JPH056609Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a flexible disk cartridge that houses a disc-shaped magnetic disk sheet formed to be extremely thin with a small diameter, and performs recording and reproduction by rotating this magnetic disk sheet. In particular, the present invention relates to an improvement in the cleaning means for the magnetic disk sheet.

(Prior Art) Floppy disks have been proposed in which magnetic layers are formed on both sides of a disk-shaped base made of a flexible polyester sheet, etc., and magnetic recording is performed on the magnetic layers by a magnetic head while the disk is rotated. Due to its ease of handling and low cost, it is widely used as a recording medium for computers.

Meanwhile, the advantages of such floppy disks,
Also, so-called micro-floppy disks have been put into practical use, which take advantage of the unique advantage of magnetic recording that silver halide film does not have, that the recording medium can be reused, and which are further miniaturized and easier to use. These microfloppy disks are rotatably housed in a hardened case, and the case is attached to a driver, which is a reading and reproducing device, as a flexible disk cartridge.

This case is made up of an upper shell and a lower shell of approximately the same shape that are fitted together, and the inside of the case is in light contact with the recording surface of a microfloppy disk, that is, a magnetic disk sheet, and as the magnetic disk sheet rotates. A cleaning liner made of non-woven fabric such as rayon or polyester that cleans dirt, dust, etc. adhering to the surface of the magnetic disk is attached between the magnetic disk sheet and the inner surface of the case facing the sheet by ultrasonic welding or the like. It is pasted.

This liner is brought into contact with the sheet with uniform strength,
Since it is necessary to achieve a sufficient cleaning effect from the inner edge to the outer edge of the recording area of the sheet, measures have been taken to ensure uniform contact, such as providing a lifter, which is an elastic pressing means that applies pressure to the liner.

For example, FIG. 3 shows a cross section of a flexible disk cartridge in which the lifter is provided.

A lifter 3 is disposed between the inner surface of the lower shell 1 and the seat position 2, and the non-adhesive portion 3b extends from one end 3a and has a shape that stands obliquely above the end 3a. A portion 3a is fixed to the inner surface of the lower shell 1. One end 3a of this lifter 3
A protrusion 4 extending along the vertical direction of the lifter 3 projects from the inner surface of the lower shell 1 below the non-adhesive part 3b in the vicinity, and is supported by the protrusion 4 so that the non-adherent part 3b of the lifter 3 is lowered. The liner 5 is pushed up elastically. Further, a protrusion 6 is formed below the non-adhesive part 3b, protruding upward from the inner surface of the lower shell 1, being lower than the protrusion 4, and facing the non-adhering part 3b of the lifter 3 with a space in between. .

Due to the space between the protrusion 6 and the lifter 3, the lifter 3 has elasticity in the vertical direction using the protrusion 4 as a fulcrum, and the lower liner 5 can be brought into contact with the sheet 2 with an appropriate pressing force. can.

Also, at a position opposite to the protrusion 6 of the upper shell 7,
A protrusion 9 is formed to support the portion of the upper liner 8 attached to the upper shell 7 at the position above the inner surface of the upper shell 7, and the upper liner 8 is brought into contact with the upper surface of the sheet 2. .

(Problems to be Solved by the Invention) The lifter 3 is usually made of PET resin and has a very thin thickness of 75 to 125 μm.

For this reason, if the lifter 3 is used for a long time, as shown in FIG.
The lower liner 5 descends to a position where it contacts the protrusion 6, and the contact of the lower liner 5 with the sheet 2 becomes incomplete.

Once the lifter 3 becomes sagging in this way, the pressing force against the lower liner 5 is insufficient, and the lower liner 5
It becomes impossible to bring the material into contact with the sheet with sufficient strength, and the cleaning effect is significantly reduced.

In order to prevent such sagging of the lifter 3, the height of the protrusion 6 is increased, and the protrusion has a height that allows the sheet 2 to constantly contact the lower liner 5.
Although a method of bringing the lower liner 5 into contact with the sheet 2 can be considered, this is not preferable because the contact state between the lower liner 5 and the sheet 2 is too strong and the rotational torque of the sheet 2 increases.

