JP2698620B2 - Recording or playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording or reproducing apparatus for recording or reproducing information by rotating a rotary recording medium with a drive motor.

2. Description of the Related Art As this type of device, there is a floppy disk drive (hereinafter abbreviated as FDD) for magnetically recording or reproducing information on a floppy disk of a rotating magnetic recording medium. The FDD is provided with a disk drive motor (hereinafter abbreviated as a DD motor) for rotating the disk, and a chucking mechanism for holding the disk and transmitting the rotational driving force of the DD motor to the disk. In a conventional FDD, a disc-shaped spindle hub is fixed to the tip of a spindle which is an output rotation shaft of a DD motor, and a chucking mechanism is provided on the spindle hub based on the hub. The disk is held on a spindle hub, the disk is driven to rotate by a DD motor, and a magnetic head is brought into sliding contact with the disk to perform recording and reproduction.

[Problems to be Solved by the Invention] By the way, recent FDDs are required to be further reduced in size and thickness by being incorporated in portable personal computers and word processors.

However, in the conventional FDD, since the spindle hub is provided on the DD motor and the chucking mechanism is provided on the hub as described above, the rotation drive unit including the DD motor and the chucking mechanism, which are main parts of the FDD mechanism, is provided. It is difficult to keep the overall height low, which is a major obstacle to reducing the overall thickness of the FDD.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording / reproducing apparatus that records or reproduces information by rotating a rotary recording medium by a drive motor without being limited to the FDD, and to provide a structure that can be made thinner.

[Means for Solving the Problems] According to the present invention, there is provided a drive motor for driving a recording medium to rotate, holding the medium, and transmitting a rotational driving force of the drive motor to the medium. A chuck provided with a chucking mechanism, wherein the motor includes: a rotor yoke fixed to a rotating shaft; a magnet for rotational driving provided on an inner surface of the rotor yoke; and a coil arranged on a substrate facing the magnet. The chucking mechanism includes: a holding member that holds the medium provided on an outer surface of the rotor yoke; and a holding member that protrudes from the rotor yoke and passes through an opening formed in the rotor yoke. An engagement member for engaging and transmitting a rotational driving force of the drive motor; and an engagement member disposed inside the inner diameter of the magnet and partially locked to the rotor yoke. A support member for supporting the joining member, wherein the support member is provided so as to be movable in the axial direction of the rotating shaft in a space inside the inner diameter of the magnet and a space surrounded by the coil. The configuration of the recording or reproducing apparatus is adopted.

[Operation] According to such a configuration, the holding member that holds the recording medium of the chucking mechanism is provided on the outer surface of the rotor yoke, and supports the engaging member that transmits the rotational driving force to the recording medium of the chucking mechanism. Since the support member is mounted on the inner surface of the rotor yoke, the chucking mechanism is integrally formed with the drive motor using the rotor yoke as a mounting base. In addition, the space inside the rotating drive magnet fixed to the rotor yoke and the space surrounded by the coil opposed to the magnet are fixed to the rotor yoke, which has been an empty space. Since the space is effectively used as a space, the height of the entire rotary drive unit including the drive motor and the chucking mechanism can be significantly reduced, and the recording or reproducing apparatus can be made thin.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

First Embodiment FIGS. 1 to 4 illustrate the structure of a disk rotation drive unit including a DD motor and a chucking mechanism as a main part of an FDD according to a first embodiment of the present invention.

The structure of the floppy disk will be briefly described before the rotation drive unit. In FIG. 1, which shows a longitudinal section of the whole rotation drive unit of the FDD, reference numeral 18 denotes a disk cassette of a floppy disk, in which a medium 19 made of a circular magnetic sheet is rotatably accommodated. At the center of the media 19, a hub 20 made of an iron plate or the like is fixed. The hub 20 has a hole 20a for fitting a spindle 6 described later.

Next, the structure of the rotation drive unit will be described. In FIG. 1, reference numeral 1 denotes a chassis for supporting each component of the FDD. The chassis 1 is formed from a magnetic material such as an iron plate. Using the chassis 1 as a stator yoke,
A DD motor is constituted by the following members denoted by reference numerals 11 to 11.

First, an FPC (flexible printed circuit board) 2 provided with a DD motor drive control circuit (not shown) is fixed on the chassis 1. Not only FPC but also a thin glass epoxy substrate may be used. The coil 3 of the DD motor is fixed on the FPC 2.
On the coil 3, a pattern 4 constituting a frequency generator that generates a pulse signal having a frequency corresponding to the rotation speed of the DD motor
Is fixed.

