JPH11213599A - Large capacity floppy disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large capacity floppy disk cartridge for inhibiting erroneous insertion to an existing small capacity floppy disk drive. SOLUTION: The thickness H11 of this cartridge 45 for freely rotatably housing a large capacity floppy disk HFD inside is constituted to be H11 = about 5 mm, the thickness H12 of the lower shell 44 of the cartridge 45 is constituted to be H12 = about 1.5 mm and the thickness H13 of an upper shell 43 is constituted to be H13 = about 3.5 mm. Thus, the inconvenience of erroneously inserting this large capacity floppy disk cartridge into the small capacity floppy disk drive, damaging the thin type large capacity floppy disk of low rigidity and destroying the data of a narrow track width is prevented and high safety is secured.

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 novel large-capacity floppy disk cartridge capable of increasing the recording capacity to, for example, 100 MB (megabytes) or more.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS.
A small-capacity floppy disk cartridge FDC using a small-capacity floppy disk FD 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, The recording capacity of the small capacity floppy disk FD is configured to be a small capacity of 1 to 2 MB (megabyte). The small-capacity floppy disk cartridge FDC forms a flat, substantially square-shaped cartridge 5 by upper and lower shells 3 and 4 formed of synthetic resin, and the small-capacity floppy disk FD is rotatable in the cartridge 5. Stored in.

At this time, the center core 2 of the small-capacity floppy disk FD is loosely fitted in a center core hole 6 formed in the center of the lower shell 4, and the small-capacity floppy disk of the cartridge 5 indicated by an arrow a is described later. The horizontal walls 3a, 4a of the upper and lower shells 3, 4 are located between the front end face 5a, which is the end in the insertion direction into the drive, and the center core hole 6.
Long hole-shaped pair of upper and lower head insertion holes 7 along the cartridge center P ₁ is formed in the. 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-sliding recess 18 formed substantially in a U-shape on the outside of the front end portion 5a, and the shutter 8 is in the above-described insertion direction along the front end surface 5a. It is slidably mounted in directions of arrows c and d which are perpendicular to the direction of arrow a. The shutter 8 is slid in the direction of arrow c to the closed position by a built-in shutter spring 8d. In the lower shell 4 of the cartridge 5, a pair of left and right positioning reference holes 9 is formed at a position deviated toward the front end face 5a.
A pair of left and right semicircular recesses 10 are formed on the left and right side surfaces 5 b and 5 c of the cartridge 5 at positions near the front end surface 5 a of the lower shell 4. Then, a front end face 5a of the cartridge 5 and a right side face 5b which is one side face.
And the upper and lower shells 3 and 4 at 45 °
An inclined surface 12, which is a so-called C surface, 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.

Then, this small-capacity floppy disk
The outer dimensions of the cartridge 5 of the cartridge FDC are as follows: width W ₁ = about 90 mm, depth D ₁ = about 94 mm, thickness H ₁
= About 3 mm. And upper and lower shell 3,
Each of the upper and lower shells 3 and 4 has a thickness of about 1.5 mm, which is H _1/2.
a, 4a are configured to have a thickness T ₁ = about 0.3 mm.
The horizontal walls 3a, 4a of the upper and lower shells 3, 4
A small-capacity floppy disk FD is rotatably stored in a circular disk storage space 5e formed therebetween, and an inner wall surface 3b opposed to the horizontal walls 3a, 4a from above and below in the disk storage space 5e. , 4b is configured to have a clearance C _{1 of} about 2.2 mm.
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. lifter 16 for elastically contacting the upper and lower upper and lower recording surfaces FD ₁ of the small-capacity floppy disk FD is the inner wall surface 3a, 4a
Is attached to any one (or both) by bonding or the like. Accordingly, configured as the small-capacity floppy disk FD is driven to rotate the disk surface position P ₂ of approximately H _1/2 of the height from the bottom surface 5g of the cartridge 5 is sandwiched from above and below between the pair of upper and lower cleaning sheets 15 Have been. And, a pair of upper and lower horizontal plate portions 8a of the shutter 8,
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 8b. A rear end face 5d is provided on the upper and lower surfaces 5f, 5g of the upper and lower shells 3, 4 of the cartridge 5.
Is formed in a label-adhering recess 17 having a shape that bypasses.

As shown in FIG. 13, a spindle motor 2 is provided inside a small-capacity floppy disk drive FDD which is a lower-order disk drive for recording and reproducing the small-capacity floppy disk cartridge FDC.
A pair of upper and lower magnetic heads 28, 29 and the like attached via a gimbal plate (not shown) to the upper and lower opposing surfaces of the tip of a disk table 23, a carriage 26 and a head arm 27, which are driven to rotate by one spindle 22, are housed. Have been. 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, and a head arm 27 is mounted on a head arm mounting base 26a of the carriage 26 by a leaf spring. It is attached rotatably in the directions of arrows e and f, which are the up and down directions, via a hinge 30 using the like. The head arm 27 is rotationally urged downward by a head pressure bonding spring (not shown) in the direction of arrow f. Then, the carriage 26 is horizontally driven in the directions of arrows a and b by a head moving mechanism (not shown), whereby 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 is provided. , 29 are integrally and horizontally moved in the same direction.

