Deutsche Thomson-brandt Gmbh

U.S. Philips Corporation

Telefunken Fernseh Und Rundfunk Gmbh

Hartmut Schandl

Fritz Weisser

Gunter Gleim

Dietmar Uhde

Peter Hoch

Rudiger Lehmann

Albert M Rijckaert

Hans-Joachim Platte

Robert Einsel

Dietfried Suss

In a system (1) for recording and/or reproducing information signals on/from at least one record carrier (13), which system comprises an apparatus (2) and at least one cassette (3) for use in the apparatus (2), each cassette (3) comprises at least one indicator which by means of one of its parameters indicates at least one characteristic value of an element of the cassette (3), and the apparatus (2) comprises a detection device (97, 101, 78) for the detection of this indicator parameter. At least one electrical impedance (R5, R6) is arranged in a cassette (3) as an indicator of a cassette (3), the impedance value of this impedance defining the parameter for the indication of a characteristic value, and the detection device (97, 101, 78) being adapted to directly or indirectly detect the parameter defined by the impedance value of the at least one impedance (R5, R6).

System for recording and/or reproducing information signals, as well as

In an electronically commutated head drum motor in combination with a motor control circuit, commutation control and tacho signals are generated from the commutation of winding strands. One of the winding strands is used for the phase detection of the read/write heads arranged on the perimeter of the rotating head drum. A commutation signal is derived from the commutation of this winding strand and the commutation signal is set in relation to the reference signal of a signal track to be recorded or scanned.

Phase detector for a recorder/player using a conducting loop driven by a

A cassette loading facility has a guide frame arranged on a chassis in a fixed position. A receiving device is movable between a loading position, in which a cassette can be introduced and removed therefrom, and an operating position. The cassette is positioned on the chassis by means of positioning pins and catch apertures which are formed on the cassette housing. The catch apertures lock the cassette during its transportation between the loading and the operating position and also center it in the operating position. Instead of a fixed arrangement on the drive chassis, the positioning pins are fixed on a first pivoted lever which is pivotally mounted on the cassette receiving device and which can be pivoted into a first position in which the positioning pins release the cassette so that the cassette can be introduced into the cassette receiving device and removed therefrom, and can be pivoted into a second position in which the positioning pins engage with the catch apertures of the cassette whereby the pivoting of the first pivoted lever from the first position into the second position and vice versa is carried out at the loading position of the cassette receiving device. The cassette is locked in the cassette receiving device during its loading or unloading process by the positioning pins engaging with its catch apertures. Upon reaching the operating position, the lower ends of the positioning pins each engage with correspondingly arranged centering apertures in the chassis.

Cassette loading device having decreased loading effort

A braking device for a tape player/recorder includes a pair of reel platters and a pair of pivotable brake arms individually supporting brake pads. A tension member biases the brake pads against the reel platters in a brake-applied position. The brake arms have extensions extending to a selected point. A spring biased pivotable lever arm includes a tracking end and an actuating end. The actuating end engages the brake arms at the selected point to bias the brake pads away from the reel platters against the action of the tension member in a brake-released position. A lifting element is coaxial with a motor driven shaft and includes a helical ramp extending around the lifting element and rising from a lower level to a higher level. An adjusting element is coaxial with the shaft and is outside of the lifting element. The adjusting element includes lower and higher faces respectively coincident with the lower and higher levels of the ramp. The adjusting element also biases the pivotable lever from the lower face to the helical ramp to enable the tracking end of the lever to rise from the lower level to the upper level and place the braking device into the brake-released position. A clutch disengages the adjusting element from the shaft in the brake-released position.

Braking device for magnetic tape recorder

A drum for a rotatable cylinder head includes an opaque disc-shaped member having a plurality of opaque fins affixed thereto and arranged substantially normal to the disc-shaped member. A first plurality of the fins has a first width and a second plurality of the fins has a second width broader than the first width. Every fin has a distal end remote from the disc-shaped member, and an opaque circumferential ring is affixed to the distal end of each fin. The disc-shaped member, the fins and the circumferential ring form a plurality of apertures about the drum.

Head cylinder for a recorder

A system for heating a tape drive includes a heating element which is actuated by the same voltage that drives the motor. An electronic switch is responsive to the motor voltage and turns the heating element on when the motor is not running and off when the motor is running.

Magnetic tape device with a head cylinder

A tape player/recorder device for a tape cassette includes a winding reel driven by a capstan motor through a tumbler gear. The shaft of the motor is outside of the cassette. The tape player/recorder device also includes a plurality of threading elements, an idler roller, a plurality of threading elements and a threading motor for threading the tape into the player/recorder. A planet gear is responsive to the capstan motor and is in engagement with the tumbler gear. A slip coupling enables the selective by-passing of the planet gear.

Tape drive and winding mechanism for tape player/recorder

A system for adjusting the tension of a tape in a magnetic tape record/playback device includes a feed spool, a take-up spool and a motor for feeding the tape between the spools in a forward direction and a reverse direction. A tension sensor senses the tension in the tape as the tape is fed in the forward direction. The tension sensor is locked in its last existing position when the tape direction is changed from the forward direction to the reverse direction. A slip coupling applies a pre-adjusted tension to the tape when the tape is fed in the reverse direction.

System for adjusting tension in a tape

A support for supporting an integrated head in a tape record/play device has two degrees of freedom for adjusting the head in orthoginal directions and includes stops for adjustably holding the head above a base plate. The support includes a carrier plate having a substantially flat leaf spring portion and a lateral end integral therewith for mounting the carrier plate in the support. The leaf spring portion provides a degree of freedom in one of the two directions. A substantially U-shaped spring has a fixed leg coplanar with and substantially normal to the leaf spring portion and a free leg for providing a degree of freedom in a second of the two directions. The integrated head is attached to the free leg whereby the head is independently adjustable in the orthogonal directions by flexing the leaf spring and the substantially U-shaped spring.

Mounting arrangement for a magnetic head in a tape recorder

In a video recorder, a guidance arrangement for guiding a running-in segment of a magnetic tape located at an entrance to a head drum includes a tape tension sensing pin. The pin is mounted on a tape tension lever. A flange mounted on the pin by means of a pressure spring is slidable relative to the lever. The flange causes the tape to be fed to a guide roller in a running-in angle that is the same for tapes of different degrees of rigidness.

Resilent tension sensor pin for magnetic tape guidance

A brushless DC motor system includes a multi-pole DC motor having coils and permanent magnets. Optically scannable markers are applied on the circumference of a rotating member of the motor in fixed association with the magnets. By means of a scanner, these markers are converted to signals. These signals are evaluated with respect to their phase position and moment of commutation, and as a result commutation current is supplied to the coils.

Brushless DC motor system with optically scannable member for commutation

A magnetic tape apparatus for recording of data, including two spaced apart tape guides for guiding a movable magnetic tape therebetween, the portion of the tape between the tape guides being in tension, magnetic heads between the guides for scanning the tape, and a main tape drive which selectively moves the tape continuously in a path which includes a segment extending between the guides past the magnetic heads, the tape guides and magnetic heads being shiftable relative to each other independently of the main tape drive for longitudinally shifting the portion of the tape between the tape guides relative to the magnetic heads.

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Vienna, Austria

Hartmut Schandl