JPH10302433A - Shutter member of magnetic disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the common use of a shutter opening/closing mechanism for obtaining the low-order compatibility and also to increase the reliability by suppressing the generation of dust in the manner of eliminating the generation of burrs to the part abutting on a shutter opening/closing member. SOLUTION: The shutter member 3 to open/close an opening 21 for inserting a magnetic head on the magnetic disk cartridge 1 wherein magnetic disk media 6 are rotatably housed inside a case 2, is constituted with upper/lower face plate parts 31, 32 for covering the opening 21 for head insertion and a connection plate part 32 for connecting both of the face plate parts to nearly the U-shaped state in the vertical surface, and also recessed parts 38, 39 are formed on the end parts of the connection plate part 33 so that the side end parts of the connection plate part 33 are positioned on the inner sides than the side end parts of the face plate parts 31, 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter member for opening and closing a magnetic head insertion opening in a disk-shaped magnetic disk cartridge in which a particularly large-capacity magnetic disk medium is accommodated in a case.

[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 rotated. A magnetic disk cartridge in which a so-called floppy disk is accommodated 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.

Further, the magnetic disk cartridge has a magnetic head insertion opening through which a magnetic head for magnetic recording and reproduction is brought in and out of one or both sides of the magnetic disk medium for external contact or close proximity. The opening is provided with an opening / closing shutter member for preventing intrusion of dust and the like when not in use. In addition, such magnetic disk cartridges are always required to have a large capacity.

When a magnetic disk cartridge having a recording capacity higher than that of a conventional product is provided, a drive device for driving the large-capacity type magnetic disk cartridge is newly provided. This new drive device can drive a new large-capacity type magnetic disk cartridge, and of course, in many cases, is a so-called "lower-compatible" function, that is, lower in terms of recording capacity for the convenience of the user. It is often formed to have a function of driving a conventional so-called small-capacity magnetic disk cartridge.

[0005]

The above-mentioned large-capacity magnetic disk cartridge has a linear recording density and a recording track pitch which are increased as compared with the conventional one in order to increase the recording capacity, and its reliability is improved. Therefore, it is necessary to minimize the attachment of foreign matter to the magnetic disk medium. Further, in order to secure the above-mentioned backward compatibility function, the shutter opening / closing means in the large-capacity type drive device is shared with the conventional opening / closing means so that the mechanism for obtaining the backward compatibility function is not complicated. There is a need to.

In view of the above, in a large-capacity type magnetic disk cartridge, the shutter member is provided in the same shape as the shutter member in the lower magnetic disk cartridge, and the similar shutter opening / closing member comes into contact with the shutter opening / closing operation. It is preferable to provide it. Further, it is necessary to reduce the generation of dust by shaving the surface of the shutter opening / closing member in accordance with the opening / closing operation of the shutter member. It is also desirable from the viewpoint of cost reduction that the manufacturing process of the shutter member can substantially use the process of the conventional magnetic disk cartridge.

In the case where the shutter member is formed of a metal plate as described above, a hoop-shaped metal material is subjected to continuous punching of the developed shape of the shutter member, and then the developed shape is pressed. It is bent into a U-shaped cross section by processing, and the connecting part connecting the shutter members is cut in the final step to manufacture the shutter member. Since burrs are unavoidable in the above punching and cutting processes, the burrs are flattened in the middle of the process, or barreled after completion, so that the direction of the burr is It is necessary to detoxify or completely remove the member or the case so as not to come into contact with the member, the case, and the like, which has a problem of increasing the manufacturing cost of the shutter member.

In particular, burrs generated in the final cutting step of the connecting portion come into contact with a shutter opening / closing pin which comes into contact with the shutter member to open and close the shutter member, slide in accordance with the operation, and slide on the surface of the shutter opening / closing pin. There is a possibility that the metal powder may be cut off by burrs, the metal powder may enter the inside of the case through the opening for inserting the magnetic head and adhere to the surface of the magnetic disk medium, thereby lowering the reliability. And, since removal of the burrs cannot be performed by face beating, there is a problem that it is unavoidable to apply barrel processing to the burrs on the cut surface.

In view of the above circumstances, the present invention seeks to use a common shutter opening / closing mechanism, eliminate the barrel processing step after the cutting step, eliminate burrs at the contact portion with the shutter opening / closing member, and generate dust. The object of the present invention is to provide a shutter member of a magnetic disk cartridge which suppresses the occurrence of a magnetic field and improves the reliability.

