JPS63220455A - Rotary riving device for recording and reproducing disk - Google Patents

Abstract

PURPOSE:To exactly and rapidly perform chucking (fixing), by providing a pair of elongated holes inclined to first reference line and formed in axial symmetry to second reference line on a disk, and providing eccentric pins corresponding to the holes respectively on a disk table by fixing them. CONSTITUTION:By loading the disk 1 on the disk table 15 and inserting a central hole 7 to a center pin 16 in a state where the disk table 15 is rotated in a direction of arrow head (a), the eccentric pins 17 are inserted into the elongated holes 8a and 8b during the half revolution of the disk. And a center core 6 is attracted horizontally on the upper plane 15a of the disk table 15 by the attracting force of a magnet 18 which attracts a magnetic member 10. The eccentric pins 17 are pressed on an inclined plane 9a or 9b by a cleating function, however, since both elongated holes are formed in the axial symmetry, the center O1 of the disk 1 is positioned in the center O3 of the center pin 16 by a component in a direction of arrow head (b) even when they are pressed on either inclined plane 9a or 9b. In such a way,it is possible to position the disk on the disk table exactly and to perform the chucking rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotational drive device for rotationally driving a recording/reproducing disk such as a magnetic disk or an optical disk.

[Summary of the invention]

This invention provides a recording/reproducing system in which a center hole and an eccentric hole of a recording/reproducing disk are respectively inserted into a center pin and an eccentric pin on a disk table rotationally driven by a motor, and the disk is rotationally driven by this disk table. In the rotary drive device for a disc, by configuring the eccentric hole as a pair of elongated holes inclined with respect to the tangent to the outer circumference of the disc, the eccentric pin on the disc table can be configured with a fixed pin, and This allows the disc to be quickly chucked (fixed) on the disc table.

[Conventional technology]

Traditionally, as a rotation drive device for floppy disks,
For example, Japanese Patent Application Laid-Open No. 57-36473 is known.

In this known example, the center hole and the eccentric hole provided in the center core of the floppy disk are constituted by a square hole and a rectangular long hole parallel to the tangent to the disk's outer periphery. Of the center pin and eccentric pin provided on the disk table, the eccentric pin is supported by a leaf spring or the like to urge it to move toward the outer circumference of the disk. Then, with the center hole and eccentric hole of the center core inserted into the center pin and eccentric pin on the disk table, respectively, the disk table is rotated by a motor, and the eccentric pin is moved by the spring force of a leaf spring or the like. It is elastically pressed against the surface of the eccentric hole on the disk outer circumferential side and is brought into contact with the surface of the eccentric hole on the disk rotation direction side. As a result, the center of the floppy disk is positioned at the center of the disk table by pressing the two mutually perpendicular surfaces of the center hole against the two points on the outer peripheral surface of the center pin by the repulsive force of the leaf spring or the like. , the disk is rotated by a disk table.

[Problem that the invention seeks to solve]

However, in this known example, in order to force the eccentric pin of the disc table to move toward the outer circumference of the disc, the eccentric pin must be supported by a leaf spring or the like, which makes the structure of the disc table extremely complicated. There was a problem with high costs.

In addition, since there was only one eccentric hole, the eccentric pin was pressed against the surface of the disk outer circumferential side of the eccentric hole, and the maximum amount of time required before the disk was accurately positioned and chucked (fixed) on the disk table. , it took approximately one rotation of the eccentric pin, and quick chucking could not be performed.

This invention was invented to solve these problems, and although the disk can be accurately positioned and chucked on the disk table, the structure of the disk table is very simple. Yes, and chucking (fixing) the disc on the disc table.
It is an object of the present invention to provide a rotational drive device for a recording/reproducing disk that can quickly perform the following steps.

[Means for solving problems]

The rotational drive device for a recording/reproducing disk of the present invention has a first reference line on both sides of the center hole of the recording/reproducing disk, which is inclined with respect to a first reference line parallel to a tangent to the outer circumference of the disk, and extends in a linear direction through the center of the disk. A pair of elongated holes are provided which are line symmetrical with respect to a second reference line extending in the direction, and a center pin and an eccentric pin are each fixedly provided on a disk table rotationally driven by a motor, and the disk is mounted on the disk table. by inserting the center hole and one of the elongated holes into the center pin and the eccentric pin, respectively, and in this state, by rotating the disk table in one direction with a motor, the eccentric pin can be inserted into either one of the holes. The disk is rotated by being pressed against the inclined surface of the elongated hole on either the disk outer circumferential side or the disk center side by a wedge action.

