JPH0250349A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To thin a device by mounting a medium holding means and a rotary driving force transmission means for a chucking mechanism on the outer plane and the inner plane of the rotor yoke of a driving motor. CONSTITUTION:The chucking mechanisms (12-17 and 31) are constituted integrally with the driving motors (1-11) by providing the motors (1-11) to rotate a recoding medium 19 and the chucking mechanisms (12-17 and 31) to transmit the rotary driving forces of the motors (1-11), mounting a means 17 to hold the medium 19 on the outer plane of the rotor yoke 9 for the motors (1-11), and mounting a means 12 to transmit the rotary driving force to the medium 19 on the inner plane of the rotor yoke 9. Therefore, it is possible to suppress the height of the whole of a rotary driving part consisting of the driving motors (1-11) and the chucking mechanisms (12-17 and 31). In such a way, the thinning of the device can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording or reproducing apparatus that records or reproduces information by rotationally driving a rotary recording medium by a drive motor.

[Prior Art] As this type of device, there is a floppy disk drive device (hereinafter abbreviated as FDD) that magnetically records or reproduces information on a floppy disk with a rotating 6nm recording medium.
There is. An FDD is provided with a disk drive motor (hereinafter abbreviated as DD motor) that rotationally drives the disk, and a chucking mechanism that holds the disk and transmits the rotational driving force of the DD motor to the disk. In a conventional FDD, a disk-shaped spindle hub is fixed to the tip of a spindle, which is an output rotating shaft of a DD motor, and a chucking mechanism is provided on the spindle hub using this hub as a base. A disk is held on a spindle hub, the disk is rotated 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] Nowadays, as FDDs are incorporated into portable personal computers, word processors, etc., there is a demand for smaller and thinner FDDs.

However, in conventional FDDs, as mentioned earlier, a spindle hub is provided on the DD motor and a chucking mechanism is provided on the hub, so the DD motor, which is the main part of the FDD mechanism,
It is difficult to keep the overall height of the rotary drive unit consisting of the motor and the chucking mechanism low, and this is a major obstacle to reducing the overall thickness of the FDD.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure that can be made thinner in a recording or reproducing apparatus that records or reproduces information by rotationally driving a rotary recording medium, not just an FDD, by a drive motor.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a motor that rotates a recording medium, and a chucking that holds the medium and transmits the rotational driving force of the motor to the medium. A recording or reproducing device having a mechanism, the motor having a rotor yoke, the chucking mechanism having means for holding a medium attached to the outer surface of the rotor yoke, and
A structure is adopted in which means for transmitting rotational driving force to the medium is attached to the inner surface of the rotor yoke.

[Function] According to such a structure, the medium holding means and the rotational driving force transmission means of the chucking mechanism are attached to the outer surface and inner surface of the rotor yoke of the drive motor, and the chucking mechanism uses the rotor yoke as an attachment base. Since it is constructed integrally with the motor, the height of the entire rotary drive section consisting of the drive motor and the chucking mechanism can be made much lower than in the past, and the recording or reproducing device can be made thinner.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

1 Retired Emperor 11 FIGS. 1 to 4 illustrate the structure of a disk rotation drive unit consisting of a DD motor and a chucking mechanism as a main part of an FDD according to a first embodiment of the present invention.

Before explaining the rotary drive section, let me briefly explain the structure of a floppy disk. Figure 3 shows a vertical cross section of the entire rotary drive section of an FDD.
In FIG. 41, reference numeral 18 is a disk cassette for a floppy disk, and a medium 19 made of a circular magnetic sheet is rotatably accommodated in the cassette 18. A hub 20 made of an iron plate or the like is fixed to the center of the media 19. The hub 20 is formed with a hole 20a into which a spindle 6, which will be described later, is fitted.

Next, the structure of the rotation drive section will be explained. In FIG. 1, reference numeral 1 denotes a chassis that supports each component of the FDD. The chassis 1 is made of a magnetic material such as an iron plate. This chassis 1 is used as a stator yoke, and chassis 1 and code 2
The DD motor is constructed from the following members indicated by 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 . The coil 3 of the DD motor is fixed on the FPCZ, which is not limited to the FPC but may also be a thin glass epoxy substrate or the like. A pattern 4 constituting a frequency generator that generates a pulse signal with a frequency corresponding to the rotational speed of the DD motor is fixed on the coil 3.

