JPH0630953U - Disk device - Google Patents

Abstract

(57) [Summary] [Object] To reduce the size of the device in the head carriage movement direction for a disc device that performs recording and reproduction by moving the head carriage in the radial direction of the disc. The motor 30 includes a stator 31 fixed to the head carriage 25 and a cylindrical rotor 32 disposed inside the stator 31 in a state of being axially regulated.
And consists of. The lead screw 24 penetrates through the rotor 32 and is fixed to the main body of the device 21. The engaging portion 33 engages with the lead screw 24 and rotates integrally with the rotor 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk device, and more particularly to a disk device for moving a head carriage in a radial direction of a disk for recording / reproducing.

[0002]

[Prior art]

 FIG. 7 is a diagram showing an example of a conventional floppy disk device, and FIG. 8 is a perspective view of a main part of the floppy disk device shown in FIG. Hereinafter, description will be given based on both figures.

In a floppy disk device 1 shown in FIG. 7, a magnetic disk 3 of a floppy disk 2 inserted from the lower side in the figure is rotationally driven by a spindle motor 4, and a head carriage 5 is moved in the directions of arrows A ₁ -A _2. The magnetic head 6 disposed on the head carriage 5 performs magnetic recording / reproduction at a predetermined position on the magnetic disk 3.

The floppy disk 2 has a shutter (not shown). The shutter is closed when it is not installed, but when the floppy disk 2 is installed in the apparatus, it opens to form a shutter opening 7, and a magnetic head is formed. 6 enables recording / reproduction on the magnetic disk 3.

The head carriage 5 shown in FIGS. 7 and 8 is formed with a protruding engaging portion 8 having a wedge-shaped cross section, and is provided with a leaf spring 9. The engaging portion 8 has a wedge-like shape. The lead screw 11 is engaged with the engaging portion 8 by the spring force of the leaf spring 9 in a state in which the lead screw 11 fixed to the rotating shaft of the stepping motor 10 is engaged with the groove formed in a spiral shape. It is clamped by the leaf spring 9.

One end of the lead screw 11 is axially supported by a shaft supporting portion 12 fixed to the main body of the apparatus, and is rotatable in a direction of arrow C ₁ -C ₂ by a bearing arranged in the shaft supporting portion 12. Further, a partition wall 16 is disposed on the upper part of the apparatus main body in FIG. 7, and the other end of the lead screen 11 is rigidly coupled to a rotating permanent magnet (not shown) of the stepping motor 10 fixed to the partition wall 16.

Guide portions 13a and 13b are formed on the head carriage 5 so as to project therefrom, and a rod-shaped guide rail 14 fixed to the apparatus main body is inserted through holes formed in the guide portions 13a and 13b. Therefore, by driving the stepping motor 10 to rotate in a predetermined direction by a predetermined angle, the head carriage 5 is guided by the guide rails 14 and _{one of} the arrows A ₁ -A ₂ is indicated according to the rotation direction of the stepping motor 10. It moves in the direction by a distance corresponding to the rotation angle of the stepping motor 10.

[0008]

[Problems to be solved by the device]

However, according to the conventional disk device configured as described above, as shown in FIG. 7, the stepping motor 10 for rotating the lead screw 11 is arranged above the head carriage 5 in the figure. Accordingly, the depth dimension of the apparatus in the vertical direction in the figure is approximately the dimension L _{1 of} the floppy disk 2 in the vertical direction in the figure and the length L ₂ of the lead screw 11 plus the axial dimension L ₃ of the stepping motor 10. However, there is a problem that the depth dimension of the device, which is the dimension in the head carriage movement direction, cannot be reduced.

In view of the above points, it is an object of the present invention to provide a disk device capable of reducing the size of the device in the head carriage movement direction.

[0010]

[Means for Solving the Problems]

 The above problem can be solved by configuring as follows.

That is, the head cartridge is provided on the main body of the apparatus so as to be movable in the radial direction of the disk, and the head is mounted on the head carriage, and the head performs recording / reproduction at a predetermined position of the disk. In the device, the stator is fixed to the head carriage by the outer stator and the cylindrical rotor disposed inside the stator in a positionally regulated manner in the axial direction. A lead screw that is fixedly attached to the main body of the device and an engaging portion that rotates integrally with the rotor and engages with the lead screw, and the engaging portion is the shaft of the lead screw according to the rotation of the rotor. And the head carriage is configured to move with the motor.