[Effect]

According to the rotary drive device for a recording/reproducing disk of the present invention, since the pair of long holes provided in the disk are line symmetrical with respect to the second reference line, the eccentric pin can be inserted into either of the long holes. Even when the disc is inserted into the disc table, the wedge action between the eccentric pin and the inclined surfaces of these long holes allows the disc to be accurately positioned and chucked on the disc table.

Moreover, since the eccentric pin is inserted into one of the elongated holes while the eccentric pin rotates at most half a rotation, chaffing of the disk on the disk table can be quickly performed. However, the eccentric pin only needs to be a pin of an extremely simple structure that is fixed to the disk table, and there is no need to support this eccentric pin with a temporary spring or the like as in the previously mentioned known example.

〔Example〕 Embodiments of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 3 and FIG. Two annular magnetic sheets 3 are pasted in parallel on the top and bottom of a shaped substrate 2, with initial tension applied to each. Double inner and outer annular portion 4a integrally formed with
, 4b by adhesive or the like, and a gap 5 is provided between both the magnetic sheets 3 and the substrate 2 between the annular portions 4a and 4b.

A center core 6 molded from synthetic resin is integrally provided at the center of the substrate 6 by outsert molding or the like, and the center core 6 is slightly eccentric with respect to the center O1 of the disk l. A circular center hole 7 having a center 02 is vertically penetrated. Further, on both sides of the center hole 7 of the center core 6, a disk outer periphery 1a is provided.
is inclined at a predetermined angle θ with respect to a first reference line P parallel to a tangent P0 of the disk 1, and is inclined at a predetermined angle θ with respect to a first reference line P parallel to a tangent P0 of the disk 1. A pair of elongated holes 8a and 8b are provided that are symmetrical with respect to a second reference line P2 that extends diametrically through the second reference line P2. However, both elongated holes 8a and 8b are twisted on a third reference line P3 that passes through the center 01 of the disk l and is perpendicular to the second reference line P. An inclined surface 9a of one elongated hole 8a on the disk outer circumferential side and an inclined surface 9b of the other elongated hole 8b on the disk center side serve as operating surfaces during chucking, which will be described later.

A magnetic member lO such as a stainless steel plate is integrally provided on the lower surface of the center core 6 by outsert molding or the like, and a small protrusion 10a integrated with the magnetic member lO is arranged directly below the second reference line Pt.

FIG. 4 shows an embodiment in which the disc 1 is stored and used in a cartridge 12, and the lower surface of this cartridge 12 has a disc table insertion hole 13 and a pair of upper and lower head insertion holes (not shown). etc. are provided, and these are configured to be opened and closed by a shutter (not shown).

Next, as shown in FIGS. 1 and 2, a cylindrical center pin 16 and an eccentric pin 17 are fixedly provided on the upper surface lsa of the disk table 15 that rotationally drives the disk 1. . Further, a magnet 1-18 is attached to the disc table 15 at a position slightly lower than the upper surface 15a. The disk table 15 rotates a spindle shaft 19 integrated with the center pin 16 at a predetermined number of rotations (for example, 3.60 rpm) in the direction of arrow a by a motor 20.
The motor 20 is fixed to a mechanical chassis 21 with screws 22 or the like.

A phase detector 23 such as a PC coil is mounted on the motor 20 or the mechanical chassis 21 to detect the phase of the disk 1 using the small protrusion 10a of the magnetic member 10 of the disk I.

Next, according to FIGS. 1 and 2, the disk table 1
The operation of mounting the disk l onto the disk 5 will be explained.

While the disk table 15 is being rotated by the motor 20 in the direction of arrow a at a speed of, for example, 3.600 rpm,
The disk 1 is mounted horizontally on the disk table 15, the center hole 7 is inserted into the center pin 16, and the eccentric pin 17 is inserted into one of the elongated holes 8a or 8b as shown by solid lines or chain lines in FIG. have it inserted.

At this time, the eccentric pin 17 is quickly inserted into the elongated holes 8a and 8b while the eccentric pin 17 is rotated approximately half a turn at the maximum, and the center core is attracted by the attraction force of the magnet 18 that attracts the magnetic member 10. 6 is quickly horizontally attracted onto the upper surface 15a of the disk table 15.

