DE1449445C

DE1449445C - Circuit arrangement for a magnetic head for recording Binannformatio NEN

Info

Publication number: DE1449445C
Application number: DE19631449445
Authority: DE
Inventors: Lothar Dipl Ing Muller Jürgen Wiese Werner 7750 Konstanz Martin
Original assignee: Telefunken Patentverwertungs GmbH
Current assignee: Telefunken Patentverwertungs GmbH
Priority date: 1963-11-14
Filing date: 1963-11-14
Publication date: 1973-05-24

Description

erhalten soll, ist in der Zeichnung mit S bezeichnet. Seine eine Klemme ist mit der Betriebsspannung — Ub über die Serienschaltung einer Drossel Dr 1 mit einem Widerstand Rl verbunden, andererseits liegt diese Klemme am Kollektor eines Transistors Γ5, dessen Emitter über einen Widerstand Rl mit.OV (Masse) verbunden ist. Die andere Klemme von S ist über eine in Reihe mit einem Widerstand Rl liegende Drossel DrI mit — Ub verbunden, und liegt andererseits amis to receive is denoted by S in the drawing. Its one terminal is connected to the operating voltage - Ub via the series circuit of a choke Dr 1 with a resistor Rl , on the other hand this terminal is connected to the collector of a transistor Γ5, the emitter of which is connected via a resistor Rl . OV (ground) is connected. The other terminal S is connected via an in series with a resistor Rl throttle DrI connected with - Ub, and is located on the other hand,

auf Lesen durch einen gesonderten Lesekopf übergegangen werden soll, müssen beide Transistoren T5 und Γ6 gesperrt werden. Zu diesem Zweck wird an einer Klemme A, die über einen Widerstand RS mit der 5 Basis eines Transistors Tl verbunden ist, ein vorher negatives Potential auf OV umgeschaltet, so daß der Transistor Γ1, dessen Emitter ebenfalls an OV und dessen Kollektor über einen Widerstand R9 an — Ub liegt, gesperrt wird. Hierdurch gelangt negatives Poten-If reading is to be switched over to a separate read head, both transistors T5 and Γ6 must be blocked. For this purpose, a previously negative potential is switched to OV at a terminal A, which is connected to the base of a transistor Tl via a resistor RS , so that the transistor Γ1, whose emitter is also connected to OV and its collector via a resistor R9 on - Ub is blocked. This leads to negative potential

Kollektor eines Transistors Γ6, dessen Emitter eben- io tial auf die an den Kollektor von Tl angeschlosseneCollector of a transistor Γ6, the emitter of which is equal to the one connected to the collector of Tl

Basis eines Transistors Tl, dessen Kollektor über einen Widerstand RIO an — Ub und dessen Emitter über Rl an OV liegt, so daß dieser Transistor Tl leitend wird. Der Kollektor von Tl ist über eine Diode D 3 mit der Basis von Transistor Γ3 und über eine Diode DA mit der Basis von Transistor T4 verbunden, und zwar so, daß das beim Leitendwerden von Tl an dessen Kollektor entstehende positivere Potential, da die Dioden D 3, D 4 in Flußrichtung liegen, die BasenBase of a transistor Tl, the collector of which is connected to Ub via a resistor RIO and the emitter of which is connected to OV via Rl, so that this transistor Tl becomes conductive. The collector of Tl is connected via a diode D 3 to the base of transistor Γ3 and via a diode DA to the base of transistor T4 , in such a way that the more positive potential that arises when Tl becomes conductive at its collector, since the diodes D 3, D 4 lie in the direction of flow, the bases

den Drosseln größer ist. Infolge der größeren Abschart-Spannungspitze dieser Drossel würde ein Ausgleichstrom durch den Magnetkopf S fließen, dessen Richtung zu der des Schreibstromes, der zuletzt durchthe throttles is larger. As a result of the larger cut-off voltage peak of this choke, an equalizing current would flow through the magnetic head S , the direction of which is in the direction of the write current that lasted through

falls über Rl an OV liegt.if over Rl to OV .

