JPH11273275A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the easy mounting of a guide sub-shaft on a chassis. SOLUTION: The end part 115b of the guide sub-shaft 115 in the side of the inserting direction, which is inserted from a through-hole 151 arranged at one end of a yoke mounting base 142, is inserted into a blind hole 152 of the yoke mounting base 142 and inserted inside the side wall part 41c of the chassis 41 when the yoke mounting base 142 is fastened with screws on the chassis 41, then the fall-off of the guide sub-shaft 115 from the blind hole 152 of the yoke mounting base 142 is prevented by this side wall part 41c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a disk drive device most suitable for applying to a floppy disk drive for recording and / or reproducing a disk-shaped recording medium such as a floppy disk. , And belongs to the technical field of a device for mounting a carriage guide shaft.

[0002]

2. Description of the Related Art Conventionally, in a floppy disk drive as an example of a disk drive device, as shown in FIG. 21, a guide main shaft 114 and a guide sub shaft 115 for guiding a carriage 111 for transferring a magnetic head are provided on a chassis 41. , A total of four positioning references 161 are formed on the chassis 41 and a total of four screws 1
The guide main shaft 114 and the guide sub shaft 11 are formed by a total of four holding plates 163 screwed on the chassis 41 by the guide 62.
5 was fixed on the chassis 41 such that both front and rear ends (both ends in the axial direction) were pressed against a total of four positioning references 161.

[0003]

Therefore, the conventional guide spindle and guide spindle mounting apparatus have problems that the number of parts and the number of assembly steps are large, the cost is high, and the productivity is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is intended to allow a guide sub shaft to be easily attached to a chassis.

[0005]

According to the present invention, there is provided a disk drive apparatus comprising: a yoke mount for mounting a yoke of a voice coil motor for transferring a head transfer carriage to a chassis; The mounting base is also used.

In the disk drive device of the present invention constructed as described above, the yoke mounting base also serves as the mounting base for the guide sub-shaft, so that one yoke mounting base guides the yoke of the voice coil motor and the carriage. The two parts with the countershaft can be mounted on the chassis at the same time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of a large-capacity floppy disk cartridge and a large-capacity floppy disk drive to which the present invention is applied are compared with existing small-capacity floppy disk cartridges and small-capacity floppy disk drives. The description will be made in the following order. (1) ・ ・ ・ Description of small capacity floppy disk cartridge and small capacity floppy disk drive device (2) ・ ・ ・ Description of large capacity floppy disk cartridge (3) ・ ・ ・ Overview of large capacity floppy disk drive (4) ・ ・ ・ Description of linear actuator (5) ・ ・ ・ Description of mounting device for guide spindle (6) ・ ・ ・ Description of mounting device for guide sub shaft and yoke (7) ・ ・ ・ Guide main shaft and guide sub Description of shaft bearing device (8) ・ ・ ・ Description of head assembly (9) ・ ・ ・ Description of soft loading device (10) ・ ・ Description of tracking scale (11) ・ ・ Description of tracking servo (12) ・・ Explanation of dust shield device (13) ・ ・ Explanation of floppy disk cleaning device

(1)... Small-capacity floppy disk
Description of Cartridge and Small Capacity Disk Drive First, as shown in FIGS. 67 to 71, a floppy disk 1 made of a magnetic sheet having a diameter of 3.5 inches is placed around a center core 2 which is a disk made of a stainless steel plate. A small-capacity floppy disk cartridge FDC using a small-capacity floppy disk having a bonded structure has a recording capacity of the floppy disk 1 of 1 to 2 MB (megabytes).
Of small capacity. The small-capacity floppy disk cartridge FDC forms a flat, substantially rectangular cartridge 5 by upper and lower shells 3 and 4 formed of a synthetic resin. doing.

At this time, the center core 2 of the floppy disk 1 is loosely fitted in the center core hole 6 formed in the center of the lower shell 4, and the cartridge 5 indicated by an arrow a in the small capacity floppy disk drive described later. The upper and lower shells 3 and 4 have a cartridge center P ₁ between the front end face 5 a which is the end in the insertion direction side and the center core hole 6.
And a pair of upper and lower head insertion holes 7 in the shape of a long hole along the line. To open and close the pair of upper and lower head insertion holes 7, a shutter 8 having a U-shaped cross section formed by a pair of upper and lower horizontal plate portions 8a and 8b and a front end vertical plate portion 8c is provided. The shutter 8 is slidably disposed in a shutter slide recess 18 formed substantially in a U-shape outside the front end 5a and the front end 5a, and the shutter 8 is in the insertion direction along the front end face 5a. Arrow c which is a direction perpendicular to the direction of arrow a,
It is slidably mounted in the d direction. The shutter 8 is slid in the direction of arrow c to the closed position by a built-in shutter spring 8d.
The lower shell 4 of the cartridge 5 has a front end face 5
A pair of right and left positioning reference holes 9 each composed of a perfect circular hole and an oval hole are formed at a position deviated to the side a. A pair of left and right semicircular concave portions 10 is formed at a position close to the front end face 5a side of the fourth. The upper and lower shells 3 and 4 as a whole are placed at a corner 11a between the front end face 5a of the cartridge 5 and the right side face 5b as one side face.
A slope 12 for preventing erroneous insertion, which is a so-called C-plane cut at 5 °, is formed. A write protector 13 for preventing erroneous erasure is incorporated in a corner 11b between the rear end face 5d of the cartridge 5 and the left side face 5c as the other side face, and the rear end face 5d and one side face, the right side face, are provided. A capacitor identification hole 14 is formed in a corner 11c with the hole 5b.

A pair of upper and lower cleaning sheets 15, which are non-woven fabrics cut into a substantially horseshoe shape, are laid on the inner wall surfaces 3b, 4b of the upper and lower shells 3, 4 by bonding or the like. A lifter 16 for making the sheet 15 elastically contact the upper and lower surfaces of the floppy disk 1 from above and below is attached to one (or both) of the upper and lower shells 3 and 4 by bonding or the like. Accordingly, the floppy disk 1 is configured to be sandwiched from above and below between a pair of upper and lower cleaning sheets 15 and to be rotationally driven at a disk surface position at a height of approximately H _1/2 from the lower surface 5f of the cartridge 5. A pair of upper and lower shutter holes 8e having a long hole shape facing the pair of upper and lower head insertion holes 7 formed in the upper and lower shells 3 and 4 are formed in a pair of upper and lower horizontal plate portions 8a and 8b of the shutter 8. I have. Further, the upper and lower shells 3 of the cartridge 5,
The upper and lower surfaces 5e, 5f of 4 are formed with a label attaching recess 17 having a shape bypassing the rear end surface 5d.

Then, as shown in FIG. 72, this small-capacity floppy disk cartridge FDC is recorded and / or
Alternatively, a small-capacity floppy disk drive FDD, which is a lower-order disk drive for reproduction, has a disk table 23 and a carriage 26 and a head arm 2 which are rotationally driven by a spindle 22 of a spindle motor 21.
Gimbal plate (not shown) on the upper and lower opposing surfaces at the tip of 7
A pair of upper and lower magnetic heads 28, 2 attached via
9 and the like are stored. A magnetic sheet 24 for chucking, a rotation drive pin 25 for a small-capacity floppy disk FD, and the like are mounted on the disk table 23. It is rotatably mounted via arrows 30 in the directions of arrows e and f, which are the up and down directions. The head arm 27 is rotationally urged downward by a head pressure bonding spring (not shown) in the direction of arrow f. When the carriage 26 is horizontally driven in the directions of arrows a and b by the linear actuator, the head arm 27 is horizontally driven in the same direction integrally with the carriage 26, and a pair of upper and lower magnetic heads 28,
29 are configured to be horizontally moved integrally in the same direction.

At this time, the lower magnetic head 29 is arranged at a height reference position with respect to a mechanical base (not shown).
The upper magnetic head 28 is moved by an upper magnetic head elevating mechanism (not shown) as shown by a dashed line.
72, between the unloading position raised by a predetermined height and the loading position for pressing the floppy disk 1 onto the lower magnetic head 29 as shown by a solid line in FIG. It is configured.

As shown in FIG. 72, before the loading of the small-capacity floppy disk cartridge FDC into the small-capacity floppy disk drive FDD, the upper magnetic head 28 is moved to the unloading position indicated by the one-dot chain line. Up in the direction of arrow e. Therefore, a small-capacity floppy disk cartridge FDC is inserted into a cartridge loading mechanism (not shown).
As shown by the dotted line, the height is higher with respect to the lower magnetic head 29,
After horizontally inserting the small-capacity floppy disk cartridge FDC into the unloading position lowered with respect to the upper magnetic head 28 in the direction of arrow a, the cartridge FDC is lowered vertically by parallel movement to the loading position shown by the solid line by the cartridge loading mechanism. I do. Then, the small-capacity floppy disk cartridge FDC lowered to the loading position is horizontally mounted and positioned on a total of four cartridge positioning pins (not shown) installed in the small-capacity floppy disk drive FDD. You. Therefore, the small-capacity floppy disk cartridge FDC is loaded without any interference by the pair of upper and lower magnetic heads 28 and 29.

The small-capacity floppy disk
During the horizontal insertion operation in the direction of arrow a into the loading position of the cartridge FDC, the small-capacity floppy disk
The shutter 8 of the small-capacity floppy disk cartridge FDC is moved from the closed position shown in FIGS. 69 and 70 to the open position shown in FIG. 71 by a shutter opening / closing mechanism (not shown) installed in the drive FDD. 8d, the shutter 8 is slid in the direction of the arrow d so that a pair of upper and lower shutter holes 8e of the shutter 8 are superimposed on a pair of upper and lower head insertion holes 7 of the cartridge 5,
While the pair of upper and lower head insertion holes 7 is opened,
The pair of upper and lower shutter holes 8e and head insertion holes 7
Are inserted into the upper and lower inner sides of the pair of upper and lower magnetic heads 28 and 29.

As shown by the solid line in FIG. 72, when the small capacity floppy disk cartridge FDC is lowered vertically from the unloading position to the loading position in the direction of arrow f, the center core 2 of the small capacity floppy disk FD is The spindle 22 is chucked on the magnet sheet 24 of the disk table 23, the spindle 22 is relatively fitted into the center hole 2 a of the center core 2 from below, and the rotation drive pin 25 on the disk table 23 is rotated.
Are fitted into the rotation drive pin fitting hole 2b formed at the eccentric position of the center core 2 relatively from below. Then, the small-capacity floppy disk cartridge FDC is moved from the unloading position to the loading position by an arrow f.
When the head arm 27 is vertically lowered in the direction, the head arm 27 is rotated in the arrow f direction from the unloading position to the loading position by the head pressure spring, and the upper magnetic head 28 is lowered in the arrow f direction from the unloading position to the loading position. And a pair of upper and lower magnetic heads 28,
29 is a pair of upper and lower shutter holes 8e and head insertion holes 7
The pair of upper and lower magnetic heads 28 and 29 are pressed against the upper and lower surfaces of the floppy disk 1 in the cartridge 5.

As described above, a small capacity floppy disk
When the loading operation of the small-capacity floppy disk cartridge FDC into the drive FDD is completed, the disk table 23 is rotationally driven by the spindle motor 21 and the center core 2 is rotationally driven by the rotational drive pin 25 thereof, whereby the floppy disk 1 is rotationally driven in the cartridge 5 at a low speed of, for example, 200 to 250 rpm. However, at this time, the upper and lower surfaces of the floppy disk 1 are rotated while the upper and lower surfaces of the floppy disk 1 are kept in contact with the pair of upper and lower cleaning sheets 15 in the cartridge 5, and the upper and lower surfaces of the floppy disk 1 are automatically cleaned by the pair of upper and lower cleaning sheets 15. You. The carriage 26 and the head arm 27 are horizontally driven in the directions of the arrows a and b integrally by a linear actuator (not shown), so that a pair of upper and lower magnetic heads 2 are formed.
8 and 29 scan (seek and track) the floppy disk 1 in the directions of arrows a and b, and data is recorded and / or reproduced on the floppy disk 1.

