lead-through.

Abstract: A planar optical head is described, which comprises a detector grating (15) for scanning a surface, for example, a recording layer (2) in an optical record carrier (1). A radiation source (5) supplies a beam (6) which is coupled into a waveguide (9) by an input grating (7) and is formed to a focused scanning beam (11) by an output grating (10). A scanning focus (13) having an optimum shape and a high intensity is obtained by arranging, in the path of the beam reflected by the record carrier, a special detector grating (15) which deflects this beam towards a detection system (17).

Abstract: A data packet switching network is formed by a number of transmitting/receiving stations which are interconnected by radio communication channels through which data packets can be transferred from one station to another according to a routing scheme. Each station is capable of altering its own access rate and of calculating and transmitting first, second and third parameters. The first parameter is indicative of the respective station's output flow (the number of packets successfully transferred per time unit). The second parameter is indicative of the respective station's input flow increase tendency (a measure based on the output flows of the neighboring stations which the station can relay). The third parameter is indicative of the load of the respective station. In each station, the first parameter is calculated and transmitted at regular time intervals to all neighboring stations in reach of the respective station.

Abstract: A public communication system for encrypted audio/video information has various selective entitlement organizations with respect to its distributed receiver station. Such receiver station comprises one or more receiver sub-stations for decrypting the received encrypted information by means of a decrypting key. Furthermore, the receiver station comprises one or more description key sub-stations that may be interrogated by the receiver sub-stations and thereupon may verify a conditional access requirement, and in case of positive verification, forward decryption key information to the interogating receiver sub-station. All said sub-stations are interconnected by a serial standard bus, so that the configuration of a station is flexible and may even be altered dynamically.

Abstract: A block encoded main signal and a balanced block encoded auxiliary signal are combined on a transmission path. The combined signal includes at least one block of encoded main channel signal alternating with one bit of the auxiliary channel signal. The block code for the auxiliary channel is simpler than the block code for the main channel.

Abstract: An optical scanning device for scanning an information plane (2) having tracks is described, which device comprises a radiation source (4) supplying a scanning beam (3) and an objective system (5) for focusing the scanning beam to a scanning spot on the information plane (2). To obtain two tracking spots, two grating parts located at both sides of the scanning beam and capturing border rays from the radiation source are used.