JPS6069871A - Disc cartridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] This invention provides a disk case in which a disk is rotatably housed, and this disk is connected to a disk-shaped seat and a plastic hub that is integrally connected to the center of the seat. This is a disk cartridge with structural improvements made to the hub and hub.

[Background of the invention]

FIGS. 1 and 2 show typical examples of the differential cartridge to which the present invention is directed.

This is basically the drive shaft insertion window 3 and the magnetic head insertion window 4.
and a disk 2 rotatably housed in the disk case 1, and the disk 2 is integrally connected to a disk-shaped seat 9 and a medium heat section of the seat 9, and a drive shaft 477J person window 3 is provided. The hub 10 facing the hub 10 has a support shaft insertion hole 14 in the center thereof, and a retaining portion 16 is provided at one location on the outer periphery of one surface of the hub 11. A support shaft 19 and a drive shaft 20 are protruded from the disk drive side.
7 and collet 21 are installed vertically facing each other, and when the disk cartridge is loaded into the disk drive,
As shown in ``@6shi'', the upper and lower end surfaces of the hub 1o are attached to the hub cradle 17.
is clamped between the hub receiving surface 18 and the tip surface of the collet 21,
Form 1 in which the support shaft 19 engages in the support shaft insertion hole 14 and the drive shaft 20 abuts and engages with the engaging portion 16 to rotationally drive the disk 2
c.

In such a drive type (4), how to move the hub 1o relative to the support shaft 19 in order to prevent track slippage?
<The problem is whether or not to align the center.

In order to meet such demands, as shown in FIGS. 3 and 4, a circumscribed surface 32. 32, and a spring member 36 is disposed in a portion facing the circumscribed surface 32°32 to come into elastic contact with the circular outer circumferential surface of the support shaft 19,
The spring material 36 forcibly brings the circumscribed surface 32.32 into contact with the outer periphery of the support shaft 19 at two points, thereby aligning the center of the hub 1o with three-point contact support by the circumscribed surface 32.32 and the spring material 36. ing.

In this type of hub 10, firstly, the circumscribed surface 3
2.32 and the contact surface of the spring material 36 with the support shaft 19 require strict dimensional accuracy in microns! Therefore, materials with good dimensional stability are required. Second, spring wings 36
Since it is repeatedly elastically deformed and is always in elastic contact with the outer periphery of the support shaft 19 during use, it is required to have excellent creep resistance (spring properties). Therefore, conventionally, arylate resin, which has excellent dimensional stability and rigid creep properties, has been used for the hub 1°. The thermal expansion coefficient of the hub 10 made of arylate resin is significantly larger than that of the stainless steel used for the support shaft 19, so the usage limits of the disk cartridge and disk drive may vary depending on changes. , the hub 10 was eccentric to the center of the X14i119, causing the driver to get used to the track. This track deviation will be explained using FIGS. 6 and 7.

In Figure 6, the solid line is ! The engaged row of the bald part 10 and the support shaft 19 in the tactile IC is shown. Here the environmental temperature is 1
If the extension of the radius of the support shaft 19 when it rises to 2C is Δr, and the increase in the distance of the circumferential surface 32 of the hub 10 from the center 0 of the support shaft 19 is Δh, then Δb = α4 Hr (t2 tI
) Δr；α,・”(tx tt) Here, r is the radius of the spindle and αh is the temperature expansion coefficient of the Arylate hub, 60X10-
6/U, α, is the temperature expansion coefficient of stainless steel, 16
．． 4×10-'/C.

Since the usage environment of the disk drive is 5C to 515C, t2-tl = 51.5-5 = 46.5, therefore, Δh-5.58/jm, Δr = 1.53 p. FIG. 7 shows the state of engagement between the hub 10 and the support shaft 19 at an environmental temperature t2C.
is forcibly brought into contact with the outer periphery of the support shaft 19 at two points,
The center P of the hub 10 is eccentric by ΔX from the center O of the support shaft 19 by the amount of ΔX Fi, as shown on the seventh right (Δh−Δ[)
Since it is the hypotenuse of a right-angled isosceles triangle whose equilateral sides are
, 58-1,53n=5.73 (pgn) As calculated above, a track slippage of 5.73 μm occurs. In order to minimize this tracking error, it is necessary to make αh and αS as equal as possible. Since the support shaft 9 needs to be made of stainless steel due to its structure, if the circumferential surface 32 of the hub 10 is made of steel, αh and α can be made equal to so. On the other hand, the disc-shaped magnetic sheet 9 is configured to be clamped around the central hole by a hub 10. In this configuration, the magnetic sheet is a polyethylene terephthalate sheet coated with a magnetic material. Therefore, the temperature expansion coefficient is αa=17xio-'/
C, and the temperature expansion coefficient αh of the hub 10 is αh=(i 0
, x 10-'/'C, so if the flow rate changes in the usage environment is large, deformation such as waviness may occur due to the difference in the amount of elongation between the hub 10 and the magnetic sheet 9 at the sandwiched part. This may impair smooth contact with the magnetic head.

