JPH0135348Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disk cartridge in which a disk is rotatably housed in a disk case, and the hub constituting the disk is improved.

That is, FIGS. 1 and 2 show typical examples of disk cartridges to which the present invention is applied, which basically consists of a disk case having a drive shaft insertion window 3 and a magnetic head insertion window 4. 1
and a disk 2 that is rotatably installed inside the disk case 1, and the disk 2 is a disk-shaped seat 9.
and a hub 10 that is integrally connected to the center of the seat 9 and faces the drive shaft insertion window 3. As shown in FIGS. 15 and 18, the hub 10 has a support shaft insertion hole 14 in the center. Guide groove 1 on the upper and lower end surfaces of 10
5 and 15 are recessed around the hub center P, and each guide groove 15 is provided with an engaging rib 16 that crosses it. On the disk drive side, a hub holder 17 with a support shaft 19 and a drive shaft 20 protruding from it, and a collet 21 are installed in a vertically opposed manner, and when a disk cartridge is loaded into the disk drive, the hub 1
The upper and lower end surfaces of 0 are clamped by the hub receiving surface 18 of the hub holder 17 and the tip end surface of the collet 21, the support shaft 19 is engaged in the support shaft insertion hole 14, and the drive shaft 20 is inserted into the guide groove 1.
5 and abuttingly engages with the engagement rib 16, thereby rotating the disk 2.

In such a drive mode, it is necessary to properly clamp and hold the upper and lower end surfaces of the hub 10 between the hub pedestal 17 and the collet 21 to prevent uneven contact.

Therefore, the present applicant has developed a disk cartridge that enables double-sided recording on sheet 9.
The first reference surface for the hub cradle is placed on the upper and lower end surfaces of the
A configuration was considered in which a second reference surface for the collet is formed on the inside, and a guide groove 15 and an engagement rib 16 are arranged between the first reference surface and the second reference surface. However, if the protruding heights of the first reference surface, the second reference surface, and the engaging rib 16 are set carelessly, the hub receiving surface 18 of the hub holder 17 will not reach the second reference surface and the engaging rib 16. The collet 21 may come into contact with the protruding end surface of the collet 21 and not properly contact the first reference surface, or the tip surface of the collet 21 may come into contact with the protruding end surface of the engaging rib 16 even if it does not contact and interfere with the first reference surface. The second reference surface may not be brought into proper contact with the second reference surface. As a result, it has been found that a problem may arise in which the hub pedestal 17 and the collet 21 come into partial contact with the upper and lower end surfaces of the hub 10.

From this point of view, this invention sets the arrangement positions and protruding heights of the first reference plane, the second reference plane, and the engagement rib 16 formed on the upper and lower end surfaces of the hub 10 in a constant relationship, and When the cartridge is loaded into the disk drive, the hub receiving surface 18 of the hub holder 17 properly contacts the first reference surface on one end surface of the hub, and the tip surface of the collet 21 correctly contacts the second reference surface on the other end surface of the hub. This is intended to enable the hub holder 17 and the collet 21 to securely clamp and hold the upper and lower end surfaces of the hub 10.

The details will be explained below based on the drawings.

In FIGS. 1 and 2, the disc cartridge of the present invention is made of plastic upper and lower cases 1.
The disc case 1 is made up of a flat hard disk case 1 in which the lids a and 1b are joined together by ultrasonic welding at several points, and a magnetic disk 2 is rotatably installed inside the disk case 1.

The disk case 1 has a drive shaft insertion window 3 located approximately in the center near the front thereof, and a magnetic head insertion window 4 located in front of the drive shaft insertion window 3 and long from front to back.
and a small diameter index hole 5 located behind the drive shaft insertion window 3. These windows and holes are provided vertically through each other.

The disk 2 consists of a disk-shaped magnetic sheet 9 having a circular hole 8 in the center, and a hub 10 that clamps the periphery of the central hole 8 of the sheet 9.

In FIGS. 11 and 12, the hub 10 is formed by integrally joining an upper hub component 12 and a lower hub component 13, which are molded separately from plastic, in the manner described later, and a support shaft is inserted in the center. It has a hole 14 and annular guide grooves 15, 15 on the upper and lower outer end surfaces.
is formed in a recessed manner on the outer periphery around the hub center P, and an engaging rib 16 is formed at one location in the circumferential direction of each of the guide grooves 15 to cross the guide groove 15 at a vertically symmetrical position.

