DE1270595B - Magnetic read and write device for recording and reproducing television signals - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

H04n

German class: 21 al-32/11

Number: 1270 595

File number: P 12 70 595.2-31

Filing date: April 26, 1962

Opening day: June 20, 1968

The invention relates to a magnetic writing and reading device for recording and reproduction of television signals on a magnetic tape which is wound diagonally around a tape guide drum is, which has a rotating head disk with circumferentially arranged magnetic heads, wherein Magnetic heads and magnetic tape are moved at a predetermined speed.

In the known devices of this type, the erase head is arranged at a point that is to be attached of the rotating read and write head has no relationship. With such a arranged Erase head, the recorded signals are erased over the entire bandwidth at the same time. For this a considerable amount of energy is required.

The object of the invention is to erase the recordings with significantly less energy to be able to perform than is the case with the known erase heads. According to the invention This object is achieved in that at least one writing and Read head, a monitoring head and an erase head are arranged and that each erase head the Width of at least one writing track detected.

Thanks to this arrangement, everything on the magnetic tape can be completely erased Traces the erasure can be carried out with considerably less energy than this is the case with the known devices.

According to a preferred embodiment of the invention, the widths of the read and write head differ, of the monitoring head and the erasing head from each other. This achieves that the erasing and monitoring head can sweep the same track despite the oblique scanning like the recording track of the read and write head.

An embodiment of the invention will now be described with reference to the drawing. It shows

Fig. 1 is a schematic representation of a known magnetic writing and reading device using the invention,

Fig. 2 is a side view of the arrangement according to A b b. 1 with partially cut guide drum,

Figures 3A and 3B are top and side views the revolving head disk,

Fig. 4 shows the representation of the scanning tracks on a magnetic tape when using the invention Magnetic head assembly.

The magnetic tape 10 is guided over a tape guide drum 1. A rotating magnetic head arrangement 3 is located in a slot 2 in a magnetic writing and reading device, for example
for recording and playback
of television signals

Applicant:

Victor Company of Japan, Limited,
Yokohama (Japan)

ίο representative:

Dr. H. Hermelink, patent attorney,
8000 Munich 60, Apolloweg 9

Named as inventor:
Kenjiro Takayanagi,
Suguru Takayanagi, Yokohama (Japan)

Claimed priority:

Japan September 22, 1961 (33 988)

the center of the guide drum. This arrangement consists of a rotating head disk A, on the circumference of which a write head or write and read head 5, a monitoring head 6 and an erasing head 11 are located. The disk 4 is driven by a motor 7. The magnetic tape 10 is looped diagonally over the guide drum 1 by a supply reel 8 and then migrates to the take-up reel 9. So if the magnetic tape runs in the direction of the arrow while the disk 4 is driven at the same time, the magnetic tape in A bb. 4 shown scanning tracks a, a ' and d' by the activity of the read and write head 5. If monitoring is to take place during the recording, the induced voltage is picked up by the monitoring head 6, which is also along the tracks a, d and a " moves and thus reproduces the recordings made immediately.

Since all magnetic heads pass through the same scanning tracks, the earlier Recordings from erase head 11 deleted, new recordings made from write head 5 and monitored by the monitoring head 6.

So that the path of the monitoring head 6 and the erasing head 11 does not differ from that of the write and / or read head 5 differs, the attachment points of the write and / or read head 5, des Monitoring head 6 and the erasing head 11

809 560/341

the rotating disc 4 offset from one another in the axial direction. Instead, the writing and / or read head 5 can be made wider or narrower than playback head 6. Also the erase head 11 can be made wider than the write and / or read head 5.

Claims (2)

Patent claims: 1. Magnetic read and write device for recording and reproducing television signals on a magnetic tape, which is wound diagonally around a tape guide drum which has a rotating head disk with magnetic heads arranged on the circumference, whereby magnetic heads and magnetic tape are moved at a predetermined speed, characterized in that at least one each on the circumference of the head disk (4) Write and read head (5), a monitoring head (6) and an erasing head (11) are arranged and that each erase head detects the width of at least one writing track. 2. Magnetic writing and reading device according to claim 1, characterized in that the Widths of the read and write head, the monitoring head and the erasing head, respectively differ from each other. Considered publications:
German Patent No. 927 999;
British Patent No. 867 831. A priority document was displayed when the registration was announced. 1 sheet of drawings 809 560/341 6.68 © Bundesdruckerei Berlin