Claims
- 1. A magnetic head assembly for recording and/or reproducing an information signal on and from a disk-shaped rotary magnetic recording medium contained in a housing with an access opening having a length m in a rotational direction of the recording medium, said magnetic head assembly comprising:
- a base;
- a slide surface defined on said base so as to make a contact with the disk-shaped rotary magnetic recording medium; and
- a magnetic core embedded in said slide surface;
- wherein said slide surface extends in a longitudinal direction which coincides to the direction of rotation of the disk-shaped rotary magnetic recording medium with such a configuration that a length B of the slide surface which is a dimension of the slide surface in its longitudinal direction and a width A of the slide surface which is a dimension of the slide surface in a lateral direction perpendicular to said longitudinal direction satisfy a relation B/A.gtoreq.4; wherein the length B is set so as to satisfy a relation 0.35 m.ltoreq.B.ltoreq.0.55 m; and wherein said slide surface is finished with high precision such that the surface roughness of the slide surface is substantially smaller than the surface roughness of a recording surface of the disk-shaped rotary magnetic recording medium on which the information signal is recorded.
- 2. A magnetic head assembly as claimed in claim 1 in which the length B and the width A satisfy the relation B/A.gtoreq.5.
- 3. A magnetic head assembly as claimed in claim 1 in which the length B is set so as to satisfy a relation 0.35 m.ltoreq.B.ltoreq.0.45 m.
- 4. A magnetic head assembly as claimed in claim 1 in which the length B is set so as to satisfy a relation 0.45 m.ltoreq.B.ltoreq.0.55 m.
- 5. A magnetic head assembly as claimed in claim 1 in which the magnetic recording medium and housing comprise a flexible magnetic disk having a standardized diameter of 3.5 inches and accommodated in a cartridge having a rigidity substantially larger than a flexible magnetic disk, and in which the length 8 is set so as to satisfy a relation 0.45 m.ltoreq.B.ltoreq.0.55 m.
- 6. A magnetic head assembly as claimed in claim 1 in which the magnetic recording medium and housing comprise a flexible magnetic disk having a standardized diameter of 5.25 inches and accommodated in a flexible jacket, in which the length B and the width A satisfy the relation B/A.ltoreq.5, and in which the length B is set so as to satisfy a relation 0.35 m.ltoreq.B.ltoreq.0.45 m.
- 7. A magnetic head assembly as claimed in claim 1 in which said slide surface defined by the length A and the width B is made flat, and the magnetic core embedded in the slide surface is defined by a flat surface which is flush with the slide surface.
- 8. A magnetic head assembly as claimed in claim 1 in which said slide surface including said flat surface of the magnetic core is polished so as to show a specular gloss.
- 9. A magnetic head assembly as claimed in claim 1 in which said slide surface including said flat surface of the magnetic core is polished to such a degree that the maximum difference between the peak and the bottom of projections and depressions remaining on the slide surface is substantially less than 0.3 jum.
- 10. A magnetic head assembly as claimed in claim 1 in which said slide surface is divided into a first slide surface part and a second slide surface part by a groove extending in the direction of rotation of the disk-shaped rotary magnetic medium.
- 11. A magnetic head assembly as claimed in claim 10 in which said magnetic core extends in the direction of rotation of the disk-shaped rotary magnetic recording medium and is embedded in one of said first and second slide surface parts such that a surface defining the magnetic core forms a flush surface with the slide surface part on which the magnetic core is embedded.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 62-294209 |
Nov 1987 |
JPX |
|
BACKGROUND OF THE INVENTION
The present invention is a continuation-in-part application of the U.S. patent application Ser. No. 273,892 filed Nov. 21, 1988, now abandoned.
The present invention generally relates to magnetic heads of a magnetic recording/reproducing apparatus for recording and/or reproducing an information signal on and from a rotary magnetic disk, and in particular to a magnetic head assembly which can avoid mechanical vibration associated with rotation of the rotary magnetic disk during the recording and/or reproducing operation of the magnetic recording/reproducing apparatus.