[Purpose of the invention]

An object of the present invention is to provide a disk cartridge that does not cause track slippage and does not cause harmful deformation even when the degree of mud changes in the usage environment.

[Summary of the invention]

The gist of the present invention is to form a contact surface 32, 32 on the circular surface of the support shaft 190 by bending a steel plate on the inner peripheral surface of the support shaft insertion hole, and to form a magnetic sheet 9 on the outer periphery of the steel plate. It is located at the point where the peripheral part of the central hole is v(k) or glued.

[Embodiments of the invention]

Next, the disk car 1 chassis of the present invention will be explained based on the drawings. In FIG. 1 and FIG. It consists of

A drive shaft insertion window 3 located approximately in the center near the front of the disk case 1t, a magnetic head insertion window 4 and a drive shaft insertion window 3 located in front of the magnifying glass drive shaft window 3 and long from front to back. The small-diameter index hole 5 located at the rear and the like are opened, and these windows are provided vertically through each other. The disc 2t is made up of a disc-shaped magnetic sheet 9 having a circular hole 8 in the center, and a knob 10 that clamps the periphery of the central hole 8 of the sheet 9.

In FIGS. 8 and 9, the hub 0 includes an upper knob structure 11 molded from arylate resin, a lower hub structure 12, and an intermediate hub structure 13 molded from steel plate.
It has a spindle insertion hole 14 in the center,
An annular guide groove 15 is provided on the outer end surface of the lower hub structure 12.
A rib 16 (hereinafter referred to as
This is referred to as an engaging portion 16).

5 and 9, on the disk drive side, a support shaft 19 is provided in the center on the hub receiving surface 18 of the hub pedestal 17, and a drive shaft 20 is provided protruding low at one circumference of the disk.
It is equipped with a cone-shaped collet 21 facing the hub holder 17, and when a disk cartridge is loaded into the taste stripe, the collet 1 and the hub holder 17 are inserted through the drive shaft insertion window 3 of the disk case l. The upper and lower end surfaces of the hub JO are clamped and held by the surface 18 and the tip surface of the collet 21, the multishaft 19 enters the support shaft insertion hole 14, and the drive shaft 20 engages in the kite groove 15. The rotation of the Hough holder 17 engages the guide groove 15/i JIJ:, the moving shaft 20 abuts on the engaging portion 16 (ff+
This will drive the bu 2 to rotate.

-Next, the 8 brothers of (1N) adults 11, 12 and 13 of the hub 10 will be explained. In Fig. 10, 1L111J, Fig. 13 and Fig. 14, the opposing surfaces of both 12 and 1.3 (
On the outer periphery 1 of the fil (J position 1 convex 1), circular J-shaped sheet swing surfaces 23 and 24 that abut each other are formed to protrude concentrically with the hub center P.Lower hub 10m/adult 12'' two surfaces 1t (-k, sheet clamping surface 23, inner surface J, tall welding pin 25 and short positioning pin 26 respectively in the hub) L?P and interior concentric interior (circumference) Four welding bottles are provided alternately protruding on the line, and through holes 27 and 28 are provided through which each welding bottle 25 fits into the upper hub body 11 and the intermediate hub body 13. A through hole 29 into which a positioning pin 26 fits is transparently provided in the structural body 13.The positioning pin 26 has an outer circumferential surface radially outside (t(-)) of the welding pin 25, It also serves as

To assemble the disk 2, place the sheet 9 on the upper surface of the lower hub structure 12, and position the sheet 9 by making the periphery of the hole 8 in the sheet circumscribe each positioning bin 26, as shown in FIG. i
preferably in the center hole of the sheet 9.
After applying adhesive to the sheet clamping surface 24 side of the 9 parts, the intermediate hub structure 13 is screwed onto the lower hub structure 12, and each welding layer bottle 25 is guided and fitted into each through hole 28. Further, the upper hub J roofing body 11 is fitted on top of the upper hub J roofing body 11 so that each of the first welding bins 25 is guided and fitted into each through hole 27, and the upper end of the general welding bin 25 is made to protrude from the upper end surface of the upper hub J roofing body 11. , the protruding upper end of each welding bottle 25 is melted by ultrasonic welding or the like, and the hub components 11, 12 and 13 are caulked together.

In FIGS. 10 and 11, the lower hub structure 12 has a hole 30 in the center, and a support is provided on a part of the inner circumference of the hole 30 at a position corresponding to the circumferential surface 32, 32 in FIG. The insertion guide portion 33.33 of the shaft 19 is formed with a constant angle θ (90° in the illustrated example).