A sliding bearing 5 is fitted into the center of the portion of the chassis 1 where the DD motor is provided, and is fixed by a press-fit cap. A spindle 6, which is the output rotating shaft of the DD motor, is slidably and rotatably fitted into the sliding bearing 5. A screw 7 for preventing removal is screwed into the end of the spindle 6 on the chassis 1 side, and this prevents the spindle 6 from coming off in the upward direction in the figure toward the mounting side of the disk cassette 1B. is being done.

Next, a disc-shaped bushing 8 is fixed to the upper part of the spindle 6, and a rotor yoke 9 made of a cylindrical iron plate or the like is attached to the outer periphery of the bushing 8, as shown in FIG. It is fixed. The bushing 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 with an air gap AG in between. Furthermore, the second
The figure shows a longitudinal section of only 9 parts of the rotor yoke.

In addition, in the DD motor made up of the above-mentioned members, the spindle 6 is moved downward in FIG. A thrust load is applied to the Here, the thrust load is received by the upper surface of the sliding bearing 5. In order to reduce the rotational load on the DD motor due to the thrust load, a thrust washer 11 made of Teflon or the like having a small coefficient of friction is sandwiched between the upper surface of the sliding bearing 5 and the lower surface of the bushing 8 facing thereto.

In the DD motor having the above structure, when the coil 3 is energized 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. . This rotation rotates the hub 20 of the media 19 in the disk cassette 18, and the media 19 is driven to rotate.

Next, the structure of a chucking mechanism that holds the hub 20 of the media 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 indicated by reference numerals 12 to 17 and 3 in FIG.
It is composed of the following members indicated by 1, and these are attached to the lower surface (inner surface) and upper surface (outer surface) of the rotor yoke 9 of the DD motor as shown in the figure.

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

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

A shaft 15 for attaching the support plate 14 to the rotor yoke 9 is implanted on the end of the support plate 14 on the side opposite to the drive pin 12. @15 is inserted into a pot-shaped hole 9a formed in the rotor yoke 9 and a similar hole 17a formed in an attraction magnet 17 (described later), and the collar formed at the upper end of the shaft 15 is inserted into the narrow part of the hole 17a. so that it can be engaged with the edge of the

As shown in FIG. 4, the shaft 15 is pressed by bosses 9b formed near both sides of the hole 9a on the lower surface of the rotor yoke 9, and wire springs 16 stretched between the shaft 15 and 9b, and pushed toward the drive pin 12. It is constantly biased in the downward direction in FIG. Due to this bias, the shaft 15 is displaced toward the narrower portion of the holes 9a and 17a, and the collar at the upper end of the shaft 15 engages with the edge of the hole 17a, thereby attaching the shaft 15 to the rotor yoke 9. A support plate 14 is attached to the rotor yoke 9 so as to be rotatable in the vertical direction in FIG. 1 about a shaft 15 as a fulcrum.

Further, the support plate 14 made of a plastic magnet is urged upward in FIG. 1 by its own magnetic force that tends to attract the rotor yoke 9 made of a magnetic material. As a result, the drive pin 12 is urged to protrude above the rotor yoke 9 through the hole 9C formed in the rotor yoke 9 and the hole 17c formed in the attraction magnet 17, as shown in the downward direction in FIG.

On the other hand, the media 1 is placed on the upper surface of the rotor yoke 9 by magnetic force.
Attraction magnet 17 for attracting and holding the hub 20 of No. 9
is provided. The attraction magnet 1 is constructed as a plastic magnet, and is formed into a circular ring plate shape as shown in FIG.
arranged to surround. The attraction magnet 17 is formed with holes 17a and 1C through which the aforementioned shaft 15 and drive pin 12 are inserted, respectively. A recess 17b is formed around the hole 17a, so that the upper end of the shaft 15 does not protrude above the upper surface of the magnet 17 for attracting the hub 20. Note that the attraction magnet 17 is integrally fixed to the rotor yoke 9 by adhesive or the like.