On the other hand, a sliding bearing 5 is fitted to the center of the portion of the chassis 1 where the DD motor is provided, and is fixed by press fitting or the like. A spindle 6, which is an output rotating shaft of the DD motor, is slidably and rotatably fitted to the sliding bearing 5. A screw 7 for retaining the screw is screwed into the end of the spindle 6 on the chassis 1 side.
Is prevented from coming off in the upward direction in the figure toward the mounting side of the disk cassette 18.

Next, a disk-shaped bush 8 is fixed to the upper part of the spindle 6, and a rotor yoke 9 formed of a cylindrical iron plate or the like as shown in FIG. It is fixed. The bush portion may be manufactured integrally with the rotor yoke. A magnet 10 is fixed to the lower surface of the rotor yoke 9 and is arranged to face the coil 3 via an air gap AG. FIG. 2 shows a longitudinal section of only the rotor yoke 9 part.

In the DD motor composed of the above members, the spindle 6 and the weight of the member supported by the spindle 6 and the magnet
10. A thrust load is applied to the spindle 6 downward in FIG. Here, the thrust load is received on the upper surface of the slide bearing 5. In order to reduce the rotational load of the DD motor due to the thrust load, a thrust washer 11 made of Teflon or the like having a small friction coefficient is interposed between the upper surface of the slide bearing 5 and the lower surface of the bush 8 opposed thereto.

In the DD motor having the above-described structure, by energizing the coil 3 in a predetermined timing pattern, the rotor yoke 9 is rotated together with the bush 8 and the spindle 6 by the magnetic force acting between the coil 3 and the magnet 10. . With this rotation, the hub 20 of the medium 19 in the disk cassette 18 is rotated, and the medium 19 is driven to rotate.

Next, the structure of the chucking mechanism that holds the hub 20 of the medium 19 on the DD motor and transmits the rotational driving force of the DD motor to the hub 20 will be described.

The chucking mechanism is composed of the following members indicated by reference numerals 12 to 17 and 31 in FIG.
It is attached to the lower surface (inner surface) and the upper surface (outer surface) of the rotor yoke 9 of the motor.

First, reference numeral 12 denotes a drive pin that engages with the hub 20 to transmit the rotational drive force of the DD motor, and is rotatably provided on the right end of the support plate 14 by a shaft 13 in the drawing.

In this embodiment, the support plate 14 is made of a plastic magnet, that is, a magnet magnetized with plastic filled with magnetic powder, and one side is cut into a substantially triangular shape as shown in FIG. It is formed in the shape of a missing circular ring.

The support plate 14 is provided on the end of the support plate 14 opposite to the drive pin 12.
A shaft 15 for attaching the shaft to the rotor yoke 9 is implanted. The shaft 15 has a ball-shaped hole 9a formed in the rotor yoke 9 and a similar hole 17a formed in an attraction magnet 17 described later.
The flange formed at the upper end of the shaft 15 can engage with the edge of the narrow portion of the hole 17a.

The shaft 15 is pressed by bosses 9b, 9b formed near both sides of the hole 9a on the lower surface of the rotor yoke 9 and a wire spring 16 stretched between the shaft 15 as shown in FIG. It is always urged in the direction A in FIG. Due to this bias, the shaft 15 is displaced toward the narrow portion of the holes 9a and 17a,
The upper end of the flange engages with the edge of the hole 17a, whereby the shaft 15 is attached to the rotor yoke 9, and the support plate 14 is rotatable in the vertical direction in FIG. It can be attached.

The support plate 14 made of a plastic magnet is urged in the upward direction in FIG. 1 by its own magnetic force to attract the rotor yoke 9 made of a magnetic material. This allows the drive pin
Numeral 12 is urged to protrude above the rotor yoke 9 as shown by an arrow B in FIG. 1 through a hole 9c formed in the rotor yoke 9 and a hole 17c formed in the attracting magnet 17.

On the other hand, on the upper surface of the rotor yoke 9,
An attracting magnet 17 for adsorbing and holding the hub 20 is provided. The attracting magnet 17 is formed as a plastic magnet, is formed in a circular ring plate shape as shown in FIG. 3, and is disposed at the center of the rotor yoke 9 so as to surround the bush 8. The attracting magnet 17 has holes 17a and 17c through which the shaft 15 and the drive pin 12 described above are inserted. The periphery of the hole 17a is a recess 17b,
The upper end of the shaft 15 does not protrude above the upper surface of the attracting magnet 17 that attracts the hub 20. The attracting magnet 17 is integrally fixed to the rotor yoke 9 by bonding or the like.

