Abstract: The remaining vibrations of the main unit of an optical carriage are detected though the tracking signals, and then piezoelectric devices in the said optical carriage are pressed against the braking bars penetrating through it, only for a very short time, at the moment at the centre of the waveforms produced by the tracking signals.

Abstract: An optical card information recording/reproducing apparatus is provided for recording and/or reproducing information to or from an optical card. The apparatus comprises a mounting base on which the optical card is to be mounted and which moves in a predetermined direction, an optical head for irradiating an optical beam onto the optical card to record and/or reproduce information therein or therefrom, and a locking device for locking the mounting base in an unmovable state during transportation of the apparatus. The locking device may be arranged to lock the optical head in an unmovable state as well.

Abstract: A lens actuating system for an optical disk drive has an objective lens movably mounted in a movable frame with orthogonal X-, Y-, and Z-axes. A seeking servo moves the frame in the X-direction. A tracking servo moves the objective lens in the X-direction. A focusing servo moves the objective lens in the Z-direction. An optoelectronic sensor detects the relative position of the objective lens and frame in the X-direction, so that the tracking servo can maintain a fixed relative position during track-seeking, or in the Z-direction, to establish a neutral point on the Z-axis for the focusing servo. Force applied by the focusing servo or tracking servo to move the objective lens in one direction can be opposed by an equal and opposite force applied to a driven mass, so that a net zero force is transmitted to the frame.

Abstract: An electrical cord assembly for lighting fixture includes: a main cord connected to a power source, an illumination adjusting switch box connected with the main cord secured on a supporting stand, at least a lamp cord branched from the main cord through the switch box and connected to at least a lamp secured on the stand through a lamp adapter, wherein the switch box is formed by integrally molding an outer jacket on an inner box for ensuring a water proof property for the power connection, and the inner box having a plurality of fins protruding outwardly from the jacket, and the lamp adapter is also well shielded for water proof purpose, thereby forming an electrical cord system easily assembled for saving assembly labor cost and for providing a lighting fixture for a quicker lighting service, and for effectively dissipating heat in the box for enhancing electrical safety.

Abstract: An objective lens actuator in which an objective lens for focusing a light beam on a recording medium is held in a lens holder, and the objective lens holder is held on a support shaft to be slidable in a direction of the optical axis of the objective lens and pivotal on a plane perpendicular to the optical axis direction includes a balance weight located on the holder to be substantially axially symmetrical with the objective lens. The balance weight includes a balance weight body having a predetermined mass, and a damper for supporting the balance weight body in the lens holder and for damping a vibration of the lens holder in cooperation with the balance weight body.

Abstract: An optical information recording-reproducing apparatus includes an optical head unit, a holding device, a moving device and a guide shaft. The optical head unit effects recording and/or reproduction of information on an optical information recording medium. The holding device holds the optical information recording medium. The holding device includes a guide portion and a magnetic field producing device provided near the lower portion thereof. The moving device moves the holding device relative to the optical head unit. The guide shaft, formed of a magnetic material, guides the holding device for movement in a predetermined direction.

Abstract: A magnetic disk apparatus capable of reducing the vibration thereof is disclosed, in which a linear access mechanism for driving a magnetic head is provided with anti-reaction force generating means for generating an anti-reaction force capable of offsetting a reaction force generated in driving a carriage mounted with the magnetic head.

Abstract: A tangential transducer arm assembly for disk play-back machines, whose pivot for movement in the plane which is parallel to the surface of a disk, is disposed upon a carriage for linear movement upon a track in a plane which exists perpendicular to said disk and which intersects the rotational axis of said disk.One of two embodiments utilizes the frictional drag between said disk and a stylus to pull said carriage along said track, while a mass suspended in a liquid checks that movement to hold said carriage in the correct position for transducer arm tangency.The other embodiment utilizes a stepping motor to drive said carriage along said track. Said stepping motor derives its drive signal from the misalignment of a magnet and a differential Hall effect sensor. Said magnet is part of said transducer arm and said differential Hall effect sensor is fixed to a true tangency indicating reference base, whose pivot is the same as said pivot and whose rotation is determined by a cam surface.

