JPH11283353A - Magnetic disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the operation preventing a shutter member from coming off due to the impact when a cartridge is dropped, or the like. SOLUTION: In this disk cartridge, an opening 21 for inserting a magnetic head, the shutter member 3 for opening/closing this opening 21 and an elastic member 7 are provided on a case wherein magnetic disk media 6 are housed, then plural guide pawl parts 34, 35 projected inside are provided on the shutter member 3, and guide grooves 22, 23 with the recessed groove structure wherein the guide pawl parts 34, 35 are slid, are provided on the case 2. As to this constitution, the projected height of the guide pawl part 35 at the side of the elastic member 7 among the guide pawl parts 34, 35 is arranged to be larger than the projected height of another guide pawl part 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk cartridge in which a magnetic disk medium is accommodated in a case, and the magnetic disk medium is rotated to be used for magnetic recording and reproduction. The present invention relates to a guide structure for the shutter member.

[0002]

2. Description of the Related Art Conventionally, magnetic layers are formed on both sides of a disk-shaped base made of a flexible polyester sheet or the like, and magnetic recording is performed on the magnetic layers by a magnetic head while being driven to rotate (a so-called magnetic disk). A magnetic disk cartridge containing a floppy disk in a flat case is provided, and is mainly used as a recording medium for a computer because of its advantages such as easy handling and low cost.

In the magnetic disk cartridge, an opening for inserting a magnetic head and a shutter member for opening and closing the opening are provided in a case, and the shutter member is urged by an elastic member in a direction to close the opening for inserting the magnetic head. ing.

On the other hand, a plurality of guide claws are provided on the face plate of the shutter member so as to protrude inward, and a guide groove into which the guide claw of the shutter member is inserted is provided in the vicinity of the front end of the case in the cartridge insertion direction. It is provided so as to extend in a direction substantially orthogonal to. The guide claw moves along the guide groove to perform the opening / closing operation and the opening / closing position of the shutter member, and holds the shutter member so as not to come off the case by the engagement of the guide claw and the guide groove. ing.

[0005]

However, if the engagement between the guide claw protruding from the inner surface of the shutter member and the guide groove of the case as described above does not sufficiently prevent the shutter member from being disengaged, the shutter member may fail to fall. If the case receives a shock, etc.
In some cases, the shutter member may come off the case, or some of the guide claws may come off the guide grooves and ride on the case surface to cause a tilting operation failure.

That is, the case of the magnetic disk cartridge is formed to be thin, and it is difficult to secure the depth of the concave groove-shaped guide groove, and accordingly, the protrusion height of the guide claw portion of the shutter member cannot be sufficiently obtained. For this reason, when the magnetic disk cartridge is dropped, the shutter member is detached or one of the guide claws is detached and sometimes inclined in a falling state in which the corners collide.

[0007] This phenomenon is caused by the fact that when a corner portion provided with an elastic member for urging the shutter member comes into contact with the falling member, the elastic member is bent and the shutter member moves in the opening direction, and the shutter member is moved. It has been found that the shutter member does not move from the closed position and hardly comes off even if other corners fall and come into contact with it, as a result of receiving the impact force in the direction of going forward.

In order to prevent the above-mentioned detachment of the shutter member, it is effective to increase the protruding height or width of the guide pawl. However, the protruding height or width of the plurality of guide pawls is effective. In order to increase the depth of the guide groove, the depth or length of the corresponding guide groove must be increased. It is difficult from such points.

For example, when the guide groove is deepened, the thickness of the guide groove bottom portion of the originally thin case becomes small, so that it is difficult to form the guide groove. In addition, the guide groove extending in the width direction of the case extends over the entire length of the case. If it is provided so as to penetrate the inside of the case and is deep, there occurs a problem that the case strength is partially extremely reduced. In addition, it has been found that with respect to the drop impact on the corner near the elastic member as described above, if the function of preventing the coming off of the guide claw near the corner is enhanced, the coming off can be prevented at the time of the effect.

The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic disk cartridge having an enhanced action of preventing a shutter member from coming off within a range where strength is not impaired.

[0011]

According to a magnetic disk cartridge of the present invention which solves the above-mentioned problems, a disk-shaped magnetic disk medium is rotatably housed in a case, and a magnetic head insertion opening is provided in the case. A shutter member for opening and closing the magnetic head insertion opening, and an elastic member for urging the shutter member in a closing direction are provided, and a plurality of guide claws are provided on the face plate of the shutter member so as to project inward. A guide groove having a groove structure extending in a direction substantially perpendicular to the cartridge insertion direction, wherein the guide claw portion is inserted near the front end of the case to guide the opening and closing movement of the shutter member; Of the above, the protrusion height of the guide claw portion provided on the elastic member side is provided to be greater than the protrusion height of the other guide claw portions.

