Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1988-10-19
1991-07-30
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 84, G11B 552
Patent
active
050364189
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE
BACKGROUND
The present invention relates generally to magnetic tape recorders, and more particularly to a recorder with improved cross-talk reduction.
For recording and/or reproducing broad-band signals, especially television signals, on/from magnetic tape, a high relative velocity can be obtained between the magnetic tape and the electromagnetic transformer or transformers, required for transfer, by disposing said transformers on a rapidly rotating head wheel or head drum, as is known from U.S. Pat. No. 3,414,683 and U.S. Pat. No. 3,591,732. In recent devices, the magnetic tape wraps around the head drum or a fixed bipartite drum, in which the head wheel revolves concentrically, in a helical fashion, so that the slowly moving magnetic tape is scanned in tracks running diagonally with respect to the lengthwise direction of the magnetic tape, by the electromagnetic transformer(s) located at the circumference of the head wheel, hereinafter called magnetic heads for short, thereby recording the signals to be stored on the magnetic tape as areas of varying magnetization. During playback, the latter are converted back into electrical signals and processed further.
German Patent Disclosure Document 24 11 402 teaches the transfer of signal and/or drive and/or supply voltages and/or powers without contact, from the fixed part of the magnetic tape recorder to the rotating head drum and back again. For inductive transfer, transformers are used whose coils are arranged pairwise concentrically with respect to one another, and with the primary winding of each being arranged in an annular magnetic core on the fixed part and the secondary winding being mounted likewise in an annular magnetic core on the rotating part, i.e., the head drum or head wheel. Various designs of rotary transformers which act as transfer devices are sufficiently known (German Patent 26 57 813; U.S. Pat. No. 4,364,098; U.S. Pat. No. 4,517,615; German Patent Disclosure Document 30 35 676; German Patent Disclosure Document 36 03 239). One important problem in designing a transformer-type transfer device is its crosstalk behavior. At least one pair of transformer is required for each type of signal and voltage transfer. The transformer pairs are usually mounted close together to save space. An axially and radially staggered arrangement of the rotary transformer pairs to reduce crosstalk as in German Patent 33 19 878 is usually not possible because of insufficient space and a plurality of transformer pairs.
To reduce magnetic scatter, therefore, in the past the transformer pairs were usually shielded from one another by short-circuit rings made of nonmagnetic efficiently electroconductive materials. (German Patent Disclosure Document 30 35 676; U.S. Pat. No. 4,517,615.) The electrical noise fields which radiate from the leads between the magnetic heads and the corresponding transformer windings so far have been reduced only by twisting the lead pair.
THE INVENTION
Hence, the goal of the invention is to provide a magnetic tape recorder, a device for contact-free signal transfer between components moved relative to one another, in which the electromagnetic noise radiation that emerges is largely suppressed.
The magnetic tape recorder according to the invention has the advantage that the transformer leads are protected for their entire length running through the transformer part against crosstalk from other channels. Another advantage is that in the case of passive head wheel wiring, crosstalk protection is effective up to a point close to the rotating magnetic heads.
Advantageous embodiments and improvements of the magnetic tape recorder are possible as a result of the additional features. It is especially advantageous that the alignment of the leads with a plurality of transfer channels is definitely simplified. It is also advantageous that the pulling of the twisted leads into the lead paths provided for the purpose is considerably simplified.
It is also advantageous that the position of the leads does not change under the influ
REFERENCES:
patent: 3414683 (1968-12-01), Dolby
patent: 3591732 (1971-07-01), Prochnow
patent: 4031558 (1977-06-01), Kusaka
patent: 4096535 (1978-06-01), Highnote
patent: 4364098 (1982-12-01), Hirota et al.
patent: 4517615 (1985-03-01), Hino
patent: 4654738 (1987-03-01), Kato
Watabe/Olympus, Magnetic Head Device for Vertical Magnetic Recording, Patent Abstracts of Japan, vol. 10, No. 60, p-435, Mar. 11, 1986.
Dittmann Ludwig
Heinz Richard
Lutzeler Jorn
Willmann Hartmut
BTS Broadcast Television Systems GmbH
Heinz A. J.
LandOfFree
Magnetic tape recorder with shielding device for contact-free si does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic tape recorder with shielding device for contact-free si, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic tape recorder with shielding device for contact-free si will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1546351