JPS6141177Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a disk cartridge represented by a floppy disk, and has an improved shutter function that closes the magnetic head insertion window provided in the disk case when not in use and opens it when in use. It is.

Recently, a type of hard disk case has appeared in which a drive shaft insertion window, a magnetic head insertion window, an index hole, etc. are transparently provided, and a magnetic disk is rotatably mounted inside this disk case. In order to prevent dust from entering the interior through the magnetic head insertion window, which has a particularly large opening area, the shutter member that closes the magnetic head insertion window is pivoted inside the disk case so that it can be rotated to open and close when not in use. Sometimes, the opening surface of the magnetic head insertion window is closed tightly with the shutter member, and when in use, the shutter member is moved manually or in conjunction with the insertion operation into the magnetic recording device to open the magnetic head insertion window. is proposed.

However, since the magnetic head insertion window is generally formed in the shape of a long hole, if the shutter member is set so that it rotates from the position where it seals the magnetic head insertion window to the position where it completely opens, the rotation of the shutter member The movement angle becomes extremely large, and there is no longer enough space in the design for the placement of shutter components.
In addition, the movement stroke of the operating member for opening and closing the shutter member becomes large, which creates problems in terms of design when attempting to downsize this type of disk cartridge, leading to problems such as uncertain operation.

This invention was proposed primarily to reduce the rotation angle of the shutter member, paying attention to this fact.

Below, specific examples will be explained based on the drawings.
The proposed disk cartridge (floppy disk) is made of plastic upper and lower cases 1a and 1b.
A flat rectangular hard case type disk case 1 formed by fitting the lids together and integrally bonding them at several points indicated by P by ultrasonic welding, and a magnetic disk 2 rotatably installed inside the disk case 1. Consisting of

The disk case 1 has a drive shaft insertion window 3 located near the center near the front, a magnetic head insertion window 4 located in front of the drive shaft insertion window 3 and long from front to back, and a magnetic head insertion window 4 located at the rear of the drive shaft insertion window 3. a small-diameter index hole 5, positioning holes 6, 6 located on the front left and right sides with different diameters on the left and right, and a write protection hole 8, located on the front left and right sides that can be opened and closed by members 7, 7 mounted inside the case. 8, and these windows and holes are provided vertically through each other.

The magnetic disk 2 includes a disk-shaped magnetic sheet 11 having a through hole 10 near the hole 9 provided in the center and corresponding to the index hole 5, and a hub 12 that clamps the peripheral edge of the central hole 9 of the magnetic sheet 11. Consisting of
This hub 12 consists of upper and lower hub members 13 and 14, and the peripheral portion of the central hole 9 of the magnetic sheet 11 is sandwiched between these hub members 13 and 14, and the hub members 13 and 14 are welded together by ultrasonic welding. It has become a unified whole.

Upper and lower cases 1a constituting the disk case 1,
On each inner surface of the magnetic disk 1b, annular walls 15, 15 concentric with the outer periphery of the drive shaft insertion window 3 are vertically spaced apart and project from each other, and the hub 12 of the magnetic disk 2 is The annular walls 15, 15 are located above the drive shaft insertion window 3 in the disk case 1.
Free movement in the radial direction is restricted by contact with the inner surface of the In the illustrated example, an insertion hole 16 is formed at the center of the hub 12, and an insertion hole 17 is formed at one location on the outer periphery so as to pass through the upper and lower sides. The fork-shaped drive shaft fits into the insertion hole 16 and the engagement hole 17 of the hub 12 to rotationally drive the disk 2.

Guide grooves 20, 20 extending from the front end to the vicinity of the rear end are formed in the outer surfaces 18, 18 of the left and right side walls 19, 19 of the disk case 1, respectively.
The guide grooves 20, 20 are used to insert the disk drive into a magnetic recording device.

It is also necessary to prevent dust from entering the inside of the disk case 1 through the index hole 5 and especially the magnetic head insertion window 4 when the disk cartridge is not in use. Therefore, a pair of upper and lower shutter members 21, 21 for opening and closing the magnetic head insertion window 4 and the index hole 5 are assembled inside the disk case 1. Each shutter member 21 is made of, for example, a synthetic resin or a metal plate as in this embodiment, and includes a base end portion 23 having a fitting hole 22, and a flat plate portion 24 extending forward from the base end portion 23. and a notch 25 formed in the base end 23 corresponding to the index hole 5,
The proximal end portion 23 is fitted onto the outer periphery of each of the annular walls 15 in a manner that prevents it from coming off, and is supported by the upper and lower cases 1a, 1.
It is fitted into a recess 26 formed on the inner surface of b and rotates around each annular wall 15 within a certain range. After the base end portion 23 of the shutter member 21 is fitted into each annular wall 15, the protrusion 27 provided on the protruding end surface of the annular wall 15 is heated and crushed to prevent it from coming off.
The extending end of the flat plate portion 24 of each shutter member 21 is connected to the tip of the slide operating member 29. This operation member 29 is a plastic molded product that is shaped like a strip having a constant width on the top and bottom and can be freely bent and deformed.
It is fitted into slide grooves 30, 30 provided on the inner surface of b. The slide groove 30 includes a straight portion 30a formed along the left side wall 19 of the disk case 1 and a series of curved portions 3 formed around the front side of the case.
0b, and a knob 31 protruding from the rear end side of the operating member 29 extends into the guide groove 20 through a notch 32 having a constant length in the front and back provided in the front and rear intermediate portions of the left side wall 19 of the case. There is. The operating member 29 is urged to slide forward by a spring member 33 that is attached across the inner surface of the lower case 1b and the rear end of the operating member 29.

