Abstract: A device for rotating inside of a disk player and/or recorder a disk shaped data carrier which takes into account that the rotating disk may be eccentered from an imposed rotation axis. A side moving apparatus allows the rotating disk and a fixing device to which the disk is removably fixed, to move inside the player and/or recorder in a rotation plane substantially perpendicular to an axis of rotation of the fixing device. The rotating disk and the fixing device go into a gyroscopic movement inside the player. A plurality of examples to realize the invention are described.

Abstract: The invention relates to an optical scanning device for apparatuses for recording and/or reproducing information on optical recording media, which is suitable in particular for recording and/or reproducing information at high speed, such as, for example, the scanning of a DVD at a twelve-fold speed. According to the invention, the optical scanning device has a lens holder which is formed by a hollow body and whose side walls are arranged such that they run at an angle to a connecting point with its elastic support. The thus hexagonally formed lens holder has advantageous air chambers and an enlarged distance from the lens, and also an elastic support deviating from a parallel guide, which lead to a low degree of lens tilting, improved guidance properties and a natural resonance behaviour which is necessary for scanning at high speed. The field of application relates to the production of scanning devices for optical recording media which are provided for recording and/or reproducing information at high speed.

Abstract: The present invention relates to a device for reading from or writing to recording media in disc form which has an unbalance compensation means. The object of the invention is to propose a device of this type which has the smallest possible unbalance even when exchangeable recording media are used. This object is achieved according to the invention by virtue of the fact that the unbalance compensation means is a centrifugal force generation means which generates a centrifugal force which is variable during operation. According to another aspect of the present invention, provision is made for the unbalance compensation means to be a positioning means for positioning the recording medium. The field of application of the invention includes, inter alia, devices for reading from and/or writing to optical recording media such as CD, CD-ROM, DVD, DVD-ROM, DVD-RAM and the like.

Abstract: Recording or reproducing unit for a plate-shaped information medium including an improved autobalancer for compensating an unbalance. The autobalancer for compensating an unbalance is arranged in the hold-down for a plate-shaped information medium at a diameter greater than an inside scanning diameter, required for scanning, of the information medium and is formed by at least one disc in a circularly running groove forming the means for compensating an unbalance.

Abstract: A device for rotating inside of a disk player and/or recorder a disk shaped data carrier which takes into account that the rotating disk may be eccentered from an imposed rotation axis. Side moving means allow the rotating disk and the fixing means to which the disk is removably fixed, to move inside said player and/or recorder in a rotation plane substantially perpendicular to an axis of rotation of said fixing means. The rotating disk and the fixing means go into a gyroscopic movement inside the player. A plurality of examples to realize the invention are described.

Abstract: A device for rotating inside of a disk player and/or recorder a disk shaped data carrier which takes into account that the rotating disk may be eccentered from an imposed rotation axis. Side moving means allow the rotating disk and the fixing means to which the disk is removably fixed, to move inside said player and/or recorder in a rotation plane substantially perpendicular to an axis of rotation of said fixing means. The rotating disk and the fixing means go into a gyroscopic movement inside the player. A plurality of examples to realize the invention are described.

Abstract: Recording is carried out with time compression at an increased tape longitudinal speed and an increased head drum speed of rotation. Reproduction is carried out at a set tape longitudinal speed and at the same increased or slightly reduced head drum speed of rotation. Conversion into real time and the frequency position for real time reproduction are ensured by electronic memories into which the signal repeatedly generated by overscanning is written and from which it is read out during reproduction.

Abstract: Head arrangements for appliances for longitudinal multitrack recording and/or replay of signals using a recording medium in the form of tape have stationary multitrack heads which have a large number of individual heads. The head arrangement according to the invention is formed with a first and a second head-mounting device, in which case the first head-mounting device is intended for engagement with the recording medium and has tape guides for the recording medium as well as in each case one recess for the arrangement of a magnetic multitrack head and for the arrangement of the optical scanner of a magneto-optical multitrack head which is arranged in the second head-mounting device.

Abstract: In a tape transport for recording and/or reproducing signals by means of a recording medium using separate winding motors for driving the winding plates, the drive of the winding motors servo units is constructed as open-loop control devices and/or closed-loop control devices. Such servo units can advantageously be used for open-loop control and/or closed-loop control of the drive of the winding motor even during a braking operation.

