Abstract: In a disc-record player with a mechanism for loading a disc (29) onto the turntable there are provided transfer means (5) comprising a frame (8) and a disc holder (6) which can be slid into and out of said frame and which can be lowered therewith axially past the turntable (27) into a lower position in which the disc is supported on the turntable and is clear of the disc holder. The disc holder comprises a plurality of spring-loaded catches (46) which are arranged circumferentially around the disc (29) and which are movable in the radial direction. There is provided a plurality of stationary upwardly directed release elements (55) with conical end portions (55a), which, relative to guide means for the transfer means and a disc-pressure member, occupy positions such that the catches (46) are released when the transfer means are lowered past the turntable (27), whereupon the disc-pressure member (32) urges the disc (29) against the turntable (27).

Abstract: A device for demagnetization of the picture tube of a television receiver and earthing of the conductive coating applied to the cone of the tube includes a demagnetization coil system (4) constituted by a bundle of insulated electric wires held together and forming at least one loop applied to the cone of the tube. The wires of the strand are held together by a tape of plastic material wound helically around them, while a bare electric wire (1) is wound helically with the same pitch as the tape. This wire is connected to earth (15, 16).

Abstract: A sealed shaft for use in an evacuated chamber in which the shaft can be moved by control from outside the chamber while maintaining the seal around the shaft.

Abstract: An electromechanical component, in particular a rotary potentiometer having an integrated center click or optionally more fixed intermediate positions. The fixed intermediate position is obtained by a combination of two teeth and a lug. The two teeth are integrated with the element of the resistance path and the lug with the element having the contact members of the component.

Abstract: A motor-compressor comprising a vibration motor (1) having a rotationally vibrating drive shaft (4) and a compressor (2) having at least one piston (10) which is linearly reciprocated by the motor shaft (4) is suspended in the housing (14) by means of springs (15) so that the points of attachment (17) of the springs are coplanar with and as close as possible to the axis (16) of the rotation, to which the motor- compressor is subjected in operation. This counteracts the imbalance forces to a maximum extent and minimizes the dynamic forces on the housing.

Abstract: Magnetic head (1) for use in vertical recording comprising two protective blocks (5, 7) which jointly constitute a contact surface (S), and a magnetic pole (3) in the form of a thin film of a soft magnetic material enclosed between the two protective blocks. The magnetic head also comprises a winding aperture (13) and a coil W. At least one (7) of the two protective blocks is formed from one piece of ferrite having a high magnetostriction, a first portion (7A) consisting of a ferrite having a high magnetic permeability and a second portion (7B) consisting of a ferrite having only a low magnetic permeability.

Abstract: A stationary guide plate (11) is formed with two locally intersecting profiled grooves (12, 13), which are profiled in conformity with a kinked path having a first and a second path section which are inclined relative to each other and of which a first groove (12) has a smaller width and a greater depth than a second groove (13). The profiled grooves (12, 13) are engaged by guide members (14, 15) which are connected to the object carrier (22) so as to be movable in the profiled grooves, and which have a transverse dimension corresponding at least substantially to the width of the respective profiled grooves.

Abstract: Tray (1) for receiving and retaining a rigid circular information disc (4). Can be inserted into a storage cassette (28) and comprises a recess (3) and retaining means (7, 15, 16) for retaining the information disc (4) in the recess (3). The tray (1), which constitutes an easy-to-remove and easy-to-introduce insert for the storage cassette, is constructed as a drawer-type insert for a playing apparatus. The retaining means (7, 15, 16), which include one resilient retaining means (7), are arranged opposite one another on the edge of the recess (3).

Abstract: Electron multiplier element for secondary emission, consisting of a first metal plate (11) which has at least one multiplier hole (12) having one input aperture (13) and one output aperture (14), and a second metal plate (16) in parallel with the first plate (11) which has at least one auxiliary hole (17) disposed opposite the output aperture (14) of the multiplier hole (12). The second plate (16) being brought to an electric potential (V1) which is higher than the electric potential (V0) of the first plate. The apertures (13, 14) are such that the projection (18) of the output aperture (14) of the multiplier hole (12) in a plane which is parallel to the first metal plate (11) is at least partially located outside the corresponding projection (19) of the input aperture (13).

Abstract: A projection television system comprising an array of three projection television display tubes (14) luminescing in red, green and blue, a focusing lens (16) associated with each tube and a display screen (12) on which the respective optical images are merged to form a single multicolored image. At least one of the display tubes (14) has a multilayer interference filter (46) between the phosphor (30) and the faceplate (20). In order to imprve the light output at the corners of the display screen (12), the cut-off angle of the first filter layers is varied between the center and the corners thereof, for example by increasing the optical thickness of the filter layers relative to the center.