Generally, a flexible magnetic disk commonly referred to as a floppy disk is recorded or reproduced with an information signal by a magnetic recording/reproducing apparatus comprising a magnetic head disposed so as to contact with an upper and/or lower surface of the magnetic disk. The magnetic head is urged on the surface of the magnetic disk, and magnetizes a magnetic material deposited on the surface of the magnetic disk according to the information signal or produces an electrical signal on the basis of the magnetization of the magnetic disk.
In such a magnetic recording/reproducing apparatus, it is essential to maintain proper contact between the magnetic disk and the magnetic head in order to achieve a proper and satisfactory recording and/or reproduction. Thus, the magnetic head is carried on a resilient mechanical system which resiliently urges the magnetic head on the surface of the magnetic disk. However, such a resilient mechanical system tends to cause a large mechanical resonance when the frequency of the vibration of the magnetic head coincides with the resonant frequency of the mechanical system. In such a case, the magnetic head experiences a leap on the surface of the magnetic disk and erroneous recording or reproduction or even the dropout of the information signal may occur.
Conventionally, various systems have been proposed in order to avoid the resonance of the mechanical system carrying the magnetic head. For example, an additional elastic member is mounted on the mechanical system so as to change the resonant frequency. Alternatively, a vibration absorber having a low Q value is added to the resilient mechanical system. However, the provision of such an additional elastic member on the mechanical system results in an increase in size of the mechanical system and the magnetic recording/reproducing apparatus becomes large as a result. Further, the cost of manufacturing the magnetic recording/reproducing apparatus is increased. On the other hand, when the low O material is added to the mechanical system, response in the mechanical system at the time of following the displacement or deformation of the magnetic disk becomes untolerably slow and the magnetic head cannot maintain proper contact with the magnetic disk. This eventually leads to the loss of contact between the magnetic head and the magnetic disk which in turn leads to erroneous recording or reproduction of the information signal.
Accordingly, it is a general object of the present invention to provide a novel and useful magnetic head assembly wherein the aforementioned problems are eliminated.
Another and more specific object of the present invention is to provide a magnetic head assembly of a magnetic recording/reproducing apparatus for recording and/or reproducing an information signal on and from a magnetic disk contained in a housing, said housing having a window with a length m for allowing the magnetic head assembly to make a contact with the magnetic disk, said magnetic head assembly comprising a slide body on which a magnetic core for recording and/or reproduction of the information signal is provided, wherein a slide surface is defined on the slide body for contacting with the surface of the magnetic disk with such a configuration that a length B of the slide surface in the rotational direction of the magnetic disk and a width A of the slide surface in the radial direction of the magnetic disk are chosen so as to satisfy a relation B/A.gtoreq.4 and that the length B satisfies a relation 0.35 m.ltoreq.B.ltoreq.0.55 m.
According to the present invention, the vibration of the magnetic head assembly can be avoided without deteriorating the follow-up response of the magnetic head assembly following up the displacement or deformation of the magnetic disk. In other words, the present invention realizes a simple magnetic head assembly performing a stable recording and reproducing performance without adding extra members to the mechanical system carrying the magnetic head.
Other objects and further features of the present invention will become apparent from the following detailed description of a preferred embodiment of the present invention when read in conjunction with attached drawings.
US Referenced Citations (1)
| Number |
Name |
Date |
Kind |
| 4835640 |
Endo |
May 1989 |
|
Non-Patent Literature Citations (1)
| Entry |
| Saishin Denshi Zairyo-gaku (Updated Electronic Materials), published from Fukkan Publishing Company of Tainan City, Taiwan in 1983. |
Continuation in Parts (1)
|
Number |
Date |
Country |
| Parent |
273892 |
Nov 1988 |
|
Patent Grant
5043833