12 and 18, on the disk drive side, a support shaft 19 is provided high in the center on the hub receiving surface 18 of the hub holder 17, and a drive shaft 20 is protruded low at one location on the outer periphery. 17, and when the disc cartridge of the present invention is loaded into the disk drive, the receiving surface 18 of the hub pedestal 17 and the tip of the collet 21 are inserted through the drive shaft insertion window 3 of the disk case 1. The upper and lower end surfaces of the hub 10 are fitted and held by the surfaces, and the support shaft 1
9 enters the support shaft insertion hole 14, and the drive shaft 20 engages in the guide groove 15. As the hub holder 17 rotates, the drive shaft 20 that has entered the guide groove 15 comes into contact with the engagement rib 16 as shown in FIG. 15, and the disk 2 is thereby rotationally driven. The disc cartridge of the present invention uses a sheet 9 capable of double-sided recording, and is based on the premise that the disc case 1 is used upside down, so the hub 10 is also basically vertically symmetrical. .

Next, the upper and lower hub components 1 that constitute the hub 10
2 and 13, in FIGS. 5, 9, and 17, on the opposing surfaces of both 12 and 13, at positions near the outer periphery, there are annular sheet clamping surfaces 23 that abut against each other, 24 is hub center P
It is formed concentrically and protrudingly. On the upper surface of the lower hub structure 13, tall welding pins 25 and short sheet positioning pins 26 are placed inside the tape clamping surface 24, four each on the inner and outer circumferential lines concentric with the hub center P. The upper hub structure 1 is alternately protruded.
2 is transparently provided with a through hole 27 into which each welding pin 25 fits. Each sheet positioning pin 26 is slightly higher than the tape clamping surface 24, and the outer circumferential surface of the pin is located on the outer side of the welding pin 25 in the radial direction. When assembling the disk 2, first install the lower hub component 13.
The sheet 9 is placed on the upper surface, and the sheet 9 is positioned by making the periphery of the sheet center hole 8 circumscribe each positioning pin 26 as shown in FIG.
The peripheral edge of the central hole is adhesively fixed to the sheet clamping surface 24 to prevent the sheet 9 from rotating. Next, the upper hub structure 12 is superimposed on the lower hub structure 13, and each welding pin 25 is inserted into each through hole. 27 so that the upper end of each welding pin 25 faces the upper end surface of the upper hub component 12, specifically, the guide groove 15, and as shown in FIG. Both hub components 12 and 13 are caulked and connected by melting using a sonic welding method. In this state, the peripheral edge of the center hole of the seat 9 is clamped only by the seat clamping surfaces 23 and 24 of both hub components 12 and 13, and both hub components 12 and
A gap g is formed between the sheet clamping surfaces 23 and 24 on the outer peripheral end side. Therefore, even if there is a failure in the sheet holding by both hub components 12 and 13, this will not affect the sheet portion coming out from the hub 10.
Further, since each positioning pin 26 is located outside each welding pin 25, even if the welding margin during welding of each welding pin 25 wraps around between both hub components 12 and 13, it will not reach the periphery of the center hole of the seat 9. Not enough,
This also prevents the sheet 9 from being deformed.

In FIGS. 3 to 6, the lower hub structure 13 has a hole 29 in the center, and the hole 29
A fan-shaped wall 30 extending 150 degrees in the circumferential direction is formed to project from a part of the inner periphery of the hole toward the center of the hole. is erected upwards.

Two circumscribed surfaces 32 are provided on the inner surface of the peripheral wall portion 31 and are in line contact with the circular outer peripheral surface of the support shaft 19 at two points P ₁ and P ₂ .
32 is formed perpendicularly with a constant angle θ (90° in the illustrated example), and these circumscribed surfaces 32, 32 are symmetrical with respect to the axis of symmetry L passing through the hub center P, and the upper and lower surfaces of the hub 10 It has a vertical length that approximately corresponds to the width.
On the upper and lower surfaces of the overhanging wall 30, the peripheral wall portion 31
The guide groove 1 is formed on the outer side of both circumscribed surfaces 32, 32.
A space for meat relief 33, 3 between the inner wall portion 34 of 5
3 are each formed in a recessed manner, and the thickness of the peripheral wall portion 31 is adjusted in this space 33 to prevent sink marks from occurring particularly on the circumscribed surfaces 32, 32 during plastic molding.

An arm 36 curved in an arc with the hub center P as the center of curvature is extended in a cantilevered manner from one end surface 35 of the projecting side of the overhanging wall 30 .
A block-shaped movable member 37 is integrally molded at the free end of the movable member 37. This movable member 37 is located at a position facing the peripheral wall portion 31, has a vertical length approximately corresponding to the vertical width of the hub 10, and has a protruding curved surface 38 formed on the inner surface facing the center of the hub. 38
makes a line contact with the outer periphery of the support shaft 19 at one point _P3 .

