JPH02156464A - Magnetic sheet device - Google Patents

Abstract

PURPOSE:To accurately decide the relative position of a stabilizing plate, etc., by supporting a supporting plate provided integrally with the stabilizing plate and a spindle motor and a head carriage fixed with a magnetic head with a guide member based on a guide reference plane as a reference for the guide member. CONSTITUTION:The supporting plate 25 is disposed under a bridge state between guide bars 17 and 18 for supporting the head carriage 16 fitted with the head 19 freely slidabley along an outer circumferential surface as the guide reference plane, and both end parts are fixed to the guide bars 17 and 18 respectively. The supporting plate 25 is provided fixedly and integrally with the spindle motor 15 for rotatively driving a magnetic disk sheet 14, while the stabilizing plate 20 for keeping the sheet abutted against the head 19 excellently is formed integrally with the supporting plate 25 with a recessed groove 22 between them as a head moving gap. By this method, the relative position between the stabilizing plate 20 and the motor 15 to be set up on a fitting part is extremely easily and accurately decided.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a magnetic sheet device equipped with a stabilizing plate that generates negative pressure between a rotating magnetic sheet and draws the magnetic sheet toward a magnetic head. Regarding.

<Prior Art> As shown in FIG. 6, an example of a conventional magnetic sheet device, a spindle motor 15 for rotationally driving a magnetic disk sheet 14 is attached to a base plate 13. Further, both ends of two side bars 17 and 18 are fixed and supported on the base plate 13 by two sets of support members 12 that project from the base plate 13. These guide bars 17, 18 are
A head carriage 16 disposed adjacent to the spindle motor 15 is slidably supported, and a magnetic head 19 is provided on the second helad carriage 16 . The head carriage 16 is driven by a drive device (not shown) along guide bars 17.18, and thereby the magnetic head 19 is moved and positioned in the radial direction (in the direction of arrow C) of the magnetic disk sheet 14 mounted on the spindle motor 15. It is now possible to do so.

The magnetic disk sheet 14 mounted on the spindle motor 15 is rotated at high speed in the direction of arrow R by the drive of the spindle motor 15, and the magnetic head 19 comes into sliding contact with the magnetic disk sheet 14, thereby rotating the magnetic disk sheet. Recording/reproduction for 14 is performed. Also,
By moving the magnetic head 19 in the radial direction of the magnetic disk sheet 140, the track on the magnetic disk sheet 14 on which recording and reproduction is performed is changed.

Further, in order to maintain good contact between the magnetic disk sheet 14 and the magnetic head 19, a stabilizing plate 20 is fixed to the base plate 13 so as to sandwich the magnetic head 19.

This stabilizer plate 20 has a surface 21 facing the magnetic disk sheet 14 that is inclined in a direction that becomes further away from the rate surface where the magnetic disk sheet 14 is in a stopped state as it goes downstream in the direction of rotation of the magnetic disk sheet 14. First, airflow generated as the magnetic disk sheet 14 rotates is introduced between the inclined surface 21 and the magnetic disk sheet 14, thereby generating negative pressure. Is there a concave in the center of this inclined surface 21? W22 is formed, and this concave W12
A magnetic head 19 moves within 2. Therefore, as the magnetic disk sheet 14 rotates, negative pressure is generated between the inclined surface 21 and the magnetic disk sheet 14, and the magnetic disk sheet 14 is drawn toward the magnetic head 19, thereby achieving a good head touch. It is.

<Problems to be Solved by the Invention> In order to achieve an appropriate head touch for good recording and reproduction in a magnetic sheet device, first the magnetic head 1
The leading edge position of the magnetic disk 9 must be positioned extremely accurately with respect to the recording surface of the magnetic disk sheet 14. For this reason, the installation position of guide bars 17 and 18 that slidably support the head carriage 16 provided with the magnetic head 19 is usually set at the position formed on the rotating shaft 23 of the spindle motor 15 and on the magnetic disk seat (not shown) 14. By accurately positioning the center core with respect to the reference surface 11 that is fitted into it and making close contact with it, and by finely adjusting the magnetic head 19 itself,
The tip of the magnetic head 19 is accurately positioned with respect to the magnetic disk sheet 14. On the other hand, it is also extremely important to accurately mount the stabilizing plate 20, which is provided in this magnetic sheet device and generates negative pressure between it and the magnetic disk sheet 14. This is because the inclined surface 21 formed on the stabilizer plate 20
position relative to the magnetic disk sheet 14, especially the inclined surface 2
This is because a slight difference in the inclination angle with respect to the sheet 14 causes a very large variation in the amount of negative pressure generated, which hinders the realization of a good head touch. Therefore, in the past, the stabilizer plate 20 was directly fixed onto the base plate 13 while being accurately positioned with respect to the reference plane 24 of the spindle motor 15. However, in this case, the stabilizing plate 20 and the above-mentioned magnetic head 19 must be individually and precisely positioned with respect to the reference plane 24 of the spindle motor 15, which not only makes the manufacturing process extremely complicated, but also makes both There was a problem in that the positioning accuracy itself varied, making it difficult to achieve a good head touch.

