DE1028793B - Magnetic head arrangement for multi-track magnetic tapes - Google Patents

Description

GERMAN

The recording process with a magnetic tape takes place basically in such a way that the current Magnetic tape first passes an erase head, then a speaking head, with the erase head already having one deletes the existing recording. This necessary sequence of the function of the erase head and the In the case of multi-track tapes, the speaking head causes a spatial reversal when the direction of tape movement is changed between speech head and erase head, d. H. in particular between the recording gap and the erasing gap. In the known arrangements, this reversal is done either mechanically or electrically. In the latter case, on both sides of the recording gap (seen in the direction of the tape) an extinguishing gap can be provided, each of which is the one that moves during the relative movement between the heads and tape behind the recording head or gap, must be switched off so that the recording that has just been made is not immediately deleted. It is also known to have heads on to arrange a rotatable plate and to rotate it when the direction of travel of the tape changes.

Both the mechanical reversal in the sequence between the speaking and extinguishing gap and the electrical switching means are expensive; the mechanical reversal also makes adjustment difficult the exact position of the head gap to the magnetic tape.

The subject of the invention is a more advantageous solution to the object described. She relates focus on a magnetic head assembly for recording, Playback and deletion of multi-track or multi-track magnetic tapes and is characterized in that apart from the useful gap covering the first of two or more tracks (recording or playback gap) and an additional erasure gap arranged in front of this in the scanning direction in the usual manner Erasing gap is provided, which sweeps the next track or the next tracks. Through this this magnetic head arrangement can be designed and arranged in such a way that when scanning a magnetic tape with several parallel juxtaposed Tracks a shift only transversely to the track direction is necessary, in each case after the course of a track, but not a spatial one Reversal of the sequence of the column, e.g. B. a rotation.

With this new arrangement, when a track of the magnetic tape is recorded, the next following track is erased, provided that there is also an older recording on this which is to be replaced by the new recording. Erasing a subsequent track has the advantage that after erasing and magnetic head arrangement
for multi-track magnetic tapes

Applicant:

Dr. Siegmund Loewe,
Yonkers, New York, NY (V. St. A.)

Representative: Dr. phil. K. Teucke, patent attorney,
Berlin-Dahlem, Iltisstr. 7th

Dr. Siegmund Loewe,

Yonkers, New York, N.Y. (V. St. A.),

and Dipl.-Ing. Werner Zorn, Berlin-Zehlendorf,

have been named as inventors

If necessary, rewriting a track is not necessary, the erase head to the beginning of this track to move it back and then switch it to the adjacent track, which then goes in the same direction how the first track is swept, rather the erasing and recording heads can after scanning one track is moved immediately to the beginning of the next track adjacent to the end of this track that was already erased when the previous track was scanned. This will do a reversal of the recording head / erase head assembly is not necessary after the end of a track has been reached. The second track can thus be located at the same height as the recording head, with the switching off The erasing head can be repainted, whereby it is left to the discretion of the user, the next following, so to have the third track already erased by the erasing head stroking along it or wait until it is level with the recording head when discussing this third track lying and in this case again effective extinguishing head comes into action in front of him.

The principle of the invention and further details of the same are illustrated by the drawing, which is in the

1 and 2 two head gap arrangements shown schematically according to the invention, in the

Figures 3 to 7 show several phases of the scanning of a multi-track tape in connection with the recording process reveals.

809 507/170

1 and 2 show, somewhat enlarged, a plan view of the new magnetic head assembly from the side where the magnetic tape is moved past. The front face 1 of the assembly, that is the place which the tape passes first, leaving a conventionally formed combined recording-reproducing magnetic head Recognize belonging useful gap 2, which is designed as narrow as possible and its Length corresponds to the width of the track to be recorded. Next to this useful gap 2 is an extinguishing gap 3 arranged, in such a way that the relative movement between the head assembly and magnetic tape when sweeping the first track, the useful gap 2 precedes and thus an already existing recording on this first track erases. In the lower part of the front surface 1 facing the tape According to the invention, a second erasing gap, which is denoted by 4, is now provided in the head arrangement. This additional erasure gap 4 is dimensioned and arranged so that he that track when scanning the tape which is next to the track swept by columns 2 and 3.