At this time, the lower magnetic head 29 is arranged at a height reference position P ₃ with respect to a mechanical base (not shown), and the upper magnetic head 28 is moved by an upper magnetic head elevating mechanism (not shown) as shown in FIG. An up position P ₄ raised by a height H _{2 with} respect to the lower magnetic head 29 as shown by a dashed line, and a down position for pressing a small capacity floppy disk FD onto the lower magnetic head 29 as shown by a solid line in FIG. arrow between the position P ₅ e, which is vertically movable structure in the direction f.

As shown in FIG. 13, 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 up position P indicated by a dashed line. ₄ has been raised in the direction of arrow e. Therefore, the small-capacity floppy disk cartridge FDC is placed inside the cartridge loading mechanism (not shown) at a height H _{3 with} respect to the lower magnetic head 29 and with respect to the upper magnetic head 28 as shown by a dashed line. from the height H ₄ as low the direction of arrow a to the up position P ₅ after inserting horizontally Te, lowered vertically by parallel motion the small-capacity floppy disk cartridge FDC to the down position P ₆ indicated by the solid line by the cartridge loading mechanism I do. Then, a small capacity floppy disk cartridge FDC which are lowered into the down position P ₆ is horizontally mounted on a total of four cartridge positioning pins installed in the small-capacity floppy disk drive in the FDD (not shown) Positioned. 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 horizontal insertion movement of the arrow a direction to the up position P ₅ of the cartridge FDC, by a shutter opening and closing mechanism which is installed in the small-capacity floppy disk drive in the FDD (not shown), a small capacity floppy disk cartridge FDC The shutter 8 is slid in the direction of arrow d from the closed position shown in FIG. 11 to the open position shown in FIG. 9 against the shutter spring 8 d, and a pair of upper and lower shutter holes 8 e of the shutter 8 The pair of upper and lower head insertion holes 7 are overlaid on top of and below the pair of head insertion holes 7, and the pair of upper and lower head insertion holes 7 are opened. It is inserted inside the upper and lower sides of 29.

[0009] Then, as shown by the solid line in FIG. 13, when the small-capacity floppy disk cartridge FDC is moved down vertically in the direction of arrow g from the up position P ₅ to the down position P _6, the small-capacity floppy disk FD Center The core 2 is the magnet sheet 24 of the disc table 23
The spindle 22 is chucked upward, the spindle 22 is relatively fitted into the center hole 2a of the center core 2 from below, and the rotation drive pin 25 on the disk table 23 is formed at an eccentric position of the center core 2. It is relatively fitted into the rotation drive pin fitting hole 2b from below. When the small-capacity floppy disk cartridge FDC is moved down vertically in the direction of arrow g from the up position P ₅ to the down position P _6, the arrow f direction by the head compression spring head arm 27 to the down position from the up position is rotated, an arrow from the upper magnetic head 28 up position P ₄ is lowered in the direction of arrow f into the down position P _5, a pair of upper and lower magnetic heads 28 and 29 a pair of upper and lower shutter holes 8e and the head insertion holes 7 relatively inserted in the g and h directions,
The pair of upper and lower magnetic heads 28 and 29 are used for the upper and lower recording surfaces F of the small-capacity floppy disk FD in the cartridge 5.
It is crimped to the D _1.

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 driven to rotate by the spindle motor 21, and the center core 2 is driven to rotate by the rotation drive pin 25, thereby reducing the capacity. The floppy disk FD is rotationally driven in the cartridge 5 at a low speed of, for example, 2500 rpm. However, this time, are rotated while the upper and lower recording surfaces FD ₁ of the small-capacity floppy disk FD is in contact with the pair of upper and lower cleaning sheets 15 in the cartridge 5, the cleaning sheet 1 of the upper and lower
5 by upper and lower recording surfaces FD ₁ of the small-capacity floppy disk FD is automatically cleaned. Then, the carriage 26 and the head arm 27 are horizontally driven in the directions of the arrows a and b integrally by a head moving mechanism (not shown), so that the pair of upper and lower magnetic heads 28 and 29 move the small-capacity floppy disk FD to the arrow a. , B, and data is recorded and reproduced on the small-capacity floppy disk FD.

The small-capacity floppy disk drive F of the small-capacity floppy disk cartridge FDC after recording and reproduction of the small-capacity floppy disk FD
Unloading operation to DD out is done in the reverse operation of the loading operation described above, up position shown by a chain line from the down position P ₆ shown in FIG. 13 in solid lines by a small capacity floppy disk cartridge FDC cartridge loading mechanism when vertically it is raised in the arrow h direction parallel movement to P _5, together with the center core 2 is detached from the disk table 23 upward, the head arm 27
There is rotated against the head crimping spring in the arrow e direction from the down position shown in solid lines in FIG. 13 to the up position, the upper magnetic head 28 is raised in the direction of arrow e from the down position P ₅ to up position P ₄ A pair of upper and lower magnetic heads 28,
29 is detached relatively up and down outside the cartridge 5.
And a small capacity floppy disk cartridge FD
When C is pushed out horizontally in the direction of arrow b to a small capacity floppy disk drive FDD out at up position P _5, by a shutter spring 8d from the lid opening position where the shutter 8 is shown in FIG. 9 to closed position shown in FIG. 11 The cartridge is slid in the direction of arrow c, and the pair of upper and lower horizontal plate portions 8a and 8b of the shutter 8 closes the pair of upper and lower head insertion holes 7 of the cartridge 5.