7 to 10, the upper hub structure 12 has a hole 39 in the center into which the peripheral wall portion 31 of the lower hub structure 13 fits, and A partial boss 40 that fits into the hole 29 of the side hub structure 13 projects in the circumferential direction with an expanding angle of 180 degrees. This part boss 4
Reference numeral 0 denotes a series of inner wall portions 34 forming the inner wall of the lower guide groove 15 of the hub 10, and a part of the spindle insertion hole 14 that is formed protruding from both ends of the inner wall portion 34 in the circumferential direction toward the center of the hub. A first constituent wall 41 and a second constituent wall 42, both constituent walls 41,
A recess 43 formed between 42 and penetrating in the vertical direction
It consists of. The first constituent wall 41 is formed to have an L-shaped cross section, and has a downwardly opening recessed groove 44 that is partially arcuate in plan view.
The protruding inner end surface 45 is formed as a partially arcuate concave surface that contacts the outer periphery of the support shaft 19, and the presence of the recessed groove 44 also aims to improve the molding accuracy of the concave inner end surface 45. Recessed spaces 46, 46 are formed in the second constituent wall 42 from above and below, and the protruding inner end surface 47 thereof is also formed into a partially arcuate concave curved surface that contacts the outer periphery of the support shaft 19. Each protruding inner end surface 45, 47 of these first and second constituent walls 41, 42
Each has a vertical length extending from the upper surface of the upper hub structure 12 to almost the lower surface of the lower hub structure 13.

When the upper and lower hub components 12 and 13 are integrally connected in the manner described above, the intermediate portion of the cantilever arm 36 is connected to the first component wall 41 as shown in FIGS. 16 and 18.
The movable member 37 is inserted into the recessed groove 44 from below with an allowance for deformation in the radial direction, and the movable member 37 is also inserted into the recess 4 between the first and second constituent walls 41 and 42 with an allowance for deformation in the radial direction.
3. In this state, the protruding inner end surface 38 of the movable member 37 is aligned with the concave inner end surface 4 of both constituent walls 41 and 42.
5, 47 on the hub center P side, that is, the spindle insertion hole 1
It stands out within 4.

In such a case, the disk cartridge of the present invention is loaded into the disk drive, and the support shaft 19 is inserted into the support shaft insertion hole 14 of the hub 10 through the peripheral wall portion 31 and the first
When guided and inserted by the second constituent walls 41 and 42,
First, the protruding inner end surface 38 of the movable member 37 elastically contacts the outer periphery of the support shaft 19 and retracts into the recess 43, and the circumscribed surface of the peripheral wall portion 31 is caused by the elastic force of the cantilever arm 36 that supports the movable member 37. 32, 32 are urged into contact with the circular outer peripheral surface of the support shaft 19, and the movable outer contacts of the movable member 37
The hub 10 is elastically held in an aligned state with respect to the support shaft 19 in a three-point contact state of P ₃ and the two fixed external contacts P ₁ and P ₂ formed by the circumscribed surfaces 32 and 32. At this time, since the cantilever arm 36 has a long cantilever span, the elastic contact force of the fixed external contacts P ₁ and P ₂ with respect to the support shaft 19 is always guaranteed to be constant over a long period of time even if it is used repeatedly.

The contact surface 16b of the engagement rib 16 that crosses each guide groove 15 on the side that the drive shaft 20 comes into contact with is a line l that passes through the hub center P and is orthogonal to the symmetry axis L of both circumscribed surfaces 32, 32, as shown in FIG. and is dimensioned so that the central axis of the drive shaft 20 is on the orthogonal line l when the circular outer peripheral surface of the drive shaft 20 is in contact with the contact surface 16b. .
Therefore, even when the drive shaft 20 on the disk drive side abuts and engages with the engagement rib 16 and rotates the disk 23, both circumscribed surfaces 32, 32 are further pressed against the outer periphery of the support shaft 19. This will prevent the track from slipping.

Furthermore, in the state where the upper and lower hub components 12 and 13 are integrally coupled, there is a gap between one side end surface 35 of the peripheral wall portion 31 and the first component wall 41, and between the other side end surface 35 of the peripheral wall portion 31. Second constituent wall 42
slits 48, 4 passing through in the vertical direction between the
8 will be formed. That is, two slits 48, 48 are provided in the inner peripheral surface of the spindle insertion hole 14 in the radial direction, and between the two slits 48, 48, the circumscribed surfaces 32, 32 are aligned with respect to the axis of symmetry L passing through the hub center P. It is formed so that it is symmetrical. Therefore, the circumscribed surfaces 32, 32 are separated from the other inner circumferential surface portion of the spindle insertion hole 14 by the slits 48, 48, and the circumscribed surfaces 32, 32 are separated even in the circumferential phase.
Since the thickness of the peripheral wall portion 31 having the diameter 2 can be adjusted, it is advantageous in this respect as well to limit the circumferential surfaces 32, 32 of the inner peripheral surface of the spindle insertion hole 14 and finish the molding with high precision.

