摘要:
Method and device for reducing the error of the rake angle from the tangential position on a rotating disc during the transmission of information. Essentially at one end of an arm, of which the other end is provided with a converter to transmit the signal, there is provided a guiding unit movable along a path so that it provides continuously for the tangential position of the converter. The method and the device provides for the complete elimination of the error of the angle of rake of the tangential position and are applicable whenever rotating discs carrying information are used, particularly during the manufacturing of turntables and magnetic memories of calculators requiring a small error of the angle of rake.
摘要:
Bei einem Abspielgerät für einen scheibenförmigen Aufzeichnungsträger mit Druckabtastung ist die Güte des abgetasteten Signals von der Auflagekraft des Abtasters (7) auf dem Aufzeichnungsträger (12) abhängig. Erfindungsgemäß wird der Optimalwert der Auflagekraft durch eine Stellgröße (U s ) eingestellt, die aus zwei abgetasteten Signalen konstanter aber unterschiedlicher Frequenz (f 1 und f 2 ) gewonnen ist.
摘要:
Plattenspieler mit einem Abtaster für Schallplatten, deren vertikaler Aufzeichnungsspurwinkel a in verabredeten Grenzen liegen soll, deren absoluter Wert aber unbekannt ist. Der Abtaster besitzt einen Wandler, der Nutzsignale erzeugt und dazu elastisch gelagerte und dadurch bewegliche Abtastteile besitzt. Es sind erfindungsgemäß Mittel zur Bestimmung der Differenz a-ß von Aufzeichnungsspurwinkel a und Abtastspurwinkel β vorgesehen, die eine Spannung erzeugen, die abhängig ist von der Longitudinalbewegung der bei Nutzmodulation bewegten Abtastteile und angezeigt wird und/oder eine Spurwinkelkorrektur ermöglicht. Es werden Ausführungsbeispiele für diese Mittel sowie Blockschaltbilder für die Verstärkung und Anzeige angegeben.
摘要:
Video disc reproducing apparatus comprises a pickup (5) having a stylus (5a) in capacative contact with the surface of a video disc (1). The pressure of the stylus (5a) in the disc (1) is adjusted in proportion to a logarithm of the reproduced signal amplitude by a control circuit (15) including a logarithmic converter (11), a rectifier (12) and a low pass filter (13). In a further embodiment the output from an automatic gain control circuit which is used to maintain the output signal constant is used to control the pressure of the stylus.
摘要:
A lifter mechanism (16) includes: a first lifter (44) that supports an arm (24) from below and is raised and lowered between a first lower limit position and a first upper limit position; a second lifter (48) that supports the first lifter (44) from below and is raised and lowered between a second lower limit position and a second upper limit position; a first biasing member (50) that biases the second lifter (48) from the second lower limit position toward the second upper limit position; a locking lever (54) that is displaced between a locked position in which the locking lever (54) locks the second lifter (48) in the second lower limit position and a released position in which the locking lever (54) releases the lock of the second lifter (48) from the second lower limit position; a second biasing member (56) that biases the locking lever (54) from the locked position toward the released position; a holding member (58) that holds the locking lever (54) in the locked position; and a queueing lever (52) that pushes down the second lifter (48) from the second upper limit position to the second lower limit position.
摘要:
The present invention relates to a tunable record player (1) provided with a special platter (3) and a special arm (B) composed of a flexible bow (7) tensioned by means of a string (9).
摘要:
The invention relates to a pick-up arm system for the reproduction of records, comprising a pick-up arm chassis and a pick-up arm tube. Torsion-element suspension of the pick-up arm is axially stabilized by means of cylindrical permanent magnets which are arranged in a vertical direction and have opposite polarities, said element forming a rotating bearing. According to the invention, the torsion element (10) runs in a congruent manner with respect to the vertical axis of rotation through the horizontal point of rotation of the receiving element (12) for the tube of the pick-up arm. The lower part of the torsion element (10) is connected to a permanent magnet (13) which is connected to the receiving element (12) for the pick-up arm and the upper part of the torsion element (10) is fixed to the upper chassis (15a) of the pick-up arm. A second permanent magnet (14) having an opposite polarity is fixed to the lower chassis (15b) of the pick-up arm in a perpendicular position below said permanent magnet (13).
摘要:
The invention relates to a pick-up arm system for the reproduction of records, comprising a pick-up arm chassis and a pick-up arm tube. Torsion-element suspension of the pick-up arm is axially stabilized by means of cylindrical permanent magnets which are arranged in a vertical direction and have opposite polarities, said element forming a rotating bearing. According to the invention, the torsion element (10) runs in a congruent manner with respect to the vertical axis of rotation through the horizontal point of rotation of the receiving element (12) for the tube of the pick-up arm. The lower part of the torsion element (10) is connected to a permanent magnet (13) which is connected to the receiving element (12) for the pick-up arm and the upper part of the torsion element (10) is fixed to the upper chassis (15a) of the pick-up arm. A second permanent magnet (14) having an opposite polarity is fixed to the lower chassis (15b) of the pick-up arm in a perpendicular position below said permanent magnet (13).