[0012]

In the information society in recent years, it is desired to increase the recording capacity of this type of floppy disk cartridge without exception, and to increase the capacity of this type of floppy disk cartridge. In
It is indispensable to increase the rotation speed of the floppy disk and reduce the thickness of the magnetic film on the sub-micron order on both the upper and lower recording surfaces of the floppy disk. However, when trying to rotate a high-capacity floppy disk with a low rigidity and a high rigidity at 3600 rpm or more with a thinner structure developed for increasing the recording capacity as described above, a divisional vibration (waving phenomenon) having a large amplitude is likely to occur. Become. In the conventional small-capacity floppy disk cartridge FDC using the conventional 3.5-inch small-capacity floppy disk FD, since the thickness of the cartridge 5 is as thin as about 3 mm, rigidity is low and deformation is easy. an inner wall surface 3b of the shell 3 and 4, will be the clearance C ₁ is easily changed between 4b, rotation becomes unstable contact state of the high capacity floppy disk for the pair of upper and lower cleaning sheets 15 becomes unstable,
This causes a reduction in the head output such as a deterioration in the S / N ratio due to the spacing loss. Also, due to the divided vibration of the large-capacity floppy disk, a head hitting phenomenon occurs in which the large-capacity floppy disk hits a pair of upper and lower magnetic heads 28 and 29, and both the large-capacity floppy disk and the magnetic heads 28 and 29 are hit. The durability is significantly reduced.

Further, there are already hundreds of millions of small-capacity floppy disk drives on the market, and a newly developed large-capacity floppy disk cartridge is erroneously inserted into an existing small-capacity floppy disk drive. The danger of being done is unavoidable. If the large-capacity floppy disk cartridge is erroneously inserted into the small-capacity floppy disk drive, as described with reference to FIG. There is the danger that the newly developed thin, low-rigidity, high-capacity floppy disk may be easily damaged by the impact of pressing the recording surfaces with the head pressing spring, and the tracks of the high-capacity floppy disk There is a risk that narrow data may be destroyed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to provide a large-capacity floppy disk cartridge in which erroneous insertion into an existing small-capacity floppy disk drive is prohibited. I have.

[0015]

According to the present invention, there is provided a large-capacity floppy disk cartridge in which a large-capacity floppy disk is rotatably housed. It is composed.

Normally, in this type of floppy disk drive, the cartridge insertion slot is formed as small as possible in accordance with the external dimensions of the floppy disk cartridge. It is impossible to erroneously insert a large capacity floppy disk cartridge having a thickness of about 4 mm or more into an existing small capacity floppy disk drive using a floppy disk cartridge.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a large-capacity floppy disk cartridge to which the present invention is applied is shown in FIGS.
This will be described with reference to FIG. The same components as those in FIGS. 9 to 13 are denoted by the same reference numerals, and the description will not be repeated.

First, as shown in FIGS. 1 to 3, a large capacity floppy disk cartridge HFDC of the present invention
An upper and lower shell 43 formed of 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 stainless steel;
The cartridge is rotatably housed in a cartridge 45 constituted by 44. The recording capacity of the large-capacity floppy disk HFD is 100 MB or more, preferably 3 MB.
To improve the 00～700MB, thinning the magnetic films in the upper and lower recording surfaces HFD ₁ of the high capacity floppy disk HFD to submicron order, and the rotational speed of the high capacity floppy disk HFD 3600 rpm
It is possible to raise the rotation speed to the high-speed rotation range described above.

On the other hand, this large-capacity floppy disk cartridge HFDC records and
Large capacity floppy disk drive HFDD for playback
In the above, while the compatibility with the conventional large-capacity floppy disk cartridge FDC having a recording capacity of 1 to 2 MB is established, the large-capacity floppy disk cartridge HFDC is erroneously inserted into the small-capacity floppy disk drive FDD described above. Are set to the external dimensions to prevent the occurrence of the problem.

That is, the external dimensions of the cartridge 45 in this large-capacity floppy disk cartridge HFDC are such that the width W ₁₁ = about 90 mm and the depth D ₁₁ = about 94 mm, and the width W ₁₁ and the depth D ₁₁ are the width W ₁ and depth D ₁ of the conventional small-capacity floppy disk cartridge FDC is configured in the same size. However, the thickness of the cartridge 45 are constituted by upper and lower shells 43, 44 H ₁₁ = about 4mm or more, preferably H
₁₁ = be configured to approximately 5 mm, the thickness H ₁₁ is the thickness H ₁ than about 2mm larger conventional small capacity floppy disk cartridge FDC. That is, W ₁₁ = W ₁ ,
D ₁₁ = D ₁ , and H ₁₁ > H ₁ .

