Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1988-11-08
1991-08-27
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 7703, G11B 556, G11B 5596
Patent
active
050438352
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL APPLICATION FIELD
The present invention relates to a magnetic recording/reproducing apparatus using a disc-like flexible magnetic recording medium (which will be referred hereinafter to as floppy disc).
BACKGROUND OF THE INVENTION
Now, known is a means for performing the magnetic recording/reproduction on and from both sides of a floppy disc as shown in FIG. 7.
That is, a pair of head sliders 2, 3 are provided in opposed relation to each other so as to sandwich the floppy disc 1 therebetween under a predetermined force, and magnetic head portions 4, 5 embedded in the respective head sliders 2, 3 come into contact with the floppy disc 1 under predetermined surface pressures for magnetic recording and reproducing. The head sliders 2, 3, being made of a ceramic material, tightly wrap the magnetic head portions 4, 5 and the surfaces thereof coming into contact with the floppy disc 1 are ground smoothly.
In the magnetic recording/reproducing apparatus arranged thus, the recording/reproducing characteristic greatly depends upon the contact state between the magnetic heads 4, 5 and the magnetic recording medium. For example, in a case where the degree of the flatness of the floppy disc 1 is low, difficulty is encountered to in excellently performing the recording/reproducing because of not allowing the floppy disc to reform sufficiently between the pair of upper and lower head sliders 2, 3 so that the magnetic head portions 4, 5 are brought into contact with the floppy disc 1.
Such a problem is remarkable in the case of increased recording density. That is, as the recording density is higher, smaller gaps at the contact portions between the magnetic heads 4, 5 and the floppy disc 1 are required to be kept stably, and it is required to increase the degree of the flatness of the floppy disc 1 or to improve the relative position accuracy between the floppy disc 1 and the heads 4, 5. However, there are problems in that the manufacturing cost becomes higher, and the reproducing force for actually allowing the magnetic recording/reproducing cannot be obtained.
On the other hand, the inventors and the other persons have already proposed a magnetic recording/reproducing apparatus (Japanese Patent Provisional Publication No. 62-52759) in which, as shown in FIG. 8, a disc-like magnetic recording medium 6 rotationally driven about a drive shaft is sandwiched from the upper and lower surfaces thereof by means of a pair of magnetic head devices 7, 8 with a predetermined contact pressure. The magnetic head device 6 comprises magnetic head chips 9, 10 and slider pads 11, 12 provided so as to surround the magnetic head chips 9, 10 at a predetermined interval, and the top portions of the magnetic head chips 9, 10 protrude by predetermined amounts with respect to the surfaces of the slider pads 11, 12 which come into contact with the medium.
FIG. 9 is a perspective view of the magnetic head device of FIG. 8 and shows the outline of the configuration of the slider pad 12. Furthermore, FIG. 10 shows another example of the magnetic head device which has a substantially circular slider pad surface 14, a magnetic head chip 13 being provided in the inside of the slider pad surface 14 so that the top portion protrudes by a dimension .delta. (which will hereinafter be referred to as head protruding amount) from the slider pad surface 14.
In a magnetic recording/reproducing apparatus, another magnetic head device having the same configuration as the illustrated magnetic head device 15 is combined therewith so as to sandwich both surfaces of the floppy disc 6 therebetween as well as the case of FIG. 8.
In the example shown in FIG. 10, a non-woven fabric 16 adheres to the slider pad surface 14 to decrease the sliding friction between the floppy disc 6 and the sliding pad. In this case, it is not required that the sliding pad body be made of a ceramic such as barium titanate which is difficult to be machined.
Here, in the case of the above-mentioned arrangement, in order to realize an excellent contact between the magnetic head
REFERENCES:
patent: 3992576 (1976-11-01), Sugiura
patent: 4071854 (1970-01-01), Bijon et al.
patent: 4320426 (1982-03-01), Thompson
patent: 4809105 (1989-02-01), Imanishi et al.
IBM Technical Disclosure Bulletin vol. 15 No 4 Sep. 1972 Makosch et al., Measuring the flight height of magnetic heads on magnetic disks.
Ichiyanagi Takashi
Watanabe Wataru
Matsushita Electric - Industrial Co., Ltd.
Sniezek Andrew L.
Tupper Robert S.
LandOfFree
Method and apparatus for adjusting the position of a magnetic he does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for adjusting the position of a magnetic he, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for adjusting the position of a magnetic he will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1418602