Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1990-10-29
1993-03-02
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 7802, G11B 555, G11B 2108
Patent
active
051914956
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a magnetic head guiding device and, more particularly, a device for guiding a magnetic head in the width direction of a magnetic tape which has multi-tracks thereon.
DESCRIPTION OF THE PRIOR ART
Recently, an apparatus for recording and reproducing many pieces of data on and from a magnetic tape, 1/4 inches wide, is under development in the field of data processing.
The most important problem in the course of developing the data recording and reproducing apparatus of this type resides in how these many pieces of data are recorded on and reproduced from the magnetic tape. This problem can be solved when many tracks are formed on the magnetic tape.
As the magnetic tape is made to have more and more tracks thereon, however, the magnetic head must be moved in the width direction of the magnetic tape to more accurately gain access to a predetermined track on the magnetic tape. This asks the magnetic head guiding device which is intended to move the magnetic head in the width direction of the magnetic tape to have high positioning accuracy. When 16 tracks are formed on the 1/4-inch magnetic tape, for example, the moving amount of the magnetic head which moves from one track to another adjacent track on the magnetic tape is about 360 .mu.m. Therefore, the magnetic head is asked to have extremely high positioning accuracy at the micron level.
Conventionally, a device for guiding the magnetic head in the width direction of the magnetic tape to gain access to any of many tracks on the magnetic tape is disclosed by Published Unexamined Japanese Patent Application No. 63-23219. This conventional magnetic head guiding device uses two slide shafts as members for guiding a carriage for the magnetic head in the width direction of the magnetic tape. The carriage is guided along the slide shafts in this case.
In the case of this conventional magnetic head guiding device, however, a slight clearance must be formed between the carriage and the slide shafts to smoothly guide the carriage.
This clearance between the carriage and the slide shafts in the conventional magnetic head guiding device causes the magnetic head to be tilted relative to the magnetic tape. As a result, the magnetic head can often deviate from the desired track on the magnetic tape under this state.
In order to avoid this undesired state, the conventional magnetic head guiding device uses a coil spring to lean the carriage relative to the slide shafts. According to this measure, however, the carriage moves along the slide shafts while rubbing against the slide shafts. This causes those portions of the slide shafts against which the part of the carriage rubs to be gradually worn so as to tilt the magnetic head more and more relative to the slide shafts.
U.S. Pat. No. 4,609,958 and Published Unexamined Japanese Patent Application No. 59-101061 disclose other magnetic head guiding devices in addition to the above-described conventional one. The conventional magnetic head guiding device disclosed in the U.S. Pat. No. 4,609,958 has plural rollers in a hollow portion enclosing a column-like head positioning post (or guide), wherein a column-like carriage is moved in the width direction of the magnetic tape through these rollers.
However, this conventional magnetic head guiding device needs so many structural parts as to make the device complicated and large-sized, which makes it difficult to house these parts in a limited space of the data recording and reproducing apparatus. Further, pins planted in the carriage are inserted into a groove formed on a rotation stopping block so as to prevent the rotation of the carriage in the case of the arrangement disclosed in this U.S. Patent. Those portions of the pins and the groove which rub against one another become gradually worn to thereby float the magnetic head from the magnetic tape.
On the other hand, the conventional magnetic head guiding device disclosed in the Published Unexamined Japanese Patent Application No. 59-101061 has a graphite piston fixed to t
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Anritsu Corporation
Evans Jefferson
Levy Stuart S.
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