The thickness H ₁₂ of the lower shell 44 is set to about 1.5 mm among the thicknesses of the upper and lower shells 43 and 44,
The thickness H ₁₃ of the upper shell 43 is set to about 3.5 mm. The thickness T ₁₁ of the horizontal wall portion 44a of the lower shell 44
= About 0.3 mm, and the horizontal wall 43 of the upper shell 43
By configuring the thickness of a to be T ₁₂ = about 2.5 mm,
Horizontal wall 43 in disk storage space 45e
a, Clearance C between inner wall surfaces 43b, 44b of 44a
₁₁ = about 2.2 mm, which is about 2.5 mm or less. That is, C ₁₁ ≧ C ₁ is established. On the inner wall surfaces 43b and 44b, a pair of upper and lower cleaning sheets 15 and the like made of a nonwoven fabric or the like are laid by bonding or the like.

Therefore, this large-capacity floppy disk
Cartridge HFDC, the thickness H ₁₁ is a conventional small-capacity floppy disk cartridge Despite is configured thicker than FDC, the thickness H ₁₂ and the thickness T ₁₁ of the horizontal wall portion 44a of the lower shell 44, and further , Disk storage space 4
The inner wall surface 43a, the clearance C ₁₁ between 44a is of a conventional small-capacity floppy disk cartridge FDC thickness H _1/2 in the 5e, the thickness T ₁₁ and clearance C ₁
Which is configured in the same size as the disk surface position of the small-capacity floppy disk FD of the inside cartridge 5 disk surface position P ₁₂ of the high capacity floppy disk HFD is of the conventional small-capacity floppy disk cartridge FDC in the cartridge 45 and it is configured to be placed at the same height H ₁₂ and P _2. That is, H ₁₂ = H ₁ /
2.

On the other hand, in the large-capacity floppy disk cartridge HFDC, the horizontal wall 43
a wall thickness T ₁₂ wall thickness T ₁ than about 2.2mm of the horizontal wall portion 3a of the upper shell 3 of a conventional small-capacity floppy disk FD
Due to the enlargement (T ₁₂ −T ₁ = 2.5−0.3 = 2.2 mm), the rigidity and strength of the upper shell 43 are increased by several tens of times compared to the conventional case. Accordingly, the cartridge 45 of the large-capacity floppy disk cartridge HFDC has a structure in which the lower shell 44 is sufficiently reinforced by the high rigidity and high strength upper shell 43, and the entire cartridge 45 has high rigidity and high strength. be configured, the deformation of the cartridge 45 is very small, and is configured to be able to keep the inner wall surface 43 b, a clearance C ₁₁ between 44b very stable good. However, in order to prevent distortion of the upper shell 43 during injection molding with a synthetic resin, a number of rib grooves (or ribs) 43d are formed on the inner wall surface 43b of the upper shell 43 to make the wall thickness uniform. ing.

Next, this large-capacity floppy disk cartridge HFDC is
A pair of upper and lower head insertion holes 47a formed in 3, 44;
The upper head insertion hole 47a, which is the other head insertion hole of the cartridge 45b, extends from the horizontal wall 43a of the upper shell 43 to the outer peripheral wall of the horizontal wall 43a.
Front vertical wall portion 43c which is a vertical wall portion on the front end surface 45a side of
Is cut out in a shape bent at a right angle. Then, a lower head insertion hole 47 which is one of the head insertion holes.
b is a conventional large-capacity floppy disk cartridge F
Like the DC, the lower shell 44 is formed horizontally on the horizontal wall portion 44a. The upper shutter hole 48e, which is the other of the pair of upper and lower shutter holes 48e and 48f formed in the shutter 48 having a substantially U-shaped cross section, is located between the upper horizontal plate portion 48a and the front end. The lower shutter hole 48f which is notched in a shape bent at right angles over the vertical plate portion 48c, and which is one of the shutter holes, is horizontal to the lower horizontal plate portion 48b similarly to the conventional small-capacity floppy disk cartridge FDC. It is formed in a shape. And these upper head insertion holes 4
7a and the front end vertical wall portion 43c of the upper shutter hole 48e.
And a front end portion 47 notched up to the front end vertical plate portion 48c.
a _1, a common height position P ₁₃ of the 48e ₁ cartridge 4
5 of the lower surface 45g is set to less than or equal to a height H ₁₄ of about 3 mm.

Next, as shown in FIG. 4, a large-capacity floppy disk drive HFDD, which is an upper disk drive for recording and reproducing the large-capacity floppy disk cartridge HFDC, is a conventional small-capacity floppy disk cartridge FDC. Compatible lower magnetic head 2 in a pair of upper and lower magnetic heads 28 and 29
The reference height position P ₃ with respect to the mechanical base 9 and the up position P ₄ and the down position P ₅ where the upper magnetic head 28 is raised by the height H _{2 with} respect to the lower magnetic head 29 are set to be the same. Therefore, this large capacity floppy disk
According to the drive HFDD, the conventional small-capacity floppy disk cartridge FDC can be loaded in exactly the same manner as described with reference to FIG. 13, and the internal small-capacity floppy disk FD can be recorded and reproduced.

Next, when loading the large-capacity floppy disk cartridge HFDC into the large-capacity floppy disk drive HFDD, first, FIG.
In as indicated by the one-dot chain line, the high capacity floppy disk cartridge HFDC conventional small capacity height relative floppy disk cartridge FDC and just as the lower magnetic head 29 H ₃ as high was the up position P ₅ after inserting horizontally from the direction of the arrow a, to position descends vertically in the direction of arrow g of this high capacity floppy disk cartridge HFDC to down position P ₆ as indicated by a solid line in FIG. 13.

