JPS601645A - Magnetic disk driver - Google Patents

Abstract

PURPOSE:To improve the stability for rotary driving of a magnetic disk by bearing a disk driving shaft within a shaft inserting slot and producing the twist to a pressure bar which gives the springy pressure to the positioning surface formed within said slot. CONSTITUTION:The inserting depth l1 into an inserting slot 14 of a rotary shaft 16 of a magnetic sheet S is set less than the thickness t1 of a center core 2, i.e., <=1/2 total height of a pressure bar 21. As a result, a twist is produced so that the bar 21 is tilted toward the center of the slot 14 at the side of an upper end 21B with both ends 21a and 21a of the bar 21 defined as fulcrums respectively. Thus the spring contact is reduced for the bar 21 owing to said twist. Therefore no shift is produced between the revolving center of the sheet S and the axial core of the shaft 16 even with the reduced attracting powe of a magnet 13 and the increased spring force of the bar 21. Thus the shaft 16 can be smoothly put into the slot 14. As a result, the loading state of the sheet S to a driving shaft 15 and the sheet S can be revolved with high stability.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention records information, such as a still image, on a magnetic recording surface of a magnetic tape with an annular track, or reproduces information recorded on this track. The present invention relates to a magnetic disk drive device for rotationally driving the magnetic disk.

<Background Art and its Problems> Recently, devices have been proposed in which still images are recorded on a sorted magnetic disk (hereinafter referred to as magnetic sort), or in which the recorded still images are played back.

As shown in FIG. 1, a center core 100 formed in an annular shape and made of synthetic resin is attached to the rotational center of the magnetic sheet S on which the still image is recorded. Core 1 above
00 has a shaft insertion hole 102 into which a TiSF drive shaft 101 on the magnetic recording device side is inserted, passing through it in the vertical direction in the figure.

A positioning surface IL13 for aligning the rotation center of the magnetic sheet S with the axis of the drive shaft 101 is formed in the shaft insertion hole 102. The positioning surface 103 serves as a reference to determine the center of rotation of the magnetic sheath S with respect to the drive shaft 101.

However, the shaft insertion hole 102 facing the positioning surface 103
The drive shaft 101 is placed on the positioning surface 1.
A pressing piece 104 for elastically pressing the shaft insertion hole 102 is integrally formed so as to extend in the axial direction of the shaft insertion hole 102. Note that the suppressing piece 104 is integrally formed with the core 1[]0 from synthetic resin.

The drive shaft 101 includes a cylindrical rotating shaft 105 that is inserted into the shaft insertion hole 102, and a fixed shaft 107 that is coaxially inserted into the rotating shaft 105 through a bearing 106. Become.

The rotating shaft 105 is connected to a rotating shaft of a drive motor (not shown), and the magnetic sheet S is rotationally driven by the driving force of the motor.

In the memo core 100, on one end surface on the side where the drive shaft 101 is inserted, there is an annular magnet 10 fixed on a rotary table 108 that is integrated with the rotary shaft 105.
An annular metal plate 110 that is attracted by 9 is fixed. That is, when the magnetic sheet 1-s is loaded into a magnetic recording device, the magnetic sheet S is attracted toward the drive shaft 101 by the attractive force of the magnet 109 acting on the metal plate 110. As a result, the drive shaft 1
01 is fitted into the shaft insertion hole 102, so that the center of rotation of the magnetic sort S and the axis of the drive shaft 101 are positioned.

As shown in FIG.
05a is inserted so as to reach near the top of the shaft insertion hole 102. Therefore, the drive shaft 10
1 is pressed in parallel to the positioning surface 103 by substantially the entire surface of the pressing surface 104A of the pressing piece 104. That is, the first drive shaft 101 is moved to the positioning surface 103 by the spring constant of the pressing piece 104.
will be under pressure.

By the way, in order to ensure that the rotation center of the magnetic seam 1-S coincides with the axis of the rotation shaft 105,
It is preferable that the spring force of the suppressing piece 104 is large T1. However, as described above, especially in the case where the rotating shaft 105 is inserted into the shaft insertion hole 102 by the suction force of the magnet 109, if the spring force of the pressing piece 104 is large, the rotating shaft 105 is It is quite difficult to insert the insertion hole 102 at a predetermined position. Therefore,
In order to smoothly insert the rotating shaft 105 into the shaft insertion hole 102 at the predetermined position 1, the suppressing piece 104
If the spring force of 1. is made small, magnetic no. 1.
s cannot be mounted accurately, and it becomes impossible to obtain a stable rotational driving state of the magnetic plate S.