The small-capacity floppy disk cartridge F after recording and reproduction of the floppy disk 1
The unloading operation of the DC to the outside of the small-capacity floppy disk drive FDD is performed in the reverse of the above-described loading operation, and the small-capacity floppy disk cartridge FDC is moved from the loading position shown by a solid line in FIG. When the center core 2 is lifted vertically from the disk table 23 by the parallel movement to the unloading position indicated by the dotted chain line in the direction of arrow h, the head arm 27 is moved upward.
72 is rotated in the direction of arrow e from the loading position shown by the solid line in FIG. 72 to the unloading position, against the head pressure spring, and the upper magnetic head 28 is raised in the direction of arrow e from the loading position to the unloading position. The pair of magnetic heads 28 and 29 are relatively detached vertically outside the cartridge 5. When the small-capacity floppy disk cartridge FDC is pushed out of the small-capacity floppy disk drive FDD horizontally in the direction of arrow b at the unloading position, the shutter 8 is turned off as shown in FIG.
The shutter plate 8 is slid in the direction of arrow c from the open position shown in FIG. 1 to the closed position shown in FIG. 69 and FIG.
The pair of upper and lower head insertion holes 7 of the cartridge 5 is closed by 8b.

(2) Large-capacity floppy disk
Description of Cartridge Next, as shown in FIGS. 64 to 66, the large-capacity floppy disk cartridge HFDC recorded and / or reproduced by the large-capacity floppy disk drive HFDD to be described later is the same as the small-capacity floppy disk drive described above.
Similarly to the cartridge FDC, a large-capacity floppy disk HFD having a structure in which a floppy disk 1 made of a magnetic sheet having a diameter of 3.5 inches is bonded to an outer periphery of a center core 2 which is a disk made of a stainless steel plate is formed of synthetic resin. It is rotatably housed in a cartridge 5 constituted by upper and lower shells 3 and 4. Then, the recording capacity of the large-capacity floppy disk HFD is set to 10
In order to increase the size to 0 MB or more, preferably 300 to 700 MB, the magnetic films on both the upper and lower surfaces of the large capacity floppy disk HFD are thinned to the order of submicron,
In addition, the rotation speed of the large-capacity floppy disk HFD can be increased to a high-speed rotation range of 3600 rpm or more.

On the other hand, this large-capacity floppy disk cartridge HFDC has a recording capacity of 1 to 2 M in a large-capacity floppy disk drive HFDD described later.
B, small capacity floppy disk cartridge FD
C, the external dimensions and thickness of the cartridge 5 of the large-capacity floppy disk cartridge HFDC are substantially the same as the external dimensions and thickness of the cartridge 5 of the small-capacity floppy disk cartridge FDC. I have. Then, in a large-capacity floppy disk drive HFDD, which will be described later, the large-capacity floppy disk cartridge HFDC can be identified with the small-capacity floppy disk cartridge FDC so that the large-capacity floppy disk cartridge HFDC can be identified.
In the cartridge HFDC, the arrangement of the write protector 13 and the capacity discriminating hole 14 is reversed, and the newly provided large capacity discriminating hole 18 is formed at a position near one of the reference holes 9 formed in a perfect circular hole. ing. In this large-capacity floppy disk cartridge HFDC, the shutter 8 has a substantially T-shaped planar shape to increase the effective area inside the cartridge 5 and to prevent the small-capacity floppy disk cartridge FDC from being erroneously inserted. A groove 20 for preventing erroneous insertion corresponding to the slope 12 of the front end face 5a of the upper end 5e of the cartridge 5
1a. The rotation drive pin fitting hole 2b formed in the center core 2 of the floppy disk 1 in the large capacity floppy disk cartridge HFDC is the center core 2 of the floppy disk 1 in the small capacity floppy disk cartridge FDC.
The hole is formed in a size sufficiently larger than the rotation drive pin fitting hole 2b formed in the hole a.

(3): Large-capacity floppy disk
Overview of Drive Next, as shown in FIGS. 1 to 8, a large-capacity floppy disk drive HFDD of the present invention, which is an example of a disk drive device and constitutes an upper disk drive
The upper and lower covers 42 and 43 made of a thin sheet metal or the like are detachably attached to the upper and lower sides of a chassis 41 made of a light metal such as a sheet metal or an aluminum die cast, and molded on the front side thereof with a synthetic resin or the like. The detached front panel 44 is detachably attached to constitute a flat rectangular parallelepiped drive main body 45. The external dimensions and thickness of the drive main body 45 are the same as those of the small-capacity floppy disk drive FDD. I have. And
A horizontally long cartridge insertion port 46 is formed on the upper end side of the front panel 44, and an inward opening / closing lid 47 is attached inside the cartridge insertion port 46. An eject button 48 and a light-emitting display unit 49 for displaying an operation state of the drive are attached to left and right sides of a lower portion of the front panel 44.

Then, inside the drive main body 45,
A spindle motor 51 and a disk table 53 mounted on the spindle motor 51 are disposed above the chassis 41 on the front panel 44 side. The disk table 53 is provided with a disk table 53 formed on the upper surface of a rotor fixed to the upper end of the spindle 52. On the upper surface of the disk table 53, a chucking magnetic sheet 54 or a small capacity A rotation drive pin 25 and the like of the floppy disk FD are attached. A cartridge holder 56 made of sheet metal or the like is provided above the chassis 41 on the front panel 44 side. A cartridge loading mechanism 58 having a slide plate 57 formed of a sheet metal or the like for performing the operation is incorporated. The chassis 41 on the rear end side opposite to the front panel 44 side
A linear actuator 103 for transferring a pair of upper and lower magnetic heads 101 and 102, which is configured as a flying head as described later, is incorporated in the upper part of the head. The spindle motor 51 and a pair of upper and lower magnetic heads 1
R / W gap of 01, 102 is floppy disk 1
It is disposed on the scanning center P ₂ which is a recording and / or scanning position for playing (seek and tracking positions) data to. A plurality of circuit boards such as a motor board 59, a main board 60, and a switch board 61 are screwed horizontally below the chassis 41, and an external interface 62 is mounted on the rear end of the chassis 41. The substrate 63 is screwed horizontally. On the upper part of the chassis 41, a pair of left and right positioning reference pins 64 and a height reference pin 65 are vertically attached to the lower positions of the four corners of the cartridge holder 56, and the reference pin 64 is a height reference pin. Is also used. Then, the switch board 61
A cartridge insertion detection switch 66, a detection switch 67 for preventing erroneous erasure, a small-capacity detection switch 68, and a large-capacity detection switch 69, each of which is a push switch mounted on the top of the Exposed at the bottom. An eject switch 70 that is turned on by the eject button 48 is mounted on the lower surface of the front end of the switch board 61 (the end on the front panel 44 side).

As shown in FIGS. 52 to 56, the chassis 41 has a horizontal bottom plate portion 41a and left and right side plate portions 41b vertically raised from both left and right sides thereof. The motor 51 is screwed to the lower portion of the bottom plate portion 41a of the chassis 41 by a motor board 59 via a total of three spacers 71. The disk table 53 mounted on the upper part of the spindle motor 51 projects from the opening 72 formed in the bottom plate portion 41a above the bottom plate portion 41a. The cartridge holder 56 includes a horizontal top plate portion 56a and left and right side plate portions 56 vertically lowered from both left and right sides thereof.
b, and a pair of left and right bottom plate portions 56c that are horizontally turned inward from the lower ends of the left and right side plate portions 56b to form a generally flat, substantially U-shaped, large-capacity floppy disk cartridge HFDC and A small-capacity floppy disk cartridge FDC includes a top plate portion 56a of the cartridge holder 56 and left and right side plate portions 56b.
The cartridge is inserted horizontally into and out of the cartridge insertion space 56d surrounded by the left and right bottom plate portions 56c from the directions of arrows a and b. The front panel 4 of the top plate 56a of the cartridge holder 56
A head insertion opening 73 is cut out at the center of the rear end side opposite to the side 4. The slide plate 57 also has a horizontal bottom plate portion 57a, like the chassis 41, and left and right side plate portions 57b vertically raised from both left and right sides of the bottom plate portion 57a. And this slide plate 5
7 is slidably engaged with a total of four reference pins 64 and a height reference pin 65 by a total of four guide grooves 74 formed in the bottom plate portion 57b, and the slide plate 57 is attached to the bottom plate portion 41a of the chassis 41. arrow a between the unloading position P ₁₁ and the loading position P ₁₂ in the above,
It is configured to be slidable in the b direction.

Then, the cartridge loading mechanism 5
8, as shown in FIGS. 2, 3, 4, 7, and 8,
A total of four guide pins 75 formed on the front and rear ends of the left and right side plate portions 56b of the cartridge holder 56 by drawing or the like, and a total of four guide pins 75 formed on the left and right side plate portions 57b of the slide plate 57 are slid. A total of four inclined guide grooves 76 freely engaged with each other, a pair of left and right guide projections 77 integrally formed at substantially the center in the front-rear direction of the left and right side plates 56b of the cartridge holder 56, and the left and right side plate portions of the chassis 41 A pair of right and left vertical guide grooves 78 formed in the pair 41b and slidably engaged with a pair of left and right guide projections 77 in the directions of arrows g and h, which are the up and down directions.
And is constituted by. The slide plate 57 is slid in the forward direction of the arrow b by a tension coil spring 79 which is a slide urging means attached between the slide plate 57 and the chassis 41. On the opposite side), the bottom plate portion 41a
An eject motor 80 is attached to one upper side. An ejection cam 82 having an ejection drive pin 81 formed at an eccentric position is attached to the ejection motor 80. The ejection motor 82 extends rearward from the rear end of one of the side plates 57b of the slide plate 57. The ejecting drive pin 81 drives the arm 83 for driving. At the front position (position on the front panel 44 side) of the eject motor 80 on the bottom plate portion 41 a of the chassis 41, a cartridge insertion detection lever 84 also serving as a shutter opening / closing lever is provided with a fulcrum pin 8.
5 is rotatably mounted in the directions indicated by arrows i and j between a lock position indicated by a solid line in FIG. 4 and an unlock position indicated by a dashed line in FIG. 4, and is locked by rotation urging means (not shown). It is urged to rotate to the position in the direction of arrow i. The cartridge insertion detecting lever 84 locks and unlocks a locked portion 86 formed on the slide plate 57.

[0024] Then, according to the cartridge loading mechanism 58, as shown in FIGS. 4 and 7, is slid in the direction of the arrow a against the coil spring 79 pulling the slide plate 57 to the rear of the unloading position P ₁₁ In this state, the lock is locked by the cartridge insertion detection lever 84 engaged with the locked portion 86, and the total four guide pins 75 of the cartridge holder 56 are raised by the total four inclined guide grooves 78 of the slide plate 57. The cartridge holder 56 is pushed up in the direction of the arrow h to guide the pair of left and right guide projections 77 by the pair of right and left vertical guide grooves 78, and moves the cartridge holder 56 to the unloading position P ₁₃ at the same height as the cartridge insertion port 46 shown in FIG. Upward drive by parallel motion. When the cartridge insertion detection lever 84 is rotated in the direction of arrow j from the lock position shown by the solid line in FIG. 4 to the lock release position shown by the one-dot chain line, the lock of the slide plate 57 by the cartridge insertion detection lever 84 is released. Te, the slide plate 57 is slid in the arrow b direction by the tension coil springs 79 from the unloading position P ₁₁ shown in FIG. 7 to the front of the loading position P _12, the slide plate 57
The total of four guide pins 75 of the cartridge holder 56 are pushed down by the four inclined guide grooves 78 in the direction of arrow g, which is the lower side, and a pair of left and right guide projections 77
While guiding the pair of left and right vertical guide grooves 78, by parallel motion in the direction of arrow g cartridge holder 56 in FIG. 8 (A) that is set below the unloading position P ₁₃ to the loading position P ₁₄ shown by the solid line Drive down. At this time, as shown in FIG. 4, the slide plate 57 is driven at a low speed by a damping action of a damper 88 mounted on the bottom plate portion 41a of the chassis 41 and engaged with a rack 87 formed on the slide plate 57. With arrow b
And the cartridge holder 56 is configured to be gently driven down from the unloading position to the loading position. Then, when the ejection cam 82 is driven by one turn from the position shown in FIG. 8A by the ejection motor 80, the ejection drive pin 81 slides as shown in FIGS. 8B and 8C. hook the eject arm portion 83 of the plate 57, is slidably driven in the arrow a direction from the unloading position P ₁₂ against the slide plate 57 to the tension coil springs 79 to the rear of the loading position P _11, the cartridge holder 56 is from the loading position P ₁₄ shown in FIG. 8 (a) by parallel movement to the unloading position P ₁₃ shown in FIG. 7 are driven upward in the direction of arrow h, automatic return to the direction of arrow i to the lock position 84 shown by the solid line in FIG. 4 The slide plate 5 is moved by the
7 is configured to be automatically locked again in its unloading position P _13. As shown in FIG.
On one side of the rear end side of the top plate portion 56a of the cartridge holder 56, a cartridge erroneous insertion prevention lever 89 is attached rotatably in the directions of arrows k and m around the fulcrum pin 90, and this cartridge erroneous insertion prevention The lever 89 is rotationally urged in the direction of arrow k by a tension coil spring 91 which is a rotational urging means attached between the lever 89 and the top plate 56a. Also, the top plate 56 of the cartridge holder 56
A pair of left and right cartridge press-fit springs 92 made of a leaf spring or the like are attached to both left and right positions of the line a. The large-capacity floppy disk drive HFDD configured as described above is configured to be attached to an internal chassis of a computer device or the like by a lower cover 43, and the entire chassis 41 is provided under the insulators 93 by a total of four insulators 93. The large-capacity floppy disk drive HFDD is elastically supported on the upper portion of the cover 43 to realize vibration resistance against external vibrations and the like.