[0027] At this time, as shown in FIG. 3, the thickness H ₁₁ of the high capacity floppy disk cartridge HFDC of the cartridge 45 is the thickness H ₁ than about 2mm larger conventional small capacity floppy disk cartridge FDC for that, the upper surface 45f of the high capacity floppy disk cartridge HFDC of the cartridge 45 will be inserted horizontally from the direction of the arrow a in by a height H ₅ higher position relative to the lower end of the upper magnetic head 28.

However, the upper shutter hole 48e and the upper head insertion hole 47a formed in the cartridge 45 and the shutter 48 are connected to the front end vertical plate portion 48c.
And a front end portion which is notched to a shape bent at a right angle to the front end vertical wall portion 43c, and is cut off to the front end vertical plate portion 48c and the front end vertical wall portion 43c of the upper shutter hole 48e and the upper head insertion hole 47a. 48e ₁ , 43
The common height position P _{13 of a} is the lower surface 45 of the cartridge 45.
Since conventional are set thickness H ₁ below the small-capacity floppy disk cartridge FDC is about 3mm or less from g, inserted horizontally from the direction of the arrow a the high capacity floppy disk cartridge HFDC is to up position P ₅ At this time, the upper magnetic head 28 is relatively smoothly inserted into the upper shutter hole 48e and the upper head insertion hole 47a from the direction of arrow b. Therefore, this large-capacity floppy disk cartridge HF
DC can be inserted horizontally smoothly from the direction of the arrow a to the up position P ₅ without any way interfering with the upper magnetic head 28.

[0029] Then, as shown by the solid line in FIG. 3, when the high capacity floppy disk cartridge HFDC is lowered vertically in the direction of arrow g from the up position P ₅ to the down position P _6, a conventional small-capacity floppy disk cartridge FDC exactly Similarly, the center core 2 of the high capacity floppy disk HFD is chucked on the disc table 23, the arrows from the upper magnetic head 28 up position P ₄ in the cartridge 45 to the down position P ₅ f And the lower magnetic head 29 is relatively inserted into the cartridge 45 through the lower shutter hole 48f and the lower head insertion hole 47b in the direction of the arrow h, and the pair of upper and lower magnetic heads 28 and 29 is inserted into the cartridge 45. Pressure bonding on both upper and lower recording surfaces HFD ₁ of large capacity floppy disk HFD inside Is done.

As described above, the large capacity floppy disk
When the loading operation of the large-capacity floppy disk cartridge HFDC into the drive HFDD is completed, the large-capacity floppy disk HFD is rotated by the spindle motor 21 via the disk table 23 at a high-speed rotation speed of 3600 rpm or more. The large-capacity floppy disk HFD is scanned in the directions of arrows a and b by the magnetic heads 28 and 29 of FIG.
High-density recording and reproduction are performed with a narrow track width of several microns such as 5 microns, and a recording capacity of 300 to 700 MB of the large-capacity floppy disk HFD can be realized. The large-capacity floppy disk drive HF of the large-capacity floppy disk cartridge HFDC after recording and reproduction of the large-capacity floppy disk HFD
The unloading operation to the outside of the DD is performed in the reverse operation of the loading operation just like the conventional small-capacity floppy disk cartridge FDC.

Incidentally, a large-capacity floppy disk HF
When D is rotated at a high speed of 3600 rpm or more,
Although large splitting oscillation amplitude (waving) easily occurs, the thickness of the cartridge 45 H ₁₁ = optionally be configured to approximately 5 mm, the thickness T ₁₂ = about 2.5mm of the horizontal wall portion 43a of the upper shell 43 the thickened enough, the cartridge 45 is highly rigid, it is configured to a high strength, and the horizontal wall portion 43a of the upper and lower shells 43 and 44, the inner wall surface 43b of the 44a, the clearance C ₁₁ between 44b conventional by being narrowed configuration to the same about 2.2mm as the clearance C ₁ of a small capacity floppy disk cartridge FDC, it is possible to secure the clearance C ₁₁ = about 2.2mm stable, a pair of upper and lower cleaning The contact state of the large-capacity floppy disk HFD with the sheet 15 is stabilized, and the above-mentioned divided vibration is applied to the large-capacity floppy disk HFD. Command does not occur. Accordingly, a decrease in the head output such as a deterioration in the S / N ratio due to the spacing loss does not occur, and high-density recording and reproduction can be performed with high accuracy, and a head hitting phenomenon does not occur. Capacity floppy disk HFD and magnetic heads 28 and 29
Can also be improved in durability.

