Abstract: Apparatus includes a mounting member having a bore which closely receives the shaft and a counterbore in which two elastic O-rings separated by an annular element are received. A first compression member threadably engages the mounting member to apply axial pressure to the O-rings, which are radially compressed against the shaft by bevelled annular surfaces which capture the O-rings. This provides an environmental seal effective for a vacuum while still permitting axial and rotational movement of the shaft. Apparatus further includes a ball member fixed to the mounting member and received against an O-ring in a socket member. A second compression member threadably engaging the socket member to urge the ball member against the seal to provide additional sealing while permitting pivotal movement of the shaft.

Abstract: Loading device for an apparatus for recording and/or reproducing signals, and apparatus provided with the loading device. The loading device (1) comprises a movable drawer (19) by means of which the record carrier (15) is movable into and out of the housing (3) of the apparatus through an opening in a wall of this housing (3). Guide means (22, 23, 24) are provided for guiding the movement of the drawer (19) relative to the housing (3) and comprise guide elements (23) which are guided in guideways (22), which guide means guide the drawer (19) in guiding directions (26, 27) which enclose an angle with each other.

Abstract: Disc player includes a housing with a frame (11) carrying a scanning device and a disc-drive means for driving discs of different types. Loading mechanism includes a drawer (51) which is movable along guide means between an extended position and a retracted position to move a disc towards and away from the disc-drive means where a movable disc-pressure member (99) presses the disc against the disc-drive means. The disc-drive means comprises a first turntable which is fixedly supported relative to the frame and a second turntable (19) which is movable relative to the frame and can be positioned on the first turntable. A movable holder (21) can be actuated by the loading mechanism to position the second turntable on and remove it from the first turntable.

Abstract: The separating layer between the luminescent layer and the photocathode of the entrance screen in an X-ray image intensifier tube is formed by a layer which has a suitable optical transmission, a suitable chemical inertia, a suitable tightness and a strongly bridging character and which is deposited by means of a plasma CVD technique, so that all requirements to be imposed on a separating layer can be satisfied without causing a substantial loss of efficiency. By variation of the material composition, measured across the thickness of the layer, an optimum optical transition can be realized between the luminescent layer and the photocathode.

Abstract: The transformer comprises a rotor core (1) in the form of a circular ferromagnetic disc which is rotatable about its axis (5), and a stator core (3) in the form of a circular, stationary ferromagnetic disc which is coaxial with the rotor core. The facing main surfaces of these discs are provided with grooves (11, 13) and ridges (15, 17) which are concentric with respect to the axis (5). In the grooves (11, 13) there are provided rotor windings (19) and stator windings (21), respectively. The stator windings (21) consist of conductor tracks on at least one main surface of a circular first portion (25) of a flexible, electrically insulating foil which is connected, via a strip-shaped intermediate portion (27) with connection conductor tracks (41), to a second circular foil portion (29) which supports further conductor tracks (37) and components (39) of an electronic circuit.

Abstract: An eddy-current intermediate rotor (13) is fixed to the motor shaft (9) and is arranged to be rotatable between the stator-iron poles and the permanent-magnetic rotor (15) which is mounted for free rotation on the motor shaft (9). The rotor (15) and the eddy-current intermediate rotor (13) are disc-shaped and form a disc assembly (23) which can be axially magnetized via the stator-iron poles (3) on each side of the disc-assembly (23). A centrifugal coupling is provided, which acts to couple the rotor (15) to the eddy-current rotor when the disc assembly has come up to speed.

Abstract: A first pseudo-halftone picture is converted to a second pseudo-halftone picture of reduced resolution in the ration m:n by dividing the first picture into contiguous picture fields each having i.multidot.n lines and j.multidot.n columns of picture elements in contiguous square subfields each having n.sup.2 picture elements. m.sup.2 elements are selected from each subfield in accordance with a selection sequence which depends on the position of the subfield in the picture field, the elements being selected from all i.multidot.n lines and all j.multidot.n columns of each picture field, the selection sequence being the same for each picture field.

Abstract: Method of providing a substrate of an optically readable information disc with an optically detectable structure, mould for use in the method, apparatus for carrying out the method, and information disc manufactured in accordance with the method.Substrate (3) is provided with a disc hub (8) comprising disc-centering means (9) which serve to center the finished information disc (17) on the drive spindle (27) of a drive apparatus. The intermediate product comprising the substrate (3) and the disc hub (8) is centered on the base (1A) of the mould by cooperation between the base-centering means (17) and the disc-centering means (9). This may be effected by the use of an auxiliary centering means (12) which is in contact with a wall (14) of a central centering hole (11) in the disc hub (8) and with a wall (13) of a central centering recess (10) in the base (1A).

Abstract: A pair of saddle-shaped deflection coils are wound in a jig and are then assembled with other components. During winding the coil an electrically insulating support having electrically conductive connection points for the coil terminators is used, the terminators being connected to the connection points after winding.

Abstract: A method of manufacturing an electromagnetic deflection unit for a cathode ray tube, which unit comprises a field deflection coil consisting of two parts, a line deflection coil consisting of two parts and an annular core of a magnetizable material surrounding the two coils. The two parts of the field deflection coil are wound on the inside of a funnel-shaped field coil support. A hollow, funnel-shaped line deflection coil support having an annular flange at its wide end then passed into the field coil support to such an extent that its narrow end projects form the field coil supported and subsequently the two parts of the line deflection coil are wound on the inside of the line coil support.

