JPH04252460A - Magnetic head and floppy disk device using the same - Google Patents

Abstract

PURPOSE:To improve electromagnetic characteristic by reducing space between a magnetic gap and a medium by forming the surface of a magnetic head in a cylindrical plane shape. CONSTITUTION:The contact planes 13, 14 of a slider 11 confronting and coming into contact with the medium with magnetic cores 12a, 12b are formed in smooth cylindrical plane shape along the traveling direction of the medium. Therefore, load to sandwich the medium is concentrated on the magnetic gaps 15a, 15b provided almost in the center part of the magnetic cores 12a, 12b, respectively, which stabilizes contact with the medium. The space between the magnetic gap and the medium can be reduced, and magnetic recording and reproduction can be accurately performed. Furthermore, it is possible to efficiently perform electromagnetic conversion with the medium even when high density recording is performed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a magnetic head mounted on a floppy disk device.

0002

2. Description of the Related Art As shown in FIG. 2, a conventional magnetic head includes a double-barreled slider 1 with a high track density core 2a and a low track density core 2b adjacent to each other, which face and contact a medium. Surfaces 3 and 4 were in a flat state (see Japanese Patent Application Laid-Open No. 62-28913). When installed in a single-sided floppy disk device, the medium is sandwiched between the planar slider 1 and a flexible pad. On the other hand, when installed in a double-sided floppy disk device, the two planar sliders 1 sandwich the medium from above and below.

0003

[Problems to be Solved by the Invention] In this conventional magnetic head, the surface in contact with the medium is flat, so in a floppy disk device that sandwiches the medium from both sides, the predetermined load of sandwiching the medium is distributed, and the magnetic core There was a drawback that the load was not concentrated on the magnetic gaps 5a and 5b between 2a and 2b. At this time, the spacing between the magnetic gap and the medium became unstable, making it impossible to perform accurate magnetic recording and reproduction. In addition, the recent increase in recording density has become an increasing problem.

0004

The magnetic head of the present invention is constructed such that the surfaces of the slider and core that come into contact with the medium have a smooth cylindrical shape along the running direction of the medium.

[0005]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the magnetic head of this embodiment. The contact surfaces 13 and 14 of the slider 11 and the magnetic cores 12a and 12b that face and contact the medium are aligned in the running direction 6 of the medium.
It has a smooth cylindrical surface shape. Therefore, the load of sandwiching the medium is concentrated in the magnetic gaps 15a and 15b provided approximately at the center of the magnetic cores 12a and 12b, respectively, so that the contact with the medium becomes stable. The spacing between the magnetic gap and the medium is also reduced, allowing accurate magnetic recording and reproduction. Furthermore, even in the case of future high-density recording, electromagnetic conversion with the medium can be performed efficiently.

FIG. 3 is a plan view of the slider and a cross-sectional view of the slider along the medium running direction 6. According to this, the medium contact surfaces 13 and 14 of the slider 11 have a large radius R and form a cylindrical surface shape. In addition, the direction perpendicular to the medium running direction 6, that is, the radial direction of the medium is linear, and from this, the slider surfaces 13, 1
4 is different from spherical shape. The magnetic head to which the present invention is applied has magnetic gaps 15a and 15b for recording and reproducing, similar to the magnetic head described in Japanese Unexamined Patent Publication No. 2-49207.
Located directly above the media along the radial direction. Therefore, if the slider surface is spherical, either the gap 15a or 15b has the disadvantage that the spacing characteristics with the medium will be poor. Therefore, two types of cores 12a, 1
The above-mentioned cylindrical surface shape is suitable for this composite head that incorporates 2b into one slider, and the gap 15
The spacing of a and 15b can be made good at the same time.

Furthermore, as the radius R of the cylindrical surface increases, the slider surface approaches a flat state, and becomes flat at 1/R=0. At this time, since the minimum spacing between the slider and the medium becomes large, the radius R needs to have an allowable limit. FIG. 4 shows the experimental results of the relationship between the spacing and R, and shows 1/
It has become clear that R must be 0.025 (1/m) or more. The R value at this time is 40 m. On the other hand, as R becomes smaller, the load concentrated on the magnetic gaps 15a and 15b increases, but on the other hand, the manufacturing probability of concentrating the load also decreases. For example, even a slight inclination of the slider due to the dimensional accuracy of other members supporting the slider (such as leaf springs) causes the position of the magnetic gap to deviate from the top of the cylindrical surface, thereby increasing the spacing. For this reason, there is an allowable range for smaller R, and considering the production yield so far, the value of R has been set to a minimum of 5 m. According to the above, R may be within the range of 5 to 40 m.

Next, as shown in FIG. 5, the center position 7 of the radius of the cylindrical surface is set perpendicularly to the medium surface 8 from the magnetic gaps 15a, 15b in order to position the magnetic gaps 15a, 15b at the top of the cylindrical surface. It is located at line 9. Further, a magnetic head device mounted on a double-sided floppy disk device has a structure in which a medium is sandwiched between an upper magnetic head and a lower magnetic head.

FIG. 6 shows an embodiment in which only the surface of the upper magnetic head 21 has a cylindrical surface shape, and in this case as well, the load 22 is concentrated in the magnetic gap.

FIG. 7 shows an embodiment in which only the surface of the lower magnetic head 23 has a cylindrical surface shape, and the operation is the same as that of the embodiment shown in FIG.

[0011]

As described above, the present invention has the effect of reducing the spacing between the magnetic gap and the medium and improving the electromagnetic conversion characteristics since the surface of the magnetic head is formed into a cylindrical shape. This shape will have a great effect on future increases in recording density and spacing characteristics of composite magnetic heads that incorporate two cores in one slider.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the invention.

FIG. 2 is a perspective view of a conventional magnetic head.

FIG. 3 is a front and plan view of a magnetic head according to an embodiment of the present invention.

FIG. 4 is a graph showing the relationship between spacing and R in the magnetic head of the example of the present invention.

FIG. 5 is a schematic diagram showing how the magnetic head according to the embodiment of the present invention is used.

6 and 7 are side views showing an example of use of the magnetic head according to the embodiment of the present invention.

Claims (4)

[Claims] 1. A magnetic head for a double-sided floppy disk device in which a first core for high track density and a second core for low track density are installed adjacently in a slider, in which the slider and the core are in contact with the medium. A magnetic head characterized by a surface having a smooth cylindrical shape along the running direction of the medium. 2. The magnetic head according to claim 1, wherein the radius of the cylindrical surface is within a range of 5 to 40 m. 3. The magnetic head according to claim 1, wherein the center of the radius of the cylindrical surface is located on an extension line perpendicular to the medium surface from a gap provided in the core for performing magnetic recording and reproduction. magnetic head. 4. A floppy disk device characterized in that two magnetic heads according to claim 1 perform recording and reproduction with a medium sandwiched therebetween.