Further, on the upper and lower end surfaces of the hub 10, a first reference surface 50 for the hub pedestal 17 having a constant width in the circumferential direction is located at a trisecting point position on the protruding end surface 49a of the annular protruding outer wall 49 of each guide groove 15. An inner wall portion 34 is formed to protrude from the inner wall portion 34 and constitutes the inner wall of each guide groove 15.
A second reference surface 51 for the collet 21 having a constant width in the circumferential direction is formed protrudingly formed on the protruding end surface 34a at a trisection point position. Specifically, each guide groove 1 is formed on the upper and lower end surfaces of the hub 10 as shown in FIG.
The protruding end surface 49a of the protruding outer wall 49 of No. 5 and the protruding end surface of the second reference surface 51 are set at the same protruding height, and the protruding end surface 34a of the inner wall portion 34 of each guide groove 15 and the protruding end surface 16a of the engaging rib 16 are set to the same protruding height. and are set at the same protrusion height. Therefore, the second reference plane 51
is lower than the first reference surface 50, and the engagement rib 16 is lower than the second reference surface 51. In this case, when the disk cartridge of the present invention is loaded into the disk drive, the hub receiving surface 18 of the hub holder 17 comes into contact with the first reference surface 50, the second reference surface 51, and the engagement rib 16 on the lower end surface of the hub as shown in the figure. The tip surface of the collet 21 is in contact with the second reference surface 5 of the upper end surface of the hub without interference.
1, it contacts the engaging rib 16 without contacting and interfering with the engaging rib 16. Of course, even if the hub 10 moves to the maximum when aligning the hub 10 with respect to the support shaft 19, the collet 2
The outer periphery of the tip end surface of the first reference surface 50 does not come into contact with or interfere with the first reference surface 50.

Moreover, the upper and lower end surfaces 37a, 37a of the movable member 37
The vertical length of the movable member 37 is set such that the movable member 37 is vertically inward from the second reference surface 51 by the protrusion of the reference surface 51. Therefore, the tip end surface of the collet 21 in the figure is the upper end surface 37 of the movable member 37.
Since there is no contact interference with the movable member 37
The hub 10 operates reliably even if there are dimensional variations in each part of the hub 10, and reliably guarantees the accuracy of centering the hub 10 with respect to the support shaft 19.

Each of the second reference surfaces 51 is located between the adjacent first reference surfaces 50 and 50, and the hub holder 17 and the collet 21 clamp and hold the upper and lower end surfaces of the hub 10 in a well-balanced manner in the circumferential phase. It is becoming. Further, one of the first reference planes 50 is located on the outer side of the peripheral wall portion 31, and the first and second reference planes 50 and 51 are all symmetrical with respect to the axis of symmetry L of the circumscribed surfaces 32 and 32. Since it is set in the placement relationship,
When the movable member 37 moves the hub 10 to align it with the support shaft 19, the sliding resistance of the first reference surface 50 to the hub receiving surface 18 is made uniform in the sliding direction, so that both It is designed so that the circumscribed surfaces 32, 32 are properly urged into contact with the outer periphery of the support shaft 19.

Although the illustrated example is as described above, the present invention is not limited thereto.

For example, the hub 10 has upper and lower hub components 12 and 13.
Instead of separately molding the hub 10 and integrally joining the hub 10, the hub 10 may be integrally molded from plastic at the same time. In such a case, a sheet pasting surface may be formed at the upper and lower intermediate portions of the outer periphery of the hub 10, and the peripheral edge of the center hole of the sheet 9 may be pasted and fixed to this surface.

In addition, in the illustrated example, the protruding outer wall 4 of each guide groove 15
A first reference surface 50 is provided on the protruding end surface 49a of each guide groove 15, and a second reference surface 50 is provided on the protruding end surface 34a of the inner wall portion 34 of each guide groove 15.
Although the reference surfaces 51 are formed to protrude at appropriate intervals in the circumferential direction, the protruding end surface 49a of the outer wall 49 directly serves as the first reference surface 50, and the protruding end surface of the inner wall portion 34 directly serves as the second reference surface. 5
1, the height of these protrusions may be regulated. In particular, the reference numerals 50 and 51 used in the drawings are merely for convenience of explanation.