Further, a circular ring-shaped Teflon washer 31 with a small coefficient of friction is provided on the bush 8 inside the attraction magnet 17 so that the rotor yoke 9 side easily rotates idly with respect to the hub 20 at the beginning of chucking, which will be described later. .

Next, the chucking operation of the chucking mechanism having the above configuration will be explained. During chucking, the disk cassette 18 is first loaded onto the rotor yoke 9 by a cassette loading mechanism (not shown), and the disk cassette 18 is loaded onto the rotor yoke 9 through the hole 20a at the center of the hub 20.
is fitted into the spindle 6, and the hub 20 is attracted and held onto the Teflon washer 18 by the magnetic force of the attraction magnet 1f. At this time, the drive bin 1 is
2 is pressed down, resisting the urging force in the direction B in FIG. 1, and pushed down from the position shown in the figure.

At the same time, the DD motor is driven by energizing the coil 3, and the rotor yoke 9 is connected to the bush 8 and the spindle 6.
rotates with. The drive pin 12 rotates idly against the lower surface of the hub 20 together with the rotor yoke 9, and when the position of the drive pin 12 comes to the engagement hole 20b of the hub 20, the drive pin 1
2 is the hole 20b in the direction B due to the bias of the support plate 14 mentioned above.
to be inserted into. Then, the drive pin 12 is engaged with the edge of the hole 20b by the biasing of the wire spring 16 in the direction A shown in FIG. That is, the drive bin 12 engages the hub 20 and the drive bin 12
The rotational driving force of the DD motor is transmitted to the hub 20 through the hub 20, the hub 20 is rotationally driven, and the media 19 is rotationally driven. A magnetic head (not shown) slides into contact with the rotationally driven medium 19 to perform recording and reproduction.

According to the FDD of this embodiment as described above, the attraction magnet 17 is integrally attached to the upper surface of the rotor yoke 9 of the DD motor as described above, and the magnet 17 for transmitting rotational driving force is attached to the lower surface of the rotor yoke 9. The support plate 14 of the drive bin 12 is attached, and the chucking mechanism is constructed integrally with the DD motor using the rotor yoke 9 as a base. The height of the entire rotary drive unit made up of the DD motor and the chucking mechanism can be significantly lowered than in the case of configuring a chucking mechanism, and the overall thickness of the FDD can be reduced.

Further, according to this embodiment, the spindle 6 is supported by a sliding bearing 5, and since it is extremely easy to use a short sliding bearing and make the height lower than in the case of a ball bearing, the height of this bearing is By lowering the DD motor, the overall thickness of the DD motor can be made thinner, and from this point of view,
The overall thickness can be reduced.

Furthermore, according to this embodiment, since the conventionally used spindle hub is eliminated, the number of parts can be reduced accordingly, and the cost of the FDD can be reduced.

In the above structure, the drive bin 12 is biased in the B direction by the magnetic force of the support plate 14, but the bias is not limited to the magnetic force, but other methods such as a spring may be used. Also good. Also, other methods may be used to hold the disk instead of relying on magnetic force. In short, no matter what type of chucking mechanism the chucking mechanism is
By attaching it to the rotor yoke of the D motor and configuring the chucking mechanism integrally with the DD motor using the rotor yoke as a base, the overall thickness of the FDD can be reduced.

Second Embodiment Next, FIGS. 5 to 7 show an FD according to a second embodiment of the present invention.
The structure of the rotation drive section D will be explained. In these figures, the same members as in FIGS. 1 to 4 of the first embodiment are given the same reference numerals, and their explanations will be omitted. The same applies to FIG. 8 and subsequent figures of the third embodiment described later.

The second embodiment shown in FIGS. 5 to 7 differs from the first embodiment in that a magnet designated by reference numeral 21 is embedded in the center of the rotor yoke 9 and is provided integrally with the rotor yoke 9. The magnet 21 is made of a plastic magnet and is formed in the shape of a disk, into which the spindle 6 is inserted and fixed. The magnet 21 is formed integrally with the rotor yoke 9 by insert molding, for example. The spindle 6 may also be molded during insert molding. However, the method of providing the magnet 21 is not limited to insert molding, but may also be adhesive, caulking, or the like.

Further, in this embodiment, the support plate 22 that supports the drive bin 12 is formed not from a magnet but from a magnetic material such as a non-magnetized iron plate.

With this structure, in this embodiment, the magnet 21 attracts and holds the hub 20 of the media 19 during chucking, and the magnet 21 attracts the support plate 22 to urge the drive bin 12 in the direction B. shall be.

According to this structure, the FDD can be made thin as in the first embodiment, and one magnet 21 can attract the hub 20 for chucking and energize the drive bin 12, and the structure can be improved. In addition to being simpler, the magnet 21 also serves as the bushing 8 of the first embodiment, making it possible to further reduce the number of parts and reduce costs compared to the first embodiment.

11 Danji Osato FIGS. 8 and 9 show the FD according to the third embodiment of the present invention.
It shows the structure of the rotation drive section D.

In this embodiment, a receiving structure for receiving a downward thrust load applied to the spindle 6 and a retaining structure for preventing the spindle 6 from coming off from the sliding bearing 5 upward in the figure are provided in the first and second structures. This is different from the example.

That is, in this embodiment, as shown in FIG. 8, in order to receive the thrust load, a disk-shaped bearing having a recess 25a is used as the member 25.
is fitted into the chassis 1 and fixed by a press-fit cap. The receiver may be formed in the chassis 1 in the shape of a concave portion of the member 25.

In this receiver, the sliding bearing 5 is fitted into the recess 25a of the member 25 and fixed by press-fitting or the like. A thrust washer 24 formed in the shape of a circular sheet made of Teflon or the like having a low coefficient of friction is provided on the center of the bottom surface of the member 25, which is the inner side of the sliding bearing 5. Furthermore, a substantially conical recess 6a is formed in the lower end surface of the spindle 6.

The ball 23 is fitted into the recess 6a and makes point contact with the thrust washer 24, so that the downward thrust load of the spindle 6 is received by the receiving member 25 via the thrust washer 24. There is.

In addition, since such a structure is provided, the thrust washer 11 that was provided between the sliding bearing 5 and the bushing 8 in the first and second embodiments is eliminated, and the sliding bearing 5 and the bushing 8 face each other with an air gap AG in between. It is supposed to be done.

On the other hand, in order to prevent the spindle 6 from being pulled out, a pull-out stopper 26 bent into a crank shape is provided. The removal stopper 26 is fixed on the chassis 1 with screws 27 so that its tip faces the outer peripheral edge of the upper surface of the rotor yoke 9 with a slight gap.

The arrangement of the removal stopper 26 is, for example, as shown in FIG.
They are provided at, for example, three locations at angles that substantially equally divide the outer periphery of the rotor yoke 9, avoiding the IO force direction movement area.

Of course, it is not limited to three locations.

With this 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 tip of the stopper 26, and the spindle 6 is prevented from being removed. That is, the upward movement of the spindle 6 is restricted within a predetermined range via the pull-out stopper 26, and stable rotation can be obtained. By arranging the removal stop metal fittings as shown in FIG. 9, the removal prevention can be stably controlled.

According to the structure of this embodiment, the downward thrust load of the spindle 6 is received through the ball 23 by point contact with the surface of the thrust washer 24.
The rotational load on the DD motor due to the thrust load is significantly smaller than in the first and second embodiments where the thrust load is received through surface contact, allowing the media 19 to rotate smoothly and reducing the power consumption of the DD motor. can.

The structure for receiving the thrust load of the spindle 6 through point contact may be as shown in FIG. 10. 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 6b is brought into point contact with the thrust washer 24 to receive a thrust load. With this structure as well, the same effects as in the case of FIG. 8 can be obtained.

Further, the structure for preventing the spindle 6 from being pulled out is not limited to that shown in FIGS. 8 and 9, but structures such as those shown in FIGS. 11 to 13 can be adopted, for example.