At this time, the attraction force by the magnet 18 is
Since the rotational driving force of the disk 10 is set to be weaker than that of the disk 10, the eccentric pin 17 allows the disk 1 to slide on the upper surface 15a of the disk table 15.

Thus, the eccentric pin 1 inserted into the elongated hole 8a or 8b
7 is pressed against these inclined surfaces 9a or 9b by a wedge action. At this time, since both the elongated holes 8a and 8b are formed line-symmetrically as described above, no matter which inclined surface 9a or 9b the eccentric pin 17 is pressed against, the component force generated by these pressing forces will be This occurs on or near the third reference line P3 in the direction indicated by the arrow in FIG.

Then, the part 7a of the center hole 7 is pressed against the part 16a of the center pin 16 in the direction indicated by the arrow by the component force in the direction indicated by the arrow, so that the center OI of the disk 1 is accurately aligned with the center O1 of the center pin 16. In addition to being positioned, the contact pressure between the eccentric pin 17 and the inclined surface 9a or 9b, and the contact pressure between the center hole 7 and the center pin 1
The disk 1 is accurately positioned on the disk table 15 at a predetermined position (position in the rotation direction of the disk table 15) where the contact pressure with the disk 6 is balanced, and the disk 1 is chucked (fixed) on the disk table 15. ) to be done. Then, the disk 1 is rotated integrally with the disk table 15 at, for example, 3.60 rpm in the direction of arrow a.

In short, the disk 1 is accurately positioned on the disk table 15 and chuffed while the eccentric pin 17 is rotated by about half a rotation at most.

On the other hand, a pair of upper and lower magnetic sheets 3 of the disk 1 are recorded and reproduced by a pair of upper and lower magnetic heads (not shown) that are brought into contact with these and scanned in the radial direction. By providing the phase detector 23 that detects the phase of the disk 1 using the protrusion 10a, in conjunction with the accurate positioning of the disk 1 on the disk table 15 described above, recording and reproduction by the magnetic head of the magnetic sheet 3 is possible. can always be started accurately at a predetermined track position and from a predetermined phase position.

Therefore, even on the removable disk 1, high-density recording of, for example, 8007PI or more is possible, and the compatibility and reliability are extremely high.

Incidentally, FIG. 5 shows a modification in which a PC magnet 25 is attached to the center core 6 for detecting the phase of the disk 1 by the phase detector 23.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the invention.

Furthermore, the present invention is not limited to the SSR disks shown in the embodiments, but is applicable to recording and reproducing disks of various recording and reproducing methods, such as various magnetic disks and various optical disks.

〔Effect of the invention〕

As described above, the recording/reproducing disk rotation drive device of the present invention can accurately position and chuck the disk on the disk table, so it is particularly possible to perform high-density recording on removable disks. It has very high compatibility and reliability.

Furthermore, there is no need to support the eccentric pin of the disc table with a leaf spring or the like, and the structure of the disc table can be significantly simplified, resulting in a significant cost reduction. Furthermore, since the eccentric pin may simply be fixedly provided on the disk table, durability and reliability are significantly improved.

However, the eccentric pin of the disc table is at maximum
The disk can be quickly chucked onto the disk table during approximately half a rotation, and the chucking time is 1/2 that of the above-mentioned known example, and the disk can be quickly replaced in a disk autochanger or the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view of the main part, Fig. 2 is a sectional view taken along arrow nn in Fig. 1, and Fig. 3 is a plan view of the disk. 4 are sectional views of the disk cartridge, and FIG. 5 is a sectional view showing a modified example. In addition, in the symbols used in the drawings,

Claims (1)

[Scope of Claims] Second reference lines are provided on both sides of the center hole of the recording/reproducing disk, and are inclined with respect to the first reference line parallel to the tangent to the outer periphery of the disk, and extend in a straight line through the center of the disk. A pair of elongated holes are provided which are line symmetrical with respect to each other, a center pin and an eccentric pin are each fixedly provided on a disk table rotationally driven by a motor, and the disk is mounted on the disk table and the center hole is opened. Insert one of the elongated holes into the center pin and the eccentric pin, and in this state, drive the disk table to rotate in one direction with a motor, thereby inserting the eccentric pin into the outer peripheral side of the disk in one of the elongated holes. Or a rotational drive device for a recording/reproducing disk configured to rotate the disk by pressing one of the inclined surfaces on the center side of the disk in a wedge action.