The large-capacity floppy disk
Since the width W ₁₁ and the depth D ₁₁ of the cartridge HFDC are the same as those of the conventional small-capacity floppy disk cartridge FDC (W ₁₁ = W ₁ , D ₁₁ = D ₁ ), this large-capacity floppy disk cartridge HF
A large-capacity floppy disk drive HFDD compatible with DC and a conventional small-capacity floppy disk cartridge FDC can be realized. That is, while the conventional small-capacity floppy disk cartridge FDC as the lower disk cartridge can be inserted into the large-capacity floppy disk drive HFDD as the upper disk drive, the cartridge 45 of the large-capacity floppy disk cartridge HFDC can be inserted. Thickness H
₁₁ is a conventional small capacity floppy disk cartridge F
By configured thicker than the thickness H ₁ of the cartridge 5 of the DC, prohibit erroneous insertion of the high capacity floppy disk cartridge HFDC with the upper disc cartridge to the lower disc is the drive of a conventional small-capacity floppy disk drive in FDD can do. Therefore, this large-capacity floppy disk cartridge HF
DC is conventional small capacity floppy disk drive FD
D is erroneously inserted into D, and a pair of upper and lower magnetic heads 28 and 29
The magnetic film thinly formed on the sub-micron order on both upper and lower recording surfaces HFD ₁ of the large-capacity floppy disk HFD may be damaged, or the track width of the large-capacity floppy disk HFD may be reduced to several microns. Can be prevented beforehand, and high security can be ensured.

Next, in the high capacity floppy disk cartridge HFDC, the high capacity floppy disk track width of the data recorded in the upper and lower recording surfaces HFD ₁ of HFD narrow and several microns context of the present invention, both of these records Even if dust having a size of several microns adheres to the surface HFD ₁ , not only does the head output decrease, such as deterioration of the S / N ratio due to spacing loss, but also both upper and lower recording of the large capacity floppy disk HFD. The magnetic film thinned to the submicron order on the surface HFD ₁ is easily damaged by scratches and the like by the dust, and the durability of the large-capacity floppy disk HFD is significantly impaired.

Therefore, in the large-capacity floppy disk cartridge HFDC of the present invention, a dust collecting filter 51 for reliably removing dust and the like having a size of several microns that has entered the cartridge 45 is housed in the cartridge 45. ing. That is, FIGS. 1 to 3, 5 to 7, the dust collecting filter 51 by effectively utilizing the thickness H ₁₃ = about 3.5mm on the shell 43 of the cartridge 45, on the shell 43 within the thickness H ₁₃ in the, and, are incorporated near the outer circumference position of the high capacity floppy disk HFD. Accordingly, the external dimensions of the cartridge 45 are not increased by incorporating the dust collecting filter 51 therein, and the space factor in the cartridge 45 is high. The dust collecting filter 51 includes a dust collecting passage 53 in which a dust collecting material 52 capable of reliably adsorbing or adhering dust or the like having a size of several microns is housed. An air inlet 54 is opened at one end and arranged at the outer peripheral position of the large capacity floppy disk HFD in the disk storage space 45e. Of clean air from which high-capacity floppy disk HFD has been removed
And an air outlet 55 that flows out onto the upper recording surface HFD _{1 of the} recording medium.

Therefore, this large-capacity floppy disk
According to the cartridge HFDC, as shown in FIGS. 5 to 7, during recording and reproduction, the large-capacity floppy disk HFD is stored in the disk storage space 5e of the cartridge 45.
During high-speed rotation at a rotational speed of, for example, 3600 rpm or more in the direction of arrow i, the air flow Ai generated mainly in the outer peripheral portion of the large-capacity floppy disk HFD is collected from the air inlet 54 of the dust collection filter 51. Passage 53
Flows into. Then, the air flow Ai that has flowed into the dust collection passage 53 passes through the dust collection material 52 and is converted into clean air CA, and flows out from the air outlet 55 onto the upper recording surface HFD ₁ of the large-capacity floppy disk HFD. (Blowing out)
Will be done.

Therefore, even if dust or the like having a size of several microns enters the cartridge 45, the dust or the like mixes with the airflow Ai and is collected by the dust collecting filter 51 when the large-capacity floppy disk HFD is driven at a high speed. The dust or the like is reliably flown into the dust collection passage 53, and the dust or the like is adsorbed or adhered to the dust collecting material 52 housed in the dust collection passage 53, thereby being reliably removed. Then, the clean air CA from which dust and the like have been removed by the dust collecting material 52 is blown out onto the upper recording surface HFD ₁ of the large-capacity floppy disk HFD. Dust and the like can be removed with high efficiency and certainty.
The air in e can always be kept as clean air CA.

Accordingly, during recording and reproduction, dusts of several microns enter between the upper and lower recording surfaces HFD ₁ of the large-capacity floppy disk HFD and the upper and lower magnetic heads 28 and 29, resulting in a spacing loss. or cause a decrease in head output, the inconveniences damage would give such scratches on the upper and lower recording surfaces HFD ₁ can be prevented. As described above, the large-capacity floppy disk cartridge HFDC of the present invention has the built-in dust collecting filter 51 capable of reliably removing dust and the like having a size of several microns. The cleaning performance is not particularly required, and the pair of upper and lower cleaning sheets 15 can be replaced with a material for improving the stable rotation performance during high-speed rotation of the large-capacity floppy disk HFD.