[0012]

[Action]

 According to the above structure, the lead screw is provided so as to be fixed to the main body of the apparatus by penetrating the inside of the cylindrical rotor, and the engaging portion that rotates integrally with the rotor and engages with the lead screw is provided. For example, since the engaging portion is engaged with the groove provided on the lead screw, when the rotor rotates, the rotor moves in the axial direction of the lead screw. Further, according to the configuration in which the outer stator is fixed to the head carriage, and the rotor is arranged inside the stator in a positionally restricted axial direction, the rotor moves in the axial direction of the lead screw and the stator moves. Also moves in the axial direction of the lead screw, and acts to move the head carriage in the axial direction of the lead screw. Further, according to the configuration in which the lead screw is provided so as to penetrate through the rotor, the motor acts so as to be disposed within the range of the length of the lead screw.

[0013]

【Example】

 1 is a view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part taken along the line II-II 'in FIG. 1, FIG. 3 is an exploded perspective view of the main part of FIG. 1, and FIG. 9 is a perspective view of the main part of FIG. 7, in which the same components as those in FIGS. 7 and 8 are designated by the same reference numerals. An embodiment of the present invention will be described below with reference to the drawings.

In a floppy disk device 21 shown in FIG. 1, a magnetic disk 3 of a floppy disk 2 inserted from below in the drawing is rotationally driven by a spindle motor 4 to move a head carriage 25 in the directions of arrows A ₁ -A _2. Then, magnetic recording / reproduction is performed at a predetermined position on the magnetic disk 3 by the magnetic head 6 arranged on the head carriage 25.

Guide portions 23a and 23b are formed on the head carriage 25 so as to project therefrom, and rod-shaped guide rails 14 fixed to the apparatus main body are inserted into holes formed in the guide portions 23a and 23b, respectively. .

A stepping motor 30 is fixedly provided on the head carriage 25, while a lead screw 24 having a spiral groove is fixed to the main body of the apparatus at one end and to the main body of the apparatus at the other end. It is supported by the supported support portion 22 and is parallel to the guide rail 14.

The stepping motor 30 is generally composed of a stator 31 and a rotor 32. The cylindrical rotor 32 rotates inside the stator 31 fixed to the head carriage 25, and is disposed on the inner peripheral surface of the rotor 32. The joining portion 33 is configured to engage with the groove of the lead screw 24 inserted into the stepping motor 30 so as to penetrate the rotor 32.

That is, the stepping motor 30 is a so-called claw pole PM (Permanent Magnet) type stepping motor. As shown in FIGS. 3 and 4, the stator 31 has a bobbin 34 around which a multi-phase exciting coil 35 is wound. On the inner peripheral surface of the bobbin 34, comb teeth-shaped claw poles (magnetic pole teeth) 36 are integrally formed in multiple phases. The stepping motor 30 is supported by a motor holder 26, which will be described next, and is arranged at a position closer to the rear edge of the right side portion of the head carriage 25.

A motor holder 26 for holding the bobbin 34 is formed on the right side of the head carriage 25 so that the trailing edges of the carriage 25 and the motor holder 26 are aligned with each other. Has holes 27a and 27b for inserting the lead screw 24 therethrough.

Then, exciting currents having different phases are applied to the multi-phase exciting coil 35 via an FPC (Flexible Printed Circuit Board) which is not shown in FIGS. By generating magnetism, the inside of the bobbin 34 has a magnetic flux distribution according to the exciting current.

The rotor 32 is formed into a cylindrical shape as described above, and an engaging portion (not shown) is collectively formed on the inner peripheral surface of the rotor 32. The rotor 32 is a permanent magnet made of resin that is magnetized in multiple poles in the radial direction. A magnet, which is housed inside the bobbin 34 and magnetically coupled to the stator 31. Further, thrust washers 37a and 37b are disposed on both axial sides of the rotor 32 housed inside the bobbin 34, and the sum of the axial dimensions of these is set to be slightly smaller than the axial dimension of the bobbin 34. There is.

The bobbin 34 in a state where the rotor 32 and the thrust washers 37a and 37b are housed inside at once is fixed by being press-fitted or adhered to the groove portions 28a and 28b formed in the motor holder 26 shown in FIG. At this time, the axial position of the rotor 32 is regulated to be substantially constant with respect to the head carriage 25. Further, at this time, the stator 31 is arranged so that the line connecting the centers of the holes 27a and 27b formed in the motor holder 26 of the head carriage 25 and the claw pole 36 formed inside the bobbin 34 are coaxial. Positioned.

In this state, the lead screw 24 is housed inside the bobbin 34 as shown in FIG. 4 so that the engaging portion of the rotor 32 engages with the groove formed in the lead screw 24 as described later in detail. The rotor (32), the thrust washer (37a, 37b) and the hole (27a, 27b) of the motor holder 26 are inserted. Therefore, the coaxiality between the claw pole 36 and the lead screw 24 is secured.

As shown in the drawing, flat portions 24a and 24b parallel to each other are formed on both diametrical surfaces of one end of the lead screw 24, and an unillustrated locking portion for locking the flat portions 24a and 24b is provided on the apparatus body. The lead screw 24 is fixed in the radial direction and does not rotate.