The large-capacity floppy disk drive HFDD is configured as described above, and the large-capacity floppy disk cartridge HFDC and the small-capacity floppy disk cartridge FDC are selectively inserted from the cartridge insertion port 46 for loading. The data is selectively recorded and / or reproduced on the large-capacity floppy disk HFD and the small-capacity FD.

That is, as shown by a dashed line in FIGS. 3, 4 and 7, the large-capacity floppy disk cartridge H
FDC or small capacity floppy disk cartridge F
When DC horizontally inserted in the direction of arrow a in the cartridge holder 56 being raised to the unloading position P ₁₃ from the cartridge insertion opening 46, the locking cartridge insertion detection lever 84 from the locked position at the front end surface 5a of the cartridge 5 The shutter 8 is rotated in the direction of arrow j to the release position. During this time, the shutters 8 are opened in the direction of arrow d by the cartridge insertion detection lever 84 against the shutter spring 8d. At the moment when the cartridge insertion detecting lever 84 is rotated in the direction of the arrow j to the unlock position, the cartridge holder 56 allows these large-capacity floppy disk cartridges HFD.
C or small capacity floppy disk cartridge FDC
There is driven downward in the direction of arrow g from the unloading position P ₁₃ to the loading position P ₁₄ shown in FIG. 8, the high capacity floppy disk cartridge HFDC or small capacity floppy disk cartridge FDC is horizontally in its loading position P ₁₄ To be loaded.

When the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC is correctly inserted from the cartridge insertion port 46, the cartridge wrong insertion prevention lever 89 is relatively inserted into these wrong insertion prevention grooves 20. Or by rotating in the direction of arrow m by the slope 12 to escape, the large-capacity floppy disk cartridge H
FDC and small capacity floppy disk cartridge FD
C can be inserted. On the other hand, when the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC is erroneously inserted from the cartridge insertion port 46 (that is, inserted in an upside-down or front-to-back reversed direction), the cartridge is erroneously inserted. The insertion prevention lever 89 can inhibit the insertion of the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC.

[0028] Then, the high capacity floppy disk cartridge H loaded on the loading position P ₁₄
FDC or small capacity floppy disk cartridge F
The DC is horizontally pressed and positioned on a total of four reference pins 64 and a height reference pin 65 by a pair of left and right cartridge pressing springs 93, and a loading completion state of these is detected by a cartridge insertion detection switch 66. Whether the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC is protected from erroneous erasure, and the recording capacity of the floppy disk 1 is determined by the erroneous erasure detection switch 67, the large-capacity detection switch 69, or the small-capacity detection switch 68. Is detected. Then, the center of the floppy disk 1 is inserted into the center core hole 6 of the cartridge 5 from below.
3 is chucked by the magnet sheet 24, and the center hole 2a of the center core 2 is
And these rotary drive pin fitting holes 2b
Is fitted to the rotation drive pin 25. These floppy disks 1 are each driven to rotate at a predetermined rotational speed by a spindle motor 51, and a pair of upper and lower magnetic heads 1 are driven by a linear actuator 103.
01,102 arrow a along the scanning center P _2, while the transfer direction b, the these data to a floppy disk 1 selectively recorded and / or to play.

At this time, with respect to the floppy disk 1 of the small-capacity floppy disk cartridge FDC, a pair of upper and lower members is positioned by a positioning function based on an engagement relationship between the rotation driving pin 25 and the rotation driving pin fitting hole 2b of the center core 2. Of the floppy disk 1 with respect to the magnetic heads 101 and 102 of the floppy disk 1, and the floppy disk 1 is
By rotating and driving at a low speed of 50 rpm, data recording and / or reproduction is performed with the pair of upper and lower magnetic heads 101 and 102 in contact with the upper and lower surfaces of the floppy disk 1. On the other hand, with respect to the floppy disk 1 of the large-capacity floppy disk cartridge HFDC, the rotation driving pin fitting hole 2b of the center core 2 is formed in a large hole, and the rotation driving pin 25 is formed in the rotation driving pin fitting hole 2b. It is loosely fitted inside. Therefore, with respect to the floppy disk 1 of the large-capacity floppy disk cartridge HFDC, the position on the circumference is not determined by the rotation drive pin 25 like the small-capacity floppy disk cartridge FDC, and the tracking is performed by the tracking servo method described later. While performing, the floppy disk 1 is 360
By rotating and driving at a high speed of 0 rpm or more, the pair of upper and lower magnetic heads 101 and 102 is moved as shown in FIGS.
As shown in FIG. 5, 100 MB in a non-contact state in which the air film generated on the upper and lower surfaces of the floppy disk 1 flies (flying phenomenon) on a submicron order.
Data recording and / or reproduction is performed with the above large capacity (high density).

When the eject button 48 is pressed after data is recorded and / or reproduced on the floppy disk 1 in this manner, the eject switch 70 is turned on, and the eject motor 82 rotates the eject cam 82 by one turn. being driven, in the direction of arrow h high capacity floppy disk cartridge HFDC or small capacity floppy disk cartridge FDC is by the cartridge holder 56 to the unloading position P ₁₂ shown in FIG. 7 from the loading position P ₁₄ shown in FIG. 8 (a) A large capacity floppy disk cartridge HFDC or a small capacity floppy disk cartridge is driven by a cartridge insertion detecting lever 84 which is driven upward and rotated in the direction of arrow i from an unlocked position shown by a one-dot chain line to a locked position shown by a solid line in FIG. car With ridges FDC is pushed in the direction of the arrow b as shown by the one-dot chain line from the cartridge insertion port 46 in FIG. 7, the shutter 8 is closed in the direction of the arrow c by the shutter spring 8d.

[0031] (4) Description of ... linear actuator Next, as shown in FIGS. 9 20, along a pair of upper and lower magnetic heads 101, 102 are configured to flying head scanning center P ₂ arrows Transfer in the a and b directions. The linear actuator 103 includes a voice coil motor 109 including a pair of left and right coils 104 and a magnetic circuit 108 in which a closed magnetic path is formed by a pair of left and right magnet plates 105 and yokes 106 and 107.
At this time, the pair of upper and lower magnetic heads 101 and 102 are supported by a carriage 111 formed of a synthetic resin or the like via a pair of upper and lower head arms 112 and 113 as described later. The carriage 111 is mounted on the chassis 4
Guide main shaft 114 mounted in parallel form the scanning center P ₂ on one of the bottom plate portion 41a and the guide sub-shaft 1
Is guided by 15 while arrow a along the scanning center P _2, it is slidably configured in the b direction. A pair of left and right coils 104 are horizontally mounted on an upper part of a coil receiving base 116 integrally formed on both left and right sides of the carriage 111 and adhered by an adhesive 117. On the other hand, a pair of left and right magnetic circuits 108 are horizontal, and a pair of upper and lower yokes 1 are horizontally arranged at an interval vertically.
A rectangular closed magnetic path is formed by abutting upper and lower ends of 06 and 107 in the longitudinal direction from above and below, and the magnet plate 105 is tightly joined to the lower surface of the upper yoke 106 (or the upper surface of the lower yoke) by its own magnetic force. It is a thing. The pair of left and right magnetic circuits 108 are connected to the bottom plate 41 of the chassis 41.
attached to the scanning center P ₂ parallel to the horizontal state on a, the outer circumference of the lower yoke 107 of the scanning center P pair of coils 104 is a pair of left and right that are arranged at a right angle shape for the _two magnetic circuits 108 ( Or, it is inserted into the outer periphery of the upper yoke 106) in a non-contact state. The pair of left and right coils 104 is electrically connected to the main board 60 via the flexible printed circuit board 118 shown in FIG. Circuit 10
8, a propulsive force is generated in the pair of left and right coils 104 to move the carriage 111 to the guide main shaft 114 and the guide sub shaft 115.
(Seek and tracking) in the directions of arrows a and b along the arrow.

(5) Description of Guide Spindle Attaching Apparatus Next, as shown in FIGS. 9 to 15, the guide spindle attaching apparatus 121 for attaching the guide spindle 114 to the chassis 41 first includes a guide. A small-diameter tapered shaft portion 122 is formed on the front end 114a, which is one end of the main shaft 114, in the same axial center state, and a chamfered portion 1 is formed on the outer periphery of the rear end 114b, which is the other end.
23 are formed. Then, this guide at the front end fixed position of the main shaft 114 are formed cut-and-raised pieces 124 located right angles with respect to the scanning center P ₂ are cut and raised vertically like upwards from the bottom plate portion 41a of the chassis 41 The guide main bearing hole 125 into which the tapered shaft portion 122 of the guide main shaft 114 is inserted into the cut and raised piece 124.
Are formed. In addition, this guide main bearing hole 125
Is formed at a diameter intermediate between the minimum diameter and the maximum diameter of the tapered shaft portion 122. Then, the guide spindle 114 is vertically raised upward from the rear end of the bottom plate portion 41a of the chassis 41 to the scanning center at the rear end fixed position of the guide spindle 114 to the scanning center.
Rear plate portion 41 which is a side wall arranged at right angles to ₂
The rear main plate portion 41c has a guide main bearing groove 12 cut vertically downward from its upper end.
6, and a V-shaped tapered surface 127 is formed at the lower end of the guide main bearing groove 127. Then, the rear surface of the rear side plate portion 141c (the front panel 44)
A leaf spring 128 is detachably attached to the left and right sides by a pair of left and right positioning dowels 130 and one or a plurality of screws 131.
28, the center P ₁₁₄ of the guide spindle ₁₁₄
The pressing piece 129 which is inclined at an angle θ ₁ with respect to is formed integrally.