In the guide groove with which the guide claw of the shutter member is engaged, at least the depth of the guide groove in a range where the guide claw having a large protruding height slides is deeper than the depth of the other guide grooves. For example, it is formed in a through-hole shape penetrating to the inner surface of the case.

In another magnetic disk cartridge according to the present invention, the width of at least the guide claw provided on the elastic member side of the guide claw in the moving direction is larger than the width of the other guide claw in the movement direction. It is characterized by having been provided.

[0014]

According to the present invention as described above, the protrusion height or the width in the moving direction of the guide claw provided on the elastic member side of the guide claw is changed to the protrusion height or the other guide claw of the other guide claw. Even if the shutter member moves in the opening direction due to a drop impact in which the corner portion of the elastic member abuts, the guide on the elastic member side which receives the force in the most disengaged direction by being provided larger than the width in the moving direction. By increasing the action of preventing the claw portion from coming off, it is possible to effectively prevent the shutter member from coming off.

Further, even if the guide groove in the moving range of the guide claw portion on the elastic member side is formed deep as a penetrating structure, the strength is partially reduced, and the case is strengthened by securing the strength in the other guide grooves. Shortage is not effective and reliability can be ensured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a bottom view of an example of a large-capacity magnetic disk cartridge with a shutter member removed.

The magnetic disk cartridge 1 is held in a case 2 (hard case) made of a synthetic resin such as an acrylonitrile-butadiene-styrene copolymer with a central portion attached to a center core member 5. A disk-shaped magnetic disk medium 6 is rotatably accommodated. The center core member 5 is magnetically engaged with a rotating spindle of a drive device (not shown) to transmit a rotating force to the magnetic disk medium 6. The magnetic disk medium 6 has a disk-shaped base made of a flexible polyester sheet or the like and a magnetic layer formed on both sides.

The case 2 has upper and lower shell halves fixedly attached to each other in a lid-like manner, and has a lower surface and an upper surface provided with a magnetic head insertion opening 21 extending in a rectangular shape from the front end to the center. Although the magnetic head insertion opening on the upper surface is not shown, it is formed in the same position and the same shape as the lower surface.

In order to open and close the magnetic head insertion opening 21, a shutter member 3 slidable in the left-right direction in the figure is assembled at the front of the case 2. A shallow sliding groove 24 is formed on the surface of the case 2 in the sliding range of the shutter member 3.

The shutter member 3 is made of, for example, a stainless steel plate or an aluminum plate, or a plastic such as polyacetal resin, and upper and lower plate portions 31 covering the upper and lower surfaces of the front portion of the case 2 are provided with front end surfaces of the case. It is connected by the connecting plate part 32 to cover, and is formed in a U-shaped cross section. A rectangular window portion 33 is provided in the upper and lower plate portion 31 of the shutter member 3 at a position deviated from the center, and communicates with the magnetic head insertion opening 21 opened in the upper and lower surfaces of the case 2 to be fully opened. Can be opened to the public.

The lower plate 3 of the shutter member 3
1, two guide claw portions 34 and 35 are provided on the front edge of the window portion 33 and on the side edge side thereof, and are bent inward in a direction orthogonal to the face plate portion 31 and protrude. further,
A window 33 is provided on the inner surface of the connecting plate 32 of the shutter member 3.
A key-shaped engaging portion 36 protruding inward is provided in the vicinity of the guide claw portion 35 at a position away from the guide claw portion 35.

On the other hand, in the case 2, an elastic member 7 made of a torsion spring is provided at a front corner portion which approaches when the shutter member 3 moves to the right opening direction in the drawing. One end of the elastic member 7 is engaged through a slit groove 26 (see FIG. 2B) opened in the front end surface of the case 2. Then, the shutter member 3 is urged in the closing direction by the elastic member 7, and the window portion 33 is always at a position where it comes off from each magnetic head insertion opening 21, and closes the magnetic head insertion opening 21.

On the lower surface of the case 2 corresponding to the guide claws 34, 35 of the shutter member 3, there are formed concave groove-shaped guide grooves 22, 23 in which the guide claws 34, 35 slide, respectively. It is formed to extend in a direction substantially perpendicular to the insertion direction X. Both guide grooves 22 and 23 are formed continuously and linearly.

As shown in FIG. 2A, the shape of the guide claw 34 in the vicinity of the window 33 in the shutter member 3 and the shape of the guide groove 22 of the case 2 engaged with the guide claw 34 are as shown in FIG. The projecting height h from the inner surface is formed at a normal height, and the guide groove 22 has a bottom at a depth greater than the projecting height h, and does not penetrate the inner surface of the case 2.