[0010]

A shutter member of a magnetic disk cartridge according to the present invention, which solves the above problems, rotatably accommodates a disk-shaped magnetic disk medium in a flat case and inserts a magnetic head into the case. A magnetic disk cartridge provided with a shutter member that opens and closes and opens and closes the head insertion opening by sliding the head insertion opening in a direction perpendicular to the direction of insertion into the disk drive device. An upper and lower face plate portion that covers the head insertion opening along, and a connection plate portion that connects the double-sided plate portions in a substantially U-shaped cross section,
A guide claw that engages with a guide groove provided in the case provided on the face plate in parallel with the front edge and a shutter spring that urges the shutter member provided on the connection plate in a normal closing direction are engaged. And a concave portion is formed at the end of the connecting plate so that at least the side end of the connecting plate is located inside the side end of the face plate. Things.

Further, the concave portion is provided at least at an end portion which comes into contact with a shutter opening / closing member provided on the drive device side when the shutter is opened, and the shutter opening / closing member is provided so as to come into contact only with an end portion of the face plate portion. Is preferred.

Further, it is preferable that the concave portion is also enlarged at the edge portion of the face plate portion which is continuous with the concave portion of the connecting plate portion.

[0013]

According to the shutter member of the magnetic disk cartridge of the present invention as described above, the side edge of the connecting plate for connecting the upper and lower face plates is located inside the side edge of the face plate. Even if burrs are generated in the final cutting step in the manufacturing process, the direction of the burrs along with the formation of the above-mentioned concave part is different from that of another shutter opening / closing member in opening / closing sliding of the shutter member. Without contact with the case, there is no generation of dust due to the sliding, the amount of dust adhering to the magnetic disk medium can be reduced, and the reliability of recording quality on the magnetic disk medium can be improved.

Further, as described above, since the cutting burr generated in the final cutting step of manufacturing the shutter member can be made to have a shape which does not effectively affect, the barrel processing step after the cutting step is unnecessary, and the manufacturing process is simplified. It is possible to reduce the cost by the conversion. Further, the entire shape of the shutter member is made common to the shape of the shutter member in the lower magnetic disk cartridge, so that the shutter opening / closing means installed in the drive device can be shared, and the structure for obtaining the lower compatibility function can be simplified. .

Further, when the concave portion is provided at least at the end portion which comes into contact with the shutter opening / closing member, the shutter opening / closing member which comes into contact with the shutter member to open / close the shutter member does not come into contact with the connecting plate portion. The abutment comes into contact only with the end of the portion, and no scraping occurs in the contact sliding.

Further, if the recesses are enlarged at the edges of the face plate portion that is continuous with the recesses of the connecting plate portion, the processing accuracy in bending and the like is eased, and the manufacturing is facilitated.

[0017]

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 an exploded perspective view of an example magnetic disk cartridge. In addition, in the figure, in order to clarify the structure, the thickness and the like of each part are shown in a ratio different from the actual size.

A magnetic disk cartridge 1 is a disk-shaped magnetic disk held by a center core 5 in a flat case 2 (hard case) made of a synthetic resin such as acrylonitrile-butadiene-styrene copolymer. The media 6 is rotatably accommodated. The magnetic disk medium 6 is formed by forming a magnetic layer on one or both sides of a disk-shaped base made of a flexible polyester sheet or the like.

The case 2 has the inner surfaces of two shell halves fixed to each other in a lid-like manner. The upper surface 2a and the lower surface 2b of the case 2 near the front end surface 2c have openings 21 (lower surface) for inserting a magnetic head. (Not shown) is provided in a rectangular shape. A hub hole (not shown) for driving the magnetic disk medium, which exposes the center core 5, is formed in a circular shape at the center of the case lower surface 2b.

Further, a shutter member 3 slidable in an opening / closing direction orthogonal to the insertion direction is attached to the case 2 to open and close the magnetic head insertion opening 21. 2 has a shallow sliding groove 23 formed on the surface.

The shutter member 3 is made of metal, for example, is formed from a stainless steel plate or an aluminum plate and has a substantially U-shaped cross section.
The upper surface plate portion 31 that covers the case a and the lower surface plate portion 32 that covers the case lower surface 2b are connected by a connection plate portion 33 that covers the case front end surface 2c. The upper plate portion 31 and the lower plate portion 32 of the shutter member 3 are provided with a window 34 having a rectangular opening.
Can be communicated with. The window 34 is provided at a position offset from the center of the shutter member 3.

