JPS5823645B2 - Movable magnetic head for magnetic disks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called monolithic magnetic disk orbiting magnetic head.

In a conventional magnetic head of this type, as shown in FIG. 4 is disposed so as to be parallel to the moving direction of the magnetic disk when the disk rotates.

Therefore, when the magnetic head moves in the radial direction of the magnetic disk, if there are protrusions or dust on the magnetic disk surface, the protrusions or dust will move toward the ridgeline 2 or the ridgeline with a velocity component perpendicular to the direction of the ridgelines 2 and 4. This results in a collision with section 4.

However, since the entire structure is made of ferrite, and the width of the recording/reproducing track portion is extremely narrow at several tens of μm, the ridgeline portion 2, which is weak in strength, is particularly susceptible to damage, and the ridgeline portion 2 near the recording/reproducing magnetic gap portion 5 is easily damaged. There is a drawback that if the ridgeline portion 2 is damaged, normal recording and reproducing functions cannot be maintained.

In view of the above points, the present invention provides a magnetic disk orbiting magnetic head that is capable of reducing or eliminating impact between protrusions and dust on the surface of the magnetic disk and the side edges of the recording/reproducing track section. It provides
The drawings will be explained in detail below.

FIG. 2 shows an embodiment of the present invention, in which numeral 11 is a recording/reproducing track section in which each section of a rotating magnetic disk is directed toward the magnetic head one after another (from one end side to the opposite side). The width toward the end, that is, the ridgeline portions 12, 1 on both sides
The width between the two is gradually narrowing.

Reference numeral 13 denotes a portion of a slide dash formed through grooves on both sides of the recording/reproducing track, and the ridgeline portions 14 on both sides thereof are parallel as in the conventional case.

15 is a recording/reproducing magnetic gap portion, and 16 is a coil winding portion.

Such a magnetic head can be manufactured by conventional machining, but it can be easily manufactured by ion etching technology.

Next, the operation of the magnetic head of the present invention will be explained with reference to FIG. 3. When the magnetic head moves in the radial direction of the magnetic disk while the magnetic disk is rotating, it will now move onto the surface of the magnetic disk at the position shown in the figure. Assuming that there is a protrusion or dust P, and the angle between the center line of the recording and reproducing track section 11 and its ridgeline section 12 is θ, and the protrusion or dust P moves with respect to the center line of the recording and reproducing track section 11, (Let the angle θ' be θ'.

Therefore, the angle at which the protrusion or the dust P moves with respect to the ridgeline portion 12 of the recording/reproducing track portion is θl−θ.

This angle is smaller than in the conventional case in which the ridgeline sections on both sides of the recording/reproducing track section are parallel and the angle formed with the center line is O, and the impact force on the ridgeline section 12 due to the protrusion or dust P is reduced accordingly. It happens.

Furthermore, the recording/reproducing track section 11 is set such that θ>θ'.
By selecting the angle formed by the center line and the ridge line 12, the protrusion or dust P will not collide with the ridge line part 12.

For example, the rotation speed of the magnetic disk is 30 m/sec, and the maximum moving speed of the magnetic head in the radial direction of the magnetic disk is 2.
ml sec, tan θl=2/30, that is, the maximum value of θ′ is about 3.8°, and if θ>38°, there will be no protrusion on the ridgeline portion 12 or collision with the dust P.

According to the present invention, as described above, each part of the magnetic disk rotating through the width of the recording/reproducing track section gradually moves from the end facing the magnetic head to the opposite end. By making it narrower, even if there are protrusions or dust on the surface of the magnetic disk, it is possible to reduce or eliminate the impact caused by the protrusions or dust on the ridgeline of the recording/reproducing track section, thereby preventing damage to the ridgeline. It can be reduced or eliminated.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional magnetic disk rotating magnetic head, FIG. 2 is a perspective view of an embodiment of the present invention, and FIG. 3 is a detailed explanatory diagram of the present invention. 11...Track section for recording and reproduction.

Claims (1)

[Claims] 1. In a monolithic magnetic disk orbiting magnetic head that faces a rotating magnetic disk and performs recording and reading on the magnetic disk, a groove is formed between each of the slide dashes on both sides, respectively. The width of the recording and reproducing track section is gradually narrowed from the end of the rotating magnetic disk that faces the magnetic head one after another to the opposite end. A magnetic head featuring: