JPH09231669A - Flexible magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the rigidity of a frame and hence to prevent its distortion by fixing a stator to a 1st fixing part from an upper side of a bottom surface part of the frame, fixing a base part with a bearing facing the side of the bottom surface part to a 2nd fixing part and making a rotor magnet and a teeth part opposite to each other on the upper side of the bottom surface part. SOLUTION: An inner rotor type motor 3 is divided into a part to be directly fitted to the frame 2 of the device main body and a part to be fitted to a base 3d processed by electric wiring, and both parts are fitted to the frame 2 so as to function as the motor. Consequently, it is not necessary to bore a large hole to impair the rigidity of the frame 2, and both an outer rotor type motor and this inner rotor type motor can be mounted. In addition, by specifying the length between a rotary shaft 3a of the inner rotor type motor 3 and its bearing 3b so as to equalize a distance between the surface of the base 3d and the surface of a hub 3g to a distance between the surface of a base 6d and the surface of the hub 3g, the fixing part 2c can be shared in a simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible magnetic disk device, and more particularly to a structure of an apparatus for using a recording medium drive motor having a different structure.

[0002]

2. Description of the Related Art FIG. 8 and FIG. 9 are thick type (thickness 1 inch)
FIG. 1 is an overall view showing a flexible magnetic disk device and an exploded perspective view thereof. FIG. 10 shows a radial gap type motor with a core mounted on the flexible magnetic disk device shown in FIGS. 8 and 9, and a rotor (rotor magnet) with respect to the rotating shaft.
2 is a cross-sectional view of a so-called outer rotor type motor in which is arranged on the outer peripheral side of the stator. 11 and FIG.
2 is an overall view showing a thin (1/2 inch thick) flexible magnetic disk device and an exploded perspective view thereof. FIG.
Reference numeral 3 denotes a radial gap type motor with a core mounted on the flexible magnetic disk device shown in FIGS. 11 and 12, a so-called inner rotor in which a rotor (rotor magnet) is arranged on an inner peripheral side of a stator with respect to a rotating shaft. A sectional view of a model motor is shown.

8 to 13, reference numeral 20 denotes a thick (1 inch thick) flexible magnetic disk device, and 30 denotes a thin (1/2 inch thick) flexible magnetic disk device. Reference numeral 40 is a magnetic disk, 41 is a recording medium housed in the magnetic disk 40, and 21 and 31 are magnetic disks 40.
, 21a, 31a are holders for holding the magnetic disk 40 in a removable manner, 21b, 3a.
1b is a slide cam for loading or unloading the magnetic disk 40 while engaging with the holders 21a, 31a, and 21c, 31c are slide cams 21b,
A spring for urging 31b in the unloading direction, 21
When loading the magnetic disk 40, d and 31d move the shutter of the magnetic disk 40 while engaging with and rotating the magnetic disk 40 to expose the recording medium 41. At the time of unloading, the magnetic disk 40 is biased by an appropriate amount of spring force. The ejecting levers 21e and 31e are magnetic disks 4
Slide cam 21 so that 0 is retained in the load position.
a latch lever 21 for restricting the movement of b, 31b
f and 31f are springs for urging the levers 21e and 31e, 2
Reference numerals 1g and 31g denote switch portions provided on the slide cams 21b and 31b which serve as switches for releasing the regulation of the levers 21e and 31e and unloading the magnetic disk 40. Reference numerals 22 and 32 denote head moving mechanism portions 22b and 32 for moving the heads 22a and 32a for recording, reproducing or erasing in a direction orthogonal to the rotation direction of the recording medium 41.
Reference numeral b denotes a step motor for moving the head moving mechanism units 22 and 32 in a direction orthogonal to the rotation direction of the recording medium 41.
Reference numerals 3 and 33 are control board portions of the flexible magnetic disk devices 20 and 30.

Reference numeral 24 is an outer rotor type motor for rotating the recording medium 41, 24a is a rotary shaft, and 24b is a rotary shaft 24.
a is a pair of bearings that rotatably support a;
A housing part for accommodating and supporting b, a housing part 24c provided for 24d, a base whose main material subjected to electrical circuit wiring processing is iron, and 24e rotates about a rotary shaft 24a via a hub described later. The rotor 24f is an annular rotor magnet that is magnetized in multiple poles of S poles and N poles alternately and is fixed to the inner peripheral surface of the rotor 24e, and 24g has a chucking portion for holding the recording medium 41. , A hub having an outer periphery fixed to the rotor 24f and a central portion fixed to the rotating shaft 24a, and 24h a magnetic pole surface of the rotor magnet 24f and the teeth 2.
The laminated stator made of a magnetic material is fixedly provided on the base 24d on the inner peripheral side of the rotor magnet 24f so that the end faces of 4i face each other with a predetermined gap, and 24j is wound around the teeth 24i of the stator 24h. It is a coil. 2
Reference numeral 5 denotes an iron plate, a frame for accommodating or attaching each mechanical element, 25a denotes a bottom plate portion of the frame 25 to which an outer rotor type motor 24 and a substrate portion are attached on the lower surface side, and a head moving mechanism portion 22, a disk on the upper surface side. The moving mechanism unit 21 and the like are attached. Reference numeral 25b is a hole provided in the bottom plate portion 25a so that the rotor 24e of the outer rotor type motor 24 can be inserted therethrough and the hub 24g can chuck the recording medium 41 to rotate the recording medium 41. Reference numeral 25c is a loading position of the magnetic disk 40. And a supporting portion formed by cutting and raising so as to slidably lock the slide cam 21b, and 25d is a bottom plate portion 25a of the frame 25.
The motor base fixing portion formed by cutting and raising from the rotor 25d is the rotor 2 integrally formed with the bottom plate portion 25a.
4e is a protrusion for preventing removal.

Further, 34 is an inner rotor type motor for rotating the recording medium 41, 34a is a rotating shaft, 34b is a bearing for rotatably supporting the rotating shaft 34a, and a bearing end 34c is caulked to a frame 35 described later. Has been done. 34
d is a rotor that rotates about a rotary shaft 34a via a hub described later, 34e is an annular rotor magnet that is magnetized with S poles and N poles alternately in multiple poles, and is fixed to the outer peripheral surface of the rotor 34d. Reference numeral 34f denotes a hub having a chucking portion for holding the recording medium 41, the outer periphery being fixed to the rotor 34d, and the central portion being fixed to the rotating shaft 34a, and 34g is the rotor magnet 34.
The laminated stator made of a magnetic material is provided on the outer circumference of the rotor 34d so that the magnetic pole surface of e and the end surface of the tooth 34h face each other with a predetermined gap, 34i is a coil wound around the tooth 34h of the stator 34g, 34j is a stator cover. Reference numeral 35 is a frame made of aluminum die-casting for accommodating or attaching each mechanical element, 35a is a hole for crimping the bearing end 34c, 35b is a magnetic disk 40 which is positioned and supported at a load position, and a slide cam 32b is slid. Reference numeral 35c is a support portion formed so as to be movably locked, and 35c is a stator 34g mounting portion.

Next, the operation will be described. Since there is not much difference in operation between the thick type and the thin type, the operation of the thick type flexible magnetic disk device will be described. When the magnetic disk 40 is inserted in the direction of the arrow, the disk moving mechanism section 21 operates to place the magnetic disk 40 at the load position and the head 2 of the head moving mechanism section 22.
2a comes into contact with the recording medium 41. In this case, the magnetic disk 40 is held by the holder 21a and positioned and supported by the support portion 25c. The magnetic medium 41 is held by the chucking portion of the hub 24g. Here, when a signal for recording, reproducing, erasing, etc. is input from the system side such as a personal computer, the motor 24 is rotationally driven to rotate the recording medium 41, and the head moving mechanism section 22 moves the head 22a to a predetermined track. Seek to record, play, and erase. Further, when the magnetic disk 40 is taken out, the switch portion 21g is pressed to operate the disk moving mechanism portion 21 to place the flexible magnetic disk 40 at the attachment / detachment position.

[0007]

As described above, the radial gap type motor with a core currently used in a flexible magnetic disk device has an outer rotor type having a stator on the inner peripheral side of the rotor and a stator on the outer peripheral side of the rotor. There is an inner rotor type. As a merit and a demerit of comparing these, the outer rotor type motor has a shape that the rotor covers the entire surface of the motor, which makes it thicker and not suitable for thinning, but since the rotor itself has an outer diameter, the inertia of the rotor is sufficient. As a result, the width dimension can be relatively suppressed. The inner rotor type motor can be made relatively thin because the rotor does not cover the entire surface of the motor, but the rotor needs a certain outer diameter to obtain inertia. Since the stator is arranged on the outer circumference, the outer diameter of the motor tends to be large, which in turn tends to increase the width dimension of the flexible magnetic disk device.

Further, regarding the price aspect of the current motor, considering the manufacturing method, particularly the winding method, in the outer rotor type motor, the teeth are radially radially outward and the outer circumferential side is opened, and the teeth are opened. Winding is easy because the spacing between the end faces is relatively wide, but the inner rotor type motor has the features that teeth are projected from the inner circumference side toward the center, and the spacing between the teeth open end faces is narrow, making it difficult to perform winding. . There are many other reasons, but in terms of motor price, the inner rotor type motor is more expensive than the outer rotor type motor.

According to the characteristics of each motor as described above,
The outer rotor type motor is used in a flexible magnetic disk device in which the dimension in the thickness direction is not a problem (however, a thickness of about 1 inch is the mainstream). The inner rotor type motor is thin (thickness 1 1/2 inch,
It is used for a flexible magnetic disk drive of about 3/4 inch).

However, due to the trend of devices equipped with a flexible magnetic disk device such as a personal computer, it is required that the personal computer itself be made thinner, or a flexible magnetic disk device, which is an accessory for system upgrade, be made thinner. Has been done. From this, it is expected that the inner rotor type motor will be more standardized and the cost resistance will be improved in the future with the promotion of the thinning, and the inner rotor type motor will be cheaper than the outer rotor type motor.
In particular, according to Japanese Patent Application No. 6-92401 of the same applicant as the present invention, it is possible to improve the winding work of the inner rotor type motor and obtain an inexpensive motor with good performance. Therefore, it is desirable that the inner rotor type motor can be used even in a thick type (about 1 inch thick) flexible magnetic disk device.

Here, considering the mounting structure of each motor in the flexible magnetic disk device, in the case of the inner rotor type motor, a hole larger than the stator of the inner rotor type motor is provided in the frame in terms of frame rigidity. Is difficult, so the rotary shaft (bearing) directly on the frame,
It had a structure to attach a stator etc. As is well known, most flexible magnetic disk devices are mounted on a system such as a personal computer, and in addition to the rigidity for mounting their own parts on the frame, they can also resist the force generated when mounting on a personal computer. So that the rigidity must be secured. Also, in the case of the outer rotor type motor, a hole is made in the frame to adjust the height direction, and a structure in which a rotary shaft (bearing), a stator, etc. are mounted on the base is mounted from the lower side of the frame. . That is, the components are assembled as a motor in a frame or a base, and the mounting dimensional accuracy of each part is ensured, and particularly the dimensional accuracy of the rotor magnet and the stator is maintained. This is because the dimensional accuracy of the arrangement of the rotor magnet and the stator (opposing arrangement and air gap) is important for obtaining a stable rotational driving force for the motor.

However, if both of them are to be mounted on the same frame, it is difficult to make the frame as large as the outer diameter (stator diameter) of the inner rotor type motor, as described above, and the outer rotor type motor is used. In this case, in order to adjust the height direction, it is necessary to form a hole (dent) larger than the outer diameter (rotor) of the outer rotor type motor by drawing etc. to make a step, but if it is too large, the frame It becomes difficult to obtain the dimensional accuracy of.

Therefore, according to the present invention, the inner rotor type motor is divided into a portion directly attached to the frame and a portion attached to the motor base, and both are attached to the frame to function as a motor. We examined a structure that allows both an inner rotor type motor and an outer rotor type motor to be mounted while ensuring rigidity and dimensional accuracy.

Here, the base fixing portion of the conventional frame is formed by bending (cut-and-raising), and any one of the fixing portions formed at a plurality of portions by bending is subjected to material handling during the frame manufacturing process. Medium deformation during assembly, assembling, etc., and this slight deformation, especially in the inner rotor type motor, causes the distance between the rotor magnet and teeth to fluctuate, impairing the motor's rotation characteristics, and normal recording / reproduction can be performed. May hinder. To describe the deformation during assembly in detail, in the case of conventional bending, since each fixing part is bent on one side along the circumferential direction of the hole on the bottom surface of the frame, the radial direction of the hole It is weak against pulling force and compressive force to the motor, and if the pulling force and compressing force from each fixed part become imbalanced when mounting the motor base, a slight deformation will occur in the bent part and a non-negligible assembly error will occur. There is a possibility that the rotation characteristics of the motor may be impaired and normal recording and reproduction may be hindered. Further, the outer rotor type motor does not have the same problem as the inner rotor type motor, but if the deformation is too large, the chucking portion may not be able to accurately hold the magnetic medium, and normal recording and reproduction may be hindered. Further, since it is possible to mount an inner rotor type motor having a large outer diameter, it becomes difficult to provide the rotor slip-out prevention portion of the outer rotor type motor on the frame.

In the present invention, the structure of a flexible magnetic disk device which solves the above problems and can be used for both an outer rotor type motor and an inner rotor type motor while ensuring frame rigidity and motor characteristics. Is provided.

[0016]

According to another aspect of the present invention, there is provided a flexible magnetic disk device, which comprises a disk moving means for arranging a magnetic disk at a loading position for recording / reproducing and a mounting / dismounting position for mounting / dismounting the magnetic disk, and contacting the magnetic disk. The magnetic head for recording and reproducing, the head moving means for arranging the magnetic head on a desired track of the magnetic disk, the rotating shaft, and the chucking portion for holding the magnetic disk at the loading position. A rotating portion having a hub portion fixed to the shaft, an annular rotor fixed to the hub portion and rotating about the rotation axis, and an annular rotor magnet fixed around the rotor; A bearing that supports the rotor, a base portion that fixes the bearing, and a stator that has a tooth portion that faces the rotor magnet and that faces the rotor magnet. Rotating means for rotating the magnetic disk, a hole through which the rotating portion can be inserted in the bottom portion, a first fixing portion for fixing the stator, and a drawing process for fixing the base to fix the base portion to the bottom portion. A frame having a second fixing portion formed on the lower side, and housing or mounting the disk moving means and the head moving means on the upper side of the bottom surface section; and the stator from the upper side of the bottom surface section. Fixing to the first fixing portion, fixing the base portion to the second fixing portion with the bearing facing the bottom surface side,
The rotor magnet and the teeth portion are opposed to each other on the upper side of the bottom surface portion.

According to a second aspect of the present invention, in addition to the flexible magnetic disk device according to the first aspect, the second fixed portion has a rectangular portion whose long side extends in a direction orthogonal to the radial direction of the rotating shaft. It is formed by processing.

According to a third aspect of the present invention, there is provided a flexible magnetic disk device according to the second aspect of the present invention, in addition to the flexible magnetic disk device according to the second aspect, the second fixing portion is formed by cutting out a long side portion from a bottom surface portion and a short side portion being the bottom surface. It is formed by drawing a rectangular portion connected to the section.

In the flexible magnetic disk device according to a fourth aspect, in addition to the flexible magnetic disk device according to the first aspect, the first fixing portion and the second fixing portion are alternately and substantially equal to each other along the circumference of the hole. It is arranged at intervals.

According to a fifth aspect of the present invention, there is provided a flexible magnetic disk device, which is a disk moving means for arranging a magnetic disk at a loading position for recording / reproducing and a loading / unloading position for loading / unloading the disk.
A magnetic head that is in contact with the magnetic disk for recording and reproducing, a head moving unit that disposes the magnetic head on a desired track of the magnetic disk, a rotation shaft, and a chucking unit that holds the magnetic disk at the loading position. And a rotating portion having a hub portion fixed to the rotating shaft, an annular rotor fixed to the hub portion and rotating about the rotating shaft, and an annular rotor magnet fixed around the rotor. And a bearing that supports the rotating shaft, a base portion that fixes the bearing, and a stator that has a tooth portion that faces the rotor magnet and that faces the rotor magnet, and rotate the magnetic disk. The rotating means, a hole portion through which the rotating portion can be inserted in the bottom surface portion, and a fixing portion formed on the lower side of the bottom surface portion by drawing for fixing the base are provided. A frame for accommodating or mounting the moving means and the head moving means on the upper side of the bottom surface portion, fixing the base portion to the fixed portion with the bearing facing the bottom surface portion side, and on the upper side of the bottom surface portion. The hub portion is arranged.

According to a sixth aspect of the present invention, there is provided a flexible magnetic disk device according to the fifth aspect, wherein the fixed portion is formed by drawing a rectangular portion having a long side in a direction orthogonal to the radial direction of the rotation axis. It was done.

According to a seventh aspect of the present invention, in addition to the flexible magnetic disk device according to the sixth aspect, the fixing portion is formed by cutting out the long side portion from the bottom surface portion, and the short side portion is connected to the bottom surface portion. The rectangular portion is formed by drawing.

In addition to the flexible magnetic disk device according to the fifth aspect, the flexible magnetic disk device according to the eighth aspect is provided with a restricting means for restricting the movement of the rotor in the axial direction of the rotating shaft in the disk moving means. is there.

According to a ninth aspect of the present invention, there is provided a flexible magnetic disk device according to the eighth aspect, wherein in addition to the flexible magnetic disk device according to the eighth aspect, the disk moving means has a holder portion for detachably holding the magnetic disk and the holder arranged above the rotor. And a holder moving part that engages with the cam part to move the holder part between a loading position and a mounting / removing position, and the holder moving part for point-contact with the rotor to restrict the movement of the rotor in the axial direction of the rotating shaft. It has a regulation means provided in the section.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. An embodiment of the present invention will be described. 1 is an overall view of a flexible magnetic disk device showing Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of a flexible magnetic disk device in which an outer rotor type motor is mounted, and FIG. 3 is an inner rotor type motor. FIG. 3 is an exploded perspective view of the case where the is mounted. 4a and 4b are mounting portions of the motor viewed from the direction A of FIGS. 2 and 3, respectively, and FIG. 4a shows an outer rotor type motor mounting diagram,
FIG. 4b shows a diagram of mounting the inner rotor type motor. FIG.
4a and 4b are cross-sectional views of FIGS. 4a and 4b, respectively, and FIG. 6 shows details of a slip-out prevention portion when the rotor of the outer rotor type motor is mounted. FIG. 6a is an enlarged view of the rotor slip-out prevention portion, and FIG. 6A shows the relationship between the carriage, the rotor, and the rotor slip-off prevention portion as viewed from the arrow B of FIG. 6A, A is the distance between the rotor and the carriage, and B is the distance between the rotor and the rotor slip-out prevention portion. FIG. 6c shows the relationship between the rotor, the rotor slip-out prevention portion, and the magnetic disk, and C shows the distance between the tip of the rotating shaft and the magnetic disk. FIG. 7 is a detailed view showing the relationship between the base fixing portion and the stator mounting portion provided on the frame.

The respective structures of the flexible magnetic disk device having the outer rotor type motor and the flexible magnetic disk device having the inner rotor type motor will be described. Reference numeral 1a is a flexible magnetic disk device having an outer rotor type motor 6 mounted thereon, and 1b is a flexible magnetic disk device having an inner rotor type motor 3 mounted thereon.

Reference numeral 2 denotes a frame made of sheet metal having a plate thickness of 1 mm, which has been subjected to a drawing process, a cut-and-raising process, etc. for accommodating or mounting each of the mechanical elements, and the outer rotor type motor 6 and the inner rotor type motor 3 are commonly used. It has a structure that allows it. The main parts are described below. 2a is a bottom plate portion of the frame 2, 2b is a rotor 3f of the inner rotor type motor 3, and a rotor 6f of the outer rotor type motor 6 is inserted into the upper side of the bottom plate portion 2a of the frame 2 so that its diameter is an outer rotor type motor. 6 is a hole portion (diameter 60 mm or less) formed larger than the outer diameter of the rotor 6 and smaller than the outer diameter of the stator of the inner rotor type motor 3.

Reference numeral 2c designates a base fixing portion for mounting the base portion of the motor. The base fixing portion 2c is drawn at three positions at substantially equal distances (radius) about the rotation axis of the motor at substantially equal angles, and is drawn downward in the bottom plate portion 2a. Has been formed. As shown in FIG. 7, the base fixing portion 2c forms a long side along the circumference of the hole 2b in a direction orthogonal to the radial direction of the rotation axis, and the long side portion is punched by a square long hole. The rectangular portion formed by the long side and the short side connected to the bottom plate portion 2a is drawn. Since the dimension to be projected below the bottom plate portion 2a is applied from the direction (long side) orthogonal to the radial direction of the rotary shafts 3a and 6a of the motor, the drawn portion swells in the radial direction of the rotary shaft. This suppresses the increase in the width direction of the flexible magnetic disk device. Further, since the long side portion is formed by cutting out, it is easy to perform the drawing process, the distortion of the frame is easily suppressed, and the flatness can be improved. The base fixing portion 2c is provided with a female screw portion for screwing. In the present embodiment, as an optimum form, the long side portion is formed along the circumference of the hole 2b and by a punching process such as a rectangular long hole to perform the drawing process. However, the flatness and distortion of the frame are affected. It is needless to say that the drawing process may be performed within a range that does not give, and the drawn part may be tubular even if it has three sides.

Positioning guides 2d and 2e each have a support portion for positioning and supporting the magnetic disk 40 at the load position, and a guide portion for allowing a slide cam 4c described later to slide at a position separated from the surface of the bottom plate portion 2a by a predetermined distance. And is formed by cutting and raising. The positioning guide portions 2c and 2d are provided symmetrically with respect to the center line in the width direction of the flexible magnetic disk device, which is difficult to see in FIGS. Reference numeral 2f is a mounting portion for mounting the stator of the inner rotor type motor 3, and is slightly projected on the upper surface side of the bottom plate portion 2a by tubular drawing. Similar to the fixed portion 2c, the mounting portions 2f are provided at three locations at substantially equal distances (radius) about the rotation axis of the motor and at substantially equal angles. Further, the mounting portion 2f and the fixed portion 2c are provided so as to alternate with each other when viewed from the rotation shaft of the motor. still,
The mounting portion 2f is also provided with a female screw for screwing.
Reference numeral 2g is a guide groove provided on a side portion for restricting movement of a holder portion described later so that the holder portion moves only in the vertical direction.

Reference numeral 3 is an inner rotor type motor for rotating the recording medium 41, 3a is a rotating shaft, 3b is a bearing for rotatably supporting the rotating shaft 3a, and both surfaces of the hub 3g are hubs of the outer rotor type motor 6. It is longer in the thrust direction than the inner rotor type motor 34 described above so as to be the same as the 6g surface. At this part, the height of the inner rotor type motor and the outer rotor type motor is adjusted. still,
The bearing 3b is caulked to the base 3d at the bearing end 3c. 3d is an electric component such as an FG detection circuit for detecting the speed of the motor, a hall element for detecting an index, a hall element for detecting a position, a base on which electric wiring processing has been performed, an electric component, etc. on the control board 7b such as an FFC. It is electrically connected. The base 3d is provided with a hole 3e for attaching to the base fixing portion 2c of the frame 2 with a screw. Reference numeral 3f denotes a rotor that rotates about the rotating shaft 3a via the hub 3g, and has a diameter substantially the same as that of the hub 6g of the outer rotor type motor 6 (the rotor 3f is slightly larger). 3
Reference numeral h denotes an annular multi-pole magnetized rotor magnet fixed to the outer peripheral surface of the rotor 3f, 3g has a chucking portion for holding the recording medium 41, the outer periphery is fixed to the rotor 3f, and the central portion rotates. The hub 3i fixed to the shaft 3a is made of a laminated magnetic material, and the stator 3k is attached to the attachment portion 2f so that the magnetic pole surface of the rotor magnet 3h and the end surface of the tooth 3j face each other with a predetermined gap. The coil wound around the terminal of the coil 3k is electrically connected to the control board 7b. Reference numeral 3l is a stator cover having an annular rotor removal preventing piece 3m. Both the stator 3i and the stator cover 3l are provided with holes in the mounting portion 2f for mounting with screws from the upper surface side of the bottom plate portion 2a.

The inner rotor type motor 3 includes a stator 3
i and the stator cover 3l are attached to the frame 2 from the upper surface side of the bottom plate surface 2a, and the base 3c to which the bearing for inserting and supporting the rotating shaft 3a is caulked is the bottom plate portion 2a.
It is attached to the lower fixed portion 2c. Then, the stator 3i (teeth 3j) and the hole 2 are provided on the upper surface side of the bottom plate 2a.
By arranging the rotor 3f (rotor magnet 3h), which is inserted through b, so as to face each other, the frame 2 serves as a motor. Therefore, the bottom plate portion 2 of the frame 2
When a is a neutral surface, the stator 3i, the teeth 3j,
Parts provided from the upper surface side of the bottom plate portion 2a such as the coil 3k and the stator cover 3l, the rotating shaft 3a, the bearing 3b,
Bottom plate 2a such as base 3d, rotor 3f and hub 3g
The parts are roughly divided into parts provided from the lower surface side.

Reference numeral 4 denotes a disk moving mechanism for loading and unloading the magnetic disk 40 so that the magnetic disk 40 can be recorded, reproduced, and erased, and unloading for mounting and dismounting the magnetic disk 40. Reference numeral 4a is a holder for detachably holding the magnetic disk 40. Reference numeral 4b designates a protrusion provided on both side surfaces of the holder 4a, and reference numeral 4c designates a slide cam for engaging the pin 4b with the cam portion to move the holder up and down to move the magnetic disk 40 between the loading position and the loading / unloading position. Is a spring for urging the slide cam 4c in the unloading direction, and 4e is engaged with and rotates the magnetic disk 40 when the magnetic disk 40 is loaded, and the shutter of the magnetic disk 40 is moved to expose the recording medium 41. At the time of loading, the function of ejecting an appropriate amount of magnetic disk 40 by the urging force of spring 4f and the magnetic disk As disk 40 is held at the loading position, the lever having a function of regulating the movement of the slide cam 4c, 4g switch portion provided on the slide cam 4c to move the magnetic disk 40 in the detachable position,
Reference numeral 4h designates a rotor slip-out preventing portion of the outer rotor type motor provided on the slide cam 4c, and a resin molded product is used in the present embodiment. Reference numeral 4i is a protrusion provided on the rotor side of the rotor slip-off preventing portion 4h. In this embodiment, the rotor slip-off preventing portion 4h is provided separately from the slide cam 4c, but it may be provided integrally by sheet metal working, resin molding, or the like. In the case of the present invention, it suffices to simply take care so as not to make unnecessary contact with the stator cover 3l or the like of the inner rotor type motor 3.

Reference numeral 5 denotes a head moving mechanism portion for moving a head, which will be described later, in a direction orthogonal to the rotating direction of the magnetic disk 40.
Reference numeral 5a denotes a head provided on the head moving mechanism unit 5 for slidingly contacting the recording medium 41 to perform magnetic conversion such as recording, reproduction, and erasing, and 5b denotes a carriage unit on which the head 5a is mounted.
5c is an arm part that also carries the head 5a, and 5d
Is a step motor for moving the head 5a in a direction orthogonal to the rotation direction of the magnetic disk 41.

Reference numeral 6 is an outer rotor type motor for rotating the recording medium 41, 6a is a rotating shaft, 6b is a pair of bearings for rotatably supporting the rotating shaft 6a, 6c is a housing portion for accommodating and supporting the bearing 6b, and 6d is A housing portion 6c is provided, and an electrical component such as an FG detection circuit for detecting the speed of the motor, a hall element for index detection, a hall element for position detection, and electrical wiring processing, and a motor drive circuit are provided. The base 6d is made of iron, and the base 6d is provided with a hole 6e for attaching to the base fixing portion 2c of the frame 2 with a screw. Reference numeral 6f denotes a rotor which rotates about a rotating shaft 6a via a hub 6g described later, 6h denotes an annular multi-pole magnetized rotor magnet fixed to an inner peripheral surface of the rotor 6f, and 6g denotes a recording medium 41. A hub having a chucking portion for holding the outer peripheral surface of the rotor 6f and a central portion of the hub fixed to the rotating shaft 6a. The magnetic pole surface of the rotor magnet 6h and the end surfaces of the teeth 6j face each other at a predetermined distance. As described above, the stator 6 made of a laminated magnetic material is fixedly provided on the base 6d on the inner peripheral side of the rotor magnet 6h.
k is a coil wound around the tooth 6j of the stator 6i.

The outer rotor type motor 6 has a base 6d.
All of the motor components are configured above, the base 6d is attached to the fixed portion 2c of the frame 2, the rotor 6f is inserted through the hole 2b, and the hub 6g is arranged on the upper surface side of the bottom plate portion 2a.
Further, it is mounted on the flexible magnetic disk device 1a by electrically connecting to the control board 7a. The difference between the outer rotor type motor 6 and the outer rotor type motor 24 described above is that the hole portion 6e provided in the base 6d is different.
There is not much difference between them because of the difference in position.

The difference in the method of assembling the outer rotor type motor 6 and the inner rotor type motor 3 into the frame 2 will be described. First, when the outer rotor type motor 6 is mounted, the hole portion of the base 6d from the lower side of the frame 2 is inserted. 6e
The motor 6 is fixed to the frame 2 by attaching and fixing the motor 6 to the fixing portion 2c with screws.
f is arranged so as to penetrate through the hole 2b. In this case, the dimensional accuracy of the stator 6i and the rotor magnet 6h is the same as when it is attached to the base 6d, and the motor characteristics are not affected in any way. However, the base fixing portion 2c of the present embodiment is less deformed than the conventional base fixing portion, and the magnetic medium 41 can be chucked more accurately.

When the inner rotor type motor 3 is mounted, the holes of the stator 3i and the stator cover 3l are aligned from the upper side of the frame 2 with the mounting portions 2f and fixed by screwing. From the above, the hole 3e of the base 3d is fixed to the fixing portion 2c by screwing and fixing, so that the motor is configured with the frame 2 as a part of its housing, and the rotor 3f is inserted through the hole 2b and the rotor magnet is inserted. 3h and stator 3i (teeth 3j) are arranged to face each other. In the case of this inner rotor type motor 3, since the arrangement of the stator 3i and the rotor magnet 3h is determined when assembled into the frame 2, not only the dimensional accuracy of each fixing portion and the mounting portion is required, but also the maintenance of the accuracy is required. It should be noted that both are formed by drawing, so it is easier to maintain accuracy. At this time, no matter which motor is mounted, the distances from the bottom plate portion 2a surface of the frame 2 to the hub surface (the distance between the support portion of the positioning guide portion 2d and the hub surface may be equal) are substantially equal to each motor. The distance from the base surface to the hub surface is equal.

Reference numeral 7a denotes a flexible magnetic disk device 1a.
The control board used when the outer rotor type motor 6 is mounted, and the control board 7b used when the inner rotor type motor 3 of the flexible magnetic disk device 1b is mounted. The control board 7a is provided with a control IC 7c that does not include a motor drive circuit for the outer rotor type motor 6 and an electrical connection portion 7d with the outer rotor type motor 6, and the control board 7b is provided with a motor for the inner rotor type motor 3. Control IC 7e including drive circuit and inner rotor type motor 3
A connecting portion 7f for connecting the coil terminals is provided.

Next, the operation will be described. When the magnetic disk 40 is inserted into the holder 4a and further pushed by a predetermined amount, the magnetic disk 40 is brought into contact with the lever 4d, and the lever 4
d rotates, the shutter of the magnetic disk 40 is opened, and the lever 4d releases the lock of the slide cam 4c in the state where the shutter is opened, so that the slide cam 4c moves. With the movement of the slide cam 4c, the cam portion engages with the protrusion 4b and moves the holder 4a downward (the bottom plate portion 2a).
Side). The magnetic disk 40 is positioned at the load position by the positioning guide portion 2d, and the head 5a comes into contact with the recording medium 41 so that recording, reproduction, erasing, etc. can be performed.

A motor 3 or a motor 6 for rotating the recording medium 41 based on a signal from the system side such as a personal computer.
Is driven to rotate, and recording, reproduction, erasing, etc. are performed. Here, the operation of the rotor slip-off preventing portion will be described. The rotor 3f of the inner rotor type motor 3 and the rotor 6f of the outer rotor type motor 6 are attached to the rotating shaft 3
Since a and the rotating shaft 6a are only inserted and supported by the bearing 3b and the bearing 6b, they can be moved in the thrust direction of the rotating shaft (the direction away from the base). When the rotor 3f and the rotor 6f rotate, or when some force is applied to the rotor 3f, the rotor 6f, the hub 3g, the hub 6g, the rotating shaft 3a, the rotating shaft 6a, etc. in the thrust direction of the rotating shaft ( Vibration or shock when carrying when used vertically installed, rotor 3f,
The rotor 6f and the like are separated from the base 3d by a predetermined distance or more, and the rotor 3f, the rotor 6f, the hub 3g, and the hub 6g move the recording medium 41 to adversely affect normal recording, reproduction, erasing, or the like. 3f or rotor 6f
May contact and damage the carriage 5b of the head moving mechanism unit 5, but in the case of the outer rotor type motor 6, as shown in FIG. 6, the rotor disengagement prevention unit 4h of the slide cam 4c prevents the rotor 6f from moving. The movement amount is within a predetermined range (the distance between the upper surface of the rotor 6f and the lower surface of the carriage portion 5b when there is no movement amount of the rotor 6f is A, the rotor 6f and the protrusion 4).
When the distance from i is B, the relation of A> B is regulated, so that the carriage portion 5b can be prevented from being damaged, and the protrusion 4i comes into point contact with the rotor 6f to hinder the smooth rotation of the rotor 6f. Can be prevented. Further, the recording medium 41 is arranged within a range where there is no problem in recording, reproducing and erasing, and it does not obstruct the normal rotation drive. still,
In the case of the inner rotor type motor 3, the rotor disengagement prevention piece 3m of the stator cover 3l has the same action and effect as above. In this case, the rotor removal prevention piece 3m
Restricts the movement of the rotor magnet 3h to prevent the rotor from coming off.

To eject the magnetic disk 40, when the switch portion 4g is pushed in, the slide cam 4c pushes up the protrusion 4b (moves away from the bottom plate portion 2a) to move the holder 4a, and the slide cam 4c moves to the lever. It is locked by 4d, and the holder remains in the attachment / detachment position. A proper amount of the magnetic disk 40 is ejected from the holder 4a by the lever 4d. Also during this discharge, the rotor slip-off prevention unit 4
h, the rotor slip-off preventing piece 3m releases the holding of the magnetic disk 40 against the chucking force of the hub 6g and the hub 3g. Therefore, when the magnetic disk 40 moves, the rotating shaft 6
a, the tip of the rotating shaft 3a is prevented from being caught, and the unloading operation of the magnetic disk 40 is facilitated. FIG.
As shown in FIG. 5, the moving amount of the rotor 6f attached to the rotating shaft 6a via the hub 6g is within a predetermined range (the distance between the upper surface of the rotor 6f and the protrusion 4i at a position where the rotor 6f does not move is B, and the holder 4a is When the distance between the lower surface of the magnetic disk 40 held by and the tip of the rotating shaft 6a at a position where the rotor 6f does not move is C, the relation of B <C is satisfied. It does not interfere with the unloading operation of the magnetic disk 40. Further, even during loading, the loading operation is not disturbed. In the case of the inner rotor type motor 3, the rotor slip-off preventing piece 3m of the stator cover 3l has the same action and effect as above. In this case, the rotor removal prevention piece 3m prevents the removal by restricting the movement of the rotor magnet 3h.

Since the flexible magnetic disk device shown in the first embodiment is constructed as described above, it has the following effects. Since the inner rotor type motor 3 is divided into a portion to be directly attached to the frame 2 of the apparatus body and a portion to be attached to the electric wiring processed base 3d, both of which are attached to the frame 2 to function as a motor. It is not necessary to form a hole having a size that impairs the rigidity of the frame 2, and it is possible to mount both the outer rotor type motor and the inner rotor type motor while ensuring frame rigidity and preventing frame distortion.

Further, the rotating shaft 3a and the bearing 3b of the inner rotor type motor 3 are made long so that the distance between the base 3d surface and the hub 3g surface is equal to the distance between the base 6d surface and the hub 6g surface. With such a structure, the fixed portion 2c can be shared and used.

Since the base fixing portion 2c for fixing the bases 3d and 6d is formed by drawing, it is possible to prevent the base fixing portion 2c from being slightly deformed and to improve the chucking accuracy in the outer rotor type motor. In the case of the type motor, it is possible to further prevent the adverse effect on the motor characteristics and improve the reliability of the flexible magnetic disk device.

The base fixing portion 2c for fixing the bases 3d and 6d is formed by drawing a rectangular portion having a long side in the direction along the circumference of the hole 2b or in the direction orthogonal to the radial direction of the rotation axis. Therefore, as the dimension to be projected downward, the long side portion around the hole can be used, and it is possible to prevent the flexible magnetic disk device from increasing in the width direction without swelling in the width direction.

Further, since the long side is formed by punching out a rectangular long hole and is drawn in the rectangular portion, it is easy to draw, the dimensional accuracy can be easily obtained, and further, the frame bottom plate portion 2a. Since the strain applied to the device can be reduced, the reliability can be further improved. Further, since the drawing portion has at least two opposite sides narrowed from the bottom plate portion 2a, the drawing portion (fixing portion 2) during assembly or the like.
It is possible to prevent minute deformation of c).

Further, when the inner rotor type motor 3 is mounted, the mounting portions 2f for mounting the stator 3i and the like and the fixed portions 2c are alternately provided around the hole 2b at a substantially equal distance from the rotating shaft 3a. Since the stator 3i side and the rotor 3f side are attached to the frame 2 in a well-balanced manner, it becomes easy to arrange the motors at desired dimensional intervals.

When the outer rotor type motor 6 is mounted, the rotor slip-off prevention portion 4h provided on the slide cam 4e.
However, the moving range of the rotor 6f is set by the rotor 6f
Since it can be restricted to a range where it does not contact b and a range where the tip of the rotating shaft 6a does not contact the magnetic disk 40 when the holder 4a is in the attachment / detachment position, the rotor 6f and the hub 6g move relative to the recording medium 41. Head 5
a does not impair the contact property of a, and the carriage portion 5b
Of the magnetic disk 40 can be prevented, the insertion and ejection operations of the magnetic disk 40 can be smoothly performed, and the rotor 6f is in point contact with the rotor 6f so that the influence on the rotation can be reduced and the reliability of recording, reproducing, erasing, etc. can be ensured. .

When the inner rotor type motor 3 is mounted, the rotor slip-off preventing piece 3m can similarly regulate the moving range of the rotor 3f, so that the head 5a relative to the recording medium 41 by the movement of the rotor 3f and the hub 3g. The contactability is not impaired, the carriage portion 5b can be prevented from being damaged, the magnetic disk 40 can be smoothly inserted and ejected, and the rotor 3f can be point-contacted to reduce the influence on the rotation. It is possible to secure reliability such as erasing. Further, even if the flexible magnetic disk device that uses any of the rotor slip-out preventing portions is placed vertically (the side surface is on the lower side), the reliability can be secured similarly.

[0050]

According to the first aspect of the present invention, the bottom part has a hole through which the rotating part can be inserted, the first fixing part for fixing the stator, and the bottom part of the bottom part formed by drawing to fix the base. The second fixing portion formed on the lower side is fixed to a frame which houses or mounts the disk moving means and the head moving means on the upper side of the bottom surface portion, and the stator is fixed to the first fixing portion from the upper side of the bottom surface portion. , With the bearing facing the bottom side, the second base
Since the rotor magnet and the teeth portion were opposed to each other on the upper side of the bottom surface portion, it was not necessary to make a hole of a size that would impair the rigidity of the frame, ensuring frame rigidity,
Frame distortion can be prevented, and since the second fixing portion is formed by drawing, minute deformation can be prevented.

According to the invention described in claim 2, in addition to the invention described in claim 1, since the second fixed portion is formed by drawing a rectangular portion having a long side in a direction orthogonal to the radial direction of the rotating shaft, It is possible to prevent the narrowed portion from bulging in the radial direction of the rotating shaft, and suppress an increase in the width direction of the flexible magnetic disk device.

According to a third aspect of the present invention, in addition to the invention according to the second aspect, the second fixing portion is a rectangular portion in which the long side portion is cut out from the bottom surface portion and the short side portion is connected to the bottom surface portion. Since it is formed by drawing, it is easy to draw, dimensional accuracy can be easily obtained, and distortion given to the frame can be reduced, so that reliability can be further improved.

In the invention described in claim 4, in addition to the invention described in claim 1, the first fixing portion and the second fixing portion are alternately arranged along the circumference of the hole portion at substantially equal intervals. Therefore, it can be easily mounted with a desired mounting accuracy.

According to a fifth aspect of the present invention, the base portion is fixed to the fixing portion formed on the lower side of the bottom surface portion by drawing, and the bearing is fixed toward the bottom surface side, and the hub portion is arranged above the bottom surface portion. Therefore, the chucking accuracy between the hub portion and the magnetic medium can be improved.

According to the invention described in claim 6, in addition to the invention described in claim 5, since the fixed portion is formed by drawing a rectangular portion having a long side in a direction orthogonal to the radial direction of the rotation axis, the drawn portion is It is possible to prevent the rotary shaft from expanding in the radial direction, and suppress an increase in the width direction of the flexible magnetic disk device.

According to a seventh aspect of the present invention, in addition to the sixth aspect of the invention, the fixed portion is formed by cutting out the long side portion from the bottom surface portion and drawing the rectangular portion whose short side portion is connected to the bottom surface portion. Since it is formed by doing so, it is easy to draw, the dimensional accuracy can be easily obtained, and the distortion given to the frame can be reduced, so that the reliability can be further improved.

According to an eighth aspect of the present invention, in addition to the fifth aspect, the disc moving means is provided with a regulating means for regulating the movement of the rotor in the axial direction of the rotating shaft. It is possible to prevent the contact of the head with respect to the head from being damaged, to prevent damage to the head moving portion, and to smoothly insert and eject the magnetic disk.

According to a ninth aspect of the present invention, in addition to the eighth aspect of the invention, the disk moving means includes a holder portion for detachably holding a magnetic disk, and a holder portion and a cam portion arranged above the rotor. A holder moving part for contacting and moving the holder part between the loading position and the attaching / detaching position and a protrusion provided in point contact with the rotor and provided on the holder moving part for regulating the movement of the rotor in the axial direction of the rotating shaft. Since it has a means, the contactability of the head to the recording medium due to the movement of the rotor is not impaired, the head moving part can be prevented from being damaged, the magnetic disk insertion and ejection operations can be smoothly performed, and the point contact with the rotor can be made. Therefore, the influence on the rotation of the rotor can be reduced and the reliability of recording, reproducing, erasing, etc. can be secured.

[Brief description of drawings]

FIG. 1 is an overall view of a flexible magnetic disk device showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the flexible magnetic disk device according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view of a flexible magnetic disk device according to an embodiment of the present invention.

FIG. 4 is an enlarged view taken along arrow A in FIGS. 2 and 3.

5 is a sectional view of the motor shown in FIG.

FIG. 6 is a detailed view of a rotor slip-out prevention portion of the outer rotor type motor.

FIG. 7 is a positional relationship diagram between a solid base portion and a stator mounting portion provided on the frame.

FIG. 8 is an overall view showing a conventional flexible magnetic disk device (equipped with an outer rotor type motor).

FIG. 9 is an exploded perspective view of a conventional flexible magnetic disk device (equipped with an outer rotor type motor).

FIG. 10 is a cross-sectional view of an outer rotor type motor.

FIG. 11 is an overall view showing a conventional flexible magnetic disk device (with an inner rotor type motor mounted).

FIG. 12 is an exploded perspective view of a conventional flexible magnetic disk device (equipped with an inner rotor type motor).

FIG. 13 is a sectional view of an inner rotor type motor.

[Explanation of symbols]

 1a Flexible magnetic disk device 1b Flexible magnetic disk device 2 Frame 2c Base fixing part 3 Inner rotor type motor 4h Rotor slip-out prevention part 6 Outer rotor type motor

Claims (9)

[Claims] 1. A disk moving means for arranging a magnetic disk at a loading position for recording / reproducing and a mounting / demounting position for mounting / dismounting, a magnetic head for recording / reproducing in contact with the magnetic disk, and the magnetic head for the magnetic disk. A head moving means arranged on a desired track of the disk, a rotating shaft and a hub portion having a chucking portion for holding the magnetic disk at the loading position, and a hub portion fixed to the rotating shaft and the rotation portion fixed to the hub portion. A rotating portion having an annular rotor that rotates about an axis and an annular rotor magnet that is fixed around the rotor, a bearing that supports the rotating shaft, a base portion that fixes the bearing, and the rotor magnet. Rotating means for rotating the magnetic disk, which has a stator having teeth portions arranged at a predetermined interval and facing each other, and the rotating portion can be inserted into the bottom surface portion. The disk moving means includes a hole, a first fixing portion for fixing the stator, and a second fixing portion formed under the bottom surface by drawing for fixing the base portion. A frame for accommodating or mounting the head moving means on the upper side of the bottom surface portion, fixing the stator to the first fixing portion from the upper side of the bottom surface portion, and directing the bearing toward the bottom surface side. A flexible magnetic disk device, characterized in that a portion is fixed to the second fixing portion, and the rotor magnet and the teeth portion are opposed to each other above the bottom surface portion. 2. The flexible magnetic disk according to claim 1, wherein the second fixed portion is formed by drawing a rectangular portion having a long side in a direction orthogonal to the radial direction of the rotating shaft. apparatus. 3. The second fixing portion is formed by cutting a long side portion from the bottom surface portion and drawing a rectangular portion whose short side portion is connected to the bottom surface portion. The flexible magnetic disk device according to claim 2. 4. The flexible structure according to claim 1, wherein the first fixing portion and the second fixing portion are alternately arranged at substantially equal intervals along the circumference of the hole. Magnetic disk device. 5. A disk moving means for arranging a magnetic disk at a loading position for recording / reproducing and a mounting / demounting position for mounting / discharging, a magnetic head for recording / reproducing in contact with the magnetic disk, and the magnetic head for driving the magnetic disk. A head moving means arranged on a desired track of the disk, a rotating shaft and a hub portion having a chucking portion for holding the magnetic disk at the loading position, and a hub portion fixed to the rotating shaft and the rotation portion fixed to the hub portion. A rotating portion having an annular rotor that rotates about an axis and an annular rotor magnet that is fixed around the rotor, a bearing that supports the rotating shaft, a base portion that fixes the bearing, and the rotor magnet. Rotating means for rotating the magnetic disk, which has a stator having teeth portions arranged at a predetermined interval and facing each other, and the rotating portion can be inserted into the bottom surface portion. A frame that has a fixing portion formed on the lower side of the bottom surface portion by drawing to fix the hole portion and the base portion, and stores or attaches the disk moving means and the head moving means above the bottom surface portion. A flexible magnetic disk device comprising: a base unit, the base unit being fixed to the fixing unit with the bearing facing the bottom face side, and the hub unit being arranged above the bottom face unit. 6. The flexible magnetic disk drive according to claim 5, wherein the fixed portion is formed by drawing a rectangular portion having a long side in a direction orthogonal to the radial direction of the rotating shaft. 7. The fixing portion is formed by cutting a long side portion from a bottom surface portion and drawing a rectangular portion whose short side portion is connected to the bottom surface portion. 6. A flexible magnetic disk drive according to claim 6. 8. A flexible magnetic disk drive according to claim 5, wherein the disk moving means is provided with a restricting means for restricting movement of the rotor in the axial direction of the rotary shaft. 9. A disk moving means is provided with a holder part for detachably holding a magnetic disk, and is arranged on the upper side of a rotor and engaged with the holder part by a cam part to move the holder part between a loading position and a mounting position. 9. A holder moving part and a restricting means provided in the holder moving part for contacting the rotor point and restricting the movement of the rotor in the axial direction of the rotary shaft. A flexible magnetic disk device according to the item.