Further, the other end of the lead screw 24 is supported by a supporting portion (22) fixedly provided on the apparatus main body and shown in FIG. 1, and both ends thereof are locked by the locking portion or the supporting portion. Alternatively, by being supported, the lead screw 24 is fixed in the axial direction and does not move.

As shown in the cross-sectional view of FIG. 2, a spirally continuous groove 24 a is formed on the outer periphery of the lead screw 24, and the lead screw 24 is arranged so as to penetrate the rotor 32. An engagement portion 33 protruding in a trapezoidal shape is formed on the inner peripheral surface of the rotor 32, and the engagement portion 33 engages with the groove 24a to screw-connect the rotor 32 and the lead screw 24. Although not shown in the drawing, three engaging portions 33 are formed along the spiral groove 24a at intervals corresponding to a circumferential angle of 120 ° on the circumference of the lead screw 24.

When a predetermined exciting current is supplied to the exciting coil 35 from a drive circuit (not shown) through the FPC 38, a magnetic field corresponding to the exciting current is generated inside the stator 31 and magnetically coupled to the stator 31. The suction force acts on the rotor 32, so that the rotor 32 rotates.

The inner diameter and the outer diameter of the rotor 32 and the thrust washers 37 a and 37 b are such that their inner peripheral surfaces are slightly separated from the outer peripheral surface of the lead screw 24, and their outer peripheral surfaces are inside the bobbin 34. It is sized so as to be slightly separated from the peripheral surface, so that when the rotor 32 rotates, an air gap is formed between the claw pole (not shown) formed inside the bobbin 34 and the rotor 32. It is configured.

The dimensional accuracy of the air gap is ensured by the configuration that secures the coaxiality between the claw pole (36) and the lead screw 24 described above and the screw connection between the rotor 32 and the lead screw 24, and the dimensional accuracy of the air gap is secured. And claw pole positioning is done.

With the above configuration, when the rotor 32 is driven to rotate in a predetermined direction by a predetermined angle in accordance with the exciting current, the engaging portion 33 remains engaged with the groove 24 a of the lead screw 24 fixed to the apparatus body. It rotates integrally with the rotor 32. However, the lead screw 24 is fixed to the main body of the apparatus and the groove 24a is fixed.

Therefore, the rotational force of the rotor 32 is a force that the axial end surface of the rotor 32 presses the motor holder 26 in the axial direction of the lead screw 24 via the thrust washers 37 a and 37 b. At this time, the backlash generated between the engaging portion 33 and the groove 24a is absorbed by the thrust washers 37a and 37b, and the play in the axial direction is suppressed.

As a result, the head carriage 25 is guided by the guide rails (14) and moves in any direction (arrow A ₁ -A ₂ direction) of the axial direction of the lead screw 24 depending on the rotation direction of the rotor 31. It is possible to perform magnetic recording / reproduction at a predetermined position on the magnetic disk by moving a distance corresponding to the rotation angle of 31.

According to the present embodiment, since the stepping motor 30 is provided so that the lead screw 24 penetrates the rotor 31 within the range of the length of the lead screw 24, the lead screw which is the moving direction of the head carriage 25. The dimension of 24 in the axial direction, that is, the depth direction of the apparatus can be made smaller than that of the conventional apparatus by the dimension L _{3 in} the axial direction of the stepping motor.

That is, the size of the device in the depth direction can be reduced to approximately (the sum of the size L _{1 of the} floppy disk 2 in the vertical direction in FIG. ₁ and the length L ₂ of the lead screw 24). Further, since the head carriage 25 is configured to be supported by the guide rail 14 and the lead screw 24 which are parallel to each other, parts such as the leaf spring (9) which are conventionally required are unnecessary.

Next, FIG. 5 is a diagram showing a main part of another embodiment of the present invention, (A) is a front view, (B) is a partially disassembled side view, and (C) is FIG. FIG. 9A is a cross-sectional view taken along the line CC ′ of FIG. In the figure, the same components as those in FIGS. 1 to 4 are designated by the same reference numerals.

The head carriage 25 shown in FIG. 5 is supported in parallel with each other by the guide rails 14 and lead screws 24 fixed to the apparatus main body and moves in the radial direction of the disk, and the stepping motor moves the length of the lead screw 24. The structure provided within the range is approximately the same as that described above.

That is, the stepping motor 30 is supported by the upper holder 40 and the lower holder 41 formed on the head carriage 25, and an exciting current is supplied from the FPC 38 to the exciting coil 35 fixed to the upper holder 40 and the lower holder 41. , The rotor 32 rotates. A resin sleeve 44 is fixed to the inside of the rotor 32 by, for example, adhesion, press fitting, or the like.