Therefore, in view of the above-mentioned problems, the present invention aims to provide a flexible disk cartridge that prevents the deterioration of the cleaning effect of the liner due to the wear and tear that occurs as the lifter ages and allows the sheet to rotate in a good condition at all times. do.

(Means and effects for solving the problem) In order to solve the above problem, the flexible disk cartridge according to the present invention has a liner attached to the inner surface of the upper and lower shells, and this liner and the inner surface of the lower shell. In the flexible disk cartridge, a lifter having one end stuck to the inner surface is disposed between the lower shell and the lifter is supported by a protrusion provided near the one end. The lower liner is placed near the tip of the non-stick part of the lifter and at a position away from the protrusion formed in the upper shell on the tip side of the non-stick part, so that the upper surface of the liner is in contact with the sheet. It is characterized in that a protrusion is formed to support the support.

This separately provided projection supports the vicinity of the tip of the lifter upward, prevents the lifter from becoming sagging, and allows the lower liner to effectively contact the sheet for a long period of time.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an outline of a magnetic disk cartridge according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line -2.

A disk-shaped magnetic disk sheet 11 is supported at its center by a center core 12 and rotatably housed in a case consisting of an upper shell 13 and a lower shell 14. At positions facing each other in the upper shell 13 and lower shell 14, there is a head insertion opening 15 extending in the radial direction of the magnetic disk sheet 11, exposing a part of the sheet, and allowing the magnetic head to enter from the outside. It is provided. Also, on the case, slide the case surface in the direction of arrow S,
Shutter 1 for opening and closing the head insertion opening 15
6 is provided. The shutter 16 is in a position to close the head insertion opening 15 when the cartridge is not in use, and moves to a position in which the head insertion opening 15 is opened when the cartridge is in use, allowing the magnetic head to enter from outside. The magnetic head that has entered the case comes into contact with the sheet 11, and slides relative to the sheet rotating at high speed in the direction shown by arrow A in FIG. 1, thereby recording and reproducing various information.

an inner surface 13 facing the magnetic disk sheet 11 and the sheet 11 of the upper and lower shells 13 and 14;
A and 14a are provided with substantially circular upper and lower cleaning liners 17 and 18 that cover the magnetic disk sheet 11 and are made of a nonwoven fabric made of a blend of rayon, polyester, or the like. The liners 17 and 18 are fixed to the inner surfaces 13a and 14a, respectively, by heat sealing or the like. Although the shape of the liner is approximately circular in this embodiment, the liner may have any shape as long as it has a size extending from the inner edge to the outer edge of the recording area of the magnetic disk sheet 11.
Any size can be used. Further, between this liner 17 and the inner surface 14a of the lower shell 14, a lower liner 18 is elastically pushed up in the direction of the sheet 11, so that the liner 18 has a uniform strength from the outer edge to the inner edge of the recording area of the sheet 11. A lifter 19 is provided which is brought into contact with.

This lifter 19 is usually made of PET resin with a thickness of 75 mm.
It is formed into a substantially flat plate shape with a thickness in the range of ~150 μm, and one end portion 19a is adhered to the inner surface 14a.
A protrusion 20 is formed on the lower inner surface 14a of the lifter 19 near the one end 19a where no adhesive is attached. This protrusion 20 is formed to extend along the vertical direction of the lifter 19,
A lifter 19 is supported on the lower liner 18 at a height where the upper surface of the liner contacts the sear 11.

Furthermore, a protrusion 21 having the same shape is formed on the inner surface 14a near the tip of the non-stick portion 19b of the lifter 19, and the tip of the lifter 19 is supported in a shape that brings the lower liner 18 into contact with the sheet 11. There is.

The lifter 19 is always held at a constant height by these protrusions 20 and 21, and the liner 18 is attached to the seat 11.
Pressure can be applied so that they can be brought into uniform contact.
That is, supported by the protrusion 20, the lower liner 18
The tip of the non-adhesive portion 19b of the lifter 19, which applies upward elastic pressure to the lifter 19, is always supported at a predetermined height by the protrusion 21, so even if used for a long period of time, it will not deteriorate and fall. This lifter 1
The lower liner 18 located on the non-stick portion 19b of the sheet 9 is pressed and supported at a contact position with the sheet 11.