Abstract: A laser disk record player particularly adapted for mobile applications such as in portable players and automobile mounted players. The player is provided with locking means for preventing free movement of the laser carrying scanning assembly when the player is switched off, thereby to prevent excessive wear or accidental damage caused by random acceleration of the normally free arm. With the record player in the load position, the locking means engages the scanning assembly to prevent motion thereof. When a disk is inserted and the player is switched to the play position, means are provided for automatically freeing the locking means thereby to allow the control circuit of the laser player to take over positioning of the arm.

Abstract: The focus actuator, turntable and translation stage in an optical disc record/playback system may effect relatively large reaction forces on the components of the system. These reaction forces can cause vibrations which interfere with or distort information recording or retrieving operations which occur at the same time that high speed access is being effected. A momentum compensating mass is coupled to the focus actuator, turntable and other moving elements to reduce or eliminate the reaction forces which can affect system operation.

Abstract: A device arranged on the rear part of a phonograph tone arm having a mechanism for the adjustment of the vertical tracking force on the stylus of the tone arm and with a dynamic vibration absorber provided with mechanism for the adjustment of the frequency and damping factor of oscillations, wherein the full weight of the counterweight is engaged in the functioning of the vibration absorber.

Abstract: A tone arm comprising a lever with a pickup cartridge on its end and a tracking-force setup assembly, a movable base connected to the lever, and a fixed base, the two bases facing each other. Installed between said bases are a vertical pivot attached to one of the bases and cooperating with a spherical thrust bearing in the other base, and a ball making contact with one of the bases and cooperating with a guiding element in the other base. The guiding element may represent an arched slot, two equidistant arched lugs or a spherical hole.

Abstract: Moving coils of a phonograph pickup are made of a substance having magnetoresistance so that the electrical resistance of the coils are detected by means of bridge circuits. The amounts of resistance variation of the coils are used to produce a vertical component output signal and a horizontal component output signal which respectively indicate the vertical and horizontal displacements of the coils from its optimum operating point with respect to the magnetic field of the pickup. The vertical and horizontal component output signals are used to control vertical and horizontal control motors which correct the attitude of the tone arm so that the moving coils are accurately positioned at the optimum operating point irrespective of the warp and/or eccentricity of the phonograph disk.

Abstract: A video disc player apparatus having a signal pickup stylus secured to a stylus arm for recovering recorded signal from a disc record, wherein the stylus arm is mechanically biased by a spring force to produce a positive stylus-disc pressure, includes apparatus cooperating with the stylus arm to maintain the stylus-disc pressure generally constant in the presence of stylus-disc displacements normal to the disc surface. A permanent magnet is secured to the stylus arm with its interpolar axis transverse to the stylus arm and substantially parallel to the disc record. First and second coils, coaxially aligned are disposed on either side of the magnet and arranged with their axes parallel to the interpolar axis of the magnet. Energizing currents are applied to the first and second coils creating respective magnetic fields which produce forces repulsive to the pole of the permanent magnet proximate thereto.

Abstract: In a video disc player of the type having a signal pickup stylus engaging a disc record for recovering prerecorded information signals, an electromechanical transducer is arranged to cooperate with the signal pickup stylus to regulate the bearing pressure between the stylus and the disc in response to the signal strength of the recovered signal. The arrangement tends to extend the life of the stylus.

Abstract: A cutting stylus assembly for electromechanically recording short wavelength video signal information in a metal master is supported in a cutterhead suspension apparatus. In the suspension head apparatus the cutting stylus assembly is supported by an air puck device so that the stylus cuts an information track having a given quiescent depth. Two sets of parallel spring steel suspension members are used to mount the cutting stylus assembly and air puck to an electromechanical recording lathe. These suspension members are used to control the cutting stylus assembly and air puck motion, to maintain a fixed stylus assembly to air puck plane relationship and to effect a variable preload for the cutting stylus system.

Abstract: A phonographic source has a turntable with a central hub joined by radial arms to a peripheral rim in which the weight of the turntable is concentrated so as to expose at least a major part of the underside of a record supported on the turntable. The record is supported at the hub, and by the arms and/or the rim, and in a modification by one or more concentric rings. The central spindle of the turntable for reception in the record center hole can be connected to the turntable drive shaft only indirectly, by a further construction in which the drive shaft connects with a lower turntable member connected with an upper turntable member for supporting the record by a concentric ring between the members. The source can include a pick-up arm having a counter-balance portion extending from the front position away from the portion carrying the cartridge, which counterbalance portion has at least approximately the shape of the other portion.