Means for Solving the Problems> A magnetic sheet device according to the present invention includes a guide member having a guide reference surface, a support plate fixed to the guide member with reference to the guide reference surface of the guide member, and the support plate. a spindle motor that is provided integrally with the plate and rotates the magnetic sheet; a head carriage that is slidably supported in the radial direction of the magnetic sheet by the guide reference surface of the guide member; A magnetic head capable of contacting the magnetic sheet is integrally formed with the support plate, and generates a negative pressure between the magnetic sheet and the magnetic sheet as the magnetic sheet rotates to move the magnetic sheet toward the magnetic head. It is characterized by being equipped with a stabilizing plate that pulls it towards the ground.

Function: A head carriage provided on a guide member having a guide reference surface so as to be slidable with reference to the guide reference surface slides in the radial direction of the magnetic sheet, and the magnetic head provided on the head carriage slides in the radial direction of the magnetic sheet. moves while being accurately positioned with respect to the recording surface of the magnetic sheet. Further, a support plate is fixed to the guide member, and a spindle motor and a stabilizing plate are integrally formed on this support plate while accurately positioning each other. are all accurately positioned at the same time with respect to the guide reference plane of the guide member, so that a good head touch is achieved.

Embodiment Hereinafter, one embodiment of the magnetic sheet device according to the present invention will be described in detail with reference to the drawings. It should be noted that members that are the same as those in the prior art will be denoted by the same reference numerals, and a detailed explanation thereof will be omitted.

As shown in FIG. 1, this embodiment has a magnetic head 19.
Two guide bars 17 support the head carriage 16 slidably along the outer peripheral surface which is a guide reference surface.
．． A support plate 25 is disposed between the support plates 18 in a hanging manner, and both ends thereof are fixed to the guide bars 17 and 18, respectively. A spindle motor 15 for rotationally driving the magnetic disk sheet 14 is integrally fixed to the support plate 25, and a stabilizing plate 20 for maintaining good contact between the magnetic disk sheet 14 and the magnetic head 19 is attached to the support plate 25. It is formed integrally with the support plate z5, sandwiching a groove 22 which is a movement gap.

In other words, for example, if the support plate 25 and the stabilizing plate 20 are integrally molded, and the mounting part of the spindle motor 15 is also molded at the same time, the mounting of the stabilizing plate 20 and the spindle motor 15 installed in the part can be done in a relative manner. The position can be determined very easily and accurately without complicated positioning work. In addition to the support plate 25 in which the stabilizing plate 20 and the spindle motor 15 are integrally formed, the guide bar 1
7.18, and the magnetic head 19 is also supported by the outer circumferential surface of the guide bar 17 and 18 via the head carriage 16. Spindle motor 15 and stabilizer plate 2
The relative position between 0 and the magnetic head 19 is determined by the guide bar 17.1.
It is determined extremely accurately via the outer circumferential surface (guiding reference surface) of No. 8.

FIG. 2 is a schematic cross-sectional view of the support plate 25 provided integrally with the stabilizer plate 20 and the spindle motor 15, taken along the longitudinal direction of the guide bar 17°18. As shown in this figure, the above-mentioned stabilizer plate 20 is protruded from the upper right end of the support plate 25 in the figure, and the stabilizing plate 20 is provided at the approximate center of the support plate 25 in a manner that is accurately aligned with the stabilizer plate 20. A positioned fixing hole 26 is formed vertically through the fixing hole 26, and a fixing shaft 27 of the spindle motor 15 is fitted into this fixing hole 26. Further, a rotor 29 having a permanent magnet is rotatably provided on the fixed shaft 27 via a rolling bearing 28 fitted on the fixed shaft 27, and the rotor 29 has a center hub (not shown) of the magnetic disk sheet 14. The center hub receiver portion 30 into which the stabilizer plate 20 is inserted is formed integrally and concentrically with the stabilizer plate 20 in a state where it is accurately positioned in advance. Further, a coil 31 is fixedly installed on the support plate 25 facing the rotor 29, and when the coil 31 is energized, the rotor 29 rotates, and the magnetic disk sheet 14 inserted into the center hub receiver part 30 rotates. do.

Moreover, FIG. 3 is a sectional view taken along the arrow lN-1 in FIG.
The attachment of the support plate 25 to the guide bars 17, 18 represents the state. That is, the guide bars 1 are provided at the bottom of each of the left and right edges of the support plate 25 in the figure. , 18 are provided with step portions 33 in which positioning surfaces 32 that can abut the respective outer circumferential surfaces (guide reference surfaces) at two positions are formed.