On the other hand, the guide claw 35 on the elastic member 7 side of the shutter member 3 and the guide groove 23 engaged therewith
As shown in FIG. 2B, the protruding height H of the guide claw 35 from the inner surface is larger than the protruding height h of the other guide claw 34, and the guide groove 23 It is formed deeply through the lower surface.

The front edge of the case 2 is formed with tapered surfaces 27 and 28 for facilitating engagement of the guide claws 34 and 35 with the guide grooves 22 and 23, respectively.

With the above structure, the engagement between the guide claw 35 and the guide groove 23, which is closer to the elastic member 7 of the shutter member 3, has a large engagement height and is hard to be disengaged. Does not separate the guide claw 35 from the guide groove 23. Further, the guide groove 2
Even if the through hole 3 is formed, the other guide groove 22 has a bottomed structure so that the strength of the front end of the case 2 can be sufficiently secured.

In FIG. 1, a spindle hole 25 from which the center core member 5 is exposed is formed in a circular shape at the center of the lower surface of the case 2. A notch 8 for preventing erroneous insertion is provided at one corner of the front end of the case 2 at an angle. On the other side, an identification hole 11 for identifying the recording capacity is provided.

FIG. 3 shows another embodiment, in which the guide claw 34 on the window 33 side of the shutter member 3 has a normal width d in the moving direction as shown in FIG. On the other hand, the guide claw 35 on the elastic member 7 side has a large width D in the moving direction as shown in FIG.

The protrusion height of the guide claw portion 35 on the elastic member 7 side may be set high as shown in FIG.
The projection height may be as low as the other guide claw portion 34. In such a case, the guide groove 23 with which the guide claw portion 35 is engaged is not provided with a through structure, but is provided with a bottom.

As the width of the guide claw 35 in the moving direction is increased, it is necessary to increase the width of the tapered surface 28 at the portion where the guide claw 35 goes over during assembly.

Also in this embodiment, the engagement between the guide claw 35 on the elastic member 7 side and the guide groove 23 has a large width in the moving direction, and a drop impact force acts on the corner on the elastic member 7 side. Can be held without coming off.

The positions of the guide claws 34, 35 in the shutter member 3 may be set on both sides of the window 33. Further, a guide claw may be provided on the upper surface plate portion or both the upper and lower surface plate portions of the shutter member 3, and a guide groove is formed on the upper surface or the lower surface of the case 2 accordingly. Also, the protrusion height or the width in the moving direction of the guide claw portion on the elastic member side is provided to be larger than the other guide claw portions.

[Brief description of the drawings]

FIG. 1 is a bottom view of a magnetic disk cartridge according to one embodiment of the present invention with a shutter member removed.

FIG. 2 is a cross-sectional view of an essential part showing a structure of guide claws on both sides of a shutter member and guide grooves of a corresponding case.

FIG. 3 is a bottom view of a main part of guide claws on both sides of a shutter member according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk cartridge 2 Case 21 Magnetic head insertion opening 22, 23 Guide groove 27, 28 Tapered surface 3 Shutter member 31 Face plate 32 Connecting plate 33 Window 34, 35 Guide claw 36 Engagement part 5 Center core member 6 Magnetic disk media

Claims (2)

[Claims] 1. A disk-shaped magnetic disk medium is rotatably housed in a case, and a magnetic head insertion opening, a shutter member for opening and closing the magnetic head insertion opening, and a shutter member are closed in the case. A magnetic disk cartridge provided with an elastic member biasing in a direction, wherein a plurality of guide claws protruding inward are provided on a face plate of the shutter member, and the guide claws are provided near a front end of the case. A guide groove having a concave groove structure that is inserted and guides the opening and closing movement of the shutter member and that extends in a direction substantially orthogonal to the cartridge insertion direction is provided, and a guide claw provided on the elastic member side of the guide claw is provided. A magnetic disk cartridge characterized in that the protruding height is provided to be greater than the protruding height of other guide claws. 2. A disk-shaped magnetic disk medium is rotatably accommodated in a case, and a magnetic head insertion opening, a shutter member for opening and closing the magnetic head insertion opening, and a shutter member are closed in the case. A magnetic disk cartridge provided with an elastic member biasing in a direction, wherein a plurality of guide claws protruding inward are provided on a face plate of the shutter member, and the guide claws are provided near a front end of the case. A guide groove having a concave groove structure that is inserted and guides the opening and closing movement of the shutter member and that extends in a direction substantially orthogonal to the cartridge insertion direction is provided, and a guide claw provided on the elastic member side of the guide claw is provided. A magnetic disk cartridge having a width in the moving direction larger than a width of another guide claw in the moving direction.