Abstract: A head drum for a magnetic tape apparatus includes a stationary lower cylinder and a rotating upper cylinder on which at least one write/read head is securely arranged and interacts with a magnetic tape with an exchange of electromagnetic signals. Also provided are at least one amplifier which rotates together with an upper cylinder and amplifies the signals coming from the write/read head, and a rotating transformer for transferring electrical signals between the stationary lower cylinder and the rotating upper cylinder. Storage means for electrical energy arranged on the rotating upper cylinder is capable of supplying electrical power to all the electronic components rotating together with the upper cylinder. A controller is securely arranged on the rotating upper cylinder for monitoring the charge state of the storage means and controlling the duration of the energy transfer as a function of the charge state.

Abstract: An information storage medium has at least a longitudinal bundle comprising three servo tracks (3, 4, 5). The bundle is arranged in consecutive tracking units (T(N)) of a determined longitudinal length. Surfaces of said servo tracks present either a first or a second characteristic (6, 7) and vary in size and distribution inside the tracking units. The bundles may contain longitudinally stored identification information. Methods for obtaining tracking signals indicating a transversal offset between a reading head and the bundle and for retrieving identification information are disclosed. Also methods for obtaining tracking units in which transversal tracking code is combined with distinct information are described.

Abstract: The invention concerns a device which comprises a device for displacing to transversely position a multitrack tape in front of a reading and/or writing head. The magnetic tape carries a plurality of elementary tracks which are grouped in several bundles. These bundles are selectively accessed using the device for displacing. The writing and/or reading head can write and/or read information from elementary tracks contained in one bundle at a time. The device for displacing comprise a tape guide acting on longitudinal edges of the tape and transversely translating the tape. Furthermore they comprise either a movable tape reels platform or movable pins to accommodate for the transverse tape displacement.

Abstract: The invention relates to a device for positioning a first element relatively to a second element. The device according to the invention uses lifting means comprising a cam element and actuator means to actuate the cam element. The cam element has a plurality of contiguously arranged sectors with machined edges belonging to first and second interleaved groups. The machined edges are shaped such that a response of the lifting means to the actuator means has different values for sectors of said first and second group thereby providing alternately a coarse positioning and a fine positioning. The device may for example be used to position a multitrack magnetic tape and a magnetic writing/reading head relatively to each other.

Abstract: A head carrier plate is pressed in the direction of the longitudinal axis of the videotape by spring force against stops. The audio control head bears with its lower edge on a support which simultaneously serves as a tape guide of the lower edge of the videotape and as a pivotal support for the audio control head. Only two setting screws are then necessary, with which the head carrier plate can be set in terms of the angle of inclination with respect to the capstan shaft and in terms of the angle of inclination with respect to the longitudinal axis of the videotape.

Abstract: A tape recorder and/or a playback device for a multitrack tape utilizes a magnetic head having active parts for recording and/or reading microtracks with the active parts being arranged in a two-dimensional matrix within a substantially planar surface of the magnetic head. A pressure device assures contact between the microtracks and the active parts by acting on a backside surface of the tape opposite to the front side surface containing the magnetic head. A structure allows for positioning the magnetic head in front of either one of at least two macrotracks which bundle addressed microtracks. A portion of the tape surface is supported adjacent to the macrotrack bundling the addressed microtracks to prevent unwanted tape deformation.

Abstract: The invention relates to a method for recording longitudinal track bundles on an information medium. The method involves recording tracking information in special tracks in said track bundles. The special tracks are contiguous between each other. When recording a new track bundle a recording and/or reading head may be positioned using tracking information contained in special tracks of a previously recorded track bundle. Several examples of patterns used for coding tracking information in the special tracks we described.

Abstract: Method and apparatus for recording a digital signal wherein the recording rate is higher than the available data rate. In such a situation, the available excess recording capability is used for extending the playing time by the existing storage capacity of a magnetic tape is better utilized. In the present embodiment, playback time is increased by use of a constant tape transport speed with part-segmented helical track recording and a bidirectional recording operation during recording and replay.

Abstract: A drive mechanism for driving independently a first and a second coaxial reel, uses only a single rotatable driving unit for driving both coaxial reels. Independent drive is achieved by reversing the rotation of the driving unit.

Abstract: A process for reducing the friction between a rotating head drum and a tape-shaped recording medium which surrounds the head drum for recording and/or playing back information. In order to shorten access time to information stored on the tape-shaped recording medium, some recorders have the recording medium mounted in a cassette which remains threaded even during rewinding, and surrounds the head drum in the same way as in the play and search modes. Because the tape remains threaded during rewinding, such recorders, also called full-loading recorders, suffer from increased friction between the rotating head drum and the tape moving in the reverse direction. To reduce friction, the speed of rotation of the head drum is increased by a factor, preferably a factor of 2, during rewinding.