Further, a circular ring-shaped Teflon washer 31 having a small friction coefficient is provided on the bush 8 inside the attracting magnet 17 so that the rotor yoke 9 side can easily idle with respect to the hub 20 at the time of chucking described later. .

Next, the chucking operation of the chucking mechanism having the above configuration will be described. At the time of chucking, first, the disc cassette 18 is loaded on the rotor yoke 9 by a cassette loading mechanism (not shown), the center hole 20a of the hub 20 is fitted into the spindle 6, and the hub 20 is moved by the magnetic force of the attraction magnet 17 to the Teflon washer 18 Absorbed and held on. At this time, the drive pin 12 is pressed down by the hub 20 which is attracted, and is pushed down below the position shown in the figure against the urging force in the direction B in FIG.

At the same time, the DD motor is driven by energizing the coil 3, and the rotor yoke 9 rotates together with the bush 8 and the spindle 6. Drive pin 12 is hub with rotor yoke 9
When the drive pin 12 slips with respect to the lower surface of the base 20 and the position of the drive pin 12 comes to the engagement hole 20b of the hub 20, the drive pin 12 is fitted into the hole 20b in the direction B by the biasing of the support plate 14 described above. . Then, the drive pin 12 is engaged with the edge of the hole 20b by the urging of the wire spring 16 in the direction A shown in FIG. That is, the drive pin 12 is
, The rotational driving force of the DD motor is transmitted to the hub 20 via the drive pin 12, the hub 20 is rotationally driven, and the medium 19 is rotated.
Is driven to rotate. Then, a magnetic head (not shown) is brought into sliding contact with the rotatably driven medium 19 to perform recording and reproduction.

According to the FDD of the present embodiment as described above, D
An attracting magnet 17 is mounted integrally with the rotor yoke 9 on the upper surface of the rotor yoke 9 of the D motor, and a support plate 14 of a driving pin 12 for transmitting a rotational driving force is mounted on the lower surface side of the rotor yoke 9 to provide a chucking mechanism. Since it is integrally formed with the DD motor based on the rotor yoke 9, it is composed of a DD motor and a chucking mechanism as compared with a conventional case where a spindle hub is provided above the DD motor and a chucking mechanism is formed based on the spindle hub. The overall height of the rotary drive can be significantly reduced, and the overall FDD can be made thinner.

Further, according to this embodiment, the spindle 6 is supported by the slide bearing 5, and it is extremely easy to use a short slide bearing and make the height lower than that of a ball bearing. By lowering the thickness, the overall thickness of the DD motor can be reduced, and from this point also the overall thickness of the FDD can be reduced.

Further, according to the present embodiment, the spindle hub conventionally used is eliminated, so that the number of parts can be reduced correspondingly, and the cost of the FDD can be reduced.

In the structure described above, the biasing of the drive pin 12 in the direction B is performed by the magnetic force of the support plate 14. However, the biasing is not limited to the method using the magnetic force, and other methods such as a spring are used. Is also good. Also, other methods may be employed for holding the disk without depending on the magnetic force. In short, regardless of the type of chucking mechanism, the chucking mechanism is attached to the rotor yoke of the DD motor, and the chucking mechanism is integrated with the DD motor based on the rotor yoke to reduce the overall thickness of the FDD. I can do it.

Second Embodiment Next, FIGS. 5 to 7 show an FD according to a second embodiment of the present invention.
4 explains the structure of the rotation drive section D. In these drawings, common members to those in FIGS. 1 to 4 of the first embodiment are denoted by common reference numerals, and description thereof will be omitted. The same applies to FIG. 8 and subsequent figures of a third embodiment described later.

The second embodiment shown in FIGS. 5 to 7 differs from the first embodiment in that a magnet denoted by reference numeral 21 is provided integrally with the rotor yoke 9 so as to be embedded in the center of the rotor yoke 9. The magnet 21 is made of a plastic magnet, is formed in a disk shape, and the spindle 6 is inserted through the center thereof and fixed. The magnet 21 is formed integrally with the rotor yoke 9 by, for example, insert molding. At the time of insert molding, the spindle 6 may be molded together. But magnet
The method of providing 21 is not limited to insert molding, but may be bonding or caulking.

In this embodiment, the support plate 22 for supporting the drive pins 12 is not made of a magnet but made of a magnetic material such as a non-magnetized iron plate.

With such a structure, in the present embodiment, the hub 20 of the medium 19 is attracted and held by the magnet 21 during chucking, and the support plate 22 is attracted by the magnet 21 to chuck the drive pin 12.
In the B direction.

