JPH04278257A - Magnetic recording or reproducing apparatus - Google Patents

Abstract

PURPOSE:To attract a disk to a negative-pressure pad stably and to obtain excellent head touch by bonding the negative-pressure pad and a magnetic head to the bonding surface of a head carriage having the required slant angle with a bonding agent. CONSTITUTION:A negative-pressure pad 5 and a magnetic head 4 are fixed to a bonding surface 16 of a bonding part 6c of a head carriage 6 which moves the pad and the head in the radial direction of a magnetic disk 3 as a unitary body with a bonding agent. The slant angle of the surface 16 is made to be equal to the slant angle of the pad 5 in consideration of the moving direction of the carriage 6 when the bonding agent is hardened and the contraction in the rotating direction of the disk 3. Therefore, the inclination of the pad 5 after the bonding and fixing does not become small with respect to the disk 3. The disk 3 is attracted to the pad 5 at the required negative-pressure attracting force, and the excellent head touch is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording or reproducing apparatus for a disk-shaped recording medium, and more particularly to adhesion between a head, a disk regulating section, and a head transport means.

0002

2. Description of the Related Art In a recording or reproducing device for a flexible magnetic recording medium such as a floppy disk, it is necessary to bring a magnetic head (hereinafter referred to as head) into uniform and stable contact with the disk. A method of regulating the disk using a negative pressure pad has been proposed.

Among these proposals, as shown in FIG. 4, a head 40 and a negative pressure pad 50 have been proposed in order to stably attract and obtain a good head touch even when the disk 30 is curved upward.
is placed above the recording surface position A of the disk, which has a surface substantially parallel to the disk support surface, and the negative pressure pad 50
There is a method in which the head 40 and the head 40 are tilted toward the inner circumference by an appropriate amount, and the rear side is tilted slightly in the direction of rotation of the disk 30 so that the rear side is away from the disk. In this case, the head 40 and the negative pressure pad 50 are bonded and fixed to the head carriage 60 (FIG. 5) in the above-described posture. When the head 40 and the negative pressure pad 50 are bonded to the head carriage 60 in the above-described posture, the bonding surfaces 61 and 62 of the bonding portion 60a of the head carriage 60 are either horizontal (FIG. 5(a)) or vertical. The head 40 and the negative pressure pad 50 are held in the above-described posture by the adhesive between the head 40 and the negative pressure pad 50 and the adhesive surface of the head carriage 60 (FIG. 5(b)). There is.

0004

However, in the above conventional example, the adhesive surfaces 61, 6 of the head carriage 60
2 was on a horizontal or vertical plane. Therefore, when bonding the head 40 and the negative pressure pad 50 at a predetermined angle, as shown in FIG. 5, when the adhesive contracts, the adhesive layer 99 is The thickness was changing. Therefore, there is a risk that the head 4 and negative pressure pad 5 may become less inclined, lose their inclination, or be inclined to the opposite side due to shrinkage due to adhesive curing during assembly or shrinkage of the adhesive in a low-temperature environment. In some cases, it was not possible to obtain a stable head touch.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a driving means for rotationally driving a magnetic disk;
a magnetic head for recording or reproducing data on or from the magnetic disk; a disk regulating section disposed to surround the magnetic head and capable of attracting the magnetic disk by a negative pressure action; head transporting means for transporting the magnetic head to a predetermined recording position; the magnetic head and the disk regulating section are adhesively fixed to the head transporting means in a state having a predetermined inclination to the supporting surface of the magnetic disk; The transfer means is provided with an adhesive portion having an adhesive surface having an inclination equal to or greater than the predetermined inclination.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to a 2-inch floppy disk drive.

Reference numeral 1 denotes a disc jacket in which a recording disc 3 is housed. 2 is a center core of the disk 3, which is securely fitted with the spindle motor 10.

13 is a disk drive device. 4 is a head, and 5 is a negative pressure pad, details of which will be described later. The head 4 and negative pressure pad 5 are adhesively fixed to a head carriage 6. The end portion 6a of the head carriage 6 is engaged with a head feeding mechanism, that is, a motor 9, and a lead screw 8 via a convex portion 7a of an elastic member 7 such as a leaf spring. The other end 6b is fitted and supported by the guide shaft 12, and is moved by a predetermined amount in the radial direction of the disk 3 by the drive of the motor 9.

Reference numeral 10 denotes a spindle motor for rotating the disk 3, and has a chucking section 11. This chucking portion 11 detachably holds the disk 3 by a known means. This rotation of the spindle motor 10 causes the disk 3 to rotate, and at this time, a negative pressure is generated between the disk 3 and the negative pressure pad 5 due to a hydrodynamic action, the disk 3 is attracted to the negative pressure pad 5, and the disk 3 and the head 4 come into contact uniformly and stably, and a good head touch can be obtained.