In other words, the support plate 25 is the positioning surface 3 of these stepped portions 33.
The screws 34 are placed on the guide bars 17.18 with the screws 34 in contact with the outer circumferential surfaces of the guide bars 17.18, and are provided in the stepped portions 33 so as to sandwich the respective guide bars 17.18. and the guide bar 17 by the presser plate spring 35.
．． 18, respectively. Furthermore, as described above, since the magnetic head 19 is also supported on the outer peripheral surfaces of the guide bars 17 and 18 via the head carriage, the relative positions of the spindle motor 15, the stabilizer plate 20, and the magnetic head are extremely accurate. Be determined.

FIG. 4 is a schematic cross-sectional view showing the structure of mounting the spindle motor 15 on the support plate 25 according to another embodiment.
This corresponds to the figure. That is, the above-mentioned stabilizing plate 20 is protruded from the upper right end of the support plate 25 in the drawing, and a fixing hole accurately positioned with respect to the stabilizing plate 20 is provided at approximately the center of the support plate 25 in the drawing. 26 is formed to penetrate vertically. A rotating shaft 36 of the spindle motor 15 vertically passes through the support plate 25 and is fitted into the fixing hole 26 via a rolling bearing 28 fitted in the fixing hole 26 so as to be freely rotatable. Further, at the upper end of the rotating shaft 36 above the support plate 25, a center hub receiver portion 30 into which a center hub (not shown) of the magnetic disk sheet 14 is inserted is accurately positioned in advance with respect to the stabilizing plate 20. It is attached in good condition. Furthermore, a rotor 29 having a permanent magnet is fitted to the lower end of the rotary shaft 36 below the support plate 25, and a coil 31 is fixed to the support plate 25 on the side opposite to the upper end surface of the rotor 29. By energizing this coil, the rotor 29 rotates, and the magnetic disk sheet 14 inserted into the center hub receiver 30 rotates.

By the way, in the support plate 25 according to the above embodiment, the support plate 2
Although the stepped portions 33 were provided on the side of the base plate 13 at both end portions of 5, on the contrary, as shown in FIG. The guide bars 17, 18 may be brought into contact with the surface 32 and fixed with screws 34, presser plate springs 35, etc. Further, the fixing means such as the screw 34 or the presser plate spring 35 used in the previously described embodiments are not particularly limited to these, and are not made of stones, and furthermore, the stepped portion 33 may not be particularly provided. In addition, the shape of the guide member that guides and supports the helad carriage 16 is rod-shaped as in this embodiment.
It is not limited to only 8. Furthermore, the structure in which the stabilizing plate 20 and the spindle motor 15 are integrally provided on the supporting plate 25 is not limited to this embodiment. The fixed head carriage 16 may be supported by the guide reference surface of the guide member.

<Effects of the Invention> According to the magnetic sheet device of the present invention, the support plate on which the stabilizing plate and the spindle motor are integrally provided, and the head carriage on which the magnetic head is fixed, move the guide member with reference to the guide reference plane of the guide member. By being supported by the member, the relative positions of the stabilizer, spindle motor, and magnetic head can be determined all at once with respect to the same reference plane with great accuracy and ease. In addition to greatly simplifying the work process and reducing costs,
Appropriate head touch can be obtained and good recording and playback can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the magnetic sheet device according to the present invention, FIG. 2 is a schematic cross-sectional view of the support plate in the embodiment, and FIG. 1st arrow sectional view, 4th
5 is a schematic cross-sectional view of a support plate according to another embodiment, and FIG. 6 is a perspective view showing an example of a conventional magnetic sheet device. In the drawing, 13 is plywood, 14 is magnetic disk sheet, 15
1 is a spindle motor, 16 is a carriage, 17 and 18 are guide bars, 19 is a magnetic head, 20 is a stabilizer plate, 25 is a support plate, 27 is a fixed shaft, 29 is a rotor, 30 is a center hub receiver, 31 is a coil, 33 is a stepped part.

Claims (1)

[Claims] a guide member having a guide reference surface; a support plate fixed to the guide member with reference to the guide reference surface of the guide member; and a spindle motor that is provided integrally with the support plate and rotates a magnetic sheet; a head carriage slidably supported in the radial direction of the magnetic sheet by the guide reference surface of the guide member; a magnetic head provided on the head carriage and capable of abutting the magnetic sheet; and integral with the support plate. 1. A magnetic sheet device comprising: a stabilizing plate that is formed in a circular pattern and generates a negative pressure between the magnetic sheet and the magnetic sheet as the magnetic sheet rotates to draw the magnetic sheet toward the magnetic head.