In this case, when the disk cartridge is not in use, that is, in a normal state, the operating member 29 is urged to slide forward by the spring member 33, and each shutter member 21 connected to this operating member 29 is urged to rotate in the closing direction. The flat plate portion 24 of each shutter member 21
closes the upper and lower openings of the magnetic head insertion window 4, and the notch 25 closes the upper and lower openings of the index hole 5 at the base end 23 located outside the index hole 5. When a disk cartridge is loaded into a magnetic recording device, a member (not shown) on the magnetic recording device side that engages with the guide groove 20 comes into contact with the knob 31, causing the operating member 29 to move against the spring member 33 and close the case. As the shutter member 21 slides rearward, the shutter member 21 rotates in the opening direction, and the magnetic head insertion window 4 and the index hole 5 are opened.

Here, the rotation limit of each shutter member 21 in the closing direction is as shown in FIG. As shown in FIG. 4, the rotation limit of each shutter member 21 in the opening direction is restricted by
The left end edge of the flat plate portion 24 is regulated by coming into contact with the opposite end edge of the recessed portion 26. However,
The limit of rotation of each shutter member 21 in the closing direction is regulated by the tip of the operating member 29 coming into contact with the stopper wall 35 inside the disk case, and the limit of rotation of each shutter member 21 in the opening direction is regulated by the operating member 29. The rear end of the slide groove 30 may be brought into contact with the rear end surface of the linear portion 30a of the slide groove 30 to regulate the movement.

The rotation angle of this shutter member 21 is smaller than that of the conventional one. That is, the rear end of the operating member 29 is extended longer than the conventional one, and is set to contact the rear end surface of the slide groove 30 quickly.

Thus, the flat plate portion 24 of each shutter member 21
A notch 36 is provided on the base end side of the right edge in the figure,
Even if this notch 36 exists, the shutter member 21
When the shutter member 21 is at its closing limit, the flat plate portion 24 completely closes the opening surface of the magnetic head insertion window 4 as shown in FIG. 3, and when the shutter member 21 is at its opening limit, the notch is closed as shown in FIG. With the interposition of the section 36, the flat plate section 24 completely opens the magnetic head insertion window 4. In other words, when the shutter member 21 is at its opening limit, a part of the flat plate part 24 is set to wrap around the magnetic head insertion window 4, and this lap part is cut out so that the notch edge of the notch part 36 is inserted into the magnetic head insertion window. It is arranged so as to roughly follow the opening edge of No. 4.

According to the present invention as described above, the presence of the notch 36 provided in the shutter member 21 makes it possible to completely open the opening surface of the magnetic head insertion window 4 even if the opening limit of the shutter member 21 is set quickly. Can be done. Therefore, even if the rotation angle of the shutter member 21 is reduced, there is no problem at all, and design leeway can be provided for the assembly of the shutter member 21 and its opening/closing operation member 29.
This is advantageous in reducing the size of the disk cartridge since reliable operation can be ensured.

[Brief explanation of the drawing]

The drawings illustrate the disk cartridge according to the present invention, and FIG. 1 is an external perspective view, FIG. 2 is an exploded perspective view, and FIG. 3 is a partial view of the magnetic head insertion window with the shutter member closed. FIG. 4 is a partially cutaway plan view with the magnetic head insertion window opened by a shutter member, FIG. 5 is a front view in longitudinal section at the center, and FIG. 6 is a side view in longitudinal section at the center. 1...Disk case, 2...Disk, 3...
...Drive shaft insertion window, 4...Magnetic head insertion window, 5...
... Index hole, 15 ... Annular wall, 18 ... Left and right outer surfaces of the disk case, 19 ... Left and right side walls of the disk case, 20 ... Guide groove, 21 ...
... Shutter member, 22 ... Fitting hole, 23 ... Base end of shutter member, 24 ... Flat plate part of shutter member, 29 ... Operation member, 30 ... Slide groove, 31 ... Knob, 33 ... Spring member, 35...
Stopper wall, 36... cutout.

Claims (1)

[Claims for Utility Model Registration] (1) A disk 2 is rotatably installed inside a disk case 1 having a drive shaft insertion window 3 and a magnetic head insertion window 4, and a magnetic head insertion window is installed inside the disk case 1. A knob 31 of an operating member 29 for opening and closing the shutter member 21 is rotatably supported between a position for closing the insertion window 4 and a position for opening the insertion window 4.
In the disk cartridge which is arranged so as to be seen from the outside of the disk case 1, the rotation angle of the shutter member 21 is determined by the rotation angle of the shutter member 21.
A disk cartridge characterized in that a portion of the shutter member 21 is set to disklap on the magnetic head insertion window 4 when the magnetic head is at its opening limit, and the lap portion of the shutter member 21 is cut out. (2) A utility model registration in which the drive shaft insertion window 3 is located approximately at the center of the disk case 1, and the magnetic head insertion window 4 is located in front of the drive shaft insertion window 3 and is elongated from front to back. A disk cartridge according to claim 1. (3) Utility model registration claim 2 in which the shutter member 21 rotates around the center of the drive shaft insertion window 3
Disk cartridge as described in section.