JPH0337197Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is most suitable for application to disk cartridges that use floppy disks made of magnetic sheets, etc. A disk is rotatably housed in a cartridge, a liner sheet is interposed between at least one surface of the disk and one half opposite to the one surface, and a part of the liner sheet is used for recording the disk. A lifter made of an elastic sheet material interposed between a liner sheet and one half so as to elastically press against one surface of the disk over substantially the entire width in the radial direction of the surface. This invention relates to a disk cartridge provided with a plate.

[Prior art]

The conventional example shown in Figures 3 to 5 has a diameter of 3.5 mm.
This figure shows a floppy disk cartridge using a micro floppy disk made of an inch-sized magnetic sheet, etc., and a floppy disk (hereinafter referred to as (simply written as disk) 4 is rotatably stored, and the upper and lower halves 1,
A pair of upper and lower liner sheets 5 and 6 are provided between the inner surface of the disk 2 and the disk 4. A center core 7 made of a metal disk is fixed to the center of the disk 4, and the center core 7 is provided with a center hole and an eccentric hole 9. Further, the upper and lower halves 1 and 2 and both liner sheets 5 and 6 are provided with long holes 10 and 11 for inserting the head and notches 12 and 13, which are opened and closed by a shutter 14. It is configured. Furthermore, a circular hole 15 for inserting a turntable is provided in the center of the lower half 2, and both liner sheets 5,
Circular holes 16 and 17 facing the circular hole 5 are also provided in the center of the hole 6 .

Both liner sheets 5 and 6 are made of a so-called non-woven fabric made of long fibers such as polyester, polyethylene, rayon, etc., formed into a sheet by a method such as heat compression bonding. The liner sheets 5 and 6 are respectively secured to the inner surfaces of the upper and lower halves 1 and 2 by adhesive or the like as appropriate, and these liner sheets 5 and 6 are configured to be in constant contact with the upper and lower recording surfaces of the disk 4. Furthermore, in order to increase the contact pressure between the liner sheets 5 and 6 with respect to the disk 4, a lifter plate 18 made of an elastic sheet material such as a synthetic resin sheet is fixed to the inner surface of the lower half 2 by adhesive or the like. As shown in FIGS. 4 and 5, at the tip end 18a of the lifter plate 18, a part of the lower liner sheet 6 is lifted over substantially the entire width R of the recording surface of the disk 4 in the radial direction. The lower surface is elastically pressed from below. As shown in FIGS. 4 and 5, the fixed end 18 of the lifter plate 18 is provided on the inner surface of the lower half 2.
a rib 19 substantially parallel to the radial direction of the disk 4 provided to tilt the tip side upward from b;
Two ribs 20 are provided substantially parallel to the rotational direction of the disk 4 to prevent the tip end portion 18a of the lifter plate 18 from being bent downward beyond a certain level. Further, a large number of ribs 21 are provided on the inner surface of the upper half 1 at positions substantially opposite to the tip portion 18a of the lifter plate 18, which are substantially parallel to the rotational direction of the disk 4.

When this floppy disk cartridge is used, the center pin and drive pin on the turntable of the disk player are engaged with the center hole 8 and eccentric hole 9 of the center core 7, and the disk 5 is rotated by the drive pin. Driven, both long holes 1
The upper and lower recording surfaces are selectively recorded or reproduced by a pair of upper and lower recording/reproducing heads that are brought into contact with the upper and lower recording surfaces of the disk 5 through the notches 12 and 13.

During this use, the upper and lower recording surfaces of the disk 4 are constantly in contact with both liner sheets 5 and 6 and are driven to rotate, as shown in FIGS. 4 and 5.
The center of the disk 4 is positioned at the center of the turntable using the load torque caused by the frictional force. Also, when the disk 4 rotates, the liner sheets 5 and 6 perform cleaning to wipe away dust adhering to the upper and lower recording surfaces of the disk 4 and abrasion powder generated by contact between the disk 4 and the recording/playback head. .

[Problem that the invention attempts to solve]

However, this conventional example had a defect in that the cleaning effect was particularly lost due to changes over time and dropouts were likely to occur.