Abstract: Clamping device (21) for clamping an optical disc on a turntable comprises a disc-pressure means (23), a support (5) for the disc-pressure means, which support is movable between an operating position and a rest position, and a permanent-magnet system comprising a first axially magnetized annular magnet (31) and a second axially magnetized magnet (29) secured to the support and to the disc-operating means respectively. In the operating position of the support the disc-pressure means is pressed against the disc on the turntable by magnetic force and the disc-pressure means is freely rotatable relative to the support. The permanent magnets are positioned coaxially relative to each other, a radial air gap (33) being formed between the first magnet (31) and the second magnet (29) in the operating position of the support.

Abstract: A polarization-rotator (22) and a polarization-sensitive beam combiner (30') are arranged in the radiation path between a phase-locked diode laser array (10) radiating in a stable supermode and a collimator lens (46). The two radiation lobes (11, 12) are superposed so that a single radiation spot (S) can be obtained. The quality of the spot can be improved by an arrangement of a prism system (40) and a spatial filter (45) in the lateral far field.

Abstract: A method for connecting a magnetic head core (1) with a mounting plate (2) in which the magnetic head core consists of ferrite and is separated from a preformed core block (4). Prior to separation the core block is soldered to a metal block (5) and the magnetic head core is then separated jointly with the mounting plate, from the overall block.

Abstract: Magnetic head (1) has two connected core halves (4, 5) having recesses (2) at a plurality of areas, filled up with glass solder (2'). After securing the magnetic head to the head disc 3 in a predetermined position, the glass solder in the recesses is melted and the melting glass solder connects the magnetic head to the head disc.

Abstract: An electro-magnetic deflection coil with a flangeless narrow end is wound against the inside of a funnel-shaped support 14. The support 14 opposite the windows of the coil parts 19 has recesses 25 through which axially extending guide elements 26, 27 are passed inwards during the winding process in order to support the circumferentially extending turn segments of the coil parts 19 on the rear side. After winding, each coil part 19 is formed to a coherent unit by means of a thermal treatment and the guide elements 26, 27 are removed.

Abstract: A wedge-shaped body (35) having profiled surfaces (37, 39) facing first and second elements is interposed between the first and second elements. The surfaces have first surface portions (37A, 39A) against which the elements abut and second surface portions (37B, 39B) which together with the elements define gaps (61) in which adhesive is applied to join the elements and the second surface portions.

Abstract: Rotatable head support (6) carries at least one magnetic head (7) which scans the tracks of a magnetic tape (1) guided across an arcuate guide surface (5) over an angle smaller than 180.degree.. The angle of inclination (.alpha.) of a head relative to a reference plane (100) is adjustable by a rack (13) and a pinion (15) to enable the tracks (26) to be followed at tape speeds (n.multidot.V.sub.0) which vary relative to a nominal tape speed (V.sub.0). Tape speed detection means (22) derive a control signal used to adjust the angle of inclination (.alpha.) in conformity with a formula containing the playback factor (n) and other parameters in order to enable a comparatively high tape speed (n.multidot.V.sub.0) to be used, starting from a specific maximum acceptable tracking error.

Abstract: The invention relates to an electro-optical device, comprising a frame (1), a movable holder (5) in which an objective (7) having an optical axis (9) is secured, bearing pin (25) fixed to the holder (5) and bearings (27, 29) fixed relative to the frame (1) supporting the holder so that it can be translated and rotated, a magnet (13) secured to the frame and cylindrical wall portions (1B) which wall portions with the magnet form an annular air gap (17) with a radial magnetic field. A focussing coil (19) is secured to the holder and is movable in the air gap, and a plurality of tracking coils (33) are secured to the holder and are situated on the outer side of the focussing coil. The tracking coils extend through recesses (37) between the cylindrical wall portions of the frame, the turns of the tracking coils being situated in or substantially in radial planes containing the axis of rotation (11) of the holder and the turns of each of the tracking coils together forming a continuous free space (35).

Abstract: Elongate magneto-resistive elements (3) spaced apart on a substrate (9) incorporated in a magnetic circuit constituted by a magnetic yoke (5, 7, 9) which is provided with pole faces (19, 21) for the purpose of co-operating with the registration medium, while each magneto-resistive element is provided with two contacts (3A) for connection to a measuring current source. To improve the stability of the magneto-resistive elements, the magnetic head has strip-shaped coupling elements (17) which magnetically couple the magneto-resistive elements and keep them electrically separated from each other.

Abstract: A recording and/or reproducing apparatus (1) includes a holder compartment (10) for a record carrier (2), a cover (13) which can be closed by hand against spring force to close the holder compartment (10), and a latching member (20) for retaining the cover (13) in the closed position, which latching member is movable by hand against spring force to release the cover (13). When the latching member (20) is actuated by hand to release the cover (13), electrical switching means (31) switches off electrical devices (30) of the apparatus (1) and keeps said devices switched off while the cover (13) is open. The switching means (31) includes a single switch (32) whose switching contacts (33, 34) are set to a first switching state when the cover (13) is closed, in which state the electrical devices (30) can be switched on, and which assume a second switching state when the cover (13) is open, in which second switching state the electrical devices (30) are switched off.