The upper surface plate portion 31 of the shutter member 3 has a guide claw portion 35 which bends and projects in a direction substantially perpendicular to the lower surface plate portion 32 on the front edge portion and the side end side of the window portion 34. , 36 are provided. The guide claws 35 and 36 are engaged with the guide grooves 24 formed in the front edge of the upper surface 2a of the case 2 in parallel with the front end surface 2c, and slide the slide of the shutter member 3 in a parallel manner. I do.

Further, on the inner surface of the connecting plate portion 33 of the shutter member 3, a key-shaped engaging portion 37 protruding inward is provided at an end side away from the window portion. The front end face 2c of the case 2 has a slit groove 2
5 is opened, and one end of a shutter spring (not shown) for urging the shutter member 3 in the normal closing direction through the slit groove 25 is engaged with the engaging portion 37.

In the shutter member 3 as described above,
Concave portions 38 and 39 are formed at both end portions of the connecting plate portion 33. Due to the formation of the concave portions 38 and 39, the side end of the connecting plate portion 33 is provided so as to be located inside the side end of the face plate portions 31 and 32.

The shutter opening / closing pin 41 of the shutter opening / closing means 40 installed in the drive device comes into contact with one end of the shutter member 3 and presses the shutter member 3 in the opening direction. The pin 41 does not come into contact with the end of the connecting plate 41 due to the formation of the recess 38.

Although the recesses 38 and 39 are provided on both sides in the illustrated example, at least the shutter opening / closing pin 4 provided on the drive device side at the time of shutter opening operation.
The shutter opening / closing pin 4
1 may be provided so as to abut only the ends of the face plate portions 31 and 32, but if provided on both sides, the concave portion 39 of the portion not in contact with the shutter opening / closing pin 41 is formed in the case 2.
It is more preferable that no burrs are generated.

Further, as shown in FIG. 2, another embodiment of the shutter member 3 is provided with concave portions 38 ', 39' formed at the end of the connecting plate portion 33, and the face plate portions 31, 3
The edge of No. 2 is also removed in a stepped manner to form an enlarged shape.
The range of formation of the recesses 38 ′, 39 ′ of the face plate portions 31, 32 is from the bent position with the continuous plate portion 33 to the contact position of the shutter opening / closing pin 41. Other configurations are the same as those of the previous example, and the same components are denoted by the same reference numerals and description thereof will be omitted.

Next, as shown in FIG. 3, the shutter member 3 is formed by punching and bending a metal material 45 wound in a hoop shape.
5 is continuously punched in a developed shape, and is formed by bending the connecting plate 33 along the bending curves on both sides. The punched shape is set so that the longitudinal direction of the roll-shaped metal material 45 and the extending direction of the connecting plate portion 33 match. Then, when the connecting plate portion 33 of the adjacent shutter member 3 is cut, the connecting plate portion 33 is bent by being cut into a shape including the concave portions 38 and 39 described above.

The disk drive device into which the magnetic disk cartridge 1 is inserted has a magnetic head at the back and a drive unit below.
The spindle is locked to the center core 5 of the magnetic disk medium 6 of the inserted magnetic disk cartridge 1 and is driven to rotate.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a magnetic disk cartridge according to an embodiment of the present invention in a state before a shutter member is assembled.

FIG. 2 is a perspective view of a shutter member according to another embodiment.

FIG. 3 is an explanatory view showing a manufacturing process of the shutter member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk cartridge 2 Case 2a Upper surface 2b Lower surface 2c Front end surface 3 Shutter member 6 Magnetic disk media 21 Head insertion opening 23 Sliding groove 31 Upper surface plate portion 32 Lower surface plate portion 33 Connecting plate portion 34 Window portion 35, 36 Guide claw portion 37 engaging portion 38, 39 concave portion 40 shutter opening / closing means 41 shutter opening / closing pin

Claims (1)

[Claims] 1. A disk-shaped magnetic disk medium is rotatably accommodated in a flat case, and a magnetic head insertion opening is opened in the case. In a magnetic disk cartridge provided with a shutter member that slides and opens and closes in an orthogonal direction, the shutter member includes upper and lower face plate portions that cover the head insertion opening along upper and lower surfaces of a case,
A connecting plate that connects the two-sided plate in a substantially U-shaped cross section; a guide claw that is provided in the face plate and that is engaged with a guide groove that is installed in the case in parallel with a front edge portion; And an engaging portion with which a shutter spring that urges the shutter member in the normal closing direction is provided, and at least a side end of the connection plate portion is located inside a side end of the face plate portion. A shutter member for a magnetic disk cartridge, wherein a concave portion is formed at an end of the connecting plate portion so as to be located.