That is, the upper and lower halves 1 are molded from synthetic resin,
The wall thickness of the upper and lower halves 1 and 2 is very thin, and the rigidity of these upper and lower halves 1 and 2 is low. Moreover, upper and lower half 1,
2 is simply a structure in which the four corners of the outer peripheral edges 1a and 2a that are butted against each other from above and below are simply fixed by ultrasonic welding, etc., and the central portions of these upper and lower halves 1 and 2 are not fixed in any way from above and below. . Therefore, these upper and lower halves 1 and 2 are particularly susceptible to deformation such that the central portion swells outward as shown by arrows A and B in FIG. 5 due to changes over time (as well as molding distortion and external force). In particular, since the central portion of the lower half 2 is very weak due to the circular hole 15 provided therein, the central portion of the lower half 2 tends to bulge outward (in the direction of arrow B).

When such deformation occurs in the upper and lower halves 1 and 2, the vertical distance between the upper and lower halves 1 and 2 becomes wider on the inner peripheral side 4b of the disk 4 than on the outer peripheral side 4a, so that the tip portion 18a of the lifter plate 18 The pressing force of the lower liner sheet against the disk 4 is significantly weaker on the inner circumferential side 4b of the disk 4 than on the outer circumferential side 4a. As a result, in the conventional example, the contact pressure of both liner sheets 5 and 6 against the disk 4 is significantly lower on the inner circumferential side 4b than on the outer circumferential side 4a of the disk 4.
The cleaning effect of the disc 4 was significantly lost, and a defect was generated on the inner peripheral side 4b of the disc 4, which was likely to cause dropouts. Furthermore, if the contact pressure between the liner sheets 5 and 6 against the disc 4 decreases significantly, it becomes impossible to obtain sufficient frictional force necessary to position the disc 4 at the center of the turntable. Defects such as tracking errors and unstable disk rotation also occur.

This invention makes it possible to always uniformly clean the entire inner and outer periphery of the recording surface of the disk, even if deformation occurs such as swelling on the outside of the central part of the upper and lower halves due to changes over time, etc. This ensures that sufficient frictional force necessary for centering can be obtained.

[Means for solving problems]

The present invention includes a lifter plate having a width substantially equal to the entire width in the radial direction of the recording surface of the disk, a tip portion that presses the liner sheet, a fixed end portion that is fixed to the inner surface of one half, and A connection portion that is narrower in width than the tip portion and the fixed end portion and connects the tip portion and the fixed end portion at a position shifted toward the inner circumference of the disk from the widthwise center of the tip portion. It was constructed as follows.

[Effect]

In the present invention, the connecting portion that connects the tip end of the lifter plate and the fixed end portion is shifted from the widthwise center of the tip portion toward the inner circumferential side of the disk, so that the liner sheet is pushed by the tip portion of the lifter plate. Since the pressure can be made stronger on the inner circumference side of the disk than on the outer circumference side, even if the center part of the upper and lower halves swells outward due to changes over time, the liner sheet can be used to record the disk. It is possible to press the surface uniformly and in a well-balanced manner over substantially the entire width in the radial direction of the surface. Therefore, the entire inner and outer peripheries of the recording surface of the disk can be cleaned uniformly at all times. Further, it is possible to suppress a decrease in the contact pressure of the liner sheet against the disk as much as possible, and it is possible to reliably obtain sufficient frictional force necessary to position the disk at the center of the turntable.

〔Example〕

An embodiment in which the present invention is applied to a floppy disk cartridge using a micro floppy disk will be described below with reference to FIGS. 1 and 2. Note that the same reference numerals are given to the same structural parts as in the conventional example shown in FIGS. 3 to 5, and the explanation thereof is omitted.

First, as shown in FIG. 1, the lifter plate 24 of the present invention is molded from a thin metal plate such as a thin stainless steel plate that undergoes extremely little change over time. The lifter plate 24 is composed of a tip end portion 24a, a fixed end portion 24b, and a connecting portion 24c connecting these.
4b is fixed to the inner surface of the lower half 2 by adhesive or the like. Also, like the conventional example, the tip portion 24a
As shown in FIG. 2, a part of the lower liner sheet 6 is elastically pressed from below against the lower surface of the disk 4 over substantially the entire width R of the recording surface of the disk 4 in the radial direction.

By the way, in the lifter plate 24 of the present invention, as shown in FIG. 1
The center P1 of the direction is set in the direction of arrow C, which is the inner peripheral side 4b of the disk 4, than the center P2 of the widths 2 and 3 of the tip portion 24a and the fixed end portion 24b (which is also the center of the entire lifter plate 24 in the width direction). distance 4
It's only biased.