Further, since the lifter 19 is in a shape suspended between the protrusions 20 and 21, the lifter 19 can bend downward while applying upward pressure to the lower liner 18. Therefore, the lifter 19 can have appropriate elasticity in the vertical direction and can bring the lower liner 18 into contact with the sheet 11.

Further, in a portion of the upper shell 13 facing the non-adhesive portion 19b of the lifter 19, there is a protrusion that supports the portion of the upper liner 17 adhered to the upper shell 13 at this position by floating it above the inner surface of the upper shell 13. 23 is made to protrude.

Therefore, the upper liner 17 is always brought into contact with the sheet 11 with a constant pressing force to perform cleaning, and the lower liner 18 is brought into contact with the sheet 11 with a certain degree of elasticity as described above. The lower liner 18 can also be moved up and down depending on its elasticity.

Since this embodiment uses a so-called 3.5-inch type flexible disk cartridge as an example, the height of the protrusions 20 and 21 is 0.2 m/m to 0.5 m/m.
m/m and a width of about 0.5 m/m to 1 m/m.
It is appropriate that this protrusion 21 is provided at a position 2 m/m to 5 m/m away from the outer edge of the lifter 19 non-adhesive part side 19b of the protrusion 23 of the upper shell 13 toward the tip side of the lifter non-adhesive part 19b. , the protrusion 20 is also provided at a symmetrical position from the opposite outer edge of the protrusion 23. Protrusion 2
It is appropriate that both the protrusions 21 and 21 have a width of about 3 m/m outside the protrusion 23, and it is preferable that the protrusion 23 has a width of about 10 m/m so as not to increase the rotational torque of the seat 11.

(Effects of the invention) As described above, in the present invention, since the lifter is supported by the protrusion at a position where the liner is always brought into contact with the sheet, it is possible to prevent the lifter from becoming sagging over time. Therefore, cleaning can be effectively performed by applying elastic pressure to the liner and bringing it into contact with the sheet over a long period of time, improving the accuracy of reading and reproduction.

Furthermore, since the lifter is held in a suspended state between two protrusions, the liner on the lifter has downward elasticity in contact with the sheet;
Since the liner is brought into contact with the sheet with an appropriate pressing force, the sheet can be rotated in good condition.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the flexible disk cartridge according to the present invention, FIG. 2 is a cross-sectional view of the main part of FIG. 1 taken along the - line, and FIG. The sectional view shown in FIG. 4 is a sectional view showing the drawbacks of the conventional example. 1, 14... Lower shell, 2, 11... Magnetic disk sheet, 3, 19... Lifter, 3a, 19a
...One end, 3b, 19b...Non-adhesive part, 4,2
0... Protrusion, 5, 18... Lower liner, 7, 13...
...Upper shell, 8,17...Upper liner, 9,23...
...Protrusion, 21...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A cleaning liner having approximately the same shape as the sheet is adhered to the inner surface of a case consisting of an upper shell and a lower shell that accommodate a disk-shaped magnetic disk sheet, and the inner surface of the lower shell A lifter is disposed on the lower shell, one end of which is affixed to the inner surface of the lower shell so as to push up the lower liner affixed to the lower shell and bring it into contact with the sheet; A protrusion supporting the lifter is formed on the inner surface of the lower lower shell near the one end of the upper shell, and a protrusion that supports the lifter is formed on the inner surface of the upper shell at a position opposite to the non-stick portion of the lifter. A flexible disk cartridge is formed with a protrusion that supports a portion of the attached upper liner at the position by floating it above the inner surface of the upper shell, wherein the portion of the inner surface of the lower shell to which the lifter is not attached A protrusion that supports the lower liner at a height such that the upper surface of the liner contacts the sheet is provided near the tip of the upper shell and at a position away from the protrusion formed on the upper shell on the tip side of the non-stick portion. A flexible disk cartridge characterized by being formed.