FIG. 2 basically shows the same track arrangement as FIG. 1, but with the difference that according to FIG Fig. 2, the erase gaps are made longer so that they are seen in the transverse direction of the tape, overlap each other to a short distance.

If necessary, the arrangement according to FIGS. 1 and 2 can be modified to the effect that the additional Erasing gap 4 is made so long that it simultaneously sweeps several of the tracks that the before the columns 2 and 3 swept track are adjacent.

In FIGS. 3 to 7, a strongly shortened magnetic tape AB is drawn, the width of which is shown on an enlarged scale. It is designed so that five parallel tracks can be recorded on it side by side. It is assumed in FIGS. 3 to 7 that an old record is attached to all of these five tracks I to V. It will now be shown how the existing tracks are erased and a new content is recorded by the new head arrangement.

According to FIG. 3, the magnetic head arrangement 1, which is initially located at the upper left end of the tape, as shown in FIG. 1, is moved from the end A to the end JS for the purpose of processing the upper track I. What is meant here is the relative movement, since in reality the head arrangement is fixed and the tape is moved past it.

After reaching the right end of the track at B , the head assembly 1 then has the position shown in FIG. At the same time, the hole gap 4 has erased the entire track II.

A relative movement is now made between the head arrangement and the tape transversely to the tape direction, so that the position shown in FIG. 5 is reached. At the same time, the erasure gap 3 provided only for track I is put out of operation. If there is now a relative movement between head and tape from end B to end A , the useful gap 2 generates a new recording on track II, which had previously been freed from the old recording. At the same time, the erasing gap 4 erases the old recording on track III.

If, according to FIG. 6, the head arrangement 1 has reached the end of the tape A again , the track II is consequently provided with the new recording and the track III is freed from its old recording.

Finally, after the head assembly 1 is once again displaced by one track pitch (see. Fig. 7), repeats the same operation, that is, the A ^T utzspalt 2 is always an erased track is effected before, their deletion in the preceding scanning by the additional erase gap 4 is.

Certain modifications are also possible within the scope of the invention: For example, the additional Erasing gap, if it covers several individual tracks, be divided into as many individual columns, which can be switched off independently of one another, so that the user has it in his hand when Controlling a track to delete one or more of the next adjacent tracks. The decommissioning of the first erasing gap 3 arranged in the same lane as the useful gap after the first tape track is useful automatically - z. B. taking advantage of the transverse displacement of the Head arrangement by a track width - made.

Claims (9)

Claims 1. Magnetic head assembly for recording, playback and erasure in multi-track or multi-track magnetic tapes, characterized in that they except for the useful gap covering the first track and that in the usual manner in the scanning direction in front of this arranged erase gap contains an additional erase gap, which the next track or brushed the next tracks. 2. Arrangement according to claim 1, characterized in that it is only transverse to the lane direction is movable. 3. Arrangement according to claim 1, characterized in that the additional erasing gap in Continuation of the direction of the useful gap is arranged. 4. Arrangement according to claim 1, characterized in that the additional erasing gap in Continuation of the direction of the first erasing gap provided in the same lane as the useful gap is arranged. 5. Arrangement according to claim 1 or the following, characterized in that the extinguishing column in Direction across the track are longer than the useful gap. 6. Arrangement according to claim 5, characterized in that the erasure areas of the Overlap the erase column across the track. 7. Arrangement according to claim 1 or the following, characterized in that the additional extinguishing gap is divided into several individual columns corresponding to several tracks. 8. Arrangement according to claim 1 or the following, characterized in that the provided Extinguishing gaps or their excitation coils can be switched on and off independently of one another. 9. Arrangement according to claim 1 or the following, characterized in that it is provided with means for automatic deactivation of the first erasing gap at the end of the first scanned track is provided or connected. Documents considered: German Patent No. 844 682. 1 sheet of drawings © "09 507/170 4. 5"