Then, the guide spindle 114 is connected to the chassis 41.
When attached to the parallel horizontal condition and scanning center P ₂ on the top, as shown in FIG. 15, the guide main shaft 114
Of the guide spindle 114 is inserted into the guide spindle receiving hole 125 from the direction of arrow n.
After the 4b is inserted into the guide main bearing groove 126 from the direction of arrow o, the leaf spring 128 is fitted from the back side to the pair of left and right dowels 130 of the rear plate portion 41c of the chassis 41 by the pair of left and right dowel holes 132 for positioning. The pair of left and right screws 131 inserted from the rear into the pair of left and right screw insertion holes 133 of the leaf spring 128 is attached to one or more screw stopper holes 155 formed in the rear plate portion 41c. Then, the leaf spring 128 is screwed to the back surface of the rear plate portion 41c from the direction of arrow n. Then, the pressing piece 129 of the leaf spring 128 is moved to the rear end 114 of the guide spindle 114.
a is pressed against the chamfered portion 123 a against elasticity from the direction of the arrow p which is a direction inclined with respect to the axis P ₁₁₄ , and the pressing piece 129 presses the chamfered portion 123 of the guide main shaft 114 in the direction of the arrow p. F _p is added. The guide main shaft 114 by the horizontal component force F _n of the pressing force F _p
Is pressed in the direction of the arrow n which is the axial direction, and the tapered shaft portion 122 of the guide main shaft 114 is inserted into the guide main bearing hole 12.
While being pressed by wedge action to 5, the guide main shaft 114 by the vertical component force F _o of the pressing force F _p is pressed in the arrow o direction is a direction perpendicular to the axial direction, the guide main shaft 114 The rear end 114b is pressed into the tapered surface 127 of the guide main bearing groove 126 by wedge action, and the guide main shaft 114 is fixed on the chassis 41. Then, the tapered shaft portion 122 and the tapered surface 12
Scanning center P by self-aligning action
The parallelism of the guide spindle 114 with respect to ₂ is set with high accuracy.

According to the guide spindle mounting device 121 configured as described above, one leaf spring 128 which is a single component having the pressing piece 129 is attached to the rear plate portion 41 of the chassis 41.
The guide spindle 114 can be mounted on the chassis 41 with high precision and extremely easily by the small number of parts and the small number of assembling steps that are only required to be screwed with one or a plurality of screws 131 on the back surface of the rear surface c. Cost reduction and productivity can be significantly improved.

(6) Description of the Guide Subshaft and Yoke Attaching Device Next, as shown in FIGS.
And a pair of upper and lower yokes 106 and 107 of the magnetic circuit 108
A pair of left and right mounting device 141 for mounting a parallel form with scanning center P ₂ on the chassis 41,
A yoke mount 142 made of a non-magnetic member such as a synthetic resin is used. A pair of recessed front and rear yoke fitting portions 143 are formed at the upper ends of both ends of the yoke mounting base 142 in the front and rear length direction, and are provided on the rear side (or front side) of one yoke fitting portion 143. The yoke contact piece 144 is integrally formed. A pair of front and rear screw insertion holes 145 penetrating the yoke mounting table 142 in the up-down direction is formed at the center of both ends in the front-rear length direction of the yoke mounting table 142. A pair of front and rear positioning dowels 146 are formed on the lower surfaces at both ends in the front and rear length direction. Then, screw insertion holes 148 are provided at four corners of the yoke holding plate 147 which is horizontally placed across the upper part of the pair of left and right magnetic circuits 108.
The yoke press plate 147 is formed at the center in the left-right direction with a positioning recess 149 for a pair of left and right upper yokes 106. A screw insertion groove 15 is provided at both front and rear ends of the pair of upper and lower yokes 106 and 107.
0 is formed. Here, the upper yoke 10
The front and rear ends 107a of the lower yoke 107 are attached to the butting portion 106a which is bent vertically downward from the lower surfaces of the front and rear ends of the lower yoke 107.
And a pair of upper and lower yokes 106 and 107 are tightly connected to each other by the magnetic force of the magnet plate 105 to form a closed magnetic path. Both yokes 106, 10
Similar butting portions may be formed on the lower surface and the upper surface of both front and rear ends of 7. Then, as shown in FIGS. 17A and 17B, one of the pair of left and right yoke mounting bases 142 is located at the rear end of the front and rear ends of the lower part of the pair of front and rear yoke fitting portions 143. Is formed with a through hole 151 through which the guide counter shaft 115 is inserted horizontally, and a blind hole 152 is formed at the front end side. These through hole 151 and blind hole 152 are formed.
It is formed in parallel horizontal state scanning center P ₂ is.

The guide counter shaft 115 and the yoke 10
6. Scanning center P on chassis 41
_When mounting in a horizontal state parallel to ₂ ,
And (A) and (B) of FIG.
15 is inserted horizontally through the through-hole 151 of one yoke mount 142 from the rear end 115a in the direction of arrow n from the rear side, and the front end 115a is fitted into the blind hole 152. However, in this fitted state, the rear end 115b of the guide sub shaft 115 protrudes rearward from the through hole 151 by the protruding amount X.

Next, as shown in FIGS. 17 and 18, a pair of left and right yoke mounts 143 are fitted into a pair of left and right dowel holes 153 formed in the bottom plate portion 41a of the chassis 41 by a pair of dowels 146 in front and rear. inserting the yoke mount 142 of the left and right pair is engaged when positioned scanning center P ₂ and parallel horizontally on the bottom plate portion 41a, the rear end 115b of the guide sub-shaft 115 is inside of the side plate portion 41c after the chassis 41 Is done. Then, the front and rear ends of the pair of left and right yokes 106 and 107 are fitted into the pair of front and rear yoke fitting portions 144 of the pair of left and right yoke mounts 142 from above to be horizontally installed. At this time, the rear ends (or front ends) of the pair of left and right yokes 106 and 107 are
4 so that the pair of left and right yokes 10
6, 107 can be easily and accurately positioned in the yoke fitting portion 143.

Next, as shown in FIGS. 17 and 18, the yoke pressing plate 14 is placed between the upper portions of the pair of left and right upper yokes 106.
7 is placed horizontally, and at this time, the yoke holding plate 147
The pair of left and right upper yokes 106
The yoke holding plate 1
47 can be easily positioned with respect to the upper yoke 106. Thereafter, a total of four screws 154 having a long shaft length are vertically inserted into the four screw insertion holes 148 of the yoke holding plate 149 from above, and these screws 1
54 is the screw insertion groove 1 of the pair of left and right yokes 106 and 107
Through 50, a total of four screw insertion holes 145 of a pair of left and right yoke mounts 142 are inserted from above. Then, the lower ends of these four screws 154 are attached to a total of four screw fixing holes 155 formed in the bottom plate portion 41a of the chassis 41, and the four screws 154 make the yoke press plate 149 and the left and right pair. Yokes 106, 10
7 and the yoke mounting table 142 are fastened together with the bottom plate portion 41a.
When screws are fastened to the upper guide sub-shaft 115 and a pair of right and left yokes 106 and 107 are mounted parallel to form a scanning center P ₂ on the chassis 41.

Since these yoke mounts 142 are screwed onto the bottom plate 41a of the chassis 41, the rear end 115a of the guide sub shaft 115 is
The rear plate 41c of the chassis 41 serves as a stopper for preventing the guide sub shaft 115 from falling off, and the guide sub shaft 115 is located rearward from the yoke mount 142 in the direction of arrow q. Will not fall off.

According to the guide sub-shaft and yoke mounting device 141 configured as described above, the yokes 106, 10
Yoke mount 1 for mounting 7 on chassis 41
The mounting base 42 can also serve as a mounting base for the guide sub shaft 115, and the rear plate 41c of the chassis 41 can also serve as a stopper for preventing the guide sub shaft 115 from falling off, thereby reducing the number of parts and the number of assembly steps. Therefore, cost reduction and productivity can be significantly improved.

In FIG. 17A, the guide counter shaft 1 is shown.
Although the front end 115a of the 15 is configured to be fitted into the blind hole 152, as shown in FIG. 17B, a through hole 156 having a diameter smaller than the diameter of the guide sub shaft 115 is provided at the front end of the yoke mount 142. At the same time, a small-diameter shaft 157 is formed at the front end of the guide counter shaft 115 so as to be coaxial with the small-diameter shaft 1.
57 into the small-diameter through-hole 156, and the small-diameter shaft 1
Even if the guide sub shaft 115 is brought into contact with the butting surface 159 of the yoke mounting base 142 from the direction of the arrow n by the step portion 158 on the outer periphery of 57, the same effect as the above-described blind hole 152 can be obtained.

FIG. 21 shows a prior art in which the guide main shaft 114 and the guide sub shaft 115 are mounted on the chassis 41.
The positioning reference 161 for the guide main shaft 114 and the guide sub shaft 115 is formed on the chassis 41, and the guide main shaft 114 and the guide sub shaft 115 are respectively held by a total of four holding plates 163 screwed on the chassis 41 by four screws 162. Are fixed to the chassis 41 by pressing both front and rear ends thereof against the positioning reference 161. According to this conventional technique, a large number of positioning references 161, screws 1
62 and the holding plate 163 were required, the number of parts and the number of assembling steps were increased, the cost was high, and productivity was poor.

On the other hand, according to the guide sub-shaft and yoke mounting device 141, although the guide sub-shaft 115 can be mounted on the chassis 41 together with the pair of upper and lower yokes, the number of parts and the assembly Man-hours can be reduced to a minimum.

(7) Description of bearing device for guide main shaft and guide sub shaft Next, as shown in FIGS. 9, 19 and 20, in the bearing device 171 for the guide main shaft 114 and guide sub shaft 115, First, the guide main shaft 114 and the guide sub shaft 115 are formed as cylindrical shafts made of stainless steel or the like.
4 is configured as a large-diameter shaft, and the guide sub shaft 115 is configured as a small-diameter shaft. As described above, the pair of upper and lower magnetic heads 101 and 102 is
A pair of front and rear thrust bearings 172 formed of a cylindrical bearing such as an oilless metal are integrally buried at both front and rear ends of a substantially central portion in the left and right direction of the carriage 111 attached via a through-sert molding or the like. The carriage 111 is slidably inserted around the outer periphery of the guide main shaft 114 by a pair of front and rear thrust bearings 172. The center P ₁₁₄ of guide main shaft 114 is disposed in the scanning center P ₂ on or only slightly (a few millimeters) the scanning center P ₂ parallel form at a position offset with respect to the scanning center P _2. And the thrust bearing 1 of the guide counter shaft 115
73 is integrally formed at a position closer to the outside of the lower part of one of the pair of left and right coil receivers 116 formed integrally with the carriage 111. The thrust bearing 1
73 has a U-shaped groove 173b inside a substantially U-shaped projection 173a opened laterally outward of the coil receiving base 116, and is slidably inserted into the outer periphery of the guide sub shaft 115 by the U-shaped groove 173b. It is. And the guide spindle 1
The horizontality of the carriage 111 is set by two guide shafts 14 and a guide sub shaft 115, and the guide main shaft 1
14 perpendicularity of the carriage 111 relative to the scanning center P ₂ is set by the guide sub-shaft 115 performs the function of rotation stopper for stopping the rotation of the carriage 111 around the guide main shaft 114.

The bearing device 17 configured as described above
According to No. 1, by disposing the thrust bearing 172 of the guide main shaft 114 substantially in the center of the carriage 111, and disposing the thrust bearing 173 of the guide sub shaft 115 near the outer end of the lower portion of the coil receiving base 116, , A center P ₁₁₄ between the guide main shaft 114 and the guide sub shaft 115,
It is possible to set a large span L ₁ between the P _115, it can significantly reduce the influence of rattling of the carriage 111 by the clearance of the thrust bearing 172, 173 with respect to the guide main shaft 114 and guide sub-shaft 115, the carriage 111 The pair of upper and lower magnetic heads 101 and 102 are moved along the guide main shaft 114 by arrows a,
The data can be stably transported in the direction b, and high-density recording and / or reproduction of data on the floppy disk 1 can be stably performed with high accuracy. In particular, the guide spindle 1
By arranging the fourteen centers P ₁₁₄ on or near the scanning center P ₂ , the R / W gaps of the pair of upper and lower magnetic heads 101 and 102 can be moved to the scanning center P ₂ along the directions of arrows a and b. It can be moved with high precision.

However, the guide spindle 114 can be arranged within the projected area of the carriage 111, and
Since the guide sub shaft 115 can be arranged within the projected area of the one coil 104, the guide sub shaft 115 and its thrust bearing 173 do not protrude laterally outward of the one coil receiving base 116, and the ejection is performed. and can significantly reduce the clearance L ₂ between the other components and one coil cradle 116 of the motor 80 or the like, the chassis 41
By increasing the space factor in the disk drive, it is possible to reduce the size and weight of the large-capacity floppy disk drive HFDD. Further, the thrust bearing 1 of the guide counter shaft 115
Reference numeral 73 may be a structure in which another component is attached to the coil receiving base 116. However, when the thrust bearing 173 is integrally formed with the coil receiving base 116, cost reduction and improvement in productivity can be achieved by reducing the number of parts and the number of assembly steps. Can be planned. Although the thrust bearing 173 of the guide countershaft 115 can be disposed above the coil 104, if the thrust bearing 173 is disposed below the coil receiving base 116, the thrust bearing 173 can be disposed on the coil receiving base 116.
It is easy to integrally mold with a synthetic resin or the like, and the productivity is improved.