According to such a structure, the thickness of the FDD can be reduced similarly to the first embodiment, and the suction of the hub 20 for chucking and the biasing of the drive pin 12 can be performed by one magnet 21, and the structure is improved. In addition to being simpler, the magnet 21 also serves as the bush 8 of the first embodiment, so that the number of parts can be further reduced as compared with the case of the first embodiment, and the cost can be reduced.

Third Embodiment Next, FIGS. 8 and 9 show an FD according to a third embodiment of the present invention.
3 shows the structure of the rotation drive section D.

In this embodiment, a receiving structure for receiving a thrust load applied downward to the spindle 6 and a spindle 6
Is different from those of the first and second embodiments in that the retaining structure for preventing the sliding from coming off the sliding bearing 5 upward in the drawing.

That is, in this embodiment, as shown in FIG. 8, a disk-shaped receiving member 25 having a concave portion 25a is fitted into the chassis 1 and fixed by press fitting or the like, as shown in FIG. The concave shape of the receiving member 25 may be formed in the chassis 1. The sliding bearing 5 is fitted into the concave portion 25a of the receiving member 25, and is fixed by press fitting or the like. A thrust washer 24 formed in a circular sheet shape from Teflon or the like having a low friction coefficient is provided on the center of the bottom surface of the receiving member 25 inside the slide bearing 5. Further, a substantially conical concave portion 6a is formed on the lower end surface of the spindle 6.

The ball 23 is fitted into the recess 6a, makes point contact with the thrust washer 24, and receives the downward thrust load of the spindle 6 via the thrust washer 24.
25.

Since such a structure is provided, the thrust washer 11 provided between the slide bearing 5 and the bush 8 in the first and second embodiments is abolished, and the slide bearing 5 and the bush 8 face each other via the air gap AG. It is supposed to.

On the other hand, in order to prevent the spindle 6 from falling off, a stopper fitting bent at a crank shape indicated by reference numeral 26 is provided. The retainer 26 is fixed on the chassis 1 with a screw 27 so that the tip of the retainer 26 faces the outer peripheral edge of the upper surface of the rotor yoke 9 with a slight gap.

The arrangement of the stopper 26 is, for example, as shown in FIG. 9, and the IO of the carriage 29 for transferring the magnetic head 30 is set.
The rotor yoke 9 is provided at, for example, three places at an angle that substantially divides the outer periphery of the rotor yoke 9 while avoiding the movement region in the direction. Of course 3
It is not limited to the location.

With such a structure, even if the spindle 6 is displaced upward due to an impact or the like, the rotor yoke 9 comes into contact with the distal end of the stopper metal fitting 26, and the spindle 6 is prevented from coming off. That is, the upward movement of the spindle 6 is restricted within the predetermined range via the retaining fitting 26, and stable rotation is obtained. By arranging the stoppers as shown in FIG. 9, the stoppers can be stably regulated.

According to the structure of this embodiment, the downward thrust load of the spindle 6 is received by the point of contact with the receiving surface of the thrust washer 24 via the ball 23, so that the thrust load is received by surface contact. The rotational load of the DD motor due to the thrust load is much smaller than in the first and second embodiments, the medium 19 can be rotated smoothly, and the power consumption of the DD motor can be reduced.

The structure for receiving the thrust load of the spindle 6 by point contact may be as shown in FIG. In the case of FIG. 10, a hemispherical convex portion 6b is formed on the lower end surface of the spindle 6, and this convex portion is formed.
6b is brought into point contact with the thrust washer 24 to receive a thrust load. With such a structure, the same operation and effect as in the case of FIG. 8 can be obtained.

Also, the structure for preventing the spindle 6 from coming off is not limited to those shown in FIGS. 8 and 9, and for example, the structures shown in FIGS. 11 to 13 can be adopted.

In the case of FIGS. 11 to 13, a wire spring bent in a substantially U-shape
Use 28 to secure it. The spindle 6
The bush 8 fixed to the sliding bearing 5 has a cylindrical shape so as to cover the upper part of the slide bearing 5, and has linear grooves 8a, 8a formed on the outer periphery of the lower end thereof, and a wire spring 28 is formed in the grooves 8a, 8a. Be fitted.

The outer periphery of the upper end of the slide bearing 5 is formed as an inclined tapered portion 5a, and a groove 5b is formed in a portion of the outer periphery of the slide bearing 5 facing the groove 8a of the bush 8. Wire spring 28
The groove 5b is formed on the entire outer periphery of the slide bearing because the shaft rotates together with the bush 8. The vertical width of the groove 5b is 28.
Is larger than the width of the groove 8a corresponding to.