Further, the lower holder 41 is formed with a supporting portion 42 protruding to support the lead screw 24, and the lead screw 24 is clamped from above the supporting portion 42 by the spring force of the pressing spring 43. ing.

As shown in FIG. 6, the sleeve 44 is composed of a substantially thin cylindrical portion 45 and a thick annular portion 46. The outer peripheral surface of the cylindrical portion 45 has a columnar shape and is closely adhered and fixed to the inner peripheral surface of the rotor (32). Inverted V-shaped projections 47a, 47b, 47c are formed on the same circumference on the outer side of the annular portion 46, and substantially semicircular depressions 50a, 50b, 50c are formed between the projections. . As shown in FIG. 6C, spherical steel balls 51a, 51b, 51c can be arranged in these recesses.

The inner peripheral surfaces of the cylindrical portion 45 and the annular portion 46 are in the shape of a continuous column, and the engaging portions 48a, 48b, 48c and the supporting portions 49a, 49b, 49c are formed on the inner peripheral surface so as to project. There is. The engaging portions 48a, 48b, 48c are spirally scattered as shown in the drawing so as to engage with the grooves (24a) spirally formed on the lead screw (24) and have a circumferential angle of 120 °. It is formed at intervals.

The support portions 49a, 49b, 49c contact the outer peripheral surface of the lead screw 24 at the left end portion of the sleeve 44 in FIG. 5 (C) and set the axial center position of the lead screw 24 at a constant position. As shown in FIG. 6, they are formed so as to be circumferentially scattered at intervals corresponding to a circumferential angle of 120 ° so as to be supported.

In the present embodiment, the balls 51a (51b, 51c) arranged in the recesses 50a, 50b, 50c formed on the outer periphery of the annular portion 46 have the upper holder 40 and the lower holder as shown in FIG. 6B. The V-shaped grooves 40a and 40b (see FIG. 5) formed on the shaft 41 function as bearings, and the sleeve 44 can rotate smoothly.

Therefore, when the sleeve 44 rotates integrally with the rotor 32, the sleeve 44 engages with the fixed groove 24a as in the above-described embodiment, so that the sleeve 44 rotates. Of the upper holder 40 and the lower holder 41 through the grooves 40a, 40b while rotating with the rotor 32 while the protrusions 47a, 47b, 47c rotate in the axial direction of the lead screw 24. To move the head carriage 25.

According to this embodiment, since the stepping motor is provided within the range of the length of the lead screw 24, it is possible to reduce the size of the device in the depth direction as in the above embodiment. Further, the sleeve 44 may be configured to rotate without using the balls 51a, 51b, 51c while the protrusions 47a, 47b, 47c are directly engaged with the grooves 40a, 40b.

In each of the above-described embodiments, the engaging portion is formed in a trapezoidal shape, but engages with the groove of the lead screw fixed to the main body of the apparatus to rotate the rotor to move the head carriage to the lead screw. It is only necessary to be able to move in the axial direction, and it is of course possible to form a spirally continuous thread that is screwed into the groove of the lead screw.

[0046]

[Effect of device]

 As described above, according to the present invention, when the rotor rotates, the rotor moves in the axial direction of the lead screw and the stator also moves in the axial direction of the lead screw to move the head carriage in the axial direction of the lead screw. Since the motor is installed within the range of the length of the lead screw and does not protrude beyond the length of the lead screw, the dimension of the disk drive in the head carriage movement direction should be made smaller than the conventional dimension by the axial dimension of the motor. It has the feature of being able to.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a main part of an embodiment of the present invention.

FIG. 4 is a perspective view of an essential part of an embodiment of the present invention.

FIG. 5 is a view showing a main part of another embodiment of the present invention.

FIG. 6 is a view showing a sleeve according to another embodiment of the present invention.

FIG. 7 is a diagram showing an example of a conventional disk device.

FIG. 8 is a perspective view of a main part of an example of a conventional disk device.

[Explanation of symbols]

 1, 21 Floppy disk device (disk device) 3 Magnetic disk (disk) 5,25 Head carriage 6 Magnetic head (head) 11, 24 Lead screw 10, 30 Stepping motor (motor) 31 Stator 32 Rotor 33, 48a, 48b, 48c engaging part 44 sleeve

Claims (1)

[Scope of utility model registration request] 1. A head carriage provided on the main body of the apparatus so as to be movable in the radial direction of the disk, and a head mounted on the head carriage for recording / reproducing at a predetermined position of the disk. In the disk device to be performed, an outer stator and a cylindrical rotor disposed inside the stator in a state of being axially regulated, and a motor having the stator fixed to the head carriage, A lead screw that penetrates through the rotor and is fixed to the apparatus main body, and an engaging portion that rotates integrally with the rotor and engages with the lead screw are provided. The disk device configured such that the engaging portion is moved in the axial direction of the lead screw so that the head carriage moves together with the motor.