FIGS. 22 and 23 show the guide spindle 11.
4 is a diagram shown to consider a problem related to a span between the guide shaft 4 and a guide counter shaft 115 and a clearance between one coil receiving base 116 and another component such as the eject motor 80. That is, FIG. 22 shows that the thrust bearings 172 and 173 of the guide main shaft 114 and the guide sub shaft 115 are arranged close to the center of the carriage 111. In this case, one of the coil receiving base 116 and the ejection motor 80 although capable of a large clearance L ₂ between the other components etc., the guide main shaft 114 and the guide span L ₄ becomes too remarkably small between the auxiliary shaft 115, the guide main shaft 114 and the guide sub-shaft Since the rattle of the carriage 111 due to the clearance of the thrust bearings 172 and 173 with respect to 115 increases, the high-density recording and / or reproduction of data on the floppy disk 1 cannot be performed. FIG. 23 shows a case where a thrust bearing 174 made of a component different from the carriage 111 is attached to the outside of one of the coil receiving bases 116 with screws or the like. whereas the span L ₅ can be sufficiently large between the countershaft 115, would extend off thrust bearing 174 is only large protruding amount L ₆ outside the one coil cradle 116, the thrust bearing 174 easily interferes with other parts such as the eject motor 80, and the chassis 4
1, the space factor becomes worse, which leads to the increase in the size and weight of the large-capacity floppy disk drive HFDD. In addition, the structure in which the thrust bearing 174 formed of a component different from the carriage 111 is attached to the coil receiving base 116 with a screw or the like increases the number of components and the number of assembly steps, resulting in an increase in cost and poor productivity. Become.

(8) Description of Head Assembly Next, as shown in FIGS. 24 to 26, the carriage 111 of the head assembly 110 is formed of a rigid member made of a synthetic resin, or a light metal such as aluminum or magnesium. A pair of upper and lower magnetic heads 101 and 102 constituted by flying heads are attached to the front end of a carriage 111 via a pair of upper and lower head arms 112 and 113. And a pair of upper and lower head arms 1
Reference numerals 12 and 113 each include an arm base 181 formed of a rigid member made of a synthetic resin, a light metal such as aluminum or magnesium, which is a molded component, and a suspension 182 formed of an elastic member such as a leaf spring. That is, the suspension 182 is integrally connected to the tip of the arm base 181 by a screw fixing method using a screw 183 or an integral molding by outsert molding. A pair of upper and lower head bases 184 are adhered to the upper and lower opposing surfaces of the tip of the suspension 182 of the upper and lower head arms 112 and 113, and a pair of chip-shaped upper and lower opposing surfaces are attached to the upper and lower opposing surfaces of the upper and lower head bases 184. Magnetic heads 101 and 102 are bonded via a gimbal plate (not shown). The length L ₁₁ is the head arm 112, 113 of the arm base 181 in the pair of upper and lower head arms 112, 113
It is set to a length more than one-third of the total length L ₁₂ of the. 7 and 8, the large-capacity floppy disk cartridge HFDC and the small-capacity floppy disk cartridge FDC are connected to the large-capacity floppy disk drive HFDD in the directions of arrows u and g and directions h and b. Since there is almost no need to move the lower magnetic head 102 up and down during loading and unloading, the arm base 181 of the lower head arm 113 supporting the lower magnetic head 102 is attached to the carriage 111. It can be integrally molded or fixed with screws or the like. However, when a large-capacity floppy disk cartridge HFDC or a small-capacity floppy disk cartridge FDC is loaded and unloaded into the large-capacity floppy disk drive HFDD in the directions of arrows a, g and h, b, 101 is a cartridge HFDC or F
Since the arm base 181 of the head arm 112 supporting the upper magnetic head 101 needs to be moved up and down so as not to interfere with the DC, a rotation support mechanism is provided on an upper magnetic head mounting base 185 formed integrally with the carriage 111. 186, it is rotatably mounted in the directions of arrows e and f, which are the vertical directions.

[0049] Then, as shown in FIGS. 27 to 31, the rotation supporting mechanism 186, the left and right sides of the rear end of the arm base 181 of the upper head arm 112, perpendicular rotational axis relative to the scanning center P ₂ integrally molded pivot pin 185 comprising a pair of left and right cylinder axis on the P _21, the pair of left and right V a fulcrum pin fitting groove integrally molded these support pins 185 on the left and right sides of the upper magnetic head mount 185
It is fitted into the groove 188 from above. Then, the coil portion 191a of the torsion coil spring 191 which is a rotation urging means is horizontally inserted into a horizontally formed spring support arm 190 of a spring receiver 189 made of sheet metal, synthetic resin, or the like. Receiver 189 and torsion coil spring 1
91 is inserted into an opening 192 formed in the arm base 181, and the spring receiver 189 is screwed from above from above the upper magnetic head mount 185 with a screw 193, and the torsion coil spring 191 is connected to a pair of left and right fulcrum pins. 18
It is attached in a state where it is close to between seven. The arm base 181 is integrally formed with a spring abutment rib 194 disposed so as to cross under the torsion coil spring 191 at substantially the center of the opening 192, and the movable end 191 b of the torsion coil spring 191 is subjected to spring force. The torsion coil spring 191 is pressed against the spring contact rib 194 from above, and the fixed end 191c of the torsion coil spring 191 is held in the spring receiver 189.
Is crimped from below.

According to the rotation supporting mechanism 186 configured as described above, the entire arm base 181 is moved and urged in the downward direction of the arrow r by the torsion coil spring 191, so that the pair of left and right fulcrum pins 187 is moved. A pair of left and right V
The groove 188 is pressed from the direction of the arrow r. Then, a rotational urging force is applied to the arm base 181 in the direction indicated by the arrow f below the center of the pair of left and right fulcrum pins 187, and the arm base 181 is moved to the front end of the upper magnetic head mounting base 185 (the magnetic head 101 side). The left and right horizontal reference surfaces 195 integrally formed at the upper end of the are pressed from the direction of arrow f and stabilized.

[0051] Thus, the upper and lower pair of left and right support pins 187 being in contact at all times good stability to the two contact points P ₂₂ of the pair of left and right V-grooves 188, the upper head arm 112 about the pair of left and right support pins 187 Even if the arm base 181 is returned in the arrow f direction by the torsion coil spring 191 and abuts on the pair of left and right horizontal reference surfaces 195, the arm base 181 can rotate in the directions indicated by arrows e and f. 187 inconveniences float rise from the two contact points P ₂₂ above the pair of left and right V-groove 188 is not at all occur. That is, no rattling or the like occurs at the support portions of the pair of left and right fulcrum pins 187, and the arm base 181 is connected to the fulcrum pins 187.
Can be rotated with high accuracy in the directions of arrows e and f. Moreover, the carriage 111 and the upper head arm 11
Since no unstable element against twisting or twisting such as a leaf spring is interposed between the torsion coil spring 19 and
Unless an excessive external force exceeding the spring force of 1 is applied in the upward direction of the arrow v, the degree of freedom against twisting and twisting is not generated in principle. Therefore, the upper magnetic head 101
Of the upper head arm 112 with respect to the carriage 111 can be minimized.
Of the suspension 182 can be secured. As a safety measure for preventing the pair of left and right fulcrum pins 187 from being detached upward from the pair of left and right V-grooves 188 due to excessive external force, a pair of left and right fulcrum pins 1
A pair of left and right fulcrum pin holding plates 2 for holding 87 from above
06 is an upper magnetic head mounting base 185 by a screw 207.
It is screwed on the left and right sides.

In addition, the rotation support mechanism 186 has a spring 197 formed of a leaf spring or the like as a shifting means in a spring fitting groove 196 formed on one side of the front end side of the upper magnetic head mounting base 185. Of the arm base 181 is slid in the direction of the arrow w which is one side at the rear end of the biasing spring 197, and the end face of one fulcrum pin 187 (or one V A pivot 198 integrally formed with the side surface of the groove 188 is elastically pressed against the side surface of one V-groove 188 (or the end surface of one fulcrum pin 187). Therefore, the arrow e of the upper head arm 112,
The floppy disk 1 of the upper magnetic head 101 supported by the front end of the suspension 182 of the upper head arm 112 despite the fact that the rotation in the f direction can be performed smoothly.
In the circumferential direction can be secured. That is, the positional accuracy of the upper magnetic head 101 with respect to the floppy disk 1 can be repeatedly ensured. Moreover, the arm bases 18 made of rigid members are provided on the head arms 112 and 113.
By using No. 1, the length of the suspension 182 can be shortened, so that the vibration resonance point of the suspension 182 which adversely affects the tracking servo can be raised to a higher position.
Can be prevented as much as possible. In addition, long suspension 1
In the head arm of the type in which the head 82 is directly mounted on the carriage 111, when the spring constant of the suspension 182 becomes loose and the attitude of the drive HFDD is changed, the magnetic heads 101, 1 are affected by the weight of the suspension 182.
02 is different from the height of the floppy disk 1 with respect to the floppy disk 1 or is weak against external vibration.
Such a problem can be greatly improved by shortening No. 2.

A pair of left and right slide arms 199 are integrally formed on the left and right sides of the front end (upper magnetic head 101 side) of the arm base 181 of the upper head arm 112, as shown in FIGS. A pair of right and left slide arms 199 are provided at the center of the rear end side of the top plate portion 56a of the cartridge holder 56 at the scanning center P.
_The head insertion opening 73 cut out along ₂ is slidably mounted in the directions of arrows a and b above the right and left side edges of the opening 73.

Therefore, this large-capacity floppy disk
According to the drive HFDD, a large capacity floppy disk cartridge HFDC or a small capacity floppy disk
The unloading state of the cartridge FDC, when the cartridge holder 56 is raised in the arrow h direction to the unloading position P ₁₃ shown in FIG. 7, by the cartridge holder 56 a pair of left and right slide arms 199 of the upper head arm 112 arrow As shown in FIGS. 29 and 32, the arm base 181 of the upper head arm 112 is rotated up in the direction of arrow e against the torsion coil spring 191 as shown in FIGS. The suspension 182 and the upper magnetic head 101 are retracted in the direction indicated by the arrow f to a high position where they do not interfere with the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC which is moved in and out in the directions of the arrows a and b. Also,
From the beginning, the lower magnetic head 102 is set at a low position where it does not interfere with the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC.

Next, the high capacity floppy disk cartridge HFDC and low-capacity floppy disk cartridge FDC is loaded completion state, is lowered in the direction of the arrow g cartridge holder 56 to the loading position P ₁₄ shown in FIG. 8, first, 26 and 33, the lower magnetic head 102 is inserted into the lower head insertion hole 7 of the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC from below, and these floppy disks are inserted. The lower surface of the disk 1 is contacted. At this time, the cartridge holder 56 is lowered in the direction of arrow g to a position lower than the lowest position of the pair of left and right slide arms 199 of the upper head arm, and as shown in FIGS. 28, 30 and 33, Arm base 1 of head arm 112
81 is rotated downward in the direction of arrow f by the torsion coil spring 191 around the pair of left and right fulcrum pins 187 and is brought into contact with the pair of left and right horizontal reference surfaces 195 to be stabilized. Then, the suspension 182 of the upper head arm 112 causes the upper magnetic head 101 to be inserted from above into the upper head insertion hole 7 of the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC. It is configured to be in contact with the upper surface.