Der Transistor Γ5 wird über einen Transistor Γ3 gesteuert, dessen Kollektor an — Ub und dessen Emitter
über die Spannungsteilerwiderstände R3 und i?5 an
OV liegt. Zwischen R3 und R5 ist die Basis des 15
Tiansistors T5 angeschlossen. Ebenso wird der Transistor Γ6 über einen Transistor TA gesteuert, dessen
Kollektor an — Ub und dessen Emitter über die Spannungsteilerwiderstände R4 und R6 an OV liegt, wobei die Basis von T6 zwischen R4 und R6 angeschlos- 20 der Transistoren Γ3 und T4 genügend ins Positive sen ist. Die Basis von Transistor Γ3 wird über die zieht, um diese Transistoren zu sperren. Informationsleitung /1 und die Basis von TransistorΓ4 Hierdurch werden auch beide Transistoren T5 und über die Informationsleitung Il angesteuert, wobei die T6 gesperrt. In diesem Augenblick ist jedoch in den Steuerung so erfolgt, daß immer der eine der beiden beiden Drosseln DrI und Dr 1 noch Energie auf geTransistoren Γ3 und Γ4 gesperrt und der andere lei- 25 baut, wobei, wie erläutert, die Energie in einer der beitend ist. Die Vertauschung dieser Zustände geschieht
z. B. inmer dann, wenn die steuernde Information
ein »L«-Bit enthält, welches durch den Magnetkopf als
Wechsel der Magnetisierungsrichtung auf den magne-The transistor Γ5 is controlled by a transistor Γ3, its collector on - Ub and its emitter
across the voltage divider resistors R 3 and i? 5
OV lies. Between R3 and R5 is the base of the 15th
Tiansistors T5 connected. Likewise, the transistor Γ6 is controlled by a transistor TA , whose
Collector connected to - Ub and its emitter via the voltage dividing resistors R4 and R6 is located at OV, the base of T6 between R4 and R6 CONNECTED 20 of the transistors T4 and Γ3 sen sufficiently positive. The base of transistor Γ3 is pulled over to turn these transistors off. Information line / 1 and the base of transistorΓ4 This also controls both transistors T5 and via the information line II , whereby T6 is blocked. At this moment, however, the control system is such that one of the two chokes DrI and Dr 1 still blocks energy on geTransistors Γ3 and Γ4 and the other is conducting, with the energy in one of the working ones, as explained is. The exchange of these states takes place
z. B. always when the controlling information
contains an "L" bit, which the magnetic head uses as a
Change of direction of magnetization to the magnetic

tisierbaren Träger aufgezeichnet werden soll. Wird 30 S geflossen ist, entgegengesetzt ist, Es würde also einadjustable carrier is to be recorded. If 30 S has flowed, it is opposite, so it would be a

z. B. T3 leitend, so erhält die Basis von TS genügend nicht vorhandener Wert »L« auf den magnetischenz. If, for example, T3 is conductive, the base of TS receives a sufficient non-existent value "L" on the magnetic

negatives Potential, se daß auch T5 leitend wird. Durch Träger aufgezeichnet werden.negative potential, see that T5 is also conductive. Be recorded by carrier.

die gleichzeitige Sperrung von T4 wird das Potential an UrrTden die Aufzeichnung in der gennanten Weisethe simultaneous disabling of T4 will increase the potential at UrrTden the record in the aforementioned manner

der Basis von Γ6 genügend positiv, um diesen Tran- verfälschenden Abschalt-Ausgleichsstrom für denthe basis of Γ6 is positive enough to compensate for this tran- falsifying switch-off compensation current for the

sistor zu sperren. Andererseits wird bei erneuter Um- 35 Magnetkopf S unwirksam zu machen, ist der Kollektorlock sistor. On the other hand, if the magnetic head S is again inoperative, it is the collector

steuerung T6 zugleich mit T4 leitend und TZ zugleich von Transistor Tl über eine Diode Dl mit einem An-control T6 at the same time with T4 conductive and TZ at the same time from transistor Tl via a diode Dl with an

mit Γ3 gesperrt. Die Transistoren TS und Γ6 arbeiten schluß zwischen DrI und Rl und über eine Diode Dl locked with Γ3. The transistors TS and Γ6 work circuit between DrI and Rl and via a diode Dl

also bei der Aufzeichnung im Gegentakt. mit einem Anschluß zwischen DrI und Rl verbunden.so when recording in push-pull. connected to a connection between DrI and Rl .

Ist Γ6 leitend und TS gesperrt, so fließt Strom von Die Dioden Dl und Dl sind so gepolt, daß der Strom,If Γ6 is conductive and TS blocked, current flows from Diodes Dl and Dl are polarized so that the current,

-Ub über DrI, Rl, Magnetkopf S, T6 und Rl nach 40 der durch die erwähnte größere negative Abschalt- OV. Außerdem fließt Strom von -Ub auch über
Dr 1, Rl, T6 und Rl nach OV. Dieser Strom ist, da
er nicht über den Magnetkopf S fließt, stärker (DrI
sowie DrI und Rl sowie Rl sind gleich dimensioniert). -Ub via DrI, Rl, magnetic head S, T6 and Rl after 40 of the larger negative shutdown OV mentioned. In addition, current from -Ub also overflows
Dr 1, Rl, T6 and Rl to OV. This stream is there
it does not flow over the magnetic head S , stronger (DrI
as well as DrI and Rl as well as Rl are dimensioned the same).