A spring member 36 curved in an arc shape with the hub center P as the center of curvature is cantilevered out from one side of the punch hole 30, and a block-shaped exposed portion 36a is integrally molded at the free end of the spring member 36. This spring head 36a is located opposite the insertion slot 33.33. Further ahead of the head 36a, a spring pressure adjustment part 37 is integrally molded which comes into sexual contact with the rising part 39 in FIG. 13.

It In Figures 13 to 14, the intermediate hub structure 1
3#'i steel plate press-formed product with a punched hole 38 in the center, and two circumscribed surfaces 32. which are in line contact with the circular outer peripheral surface of the support shaft 19 from a part of the punched hole 38 at two points PL - Pz. 32 are vertically formed with a constant angle θ (90° in the illustration). An upright portion 39 is formed perpendicularly to the circular outer circumferential surface of the support shaft 19 at a position facing one of the circumscribed surfaces 32 so as to have a slight gap g.

After the hub 10 is configured as shown in FIGS. 8 and 9, the spring pressure adjusting portion 37 elastically contacts the upright portion 39 of the intermediate knob structure 13 and enters inside excessively, causing the support shaft 19 to
This is done so as not to obstruct the insertion of the

This disk cartridge is loaded into the disk drive, and the spindle 19 is inserted into the spindle insertion hole 14 of the hub IO through the guide portion 33.
．． 33 and insert it, first the spring material head 36a
The protruding inner end surface of the support shaft 19 elastically contacts the outer circumference of the support shaft 19 and retracts.
The elastic force of the spring material 36 urges the circumscribed surface 32.32 to come into contact with the circular outer peripheral surface of the support shaft 19, and the two are fixed by the movable external contact point P3 of the spring material head 36a and the circumscribed surface 32.32. External contact P
I.P! The hub 10 is elastically held in alignment with the support shaft 19 in a three-point contact state.

〔Effect of the invention〕

According to the invention, the magnetic sheet 9 is fixed to the clamping surface 24 of the intermediate knob body 13 made of steel, and the center alignment with the 5° support shaft 19 is made by the circumscribed surface 32, 32 made of steel. Because of this, the thermal expansion coefficients are largely the same, so tracking will not occur even when the temperature changes in the usage environment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a disk cartridge according to the present invention;
24! 21gl is a central vertical cross-sectional view thereof. Figures 3 to 5 show conventional configurations; Figures 6 to 213
FIG. 7 is a schematic plan view illustrating the spindle insertion hole. Fig. 8 shows the knob configuration of the present invention, and Fig. 9 shows its vertical NJr.
Figures 2 and 10 are cross-sectional views taken along line A--A in Figure 11 and Figure 11, respectively, illustrating the lower hub structure. FIG. 12 is a bottom view, FIG. 13 is an example of the intermediate hub component, and FIG. 14 is a sectional view taken along the line E-B. 1... Disc case, 2... Disc, 3...
Drive shaft insertion window, 9... Seat, lO... Hub, 12
...lower hub structure, 13...intermediate knob structure,
14... Support shaft insertion hole, 19... Support shaft, 32... Circumscribed surface, 33... Guide portion, jtrσ5 15 ″44 Fig. 2 Fig. 177 Fig. 25 '7 lz Fig. 2 Force

Claims (1)

[Claims] 1. Disc case (1) having a drive shaft insertion window (3)
A disc (2) is rotatably installed inside the disc (2).
2) is a disk-shaped seat (9) and a hub Qll that is integrally connected to the center of the seat (9) and faces the drive shaft insertion window (3).
In this disk cartridge which has a spindle insertion hole θa in the center of the hub a, there are two points (P+) on the circular outer circumferential surface of the spindle 0 on a part of the circumference of the spindle insertion hole α.・
The circumscribed surface (32) that contacts at (P2) is formed of a steel plate, and this circumscribed surface (32) has a spring material that contacts the circular outer circumferential surface of the support shaft C191 at one point (P3) in the y-opposed circumferential phase. The sheet (9) is sandwiched between the outer edge of a steel plate that is made of plastic and is integral with the circumscribed surface (32). 2. An insertion guide portion (33) for the support shaft 09 is provided on the plastic lower hub structure 021 at a position corresponding to the circumscribed surface (32) provided on the intermediate Huff root adult body 03, and the support shaft 09 is Tinuku cartridge according to claim 1, characterized in that the outer circumferential surface of the support shaft is protected when inserting the shaft QgJ. 3. Cantilevered on the plastic lower hub structure α2. The intermediate hub structure a is attached to a part of the spring material (36) provided in the
The spring pressure plate 4 is in elastic contact with the rising part (39) of 3
7) and the spring material (36) when the support shaft σ9 is inserted
This reduces the variation in the amount of deformation of the spindle Q! 3. The disk cartridge according to claim 1 or 2, wherein the variation in the magnitude of the insertion force is suppressed.