Next, as shown in FIGS. 1, 2, 5 and 7, the large-capacity floppy disk cartridge HFDC of the present invention can maintain the dust collecting performance of the dust collecting filter 51 semipermanently. In addition, the dust collecting material 52 is configured to be replaceable. That is, a dust-collecting material exchange port 56 is opened in the upper surface 45 of the upper shell 43 of the cartridge 45, and an opening / closing lid 57 is detachably attached to the dust-collecting material exchange port 56.
Then, the dust collecting material 52 is transferred from the dust collecting material exchange port 56 to the dust collecting passage 5.
3 and positioned by the positioning portion 58,
7 is removably attached to the dust-collecting material exchange port 56 so that the dust-collecting material exchange port 56 is sealed.

Therefore, according to the dust collecting filter 51, a large capacity floppy disk cartridge HFDC
When a certain amount of dust or the like is collected in the dust collecting material 52 due to use for a certain period of time and the dust collecting performance is deteriorated, the opening / closing lid 57 is removed and the dust collecting material exchange port 56 is opened. Since the dust collecting material 52 can be replaced with a new one, the dust collecting performance of the dust collecting filter 51 can be restored and dust having a size of several microns can always be reliably removed. At this time, the opening / closing lid 57 can be easily attached / detached by forming an insertion recess 57a such as a nail at the outer end of the opening / closing lid 57.

FIG. 8 shows a modification of the arrangement of the dust collecting filter 51. This dust collecting filter 51 is provided on the outer periphery of the large-capacity floppy disk HFD at four corners 11a, 11
b, 11c, and 11d can be stored in one, a plurality, or all of them.
By arranging at a plurality of locations, the performance of collecting dust and the like can be improved. At this time, the air inlet 54 and the air outlet 55 of these dust collecting filters 51 are arranged in the respective corners 11a, 11b, 11c and 11d to make these dust collecting filters 51 compact. It is possible.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical concept of the present invention. For example, in the above-described embodiment, the thickness of the upper shell 43 of the cartridge 45 is eliminated and the thickness of the lower shell 44 is reduced. However, the reverse configuration may be adopted, or the thickness of the upper and lower shells 43 and 44 may be reduced. 1 / th of thickness
2 can be configured. Also, the shutter 48
The pair of upper and lower shutter holes 48e and 48f are not necessarily required.

[0042]

The large-capacity floppy disk cartridge of the present invention constructed as described above has the following effects.

The large capacity floppy disk cartridge according to the first aspect of the present invention is configured such that the thickness of the cartridge accommodating the large capacity floppy disk is about 4 mm or more.
Since it is possible to prohibit erroneous insertion into an existing small-capacity (lower-order) floppy disk drive, this large-capacity floppy disk cartridge is erroneously inserted into a small-capacity floppy disk drive, and is thin. In addition, it is possible to prevent a large-capacity floppy disk having low rigidity from being damaged or to destroy data having a narrow track width, thereby ensuring high security.

According to the large-capacity floppy disk cartridge of the present invention, the thickness of one of the upper and lower shells of the cartridge is reduced and the thickness of the other shell is increased. Since it can be realized and deformation of the cartridge can be prevented as much as possible, the large-capacity floppy disk can be driven at a high speed such as 3600 rpm or more without almost any splitting vibration (undulation phenomenon) in the large-capacity floppy disk. And a stable rotation can be realized, and a recording capacity of 100 MB or more of a large capacity floppy disk can be realized.

The large-capacity floppy disk cartridge of the third aspect has a clearance between the upper and lower shells in the disk storage space of the cartridge of 2.5 m, which is substantially equal to that of the conventional small-capacity floppy disk cartridge.
m, when the large-capacity floppy disk is rotated at a high speed in the cartridge, the large-capacity floppy disk hardly generates a splitting vibration (undulation phenomenon), and the large-capacity floppy disk is moved to 3600 rpm or more. And the like, and can stably rotate at a high speed, and can realize a recording capacity of 100 MB or more of a large-capacity floppy disk.

In the large-capacity floppy disk cartridge according to the present invention, one of the pair of upper and lower head insertion holes of the cartridge is formed horizontally on the horizontal wall of one of the thin shells. Since the other head insertion hole is cut out so as to be bent at right angles from the horizontal wall portion of the other thick shell to the front vertical wall portion, the large capacity for recording and reproducing a large capacity floppy disk ( The high-capacity (upper) floppy disk cartridge and the small-capacity (lower) floppy disk cartridge in the upper (upper) floppy disk drive can be made compatible.

In the large-capacity floppy disk cartridge according to the fifth aspect, one of the shutter holes is formed horizontally in one horizontal plate portion, and the other shutter hole is formed vertically from the other horizontal plate portion to the front end. The large-capacity (high-order) floppy disk cartridge for recording and reproducing a large-capacity floppy disk and the small-capacity (high-capacity) (Lower) Floppy disk cartridge compatibility can be achieved.

In the large-capacity floppy disk cartridge according to the sixth aspect, the front end vertical wall side end of the other head insertion hole cut into a shape bent at a right angle has a height of about 3 mm or less from the lower surface of the cartridge. The high-capacity (high-order) floppy disk cartridge in the large-capacity (high-order) floppy disk drive that records and plays back large-capacity floppy disks is compatible with the small-capacity (low-order) floppy disk cartridge. be able to.