Wird nun Γ6 gesperrt und Γ5 leitend, so wird die Strom- 45 über den Widerstand R1 nach OV abfließen kann,If Γ6 is now blocked and Γ5 is conductive, the current 45 can flow through the resistor R1 to OV,

richtung in dem im Querzweig der Brücke liegenden Zur Abschirmung des Magnetkopfes S gegen diedirection in the one in the cross arm of the bridge to shield the magnetic head S against the

Magnetkopf S umgekehrt, indem nun der Strom für unerwünschten Spannungsstöße aus den Drosseln DrIMagnetic head S reversed, by now the current for undesired voltage surges from the chokes DrI

den Magnetkopf über Dr2, Rl, S, TS und Rl fließt. und Dr2 tragen auch die Widerstände Al, Rl bei,the magnetic head flows through Dr2, Rl, S, TS and Rl . and Dr2 also contribute the resistances Al, Rl ,

Der Strom über Dr2 wird bei der Sperrung von Γ6 ge- die zwischen jeweils eine Drossel und die zugeordneteWhen Γ6 is blocked, the current via Dr2 is between one choke and the assigned one

ringer, jedoch ist, weil er vorher stärker war, in der 50 Klemme des Magnetkopfes S eingeschaltet sind. Sieringer, however, because it was stronger before, in the 50 terminal of the magnetic head S are switched on. she

Drossel Dr2 noch Energie gespeichert, die sich in Form sind so dimensioniert, daß etwaige Reststöße, die beimThrottle Dr2 still stored energy, which are dimensioned in such a way that any residual shocks that occur when

eines Extrastromes über Rl, S, T5 und Rl entlädt, so Abschalten des Magnetkopfes S z. B. infolge der Streu-an extra current through Rl, S, T5 and Rl discharges, so switching off the magnetic head S z. B. as a result of the

daß die Einschaltflanke des in dieser Richtung fließen- ung der Charakteristiken bei den eingesetzten Diodenthat the switch-on edge of the flow in this direction of the characteristics of the diodes used

den Stromes versteuert wird. Durch den nunmehr Dl,D2nochauftreten könnten,von dem Magnetkopf S the electricity is taxed. By now D1, D2 could still occur from the magnetic head S

außerdem aufgebauten Stromweg über DrI, Al, TS 55 genügend abgeriegelt sind.In addition, the current path built up via DrI, Al, TS 55 is sufficiently sealed off.

und Rl, dessen Strom stärker ist als der durch den Während des Schreibbetriebes wird, wie erwähnt,and Rl, the current of which is stronger than that caused by the During the write operation, as mentioned,

Magnetkopf S, baut sich in der Drossel DrI Energie an der Klemme A ein negativeres Potential angelegt,Magnetic head S, energy builds up in the throttle DrI at terminal A, a more negative potential is applied,

auf, die in entsprechender Weise den Stromanstieg ver- das den Transistor Tl leitend macht, wodurch deron, which makes the current rise in a corresponding manner that makes the transistor Tl conductive, whereby the

steuert, wenn durch erneute Sperrung von TS und Ent- Transistor Tl durch positiveres Potential an seinercontrols if by again blocking TS and Ent transistor Tl by more positive potential at his

sperrung von T6 der Schreibstrom wieder in die Rieh- 60 Basis gesperrt wird. Das dann an dem Kollektor vonblocking of T6 the write current is blocked again in the Rieh- 60 base. That then on the collector of

tung DrI, Rl, S, T6, Rl umgeschaltet wird. Tl entstehende negative Potential hält die Diodendevice DrI, Rl, S, T6, Rl is switched. The negative potential produced by Tl holds the diodes

Um den Magnetkopf S abzuschalten, wenn z.B. Dl bis D 4 gesperrt.To switch off the magnetic head S when, for example, D1 to D4 are blocked.