1] Object of the Invention The present invention was proposed in view of the above-mentioned circumstances, and it is proposed that the spring force of the pressing piece that receives the disk drive shaft in the shaft insertion hole of the center core is extremely strong. By making it possible to smoothly insert and insert the drive shaft into the shaft insertion hole at a predetermined position without misaligning the center of rotation of the magnetic disk and the axis of the disk drive shaft, the stability of the magnetic disk is improved. The purpose of this invention is to obtain a rotational drive state that is as follows.

<Summary of the Invention> In order to achieve the above object, a magnetic disk drive device of the present invention provides a shaft insertion hole into which a disk drive shaft is inserted in a center core mounted on the rotational center of a magnetic disk, and a shaft insertion hole into which a disk drive shaft is inserted. A positioning surface is provided in the hole to receive the outer circumferential surface of the drive shaft and align the center of rotation of the magnetic disk with respect to the drive shaft, and the drive shaft is elastically pressed against the positioning surface into the shaft insertion hole. From synthetic resin! A pressing piece is provided so as to be continuous in the axial direction of the shaft insertion hole, and an insertion range of the driving shaft into the shaft insertion hole is set to be equal to or less than the total height of the pressing piece, and the driving shaft is inserted into the shaft insertion hole. The pressing piece is twisted by the insertion, and the axis of the drive shaft is aligned with the rotation center of the magnetic disk in a state where the pressing piece is twisted, and the magnetic disk is rotationally driven. This is a characteristic feature.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 3 is a sectional view of a main part showing a state in which a magnetic sorter is loaded into a magnetic recording device. The magnetic sheet S is rotatably housed in a thin jacket 1 in advance. At the center of rotation of the notebook S, an annular center core 2 made of synthetic resin is attached. Both axial end surfaces 2A and 2E of the core 2 are exposed to the outside through an opening iAIB formed in the jacket 1, as shown in FIG.

The magnetic notebook S is first loaded into a jacket holder 3, and by lowering the holder 3 onto a substrate (not shown) via a hinge, the magnetic notebook S is loaded into a predetermined position within the recording device.

On the substrate, there are provided the magnetic ↑ throat 4, a guide plate 5 for stabilizing the contact state of the magnetic head 4 with the magnetic note SK, and a radial direction (a third A head movement operation unit 6 and the like are provided for automatically and intermittently feeding the head in the direction indicated by the arrow in the figure.

The guide plate 5 has a protrusion 5A that protrudes into the jacket 1 through a rectangular opening 1C for inserting a magnetic head formed in the jacket 1, and a protrusion 5AK that protrudes into the jacket 1.
A window portion 7 for protruding the throat is formed. Above information board 5
A pair of height regulating pins 8, 8 are planted on the top. Each of these pins 8, 8 is provided so as to provide a predetermined distance from a regulating plate 9 provided on the jacket holder 3.

The regulating plate 9 is also provided with a protruding portion 9A that protrudes into the jacket 1 through a rectangular opening 1D that is opened in the jacket 1 opposite to the opening 10. Then, the magnetic head 8 is pressed downward in FIG. 3 by the protrusion 9A, and the magnetic head 4 is placed on the magnetic recording surface Sl.
When the trunk is brought into contact with the trunk, information such as still images can be recorded using the annular trunk. By the intermittent movement of the magnetic head 4, a plurality of pieces of information are recorded on the magnetic recording surface Sl using a plurality of concentric tracks.

By the way, on the other end surface 213 side of the center core 2, an annular positioning member 10 made of a magnetic member such as a metal plate is integrally fixed by outsert molding. The inner circumferential portion of the magnetic recording surface S1 side of the magnetic /-1·S is one end surface 10A of the positioning member 10.
KIur has arrived.

The other end surface 10B of the positioning member 10 is formed parallel to the magnetic recording surface S+ of the magnetic notebook S, and the other end surface iQB projects onto the rotary table 11 provided on the substrate "-". It serves as a position reference surface that is received by the annular positioning rib 12 provided. That is,
When the magnetic note S is received by the upper core 2 or the tip of the rib 12, it can come into stable contact with the magnetic recording surface S1 or the magnetic node 4. On the rotary table 11, an annular magnet 13 is arranged and fixed on the inner peripheral side of the positioning rib 12.

A shaft insertion hole 14 is formed through the center core 2 . A disk drive shaft 15 is fitted into the shaft insertion hole 14 . The drive shaft 15 has a fifth
As shown in the figure, there is a cylindrical rotating shaft 16 that is integrally formed in the center of the rotating table 11, and this rotating shaft 1.
A fixed shaft 18 is formed coaxially with the shaft 16 with a bearing 17 interposed therebetween. The rotary shaft 16 is rotatably driven by a drive motor (not shown) that is connected to the rotary table 14 via a belt 19 wound around the outer periphery of the rotary table 14 .