When the pair of upper and lower magnetic heads 101 and 102 come into contact with the upper and lower surfaces of the floppy disk 1, the height, parallelism and flatness of the pair of upper and lower suspensions 182 with respect to the floppy disk 1 are accurately determined. Most importantly, the height, parallelism, and flatness of the pair of upper and lower suspensions 182 with respect to the floppy disk 1 can be managed with high accuracy according to the rotation support mechanism 186 described above. . Moreover,
Since no unstable element such as twisting or twisting occurs in the pair of upper and lower suspensions 181, the floppy disk 1 of the large capacity floppy disk cartridge HFDC is driven to rotate at a high speed of 3600 rpm or more. As shown in FIG. 61 and FIG. 63, the upper and lower surfaces of the floppy disk 1 are floated by air films to record and / or reproduce a large amount of data of 100 MB or more at a high density. By balancing the load of the suspension 181, the pair of upper and lower magnetic heads 101 and 102 can be floated at a stable height with respect to both the upper and lower surfaces of the floppy disk 1. Not at all. In addition, since the pair of upper and lower magnetic heads 101 and 102 can smoothly follow the slight runout of the floppy disk 1, high-density recording and / or reproduction of data can always be performed stably. it can. The lower head arm 113 is also moved vertically (arrows e,
It is also possible to attach it rotatably in the (f direction).

By the way, as shown in FIG. 34, in the upper head arm 112, when the suspension 182 has a free angle θ ₁₁ with respect to the arm base 181, the cartridge holder 56 raised in the direction of arrow h to the unloading position. When the upper head arm 112 is rotated and raised in the direction of the arrow e, the arm base 181 is raised to a sufficient height in the direction of the arrow e due to a variation in the bending angle of the load bending portion 201 of the suspension 182 or the like. The lifting amount of the magnetic head 101 is insufficient, and there is a danger that the upper magnetic head 101 may interfere with the large-capacity floppy disk cartridge HFDC or the small-capacity floppy disk cartridge FDC that is taken in and out in the directions of arrows a and b. is there.

In order to avoid this danger, FIG.
As shown in FIG. 5, a hook attached to an arbitrary position between the load bending portion 201 and the upper magnetic head 101 above the suspension 182 with the tip of the lifting arm 202 integrally extending forward from the front end of the arm base 181. If the lifting mechanism 204 that hooks on the member 204 and lifts the suspension 182 in the direction of arrow e is attached, when the arm base 181 is lifted in the direction of arrow e, the suspension 181 is free as shown by a dashed line in FIG. and can lift always reliably to the safety position indicated by a solid line, which is higher than the lowermost position of the corner theta _11, arrows a, large-capacity floppy disk cartridge HFDC and low-capacity floppy disk cartridge FDC is out from the direction b Risk of the upper magnetic head 101 being destroyed by interference It can be avoided.

The lifting mechanism 105 is similar to that shown in FIG.
As shown in FIG. 38, a lifting arm 206 made of a leaf spring or the like is mounted on an arm base 181 by screwing together a screw 183, and the tip of the lifting arm 206 is placed above the suspension 182 with the load bending portion 201 and the upper magnetic field. The suspension 182 is hooked on a pin 207 laid horizontally at an arbitrary position between the head and the head 101.
Can be changed in various ways, such as lifting up in the direction of arrow e.

(9) Description of Soft Loading Mechanism Next, as shown by a dashed line in FIG. 3, a soft loading mechanism having a plunger solenoid 211 between a pair of upper and lower head arms 112 on the chassis 41. 212 is mounted. The soft loading mechanism 212 includes a fixing plate 213 fixed on the chassis 41 and a chassis 4.
1, a total of four V-shaped links 215 and 216 are symmetrically mounted on a slide plate 214 slidably mounted in the directions of arrows c and d on the pair of left and right common fulcrum pins 2.
17 and 218, and are rotatably mounted via these V
The left and right ends of a pair of upper and lower elevating members 219 and 220 horizontally disposed between the upper and lower ends of the shaped links 215 and 216 are connected to the tips of a total of four V-shaped links 215 and 216 via a total of four coupling pins 221 and 222. The slide plate 214 is slidably biased in the direction of arrow c by a tension coil spring 223 which is a slide biasing means mounted between the fixed plate 213 and the slide plate 214 so as to be rotatable relative to each other. The slide plate 214 can be slid in the direction of arrow d by the jar 211a. Then, a cam 224 is formed on both upper and lower surfaces of a pair of upper and lower elevating members 219 and 220, and a pair of upper and lower head arms 1 and 220 are formed.
A cam follower 225 such as a slide pin is attached to the upper and lower opposing surfaces of 12 and 113.

Then, the soft loading mechanism 21
According to FIG. 2, when the recording and / or reproduction of the floppy disk 1 is completed, as shown in FIG. 39 and FIG.
4 Slide drive in the direction of arrow c, reducing the distance L ₂₁ in the pair of right and left common pivot pin 217, a total of four V-shaped link 215 and 216 are a pair of upper and lower lifting members 219, 220 by opening the upper and lower It opens in the arrow y direction, which is the vertical direction. Then, after this, a pair of upper and lower magnetic heads 1
41A is retracted in the direction of the arrow a to the outermost position of the floppy disk 1 by the linear actuator 103, as shown in FIG. The pair of upper and lower head arms 112 and 11 slides on the cam 224 of the elevating members 219 and 220 in the direction of arrow a.
3 is opened up and down.

Next, recording on the floppy disk 1 and / or
Alternatively, at the time of reproduction, as shown in FIG. 41 (C), when the pair of upper and lower magnetic heads 101 and 102 are moved from the outermost position of the floppy disk 1 to the data recording area by the linear actuator 103 in the direction of the arrow b, FIG. (B), a pair of upper and lower head arms 112,
113 is a pair of upper and lower elevating members 21
9, 220 gently slide down on the cam 224 in the direction of arrow b, and finally a pair of upper and lower magnetic heads 101, 102.
Is performed so that the user can gently contact the upper and lower surfaces of the floppy disk 1.

The pair of upper and lower magnetic heads 112, 1
When the sensor (not shown) detects that the disk 13 has entered the data recording area of the floppy disk 1, as shown in FIG.
1 is excited, and the slide plate 214 is slid in the direction of arrow d by the plunger 211a against the tension coil spring 223. Then, the distance L ₂₂ in the left and right of the common pivot pin 217 is enlarged, a total of four V
When the shape links 215 and 216 are closed up and down, the pair of up and down members 219 and 220 are closed in the direction of the arrow z, which is the up and down direction, and the pair of up and down members 219 and 2
20 is no longer interfered by the cam followers 215 of the pair of upper and lower head arms 112, 113, and the floppy disk 1
The recording and / or reproduction of the data can be performed smoothly.

Such a soft loading mechanism 212
-Capacity floppy disk drive HFDD equipped with
Is configured as a flying head, so that a pair of upper and lower magnetic heads 101 and 102 having low impact resistance can always safely and quietly contact the upper and lower surfaces of the floppy disk 1. Accordingly, a pair of upper and lower magnetic heads 101, 10
2 can be prevented from being inadvertently brought into contact with the upper and lower surfaces of the floppy disk 1 to damage the pair of upper and lower magnetic heads 101 and 102 and the floppy disk 1, thereby ensuring high safety and durability. Can be secured.

(10) Description of Tracking Scale Next, as shown in FIGS. 42 to 44, a linear actuator 103 is provided with a tracking scale 231. The tracking scale 231 is a scale for performing compatibility with the small-capacity (lower-order) floppy disk 1 in the small-capacity floppy disk cartridge FDC to thereby make the small-capacity floppy disk 1 compatible. A thin plate-like track gauge 234 having a slit group 232 having the same pitch as the track pitch of the small-capacity floppy disk 1 and an opening 233 for detecting the outermost peripheral position of the small-capacity floppy disk 1. The light sensor 237 includes a light emitting unit 235 that is a light emitting element for detecting the positions of the slit 232 and the opening, and a light receiving unit 236 that is a light receiving element. And
Track gauge 234 is positioned by the positioning dowels 237 on the carriage 111 is screwed to a vertical form with a screw 238, it is attached to the parallel state the track gauge 234 and scanning center P _2. On the other hand, an optical sensor 237 is attached to a lower portion of the yoke holding plate 147, and its light emitting portion 235 and light receiving portion 236 are provided.
Are disposed on both left and right sides of the track gauge 234.
Then, the linear actuator 203 along the upper and lower pair of magnetic heads for scanning center P ₂ when seeking along the radiation from the center of the small-capacity floppy disk 1, sequentially slit group 232 of the track gauge 234 by an optical sensor 237 The read data track position is detected, and the upper and lower pair of magnetic heads 101 and 102 perform tracking with respect to the specified data track position. The optical sensor detects the opening 233 so that the outermost position of the small-capacity floppy disk 1 can be detected.

The tracking scale 23
1, by parallel mounting with its center P ₁₁₄ in a position to close the track gauge 234 to the center P ₁₁₄ above or a center P ₁₁₄ of guide main shaft 114, and off-track due to rattling of the thrust bearing 172 of the guide main shaft 114 The tracking hysteresis can be greatly improved.

That is, in consideration of the space factor of the space inside the chassis 41, the arrangement of the optical sensors, and the like, as shown in FIG.
It is advantageous in design to attach the tracking scale 231 to the side surface of the carriage 111 opposite to the ejection motor 80. However, as shown in FIG. 46, the thrust bearing 172 of the guide spindle 114 has 2r ₂
-2r ₁ of clearance (However, 2r ₁ = guide spindle 1
14 and 2r ₂ = the diameter of the thrust bearing 172), and the clearance causes rattling of the carriage 111 with respect to the guide main shaft 114. Then, as shown in FIG. 47 by the backlash, the rotation of the theta ₃₁ is generated with respect to the guide main shaft 114 around a center point P ₃₁ of the span L ₃₁ of the pair of thrust bearings 172 on the carriage 111,
As shown in FIG. 48, the rotation angles at the radii r ₁ and r ₂ of the carriage 111 at that time are large rotation angles θr ₁ and θr ₂ proportional to the radii r ₁ and r ₂ . Based on this principle, as shown in FIG. 49, the tracking scale 231 is separated from the center P ₁₁₄ of the guide spindle 114 by a radius R, and
31 is compared with the guide spindle 31 disposed on the center P ₁₁₄ of the guide spindle 114, the rotation angle θ ₃₁
Are the same, these tracking scales 2
It can be seen that the displacement amounts X1 and X2 in the seek direction at point B of 31 increase in proportion to the radius R.

Therefore, the tracking scale 23
When the tracking scale 231 is provided on the lateral side surface of the carriage 111, the tracking scale 231 moves away from the center P ₁₁₄ of the guide spindle 114, and the off-track due to the displacement of the tracking scale 231 in the seek direction due to the rotation of the carriage 111 increases. As a result, the tracking performance deteriorates, and the tracking hysteresis increases.

In arranging the tracking scale 231 on or near the center P ₁₁₄ of the guide main shaft 114, the track gauge 234 may be disposed on either side directly above or below the guide main shaft 114. Either the track gauge 234 or the optical sensor 237 may be mounted on the carriage 111 and fixed to the chassis 41, but the track gauge 234 may be fixed on the chassis 41 and the optical sensor 235 mounted on the carriage 111. when, it is preferable to place the light receiving portion 236 on the center P ₁₁₄ of guide main shaft 114 or near.

(11) Description of Tracking Servo Next, as shown in FIGS. 50 and 51, in this large-capacity floppy disk drive HFDD, the large capacity (high-order) in the large-capacity floppy disk cartridge HFDC The tracking servo is executed for the floppy disk 1. That is, as shown in FIG. 50, the tracking servo employs an embedded servo system in which servo is performed in units of servo frames, and format information is written in a servo area. For example, the format information, a difference in format or version of the floppy disk 1 of the high capacity is information for informing the floppy disk drive HFDD of large capacity, which is recorded in the servo area S _A.

As shown in FIG. 51, the tracks TR _Ui , TR _Ui−1,.
TR _Uk ,... TR _Um−1 , TR _um and empty tracks TR _E0 , TR _{E2 ,.} empty formed on the inner circumferential position outside the user data recording area - track _{TR Em + 1, ···, TR} En-1,
TR _En are formed in the radial direction.