As explained above, according to this invention, the three protrusions of the first reference surface 50 for the hub pedestal, the second reference surface 51 for the collect, and the engagement rib 16 formed on the upper and lower end surfaces of the hub 10 The height is the second reference plane 51
is lower than the first reference surface 50, and the engagement rib 16 is set lower than the second reference surface 51.
Therefore, when the disk cartridge of the present invention is loaded into a disk drive, the hub receiving surface 18 of the hub holder 17 does not come into contact with the first reference surface 50, the second reference surface 51, or the engagement rib 16 at one end of the hub. The distal end surface of the collet 21, which is dimensioned in advance so as not to abut and interfere with the first reference surface 50, comes into contact with the engagement rib 16 without interfering with the second reference surface of the other end of the hub. It comes into contact with the surface 51,
The upper and lower end surfaces of the hub 10 can be securely clamped and held by the hub holder 17 and the collet 21 without causing uneven contact, and the rotation of the disk 2 can be made stable without wobbling.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a disk cartridge according to the present invention, and FIG. 2 is a front view of the central longitudinal section thereof. FIGS. 3 to 6 illustrate the lower hub structure of the hub, which is one of the constituent members of the present invention.
4 is a plan view, FIG. 4 is a bottom view, FIG. 5 is a cross-sectional view taken along the line A--A in FIG. 3, and FIG. 6 is a cross-sectional view taken along the line B--B in FIG. 3. 7 to 10 illustrate the upper hub structure of the hub, which is one of the constituent members of the present invention. FIG. 7 is a plan view, FIG. 8 is a bottom view, and FIG. FIG. 10 is a cross-sectional view taken along line D-D in FIG. 7. FIG. 11 is a perspective view of the upper and lower hub structures seen from above, and FIG. 12 is a perspective view of the upper and lower hub structures in a coupled state. FIG. 13 is a perspective view of the upper and lower hub structures as seen from below, and FIG. 14 is a perspective view of the upper and lower hub structures in a coupled state. Figure 15 is a plan view of the hub, Figure 16
The figure is a bottom view of the hub, Figure 17 is a sectional view taken along line E-E in Figure 15, and Figure 18 is F in Figure 15.
-F line sectional view, Fig. 19 is G- in Fig. 15
It is a sectional view taken along the G line. 1...Disk case, 2...Disk, 3...
...Drive shaft insertion window, 4...Magnetic head insertion window, 9...
...Seat, 10...Hub, 14...Spindle insertion hole,
15...Guide groove, 16...Engagement rib, 16a...
...Protruding end surface of the engaging rib, 17... Hub cradle on the disk drive side, 18... Hub cradle surface of the hub cradle,
19... Support shaft, 20... Drive shaft, 21... Collet, 31... Peripheral wall portion of support shaft insertion hole, 32... Circumscribed surface, 34... Inner wall portion of guide groove, 37... Movable member, 37a ...End face of movable member, 49...Protruding outer wall of guide groove, 50...First reference surface, 51...
...Second reference plane.

Claims (1)

[Scope of utility model registration request] A disk 2 is rotatably housed in a disk case 1 having a drive shaft insertion window 3, and the disk 2 is integrally connected to a disc-shaped seat 9 and a hub 10 facing the drive shaft insertion window 3 at the center of the seat 9. The hub 10 has a spindle insertion hole 14 in the center, and an annular guide groove 1 in the upper and lower end surfaces of the hub 10.
5 and 15 are recessed on the outer periphery around the hub center P, and an engagement rib 16 is formed at one location in the circumferential direction of each guide groove 15 to cross this, and when loaded into the disk drive, it faces the disk drive side. The upper and lower end surfaces of the hub 10 are clamped and held between the hub holder 17 and the collect 21, which are installed in the shape of a hub holder 1.
The support shaft 19 protruding from the hub receiving surface 18 of No. 7 engages in the supporting shaft insertion hole 14, and the drive shaft 20 protruding from the hub receiving surface 18 engages in the guide groove 15 to form an engaging rib. In the disk cartridge which abuts and engages with the hub 16, a hub holder 1 is provided on the upper and lower end surfaces of the hub 10.
a first reference surface 50 that the hub receiving surface 18 of No. 7 comes into contact with;
They each have a second reference surface 51 that is radially inner than the reference surface 50 and that the tip end surface of the collet 21 comes into contact with, and the engagement rib 16 is connected to the first reference surface 50 and the second reference surface 51. The second reference surface 51 is lower than the first reference surface 50, and the engagement rib 16 is located between the second reference surface 50 and the second reference surface 51.
A disk cartridge characterized in that each height is set to be lower than a reference surface 51.