Abstract: Two drive motors (251) drive the shaft of a load via a common drive wheel (19), either directly or via further gear wheels. The rotor shafts of the drive motors are constructed as two-pole single-phase synchronous motors having permanent-magnet rotors. The gear wheels mounted on the rotor shafts are oriented in such a way relative to the direction of magnetic polarization of the rotor magnets that when the arrangement is assembled and in mesh, the magnetic orientation of both rotors (27) relative to the main direction of the stator fields is the same for a positive stator current.

Abstract: An anti-reflection coating which comprises at least a three layer interference filter is evaporated on the external surface of a faceplate panel. The manufacture of the coating can be speeded-up substantially by selecting high and low refractive index materials which can be evaporated at ambient temperatures and subsequently hardened by high temperature annealing outside the evaporation apparatus. The annealing is carried out most conveniently during the standard processing of a cathode ray tube.

Abstract: Device for clamping an optical disc on a turntable (19) includes a turntable which is supported in a chassis (11) and which has a centring member (19B), and a pressure element (15) which is movably supported in a frame (17). The pressure element comprises a holder (37) and a pressure member (39). The holder comprises three resilient limbs (51) which extend in substantially radial directions and which resiliently enclose a central spindle (47) of the pressure member for positioning the pressure member centrally in the holder.

Abstract: The invention relates to a lens mounting (11) for an electrodynamic device for recording and/or reading information in and/or from optically readable discs, which device comprises a frame with supporting means for guiding the lens mounting. The lens mounting comprises a first part (27) which cooperates with said supporting means and a second part (31) which is movable relative to said first part and which comprises the mount (32) for a lens system for focusing a radiation beam. The lens mounting (11) further comprises connecting means (33A, 33B and 35) which movably connect the first and the second part to each other. Respective opposite ends of the connecting means are embedded in the first part and the second part of the lens mounting by injection molding into a molding which is configured so that the relative position of the first and second parts are defined by the corresponding portions of one molding die.

Abstract: Magnetic head for reading information from a magnetic registration medium. Comprises a magnetic yoke (3) having two limbs (3A, 3B) whose free ends constitute pole faces (3A1, 3B1) on either side of a read gap (7). A magnetoresistive element (15A, 15B) provided within the magnetic yoke at a distance from the pole faces is constituted by a layer of Bi provided on the magnetic intermediate yoke (13). Viewed in the longitudinal direction of the read gap, the layer of Bi extends on either side of this gap and at least during operation it is in a constant magnetic field directed transversely to the layer of Bi.

Abstract: The invention relates to an optical assembly comprising a holder (1) and an optical element (3). The holder has an inner wall (9) on which a plurality of parallel ribs (11) are formed. The optical element has an outer wall (7), a plurality of gaps (13) being formed between this outer wall and the ribs. The optical element is connected to the holder by means of an adhesive which is applied exclusively in said gaps.

Abstract: A recording and/or reproducing apparatus (1) for a record carrier (16) in the form of a tape arranged in a cassette (2) provided with a shutter (18) includes a cassette holder (21), which is movable along an L-shaped path from a loading position into an operating position to bring the cassette (2) into an operating position, and a lever (43) for opening the shutter (18) of the cassette (2) when the cassette is brought into its operating position. The cassette holder (21) has an actuating element (49) and the lever (43) has a stop (52) which projects into the L-shaped path of the actuating element (49), so that the lever (43) can be actuated by the cassette holder (21) to open the shutter (18).

Abstract: The positioning device for the magnetic head (14) of a magnetic disc store (1) is constructed so that the heat produced by the stepping motor (6) has no significant influence on the magnetic-head support (2). For this purpose the stepping motor (6) is arranged on a mounting plate (5) made of a material with a low thermal expansion coefficient. This mounting plate (5) is secured to the chasis (3) of the drive mechanism. Between the stepping motor (6) and mounting plate (5) a foil (8) with satisfactory heat-sinking properties is arranged.

Abstract: An electro-optical device is able to follow the information structure (2) of a moving information carrier (3) with a radiation spot 17 in two directions, of which one extends in a plane perpendicular to the other. A lens system (5) is fixed in a lens mounting (9) which relative to a frame (4) may perform pivotal movements about a pivotal axis (10) parallel to the optical axis (6) of the lens system and translational movements along the pivotal axis (10) by means of electromagnetic actuator means (14, 13) which are symmetrically located with respect to the pivotal axis. The lens mounting (9) is of elongate form and its parts which are situated on opposite sides of the pivotal axis (11) have substantially the same mass and mass distribution.

Abstract: Snap action thermostat has a housing molded onto two flat terminals to form a cavity wherein inner portions of the terminals are exposed. A contact arm is welded to the inner portion of one terminal, a dished bistable bimetal element is placed loosely in the cavity, and a fulcrum plate is provided thereover to bias the bimetal element against the contact arm in one of the stable positions to close the circuit. A mounting plate fixed to the housing provides a heat sink to ensure prompt temperature response.