In the inner circumferential direction of the large-capacity floppy disk 1, a servo frame S divided into a plurality of h
_{F 1, SF 2, ···,} SF 8, ···, SF n are formed. For example, the number h of servo frames is about 100
It is. Therefore, during recording and / or reproduction of the large-capacity floppy disk 1, the servo frames SF ₁ , SF ₂ ,
.., SF ₈ ,..., SF _n can be read to perform highly accurate tracking.

(12) Description of Dust Shield Device Next, as shown in FIGS. 52 to 58, the large capacity floppy disk drive HFDD is provided with a dust shield device 241. This dust shield device 2
Reference numeral 41 denotes a large capacity floppy disk 1 of 3600
When recording and / or reproducing data with the pair of upper and lower magnetic heads 101 and 102 flying above the upper and lower surfaces of the floppy disk 1 by air films by rotating and driving at a high speed of not less than rpm. It is constituted by shield means for restricting the inflow of outside air into the inside. A cover 242 is attached to the shielding means along the outer periphery of the head insertion opening 200 on the upper surface of the cartridge holder 56 to shield the head insertion opening 200 from above.
The lower surface of the cartridge holder 56 is adhered along the outer periphery of the head insertion opening 200 to form the cartridge 5.
When the loading of the cartridge 5 is completed, the spacer 243 that shields around the upper head insertion hole 7 of the cartridge 5
When the loading of the cartridge 5 is completed, the spacer 244 that shields the periphery of the lower head insertion hole 9 of the cartridge 5 and the outer periphery of the center core hole 6 of the cartridge 5 are adhered to the bottom plate 41 a of the chassis 41. And a spacer 245 for shielding. The cover 242 can be made of synthetic resin, light metal, and other various materials in a wide range, and the spacers 243 to 245 can be made of an elastic member such as rubber or soft synthetic resin. Note that the cover 242 can also serve as an electromagnetic shield member of the magnetic head. However, a pair of upper and lower magnetic heads 101 and 102 are provided on the magnetic head insertion side of the cover 242 and the spacers 243 and 244.
241a for taking the cartridge 5 in and out of the cartridge 5,
242a and 243a are formed respectively. Also,
An annular spacer 246, which is a means for shielding the outer periphery of the spindle motor 51, is fastened together with the motor board 51 between the lower surface of the bottom plate portion 41 a of the chassis 41 and the motor board 59.

According to the dust shield device 241 configured as described above, the pair of upper and lower head insertion holes 7, the center core hole 6, and the spindle motor
Since the outer periphery of the cartridge 1 is shielded, the air flow A ₁ in the cartridge 5 is stabilized as shown in FIG.
Dust hardly flows into the cartridge 5 from the pair of upper and lower head insertion holes 7 and the center core hole 6 together with the outside air. Therefore, the dust that has flowed into the cartridge 5 is caught between the large-capacity floppy disk 1 and the magnetic heads 101 and 102, so that both the magnetic heads 101 and 102 and the floppy disk 1 may be damaged or output may be reduced. Such inconvenience can be prevented as much as possible. In particular, the magnetic powder of the magnetic layer applied to the surface of the floppy disk 1 for recording a large amount of data is 0.1 μm.
m, the coating thickness is about 0.2 μm, and the magnetic layer is easily damaged by dust, but the shield can prevent the magnetic layer from being damaged as much as possible.
And a stable output is obtained.

FIG. 60 shows the flow of air when the floppy disk 1 is rotated at a high speed with the head insertion port 7 and the like of the cartridge 5 kept open. by the air suction, the outside air a ₂ is sucked into easily from the head insertion opening 7 and the center core hole 6 in the cartridge 5, also, the internal air a ₃ of the cartridge 5 can be easily discharged to the outside from the head insertion opening 7 As a result, at the head insertion port 7 and the center core hole 6, the inflow and discharge of the outside air to the inside of the cartridge 5 are actively performed.

In implementing the shield device 241, it is preferable to employ the cartridge 5 shown in FIG. That is, a grained surface 247 is formed on the entire surface of the cartridge 5 formed of a synthetic resin for the purpose of preventing damage or the like. Since the textured surface 247 has fine irregularities,
The adhesion of the spacers 242, 243, 244, 245 is deteriorated.

Therefore, the spacers 243, 244, 24
5 is formed on the smooth surface 248 to improve the adhesion of the spacers 243, 244, and 245, thereby significantly improving the dust shielding effect. It is preferable that the smooth surface 248 is formed at least on the lower surface 5f of the cartridge 5.

(13) Description of Floppy Disk Cleaning Device Next, as shown in FIGS. 61 to 63, this large-capacity floppy disk drive HFDD records and / or records a large-capacity floppy disk 1. Alternatively, at the time of reproduction, dust D is sandwiched between the pair of upper and lower magnetic heads 101, 102 floating on the upper and lower surfaces of the large-capacity floppy disk 1 and the floppy disk 1, and these magnetic heads 101, 102 Cleaning device 251 for preventing both floppy disks 1 from being damaged
Is provided. And this cleaning device 25
For the first cleaning member 252, a non-woven fabric 252a charged with static electricity such as polypropylene is used. Note that the nonwoven fabric 252a alone does not have a spring property and may be permanently deformed.
It is desirable that a spring material 252b be attached to a.

A cleaning device 251 shown in FIG. 61A has a pair of upper and lower cleaning members 252 adhered to the side surface of the head base 184 on the upstream side in the rotation direction of the floppy disk 1, and these cleaning members 252 is brought into contact with or close to the upper and lower surfaces of the floppy disk 1 so that the dust D adhering to the upper and lower surfaces of the floppy disk 1 is electrostatically attracted and wiped on the magnetic heads 101 and 102 on the upstream side in the rotation direction of the floppy disk 1. By cleaning so as to remove the dust D by a method or the like, the dust D is prevented from being caught between the magnetic heads 101 and 102 and the floppy disk 1.

In FIG. 61B, a pair of upper and lower cleaning members 252 are adhered to the side surface of the head base 184 on the downstream side in the rotation direction of the floppy disk 1, and these cleaning members 252 are attached to the floppy disk 1.
By contacting or approaching the upper and lower surfaces of the magnetic heads 101 and 102, the dust D is cleaned on the downstream side in the rotation direction of the floppy disk 1 with respect to the magnetic heads 101 and 102 so as to remove the dust D by electrostatic attraction or wiping. This prevents dust D from circulating and being caught between the magnetic heads 101 and 102 and the floppy disk 1.

FIG. 62 shows a pair of upper and lower cleaning members 252 supported by the tip of a support arm 254 extending from a pair of upper and lower head arms 112 and 113. An effect equivalent to 252 can be obtained. As shown in FIG. 63, a pair of upper and lower cleaning members 252 are adhered to the inner peripheral edge 7a on the upstream or downstream side in the rotation direction of the floppy disk 1 at the head insertion opening 7 of the cartridge 5 to remove the dust D in the same manner as described above. Cleaning can also be performed so as to be removed by electrostatic suction, a wiping method, or the like.

According to the cleaning device 251 configured as described above, during recording and / or reproduction of the floppy disk 1, the upper and lower surfaces of the floppy disk 1 are used for the pair of upper and lower magnetic heads 101 and 102. On the upstream side or the downstream side in the rotation direction 1, a small area such as only the width of the magnetic heads 101 and 102 in the radiation direction from the center of the floppy disk 1 can be effectively cleaned. Therefore, even when the floppy disk 1 is driven to rotate at a high speed of 3600 rpm or more in the large-capacity floppy disk cartridge HFDC, the load torque of the floppy disk 1 can be extremely reduced, and the spindle motor 51 cannot rotate due to insufficient torque. The floppy disk 1 can always be stably rotated at a high speed of 3600 rpm or more by the small-capacity spindle motor 51 without causing any inconveniences such as the above, and high-density recording and / or reproduction of large-capacity data can be performed. Can always be performed stably.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the technical concept of the present invention. For example, the present invention is not limited to a floppy disk cartridge and a floppy disk drive, but can be applied to various disk drive devices for recording and / or reproducing various disk-shaped recording media.

[0084]

The disk drive device of the present invention having the above-described structure has the following advantages.

The first aspect of the present invention is the use of one yoke mount for the yoke of the voice coil motor and the guide sub shaft of the carriage.
Since parts can be attached to the chassis at the same time,
The guide sub shaft can be easily attached to the chassis together with the yoke, so that cost reduction and productivity improvement can be achieved by reducing the number of parts and the number of assembly steps.

A second aspect of the present invention is to insert a guide sub shaft from a through hole formed at one end of the yoke mount, and to form a blind hole or the like formed at the other end of the yoke mount with the end of the guide sub shaft in the insertion direction. When the yoke mount is detachably mounted on the chassis, the end opposite to the insertion direction of the guide sub shaft is arranged inside the side wall of the chassis, and the side wall of the guide sub shaft is The end on the insertion side is prevented from dropping out of the blind hole, etc., so the stopper for preventing the guide counter shaft from falling off can be used by the side wall of the chassis, further reducing the number of parts and the number of assembly steps. The cost can be reduced and the productivity can be further improved.

[Brief description of the drawings]

FIG. 1 shows a large capacity floppy disk to which the present invention is applied.
FIG. 2 is an external perspective view of the drive.

FIG. 2 is an exploded perspective view of the upper and lower covers and the front panel of the drive.

FIG. 3 is a partially cutaway plan view of the drive with an upper cover removed.

FIG. 4 is a plan view of the drive with a cartridge holder removed.

FIG. 5 is a bottom view of the drive.

FIG. 6 is a bottom view of the drive with a lower cover removed.

FIG. 7 is a side view showing an unloading state in the cartridge loading mechanism of the drive.

FIG. 8 is a side view showing a loading state in a cartridge loading mechanism of the drive.

FIG. 9 is a plan view illustrating a device for mounting the guide main shaft, guide sub shaft, and yoke of the drive.

FIG. 10 is a cross-sectional view taken along arrow 10-10 in FIG. 9;

FIG. 11 is a side view as viewed from the arrow 11-11 in FIG. 9;

FIG. 12 is a sectional view taken along line 12-12 of FIG. 11;

FIG. 13 is an exploded perspective view of the guide spindle mounting device.

FIG. 14 is a partially cutaway plan view in the assembled state of FIG. 13;

15 is a cross-sectional view taken along arrows 15A-15A and a cross-sectional view taken along arrows 15B-15B of FIG.

FIG. 16 is an exploded perspective view of a guide counter shaft and a yoke attaching device.

17 is a sectional view taken along arrows 17A-147A and a sectional view taken along arrows 17B-17B of FIG. 9;

18 is a sectional view taken along the line 18A-18A in FIG. 9 and FIG.
It is sectional drawing in 8B-18B arrow view.

FIG. 19 is a plan view of a bearing device for a guide main shaft and a guide counter shaft.

FIG. 20 is a cross-sectional view taken along the line 20-20 in FIG. 19;

FIG. 21 is a cross-sectional view illustrating a conventional bearing device.

FIG. 22 is a cross-sectional view illustrating a conventional bearing device.

FIG. 23 is a cross-sectional view illustrating a conventional bearing device.

FIG. 24 is a perspective view illustrating a head assembly.

FIG. 25 is a plan view of FIG. 24.

FIG. 26 is a side view of FIG. 25.

FIG. 27 is a partially cutaway plan view showing a rotation support mechanism of the head assembly.

FIG. 28 is a partially cutaway side view of FIG. 27;

FIG. 29 is a cross-sectional view when the upper head arm of FIG. 27 is rotated upward.

30 is a sectional view when the upper head arm of FIG. 27 is returned to a fixed position.

FIG. 31 is an exploded perspective view of FIG. 27.

FIG. 32 is a side view illustrating how a cartridge is inserted into and removed from the upper and lower magnetic heads.

FIG. 33 is a side view for explaining recording and reproduction of the cartridge inserted between the upper and lower magnetic heads.

FIG. 34 is a side view illustrating the free angle of the head arm.

FIG. 35 is a side view illustrating a head arm lifting mechanism.

FIG. 36 is a side view when the head arm of FIG. 35 returns to a home position.

FIG. 37 is a plan view illustrating another example of a head arm lifting mechanism.

FIG. 38 is a side view of FIG. 37.

