Dynamic magnetic information storage or retrieval – Record transport with head moving during transducing – Tape record
Patent
1994-12-28
1996-12-31
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record transport with head moving during transducing
Tape record
G11B 5027
Patent
active
055899994
DESCRIPTION:
BRIEF SUMMARY
This invention relates generally to an apparatus for recording on and playing back a tape which is capable of being recorded on and played back such as a video-tape recorder or tape recorder.
Commercially available apparatuses of this type include a single head carrier mechanism on which are located both the means of recording electrical signals on a magnetic tape and the means of reproduction by playing back signals of this type.
During the recording operation the tape is brought into contact with the head carrier and the signals are applied to the head.
During the reverse operation, i.e. during playback the tape is again brought into contact with the head carrier. The recorded messages are analysed by the head or the heads so as to reconstitute the video or audio signals which have been recorded previously.
The recording and playback functions are independent of each other.
In addition this type of apparatus includes two reels which are frequently grouped together in a cassette and each of which receives the tape over a certain length from one of its ends respectively. The rotational speeds of these two reels are controlled in relation to each other.
This applies both to sound recordings and to recordings of images.
The disadvantage of these apparatuses is that recordings on the tape or the playing back of the tape cannot be carried out simultaneously and independently of each other. Consequently he can reproduce it in full. In other words the user is not able to play back the beginning of this recording during the recording process.
According to the document EDN ELECTRICAL DESIGN NEWS, Vol.8, No.9, August 1963, Newton, Mass., pages 18-21 a recording and playback apparatus for information data is known which includes two sets of recording and reading heads and a reel for each set of heads. There is a storage hopper to receive a certain length of tape and to store it in loose and random folds when one of the sets of heads is used for example to playback with a constant delay what has been recorded or to record and playback at different speeds. The two reels are controlled independently of each other as well as the two sets of heads. Concerning a simultaneous effect playback structure, the playback reel can be known as the reel on which the tape is wound in during a normal playback operation and the recording reel can be known as the reel from which the tape is fed out towards the head carrying out the recording.
According to this document this apparatus is used above all to process information data recorded on tape with a certain delay between the recording and the playback.
This known apparatus is cumbersome as it is necessary for the tape to be run from the recording reel to the recording head and then to the intermediate storage hopper after which it runs to the reading head so as to arrive finally at the playback reel not to mention the guide mechanisms for the tape according the variable paths.
The result of this is that the known apparatus is in the form of a wall cabinet.
U.S. Pat. No. 28.461 describes an apparatus for playing back a cassette in which from each side of the reading head the tape is run in a suction well. A special means is provided to bring a loop of tape from the cassette to the entry of each well. The object of these wells is to regulate the tension of the tape. The two reels rotate whenever the apparatus is used.
In addition apparatuses are known in accordance with U.S. Pat. No. 4,388,659 and WO-A-90/00800 which have substantially the same object as the EDN document but which appear to be not only cumbersome but also highly complex with storage which at least in part is ordered in relation to the tape between the recording head and the reading head.
Patent specification WO-A-90/00800 claims to provide the general public with the means of recording on and playing back a tape with the two processes being independent of each other. This document, however, recommends that the tape be left permanently in the apparatus something which is contrary to the requirements of the general body
de Ferran Max
Hayat Marc
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