In the shaft insertion hole 14, as shown in FIG. It is formed so as to be continuous and to form a substantially square shape. The center of rotation of the magnetic sheet S with respect to the rotating shaft 16 is determined using the positioning surfaces 20, 20 as a reference. Further, a U-shaped suppressing piece 21 for elastically pressing the rotating shaft 16 against the positioning surface 20.20 is inserted into the shaft insertion hole 14 at a position facing the positioning surface 20.20. They are integrally formed so as to be continuous in the axial direction of the hole 14. This suppressing piece 21 is formed by forming a U-shaped elongated hole 22 in the axial direction on the side opposite to the suppressing surface 21A that contacts the outer peripheral surface of the rotating shaft 16. In addition,
The suppressing piece 21 is formed at the same time when the core 2 is insert-molded.

By the way, the length of the straight line R' connecting the central part a of the suppressing surface 21 and the rotation center X of the magnetic sheet S is equal to the length of the rotation axis 16
The radius R is set to be shorter than the length of the radius R. Therefore,
When the rotating shaft 16 is inserted into the shaft insertion hole 14, the outer circumferential surface of the rotating shaft 16 can be positioned and elastically pressed to 2'0.2 (J) by the pressing surface 21A of the pressing piece 21. That is, When the magnetic sheet S is loaded into the jacket holder 3 and the holder 3 is laid down on the substrate side, the center core 2 is pulled onto the rotary table 11(t)ll by the attractive force of the magnet 13. Due to the suction force, the rotating shaft 16 is press-fitted into the shaft insertion hole 14 against the spring force of the suppressing piece 21, and the positioning member 10 of the core 2 is received by the positioning lip 12. The magnetic sheet S maintains a relationship in which the magnetic recording surface Sl is perpendicular to the axial direction of the rotating shaft 16 in the magnetic recording device, and the center of rotation of the magnetic sheet S is set to the rotating shaft 16.
It is designed to be positioned so that it coincides with the axis of the

By the way, the accuracy of magnetic seams 1-s as mentioned above,
(In order to obtain the positioning state, the following conditional expression 00 must be satisfied.

That is, the condition under which the positioning member 10 of the center core 2 is received by the positioning lip 12 of the rotary table 11 and the magnetic sheet S is positioned is 3 μmf]<f2・0
In addition, the rotation axis 16 is located on the positioning surface 213 of the center core 2.
, 20 to position the magnetic sheet S.

3.X-t'2f2<f+ In the above equation, fl is the force required to receive the rotating shaft 16 by the pressing piece 21 and the positioning surface 20.20, as shown in FIG.

fzld is the force necessary to insert the rotary shaft 16 into the shaft insertion hole 14 to a predetermined position by the attraction force of the magnet 13, as shown in FIG. μm is the coefficient of friction of the rotating shaft 16 with respect to the shaft insertion hole 14. μ2 is a positioning lip 12 for the positioning member 10 of the center core 2.
is the coefficient of friction in the plane direction.

-1. As shown in FIG. 7, in the above-mentioned magnetic notebook S, the center core 2 has a thickness tl of 24 mm. The thickness t2 of the pressing piece 21 is 0.35 mm. The insertion amount t0 of the rotating shaft 16 into the shaft insertion hole 14 is set to 0.7 mm. The disk member 23 provided at the tip of the fixed shaft 18 protrudes outward from one end surface 2A of the core 2 and comes into contact with the interval adjustment screw 24 screwed onto the regulation plate 9. It has become.

As mentioned above, if the insertion of the rotating shaft 16 into the shaft insertion hole 14 is kept below the thickness t of the core 2, that is, the total height t1 of the suppressing piece 21, then the pressing force b-21 The both ends 21a and 21b (see FIG. 6) of the pressing piece 21 are held as fulcrums, and the upper end 21B of the pressing piece 21 is twisted toward the center of the shaft insertion hole.

In this way, when the pressing piece 21 becomes sagging, the spring constant of the pressing piece 21 becomes smaller.

In other words, if the pressing piece 21 were to be bent in parallel without twisting, the spring constant would be, for example, 175, but the twisting would reduce the spring constant to 13 or less from experimental results. It was done.

Therefore, the attraction force of the magnet 13 is weak and the pressing piece 21
Even if the spring force is strong (^^), the rotation center of the seat S and the axis of the rotation shaft 16 should smoothly fit into the shaft insertion hole 14 without shifting the center of rotation of the seat S and the axis of the rotation shaft 16. Therefore, the attachment state of the magnetic notebook S to the disk drive shaft 15 becomes stable.
The magnetic sheet S can be rotationally driven in a stable state.

In addition, since the spring constant of the pressing piece 21 can be made small, the amount of deflection of the pressing piece 21 can be increased. Therefore, high precision is required for the pressing surface 21A of the pressing piece 21. The pressing piece 21 can be easily manufactured (formed) in one step.