FIG. 39 is a partially cutaway front view of the soft loading mechanism with the head arm open.

FIG. 40 is a partially cutaway front view of the soft loading mechanism in a head arm closed state.

FIG. 41 is a side view illustrating a soft loading operation of the soft loading mechanism.

FIG. 42 is a partially cutaway plan view illustrating a tracking scale.

FIG. 43 is a sectional view taken along arrows 43-43 in FIG. 42;

FIG. 44 is a sectional view taken along the line 44-44 in FIG. 42;

FIG. 45 is a diagram for examining the problems of the conventional tracking scale.

FIG. 46 is a diagram for examining the problems of the conventional tracking scale.

FIG. 48 is a diagram for examining the problems of the conventional tracking scale.

FIG. 49 is a diagram for explaining a tracking scale in this large-capacity floppy disk drive in comparison with a conventional example.

FIG. 50 is a diagram illustrating a tracking servo.

FIG. 51 is an explanatory diagram of a floppy disk explaining a tracking servo.

FIG. 52 is an exploded perspective view illustrating a cartridge holder part in the dust shield device.

FIG. 53 is an exploded perspective view illustrating a cartridge holder portion in the dust shield device.

FIG. 54 is a partially cutaway front view of the cartridge holder of FIGS. 52 and 53.

FIG. 55 is a perspective view of a spindle motor illustrating a dust shield device.

FIG. 56 is a cross-sectional view illustrating a dust shield device.

FIG. 57 is a cross-sectional view taken along arrow 57-57 of FIG. 56;

FIG. 58 is a bottom view of the cartridge that can enhance the dust shield effect.

FIG. 59 is a perspective view illustrating an air flow in the cartridge by the dust shield device.

FIG. 60 is a perspective view illustrating inflow and outflow of an airflow from a cartridge that is not dust-shielded.

FIG. 61 is a cross-sectional view illustrating a cleaning device for a floppy disk.

FIG. 62 is a side view illustrating another example of the cleaning device of the above.

FIG. 63 is a cross-sectional view illustrating another example of the above cleaning device.

FIG. 64 is a perspective view of a large-capacity floppy disk cartridge.

FIG. 65 is a plan view of FIG. 64.

FIG. 66 is a bottom view of FIG. 64.

FIG. 67 is a perspective view of a conventional small-capacity floppy disk cartridge.

FIG. 68 is an exploded perspective view of FIG. 67.

FIG. 69 is a plan view of FIG. 67;

70 is a bottom view of FIG. 67. FIG.

FIG. 71 is a sectional view of FIG. 67;

FIG. 72 is a sectional view illustrating a conventional small-capacity floppy disk drive.

[Explanation of symbols]

HFDD is a large-capacity floppy disk drive as a disk drive device, 1 is a floppy disk as a disk-shaped recording medium, 41 is a chassis, 41c is a side wall of the chassis, 101 and 102 are magnetic heads as heads, 104 is a coil, 105 is a magnet, 106, 1
07 is a yoke, 108 is a magnetic circuit, 109 is a voice coil motor, 111 is a carriage, 115 is a guide counter shaft,
141 is a mounting device, 142 is a yoke mounting base, 143 is a yoke fitting portion, 151 is a through hole, 152 is a blind hole, and 156.
Is a small diameter through hole, and 157 is a small diameter shaft.

[Procedure amendment]

[Submission date] July 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 shows a large capacity floppy disk to which the present invention is applied.
FIG. 2 is an external perspective view of the drive.

FIG. 2 is an exploded perspective view of the upper and lower covers and the front panel of the drive.

FIG. 3 is a partially cutaway plan view of the drive with an upper cover removed.

FIG. 4 is a plan view of the drive with a cartridge holder removed.

FIG. 5 is a bottom view of the drive.

FIG. 6 is a bottom view of the drive with a lower cover removed.

FIG. 7 is a side view showing an unloading state in the cartridge loading mechanism of the drive.

FIG. 8 is a side view showing a loading state in a cartridge loading mechanism of the drive.

FIG. 9 is a plan view illustrating a device for mounting the guide main shaft, guide sub shaft, and yoke of the drive.

FIG. 10 is a cross-sectional view taken along arrow 10-10 in FIG. 9;

FIG. 11 is a side view as viewed from the arrow 11-11 in FIG. 9;

FIG. 12 is a sectional view taken along line 12-12 of FIG. 11;

FIG. 13 is an exploded perspective view of the guide spindle mounting device.

FIG. 14 is a partially cutaway plan view in the assembled state of FIG. 13;

15 is a cross-sectional view taken along arrows 15A-15A and a cross-sectional view taken along arrows 15B-15B of FIG.

FIG. 16 is an exploded perspective view of a guide counter shaft and a yoke attaching device.

17 is a sectional view taken along arrows 17A-147A and a sectional view taken along arrows 17B-17B of FIG. 9;

18 is a sectional view taken along the line 18A-18A in FIG. 9 and FIG.
It is sectional drawing in 8B-18B arrow view.

FIG. 19 is a plan view of a bearing device for a guide main shaft and a guide counter shaft.

FIG. 20 is a cross-sectional view taken along the line 20-20 in FIG. 19;

FIG. 21 is a cross-sectional view illustrating a conventional bearing device.

FIG. 22 is a cross-sectional view illustrating a conventional bearing device.

FIG. 23 is a cross-sectional view illustrating a conventional bearing device.

FIG. 24 is a perspective view illustrating a head assembly.

FIG. 25 is a plan view of FIG. 24.

FIG. 26 is a side view of FIG. 25.

FIG. 27 is a partially cutaway plan view showing a rotation support mechanism of the head assembly.

FIG. 28 is a partially cutaway side view of FIG. 27;

FIG. 29 is a cross-sectional view when the upper head arm of FIG. 27 is rotated upward.

30 is a sectional view when the upper head arm of FIG. 27 is returned to a fixed position.

FIG. 31 is an exploded perspective view of FIG. 27.

FIG. 32 is a side view illustrating how a cartridge is inserted into and removed from the upper and lower magnetic heads.

FIG. 33 is a side view for explaining recording and reproduction of the cartridge inserted between the upper and lower magnetic heads.

FIG. 34 is a side view illustrating the free angle of the head arm.

FIG. 35 is a side view illustrating a head arm lifting mechanism.

FIG. 36 is a side view when the head arm of FIG. 35 returns to a home position.

FIG. 37 is a plan view illustrating another example of a head arm lifting mechanism.

FIG. 38 is a side view of FIG. 37.

FIG. 39 is a partially cutaway front view of the soft loading mechanism with the head arm open.

FIG. 40 is a partially cutaway front view of the soft loading mechanism in a head arm closed state.

FIG. 41 is a side view illustrating a soft loading operation of the soft loading mechanism.

FIG. 42 is a partially cutaway plan view illustrating a tracking scale.

FIG. 43 is a sectional view taken along arrows 43-43 in FIG. 42;

FIG. 44 is a sectional view taken along the line 44-44 in FIG. 42;

FIG. 45 is a diagram for examining the problems of the conventional tracking scale.

FIG. 46 is a diagram for examining the problems of the conventional tracking scale.

FIG. 47 Considers the problem of the conventional tracking scale.
It is a drawing to be considered.

FIG. 48 is a diagram for examining the problems of the conventional tracking scale.

FIG. 49 is a diagram for explaining a tracking scale in this large-capacity floppy disk drive in comparison with a conventional example.

FIG. 50 is a diagram illustrating a tracking servo.

FIG. 51 is an explanatory diagram of a floppy disk explaining a tracking servo.

FIG. 52 is an exploded perspective view illustrating a cartridge holder part in the dust shield device.

FIG. 53 is an exploded perspective view illustrating a cartridge holder portion in the dust shield device.

FIG. 54 is a partially cutaway front view of the cartridge holder of FIGS. 52 and 53.

FIG. 55 is a perspective view of a spindle motor illustrating a dust shield device.

FIG. 56 is a cross-sectional view illustrating a dust shield device.

FIG. 57 is a cross-sectional view taken along arrow 57-57 of FIG. 56;

FIG. 58 is a bottom view of the cartridge that can enhance the dust shield effect.

FIG. 59 is a perspective view illustrating an air flow in the cartridge by the dust shield device.

FIG. 60 is a perspective view illustrating inflow and outflow of an airflow from a cartridge that is not dust-shielded.

FIG. 61 is a cross-sectional view illustrating a cleaning device for a floppy disk.

FIG. 62 is a side view illustrating another example of the cleaning device of the above.

FIG. 63 is a cross-sectional view illustrating another example of the above cleaning device.

FIG. 64 is a perspective view of a large-capacity floppy disk cartridge.

FIG. 65 is a plan view of FIG. 64.

FIG. 66 is a bottom view of FIG. 64.

FIG. 67 is a perspective view of a conventional small-capacity floppy disk cartridge.

FIG. 68 is an exploded perspective view of FIG. 67.

FIG. 69 is a plan view of FIG. 67;

70 is a bottom view of FIG. 67. FIG.

FIG. 71 is a sectional view of FIG. 67;

FIG. 72 is a sectional view illustrating a conventional small-capacity floppy disk drive.

[Description of References] HFDD is a large-capacity floppy disk drive which is a disk drive device, 1 is a floppy disk which is a disk-shaped recording medium, 41 is a chassis, 41c is a side wall portion of the chassis, and 101 and 102 are magnetic heads , 104 are coils, 105 is a magnet, 106, 1
07 is a yoke, 108 is a magnetic circuit, 109 is a voice coil motor, 111 is a carriage, 115 is a guide counter shaft,
141 is a mounting device, 142 is a yoke mounting base, 143 is a yoke fitting portion, 151 is a through hole, 152 is a blind hole, and 156.
Is a small diameter through hole, and 157 is a small diameter shaft. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 9, 1999

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 9

FIG. 2

FIG. 3

FIG. 7

FIG. 62

FIG. 4

FIG. 5

FIG. 6

FIG. 41

FIG. 8

FIG. 10

FIG. 11

FIG.

FIG. 48

FIG. 13

FIG. 14

FIG.

FIG.

FIG. 16

FIG.

FIG. 21

FIG.

FIG.

FIG.

FIG. 23

FIG. 24

FIG. 25

FIG. 26

FIG. 27

FIG. 28

FIG. 29

FIG.

FIG. 50

FIG. 31

FIG. 32

FIG. 33

FIG. 47

FIG. 51

FIG. 34

FIG. 35

FIG. 36

FIG. 37

FIG. 61

FIG. 71

FIG. 38

FIG. 39

FIG. 40

FIG. 65

FIG. 70

FIG. 42

FIG. 43

FIG. 46

FIG. 52

FIG. 44

FIG. 45

FIG. 49

FIG. 58

FIG. 53

FIG. 54

FIG. 56

FIG. 59

FIG. 55

FIG. 57

FIG. 60

FIG. 63

FIG. 64

FIG. 66

FIG. 67

FIG. 68

FIG. 69

FIG. 72

Claims (2)

[Claims] 1. A carriage for transferring a head for recording and / or reproducing a disk-shaped recording medium, a coil attached to the carriage, a magnet and a yoke attached to a chassis, and the carriage is connected to a guide spindle and a guide shaft. A disk drive device provided with a voice coil motor for transferring along a guide sub shaft, wherein a yoke mounting base for mounting a yoke of the voice coil motor to a chassis also serves as a mounting base for the guide sub shaft. Drive device. 2. A through hole is formed at one end of the yoke mount, and a blind hole is formed at the other end of the yoke mount, or a small diameter through hole is formed at the other end of the yoke mount. A small-diameter shaft is formed at the end of the guide counter shaft in the insertion direction, and the end of the guide counter shaft in the insertion direction inserted from the through hole at one end of the yoke mount is inserted into the blind hole, or the small diameter shaft is inserted into the blind hole. When the small diameter shaft is inserted into the through hole, and the yoke mounting base is detachably attached to the chassis, the end opposite to the insertion direction of the guide sub shaft is arranged inside the side wall of the chassis. A disk drive device, wherein an end of the guide sub-shaft on the side wall of the chassis on the insertion direction side is prevented from falling out of the blind hole or the small-diameter through hole.