As shown in FIG. 2(a), the head 4 has its tip located 100 μm above the position A of the recording surface of the disk where the disk surface is approximately parallel to the disk supporting surface.
m to 150 μm above B, and is fixedly supported by adhesive on the adhesive portion 6c of the head carriage 6 so as to be perpendicular to the negative pressure pad 5. The negative pressure pad 5 is connected to the spindle motor 10 in the radial direction of the disk 3.
The negative pressure pad 5 is tilted by 0.3° to 1° so that the side (left side in the figure) is lower, and as shown in FIG. The magnetic head 4 is fixedly supported by adhesive on the head carriage 6 with the magnetic head 4 tilted by 0.1° to 0.3° so as to separate from the disk 3 (center left side). The adhesive surface 16 of the adhesive part 6c of the head carriage 6 that adheres the head 4 and the negative pressure pad 5 is attached in the radial direction and rotational direction of the disk 3, as shown in FIG. Tilt equal to or greater than the slope.

Adhesive portion 6 of such head carriage 6
When the head 4 and the negative pressure pad 5 are attached to the disk at a predetermined angle in the radial and rotational directions of the disk, an adhesive layer 9 is formed.
If 9 is uniform, the shrinkage of the adhesive is uniform, and the head 4
Also, the posture of the negative pressure pad 5 does not change due to contraction of the adhesive. In addition, if the adhesive layer 99 is thicker on the inner circumferential side and rear side as shown in FIG. It is conceivable that the contraction on the rear side is large and the inclination of the head 4 and the negative pressure pad 5 becomes large. Therefore, during actual assembly, the increase in inclination in each direction when the adhesive hardens is estimated, and the bonding is performed at an angle obtained by subtracting the expected increase in inclination from a predetermined angle in each direction.

Furthermore, since the adhesive contracts when used in a low-temperature environment, the inclinations of the head 4 and the negative pressure pad 5 in the circumferential direction and rotational direction may similarly increase due to the contraction of the adhesive. However, it does not become smaller, lose its slope, or tilt to the opposite side. Therefore, the disk 3 is stably attracted to the negative pressure pad 5 even in a low temperature environment, and a good head touch can be obtained.

[0014] When used in a high temperature and high humidity environment, the adhesive will stretch, so the inclination of the head 4 and negative pressure pad 5 may become smaller than the predetermined angle. At the bottom, the rigidity of disk 3 is also reduced,
It has good ability to follow the suction force, and as long as the head 4 and the negative pressure pad 5 do not tilt in the opposite direction to the predetermined tilt direction, stable suction is achieved even if the shoulder of the negative pressure pad pushes up the disk somewhat. This allows a good head touch to be obtained.

FIG. 3 shows another embodiment. In the embodiment described above, the adhesive surface 16 was formed on the upper surface of the adhesive portion 6c of the head carriage 6, but in this embodiment, the adhesive surface 17 is formed by making the side surface of the adhesive portion 6c slope. Figure 3 (a
) shows the moving direction of the head carriage 6, and FIG. 3(b) shows the rotating direction of the disk 3. As is clear from FIG. 3, in this embodiment, the lower part of the head 4 can be housed in the adhesive part 6c, so that miniaturization is possible.

[0016]

As explained above, by making the adhesive surface of the adhesive part provided on the head carriage equal to or larger than the predetermined inclination angle of the head and disk regulating part, when the adhesive contracts, the head and Since it is possible to form an adhesive layer that does not reduce the inclination of the disc regulating part,
Assembly can be facilitated.

Furthermore, even when used in a low-temperature environment, the inclination of the head and disk regulating portion does not become smaller due to shrinkage of the adhesive, so the disk is stably attracted to the negative pressure pad and a good head touch is achieved. This improves the reliability of the device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to a 2-inch floppy disk drive device.

FIG. 2 is a diagram showing the details of the embodiment, in which (a) is a diagram showing the state in the disk radial direction, and (b) is a diagram showing the state in the disk rotation direction.

FIG. 3 is a diagram showing another embodiment, in which (a) is a diagram showing the state in the disk radial direction, and (b) is a diagram showing the state in the disk rotation direction.

FIG. 4 is a diagram illustrating the posture of the head and negative pressure pad with respect to the disk.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

3 Magnetic disk 4 Magnetic head 5 Negative pressure pad 6 Head carriage 6c Adhesive part 16 Adhesive surface 99 Adhesive layer

Claims (1)

[Claims] 1. A driving means for rotationally driving a magnetic disk, a magnetic head for recording or reproducing data on the magnetic disk, and a drive means arranged to surround the magnetic head, and capable of attracting the magnetic disk by a negative pressure action. and a head transport means for transporting the magnetic head to a predetermined recording position on the magnetic disk, the magnetic head and the disk regulating portion having a predetermined inclination to the supporting surface of the magnetic disk. A magnetic recording or reproducing device, the magnetic recording or reproducing device being adhesively fixed to the head transporting means in a state,
A magnetic recording or reproducing apparatus characterized in that the head transporting means includes an adhesive section having an adhesive surface having an inclination equal to or greater than the predetermined inclination.