In the case of FIGS. 11 to 13, a wire spring 28 bent in a substantially U-shape is used to prevent the bushing from being removed. For this purpose, the bushing 8 fixed to the spindle 6 is placed over the top of the sliding bearing 5. It has a cylindrical shape, and has a linear groove 8a on the outer periphery of its lower end.

A wire spring 28 is fitted into the grooves 8a and aa.

The outer periphery of the upper end of the sliding bearing 5 is formed as an inclined tapered portion 5a, and a groove 5b is formed in the outer periphery of the sliding bearing 5 at a portion facing the groove 8a of the bushing 8. Since the wire spring 28 rotates together with the bush 8, the groove 5b is formed all around the outer circumference of the sliding bearing. The width of the groove 5b in the vertical direction is larger than the width of the groove 8a corresponding to the wire spring 28.

With this structure, the wire spring 28 is fitted into the groove 8a of the bushing 8, the spindle 6 is fitted into the sliding bearing 5, and the bushing 8 is inserted from above the sliding bearing 5, so that the wire spring 28 is inserted into the sliding bearing 5. The tapered portion 5a pushes the groove 5a apart and lowers the groove 5b, and it enters the groove 5b and returns to its original shape. That is, as shown in FIG. 11, the wire spring 28 is loosely fitted into the groove 5b with gaps above and below and inside. That is, wire spring 2
The distance between the opposing portions of the bushing 8 is regulated by the groove 8a of the bushing 8, and the diameter A of the groove 5b of the sliding bearing 5 is set smaller than that.

With such a structure, when the spindle 6 is displaced upward, the wire spring 28, which is displaced upward accordingly, moves to the first position of the groove 5b.
1, and the spindle 6 is prevented from moving further upward.

With this structure as well, the spindle 6 can be prevented from being pulled out in the same way as the case shown in FIG. 8, and the same effects can be obtained.

[Effects of the Invention] As is clear from the above description, the present invention includes a motor that rotates a recording medium, and a chucking mechanism that holds the medium and transmits the rotational driving force of the motor to the medium. A recording or reproducing device having a rotor yoke, wherein the motor has a rotor yoke, and the chucking mechanism has a means for holding a medium attached to an outer surface of the rotor yoke, and transmits a rotational driving force to the medium to an inner surface of the rotor yoke. We have adopted a structure that allows the means to be attached to
The chucking mechanism is integrated with the drive motor, making it possible to significantly reduce the overall height of the rotary drive unit consisting of the drive motor and chucking mechanism compared to conventional systems, making the recording or playback device thinner and reducing the number of parts. This has the excellent effect of reducing costs and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of the disk rotation drive section of an FDD according to the first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the rotor yoke section in FIG. 1, and FIGS. 3 and 4 are 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 longitudinal sectional view of the rotor yoke in FIG. 5. FIG. 8 is a vertical sectional view of the rotary drive unit according to the third embodiment, FIG. 9 is a top view showing the arrangement of the removal stopper in FIG. 8, and FIG. 10 is a view of another thrust receiver. 11 is a longitudinal sectional view of the spindle periphery showing the structure, FIG. 11 is a longitudinal sectional view of the spindle periphery showing another pull-out prevention structure, FIG. 12 is a sectional view taken along line A-A in FIG. 11, and FIG. 13 is a side view of the bushing and wire spring. 1... Chassis 3... Coil 5... Sliding bearing 6... Spindle 8... Bushing
9... Rotor yoke 10... Magnet
12... Drive pin 14... Support plate 1
7... Attraction magnet 18... Disk cassette 19.
...Media 20...Hub 21...Magnet 22 for hub attraction and drive pin biasing...
・Support plate 23... Ball 24... Thrust washer 25... Receptacle is member 26... Removal stop metal fitting 2
8... wire spring 29... carriage 0...
・Magnetic head

Claims (1)

[Claims] 1) a motor that rotates a recording medium and a motor that holds the medium;
A recording or reproducing device having a chucking mechanism for transmitting rotational driving force of the motor to the medium, the motor having a rotor yoke, and a means for holding the medium attached to the outer surface of the rotor yoke. A recording or reproducing apparatus characterized in that the recording or reproducing apparatus is configured such that means for transmitting rotational driving force to the medium is attached to an inner surface of the rotor yoke.