As a result of the above, in the lifter plate 24 of the present invention, the pressing force of the lower liner sheet 6 by the tip portion 24a is stronger at the inner peripheral end 24'' relative to the outer peripheral end 24a' against the disk 4. , the lower liner sheet 6 is pressed against the disk 4 more strongly on the inner circumferential side 4b than on the outer circumferential side 4a of the disk 4.

Therefore, as shown in FIG.
Even if deformation such as swelling occurs in the direction B) and the vertical distance between the upper and lower halves 1 and 2 becomes wider on the inner circumferential side 4b of the disk 4 than on the outer circumferential side 4a, the lifter plate 2
The outer peripheral end side 24 at the tip portion 24a of 4
Due to the difference in the pressing force between a' and the inner circumferential end 24a'', the tip portion 24a uniformly presses the lower liner sheet 6 over almost the entire width R in the radial direction of the recording surface of the disk 4 in a well-balanced manner. As a result, both liner sheets 5 and 6 uniformly clean the entire inner and outer peripheries of the upper and lower recording surfaces of the disk 4.

The embodiments of the present invention have been described above, but in particular,
The shape and material of the lifter plate 24 of the present invention are not limited to those shown in the embodiments, and various changes can be made.

Furthermore, in the embodiment, a pair of liner sheets 5 and 6 are arranged above and below the disk 4 having recording surfaces on the upper and lower sides, but if a disk with a recording surface formed on only one side is used, for example, one of the liner sheets A liner sheet may be arranged only on the side of the disk, and the liner sheet may be pressed against one side of the disk by a lifter plate.

Furthermore, the present invention is not limited to floppy disk cartridges using floppy disks made of magnetic sheets or the like, but can be applied to disk cartridges of various recording and reproducing methods using disks made of various materials.

[Effect of idea]

With this invention, even if the center portions of the upper and lower halves bulge outward due to changes over time, the entire inner and outer peripheries of the recording surface of the disk can be cleaned uniformly at all times, unlike conventional methods. As a result of the cleaning effect being lost on the inner circumferential side of the disk, defects such as dropouts on the inner circumferential side of the disk do not occur at all, and the cleaning effect can be dramatically improved. In addition, since it is possible to minimize the drop in the contact pressure of the liner sheet against the disc, it is possible to reliably obtain sufficient frictional force necessary to position the disc at the center of the turntable, resulting in high reliability. can get.

[Brief explanation of the drawing]

1 and 2 show an embodiment in which the present invention is applied to a floppy disk cartridge using a micro floppy disk.
FIG. 1 is a perspective view showing a lifter plate portion, and FIG. 2 is a central sectional view of the entire cartridge. 3 to 5 show a conventional example of a floppy disk cartridge using a micro floppy disk, and FIG. 3 is an exploded perspective view of the whole;
FIG. 4 is a cross-sectional view of the main part of the cartridge taken along the rotational direction of the disk, and FIG. 5 is a central cross-sectional view of the entire cartridge. In addition, in the symbols used in the drawings, 1... upper half, 2... lower half, 3... cartridge, 4... floppy disk, 4a... outer peripheral side of floppy disk,
4b... Inner peripheral side of floppy disk, 5... Liner sheet, 6... Liner sheet, 24... Lifter plate, 24a... Tip portion of lifter plate, 24
a'...Outer peripheral end side of the lifter plate, 24a''...Inner peripheral end side of the lifter plate, 24b...Fixed end portion of the lifter plate, 24c...Connection part of the lifter plate, P1...
...The center of the connection part, P2...The center of the tip part.

Claims (1)

[Scope of Claim for Utility Model Registration] A disk is rotatably housed in a cartridge consisting of upper and lower halves, and a liner sheet is interposed between at least one surface of the disk and one half opposite to that one surface. and interposed between the liner sheet and one half so that a part of the liner sheet is elastically pressed against one surface of the disk over substantially the entire width of the recording surface of the disk in the radial direction. In a disk cartridge comprising a lifter plate made of a sheet material having elasticity, the lifter plate has a width substantially equal to the entire width in the radial direction of the recording surface of the disk, and has a tip that presses the liner sheet. a fixed end portion fixed to the inner surface of the one half, the width of which is narrower than the tip portion and the fixed end portion, and which is offset from the widthwise center of the tip portion toward the inner circumferential side of the disk; A disk cartridge comprising: a connecting portion connecting the tip portion and the fixed end portion at a position; and a connecting portion connecting the tip portion and the fixed end portion at a position.