With such a structure, the wire spring 28 is fitted into the groove 8a of the bush 8, the spindle 6 is fitted into the slide bearing 5, and the bush 8
Of the wire spring 28 from above
Is pushed down by the tapered portion 5a of the slide bearing 5 and descends, enters the groove 5b, and returns to the original shape. That is,
As shown in FIG. 11, the wire spring 28 is loosely fitted in the groove 5b with a gap between the top and bottom and inside. That is, the interval between the opposing portions of the wire spring 28 is regulated by the groove 8a of the bush 8, and the sliding bearing 5
Of the groove 5b is set smaller than that.

When the spindle 6 is displaced upward in such a structure,
Along with this, the upwardly displaced wire spring 28 comes into contact with the upper inner side surface of the groove 5b in FIG. 11, thereby preventing the spindle 6 from further displacing upward.

With such a structure, the spindle 6 can be prevented from coming off similarly to the case of FIG. 8, and the same operation and effect can be obtained.

[Effects of the Invention] As is apparent from the above description, according to the present invention, in a recording or reproducing apparatus, a drive motor for rotating and driving a recording medium, and a drive for holding the medium and rotating the drive motor on the medium A chucking mechanism for transmitting a force, wherein the motor is disposed on a substrate opposed to the magnet, and a rotor yoke fixed to a rotating shaft, a magnet for rotational driving provided on an inner surface of the rotor yoke. The chucking mechanism is disposed so as to protrude from the rotor yoke through an opening formed in the rotor yoke and a holding member for holding the medium provided on an outer surface of the rotor yoke. An engagement member for engaging with the medium and transmitting the rotational driving force of the drive motor; and an engagement member disposed inside the inner diameter of the magnet, a part of which is engaged with the rotor yoke. And a supporting member for supporting the engaging member, wherein the supporting member is disposed in a space inside the inner diameter of the magnet and in a space surrounded by the coil, and in an axial direction of the rotating shaft. The chucking mechanism is configured integrally with the drive motor, and is disposed opposite to the space inside the magnet and the magnet on the inner surface of the rotor yoke, which was previously an empty space. Since the space surrounded by the coils is used effectively, the overall height of the rotary drive unit consisting of the drive motor and the chucking mechanism can be significantly lower than before, making it possible to reduce the thickness of the recording or playback device and reduce the number of parts. An excellent effect of reducing costs and reducing costs can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the structure of a disk rotation drive unit of an FDD according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a rotor yoke part in FIG. 1, and FIGS. FIG. 5 is a longitudinal sectional view of the rotary drive unit according to the second embodiment, FIG. 6 is a longitudinal sectional view of the rotor yoke in FIG. 5, and FIG. 7 is a rotor yoke of the same. FIG. 8 is a longitudinal sectional view of the rotation driving unit according to the third embodiment, FIG. 9 is a top view showing the arrangement of the retaining fittings in FIG. 8, and FIG. 10 is another thrust receiving structure. FIG. 11 is a vertical cross-sectional view of the periphery of the lower portion of the spindle, FIG. 11 is a vertical cross-sectional view of the periphery of the spindle showing another retaining structure, FIG. 12 is a cross-sectional view taken along line AA of FIG. 11, and FIG. It is a side view of a wire spring. DESCRIPTION OF SYMBOLS 1 ... chassis, 3 ... coil 5 ... sliding bearing, 6 ... spindle 8 ... bush, 9 ... rotor yoke 10 ... magnet, 12 ... drive pin 14 ... support plate, 17 ... magnet for adsorption 18 Disc cassette, 19 Media 20 Hub 21 Magnet for attracting hub and biasing drive pin 22 Support plate 23 Ball 24 Thrust washer 25 Receiving member 26 … Retaining bracket 28… Wire spring 29… Carriage 30… Magnetic head

Claims (1)

(57) [Claims] 1. A drive motor for rotating a recording medium, and a chucking mechanism for holding the medium and transmitting the rotational driving force of the drive motor to the medium, wherein the motor is fixed to a rotating shaft. A rotor yoke, a magnet for rotational drive provided on an inner surface of the rotor yoke, and a coil disposed on a substrate facing the magnet, wherein the chucking mechanism is provided on an outer surface of the rotor yoke. A holding member for holding the medium, and a member for transmitting the rotational driving force of the drive motor by engaging with the medium and arranged to protrude from the rotor yoke through an opening formed in the rotor yoke. A joining member, and a support member disposed inside the inner diameter of the magnet and partially supported by the rotor yoke, for supporting the engaging member, wherein the support member includes: A recording or reproducing apparatus characterized in that the recording or reproducing apparatus is provided so as to be movable in the axial direction of the rotating shaft in a space inside the inner diameter of the magnet and a space surrounded by the coil.