According to a seventh aspect of the present invention, there is provided a large-capacity floppy disk cartridge wherein the other end of the other shutter hole, which is notched in a right-angled bent shape, on the side of the front end vertical wall has a height of about 3 mm or less from the lower surface of the cartridge. The compatibility of a large-capacity (upper) floppy disk cartridge in a large-capacity (upper) floppy disk drive for recording and reproducing a large-capacity floppy disk and a small-capacity (lower) floppy disk cartridge Can be.

[Brief description of the drawings]

FIG. 1 shows a large capacity floppy disk to which the present invention is applied.
FIG. 3 is a perspective view illustrating an embodiment of a cartridge.

FIG. 2 is a plan view of the high-capacity floppy disk cartridge according to the first embodiment;

FIG. 3 is an enlarged cross-sectional side view of the large-capacity floppy disk cartridge according to the first embodiment, taken along line AA of FIG. 2;

FIG. 4 is a partially cutaway side view illustrating a main part of a large-capacity floppy disk drive for recording and reproducing the large-capacity floppy disk cartridge according to the first embodiment.

FIG. 5 is an enlarged cross-sectional plan view illustrating a dust collecting filter in the high-capacity floppy disk cartridge according to the first embodiment.

6 is a cross-sectional side view taken along the line BB of FIG. 5;

FIG. 7 is a cross-sectional side view taken along the line CC of FIG. 5;

FIG. 8 is a plan view illustrating a modification of the arrangement of the dust collecting filter in the high-capacity floppy disk cartridge according to the first embodiment.

FIG. 9 is a perspective view illustrating a conventional small-capacity floppy disk cartridge.

FIG. 10 is an exploded perspective view of the same small-capacity floppy disk cartridge.

FIG. 11 is a plan view and a side view of the same small-capacity floppy disk cartridge.

FIG. 12 is an enlarged cross-sectional side view of the large-capacity floppy disk cartridge according to the first embodiment, taken along the line DD in FIG. 11;

FIG. 13 is a partially cutaway side view for explaining a main part of a conventional small-capacity floppy disk drive for recording and reproducing the small-capacity floppy disk cartridge of the above.

[Explanation of symbols]

HFDC is a large capacity floppy disk cartridge,
HFD is a small-capacity floppy disk, HFD ₁ is a recording surface, HFDD is a large-capacity floppy disk drive,
43 is the upper shell, 43a is the horizontal wall of the upper shell, 43b
Is the inner wall surface of the horizontal wall, 43c is the vertical wall at the front end of the upper shell, 44 is the lower shell, 44a is the horizontal wall of the lower shell, 4
4b is the inner wall surface of the horizontal wall, 45 is the cartridge, 45e
Is a disk storage space, 45g is a lower surface of the cartridge, 47a is a head insertion hole formed by being bent at a right angle, 47b is a head insertion hole formed in a horizontal shape, 47b
₁ is the front edge of the head insertion hole, 48 is the shutter, 48a
Is the upper horizontal plate portion of the shutter, 48b is the lower horizontal plate portion of the shutter, 48c is the front vertical plate portion of the shutter, 48
e is a shutter hole formed by being bent at a right angle, 48
shutter hole, H ₁₁ f is formed in a horizontal shape and the thickness of the cartridge, H ₁₂ are the lower shell thickness, H ₁₃ are the upper shell thickness, C ₁₁ clearance, H ₁₄ is bent at a right angle shape This is the height of the front end of the formed head insertion hole and shutter hole.

Claims (7)

[Claims] A large-capacity floppy disk is rotatably housed in a cartridge, and a pair of upper and lower head insertion holes formed in upper and lower shells of the cartridge are configured to be openable and closable by shutters having a substantially U-shaped cross section. A large-capacity floppy disk cartridge characterized in that the thickness of the cartridge is increased to about 4 mm or more. 2. The large-capacity floppy disk drive according to claim 1, wherein one of the upper and lower shells of the cartridge has a small thickness and the other has a large thickness. cartridge. 3. The clearance between the upper and lower shells in the disk storage space of the cartridge is about 2.5 mm.
2. The large-capacity floppy disk cartridge according to claim 1, wherein the cartridge is configured as follows. 4. A head insertion hole of a pair of upper and lower head insertion holes of the cartridge is formed horizontally on a horizontal wall of one of the thin shells, and the other head insertion hole is formed of the thicker head insertion hole. 3. The large-capacity floppy disk cartridge according to claim 2, wherein the other thick shell is notched in a shape bent at a right angle from the horizontal wall portion to the front end vertical wall portion. 5. One of a pair of upper and lower shutter holes of the shutter is formed horizontally on one horizontal plate portion so as to face the one horizontal head insertion hole,
That the other shutter hole is notched in a shape bent at a right angle from the other horizontal plate portion to the front end vertical plate portion so as to face the other head insertion hole bent and cut at the right angle. 5. The large-capacity floppy disk cartridge according to claim 4, wherein: 6. The front end vertical wall side end of the other head insertion hole cut out in a right-angled bent shape is set to a height of about 3 mm or less from the lower surface of the cartridge. The large-capacity floppy disk cartridge according to claim 4, wherein 7. The cartridge according to claim 7, wherein the other end of the other shutter hole, which is cut in a right angled shape, on the side of the vertical plate is set to a height of about 3 mm or less from the lower surface of the cartridge. A high-capacity floppy disk cartridge according to claim 5.