The disk and drive shaft according to the present invention may have a configuration as shown in FIG. Note that the structure of this embodiment is the same as that of the previous embodiment, so the explanation will be omitted. That is, the tip of the rotating shaft ÷ is the tapered shaft portion 31. Then, the rotating shaft 30
The insertion range into the shaft insertion hole 14 is such that the total height of the suppression piece 21 is 0.
It is set to 4 or less. Note that the taper angle 2 of the tapered shaft portion 31 is approximately P to 5 degrees.

0 Even in the case where the tapered shaft portion 31 is provided at the tip of the rotating shaft, the pressing piece 21 has an upper end 21 B (fill force! 14 is twisted so as to be inclined toward the center of the shaft 14, and the insertion of the rotating shaft 30 into the shaft insertion hole 14 becomes smooth.
In the case where the tapered shaft portion 31 is provided, the outer periphery of the shaft portion 31 is in surface contact with the positioning surface 20.20 of the shaft insertion hole 14 and the pressing surface 21'A of the pressing piece 21. Since the rotating shaft 30 is inserted into the shaft insertion hole 14, the rotating shaft 16 can be inserted more smoothly. Note that the rotating shaft 16 is inserted into the shaft insertion hole 14.
When the straight shaft portion 32 of the rotary shaft 16 is connected to the tapered shaft portion 31, the straight shaft portion 32 is received by the positioning surfaces 20, 20 and the suppressing surface 21.

Insertion amount t2 of the straight shaft portion 32 into the shaft insertion hole 14
is approximately 0.2 mm. In this way, by fitting the straight shaft portion 32 into the shaft insertion hole 14 to some extent, it is possible to ensure that the center of rotation of the magnetic head 1-S coincides with the axis of the rotating shaft 30.

B.The present invention is also applicable to a magnetic reproducing device for reproducing information magnetically recorded on a magnetic disk, and is also applicable to a magnetic recording/reproducing device for recording information and reproducing the information. This also applies to

<Effects of the Invention> As described above, according to the present invention, when the disk drive shaft is inserted into the shaft insertion hole provided in the center core of the magnetic disk, the drive IQI+ is received in the shaft insertion hole and nucleated 1.
It is possible to cause the suppression piece that elastically presses against the positioning surface provided on the other side to return by one position. ”-If the pressing piece is twisted, the spring constant of the pressing piece can be reduced. Therefore, even if the spring force of the suppressing piece is large, the rotation center of the magnetic disk and the axis of the disk drive shaft will not deviate, and the The drive shaft can be smoothly inserted to a predetermined position, and a stable rotational driving state of the magnetic disk can be obtained.

In fact, since the spring constant of the suppression piece can be made small, the amount of deflection of the suppression piece can be increased. Therefore, high precision is not required for the drive shaft suppressing surface of the suppressing piece, and the suppressing piece can be manufactured (formed) easily.

[Brief explanation of drawings]

Fig. 1 is an exploded sectional view of the main part showing a conventional example, Fig. 2 is an enlarged sectional view of the main part showing a state in which the uf disk drive shaft is inserted into the shaft insertion hole of the center core, and Fig. 3 is an exploded sectional view of the main part showing a state in which the uf disk drive shaft is inserted into the shaft insertion hole of the center core. 4 is an enlarged sectional view of the main part of the magnetic sheet portion, FIG. 5 is an enlarged sectional view of the disk drive shaft, FIG. 6 is an enlarged plan view of the center core, and FIG. 7 is a sectional view of the main part showing the embodiment. 8 is an enlarged sectional view of the main part showing a state in which the disk drive shaft is inserted into the shaft insertion hole of the center core, and FIG. 8 is an enlarged sectional view of the main part showing another embodiment of the present invention. 2. Center core 14...Axle insertion hole 20.20...Positioning surface 21...Press piece S...Magnetic notebook patent applicant Sony Corporation representative Patent Attorney Kodo Koike 1) Sakae Mura -

Claims (1)

[Claims] A shaft insertion hole into which the disk external drive shaft is inserted is provided in the center core attached to the rotational center of the magnetic disk, and the shaft insertion hole receives the outer circumferential surface of the drive shaft, and the magnetic disk is inserted into the center core attached to the rotation center of the magnetic disk. A positioning surface for aligning the centers of rotation is provided, and a suppressing piece made of synthetic resin for elastically pressing the drive shaft against the positioning surface is provided in the shaft insertion hole so as to be continuous in the axial direction of the shaft insertion hole. The insertion range of the drive shaft into the shaft insertion hole is set to 1/2 or less of the total height of the pressing piece, and by fitting the driving shaft into the shaft insertion hole, the pressing piece is twisted, and the pressing piece is twisted. A magnetic disk drive device characterized in that the magnetic disk is rotationally driven by aligning rlQ of the magnetic disk with the axis of the drive shaft during rotation of the magnetic disk in a twisted state.