Spannungspitze einer der Drosseln DrI bzw. Dr 2 entsteht, über den Weg Dl bzw. D 2, leitender Transistor Tl, welcher den Magnetkopf 5 mit den Widerständen Al, Rl und Transistoren Γ5, Γ6 überbrückt, sowieA voltage peak of one of the chokes DrI or Dr 2 arises via the path Dl or D 2, conductive transistor Tl, which bridges the magnetic head 5 with the resistors Al, Rl and transistors Γ5, Γ6, as well

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 switching current, which arises from the stored energy of a patent claim: inductive element, to make it so effective that it follows one in the same current path

1. Circuit arrangement for a magnetic head using current amplified. For fast current for recording binary information by turning 5 in a load with an inductive character such as changing the direction of magnetization with a z. B. a polarized relay or the field winding DC-fed bridge circuit, in one of which the motor shows the German Auslegeschrift 1138822 shunt arm of the magnetic head and in whose one DC working according to this principle two branches leading a voltage pole fed bridge circuit with one of two lying in the shunt arm Write signals ge ίο load, in which in each of the parallel branches between controlled, push-pull switches, the shunt arm and one voltage pole is located, characterized in that the bridge circuit is a switch and between the two branches between the shunt arm and the other Voltage pole is an inductive element and the other voltage pole is an inductive element and optionally one of the conductive elements (throttle DrI, DrI) is located, the 15th of which can be closed, with the other being opened at each connection assigned to the magnetic head (S) . The current, which flows via the switch closed in one of the parallel to a current discharge path (diodes Dl and DI, lelzweige, then consists of transistor Tl), which is connected to the load by an operating switch (transistor Ti, Tl) during the flowing partial current and a partial current which is blocked via the writing and which flows after the end of the inductive element of the said parallel branch, writing is unlocked by the operating switch, whereby this is charged with energy and with one, at the same time with the unlocking a subsequent opening of said switch and current blocking in both switches (transistor T5, closing of the other, its discharge current in the da- T6) of the bridge circuit is brought about. by reversing the direction of the current via the shunt arm

2. Circuit arrangement according to claim 1, sends 25 and so accelerates the current increase, characterized in that between the magnet- The invention relates to a circuit head (S) and each of the Stromableitweg connections order for a magnetic head for recording a resistance (Λ1, Rl) lies. Binary information by changing the direction of the

3. Circuit arrangement according to claim 1, da- gnetisierung with a DC-fed bridge, characterized in that the operating switch 30 circuit, in the shunt arm of the magnetic head is a transistor (Tl) , which is used to generate and in which to the one voltage pole of blocking potentials for the two switches (each of the two branches one of two through write transistor T5, T6) of the bridge circuit is controlled by signals that are conducting and operating in push-pull mode and is in this state with its terrt.

Emitter-collector path the magnetic head (S) 35. The object of the invention is the formation of a and bridged the switch of the bridge circuit. such a circuit arrangement in such a way that inductive elements in the manner specified above accelerate the commutation in the magnetic head, the

Magnetic head can be switched off (like that

40 mostly when recording data and then very often is required), without further explanation below

Unwanted recording processes occur for the dense recording of binary information, onto a magnetizable storage area by means of a circuit arrangement according to the invention

relative to this moving magnetic head one works characterized in that in the two branches with successive polarity reversals of the head current 45 between the shunt arm and the other voltage meter, which changes the direction of magnetization. There is always an inductive element, whose is z. B. with a "not back to zero" -Ver magnetic head associated connection to one drive the head current then reversed polarity and thus the Stromableitweg is connected, which is through a Direction of magnetization changed when the in operation switch is locked and during writing The information bits entered in the series have the binary value 50 which, after the end of writing by the operating Have "Z." The polarity reversal of the head current can be unlocked in a switch, with the same time as the unfamiliar In the manner of push-pull switches, the current is blocked in both switches the, which is brought about in two parallel branches of a direct current bridge circuit, powered bridge circuit lying, which by the It can expediently continue to be provided

Head flowing diagonal current of the bridge either 55 will be that between the magnetic head and each of the steer in one direction or the other. Such Stromableitweg-connections a resistor lies. Circuit is in the German Auslegeschrift 1 115 493 In a favorable manner it can be provided that

described. The operating switch contains a transistor which is used to operate in push-pull pairs ting switches in the bridge circuit in front of and behind generation of blocking potentials for the two Schaldem the shunt arm containing the magnetic head is controlled to be conductive upstream of the bridge circuit and in see, so that a current parallel to the magnetic head this state with its emitter-collector path Current cannot flow in the bridge circuit and the magnetic head and the switches of the bridge circuit the bridge current is bridged to the full for the magnetic head.

will. On the other hand, however, it is desirable that the one, for example, carry out the inventive

The change in the direction of magnetization as possible is shown in the drawing and well done, d. That is, the flanks of the current direction will be explained below.

changes are steep. The magnetic head, which via its two connection

It is known to disconnect the excitation pulses in alternating directions in order to increase the edge