JPH05189913A - Disk housing case - Google Patents

Abstract

PURPOSE:To prevent the dislodgment of an energizing member, to reinforce a body and to prevent the intrusion of dust by determining the height of the inside wall of a rim part in sliding contact with the energizing member, the height of the spring hooking part of a shutter member and the height of the spacing in an aperture for insertion of the energizing member in such a manner as to satisfy prescribed relations. CONSTITUTION:A guide groove part 9 of a lower case 2 for guiding the opening and closing shutter member 8 of the disk housing case is built up and a projecting part 14 is formed. The aperture is formed to the min. required size, the dislodgment of the energizing member is prevented, the housing case body is reinforced and the intrusion of the dust is prevented if the height T of the projecting shape part 14 of the rib part in sliding contact with the energizing member 10 of a flat spring for closing and energizing the shutter member, the spring hooking height H of the member 8, the wire diameter d of the member 20 and the height W of the spacing of the aperture 17 for insertion of the energizing member are determined so as to satisfy the relations of T<H and d<W<2d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk storage case containing a disk-shaped recording medium (disk having a signal recording surface, for example, a magnetic disk), and more specifically, an upper case and a lower case for storing the magnetic disk. The present invention relates to an insertion hole of a shutter spring (urging member) for urging a shutter that opens and closes a magnetic head insertion hole formed in a disk storage case main body composed of and to a magnetic head insertion hole blocking position.

[0002]

2. Description of the Related Art A cassette type magnetic disk (for example, 3.5 inch micro floppy disk) in which a disk-shaped recording medium, for example, a flexible magnetic disk is housed in a hard case is widely known.

In order to protect the magnetic disk, a shutter member having a U-shaped cross section is openably and closably attached to the magnetic disk storage case.

A conventional magnetic disk storage case of this type is provided with a metal center core at the center inside a thin box-shaped storage case body formed by joining an upper case and a lower case, which are formed in a substantially symmetrical shape. Magnetic disk is stored,
The center core is exposed to the outside through a central circular hole formed in the case body. At the time of recording / reproducing of this magnetic disk, the storage case is mounted on a recording / reproducing magnetic disk drive device, the center core is magnetically chucked by a spindle in the drive device, and the spindle rotates in the magnetic disk storage case. ..

Recording / reproduction of such a magnetic disk is performed by bringing a magnetic head provided in the drive device into contact with a rotating magnetic disk. Therefore, a rectangular lower case magnetic head insertion hole is formed in the lower case along the radial direction of the magnetic disk, and an upper case magnetic head insertion hole or a pad insertion hole has the same shape at a position corresponding to the lower case magnetic head insertion hole of the upper case. It is open. These magnetic head insertion holes or pad insertion holes are closed to prevent dust and protect the magnetic disk when the magnetic head is not inserted, and the shutter member is opened only during recording / reproduction to expose the magnetic disk to the outside. Has been taken.

The shutter member is a coil spring (Japanese Patent Laid-Open No. 64-76579), a leaf spring (Japanese Patent Laid-Open No. 2-101379).
Alternatively, a V-shaped torsion spring (Japanese Patent Laid-Open No. 63-281288)
The opening for inserting the head is always closed.

[0007]

By the way, in the above-mentioned spring for opening and closing the shutter, since the spring has the width of the coil spring portion and the leaf spring, the spring portion becomes thick and the inside of the case body for accommodating the spring portion is narrow. If it is stored in a space, the thickness of the case must be reduced, which not only has a problem in strength, but also makes it difficult to automatically insert the spring into the case.

When the shutter member is opened and closed, the biasing spring member expands and contracts to frictionally slide on the inner wall surface of the storage case body. In this case, of the springs, the particular part of the coil part and the biasing part of the leaf spring come into contact with the inner wall surface of the storage case and slide, so that the inner wall surface of the case body is scraped off when the disk storage case is used. , The generated friction powder adheres to the disc, and the reliability of recording / reproducing decreases.

Further, due to the unevenness on the inner wall surface of the case caused by the friction, the slidability of the spring is lowered and the shutter member does not operate smoothly. In more extreme cases, this uneven surface causes the arm part of the spring to be caught, and when a pressing force is applied, this pressing force concentrates on a specific part of the spring, causing the spring to break or fall off. Problems also arise.

Further, the work of assembling the shutter mechanism by the spring and the shutter member is difficult, and there is a drawback that automation is difficult to achieve. For example, a method of assembling a shutter mechanism as disclosed in Japanese Patent Laid-Open No. 59-72687 has been proposed, but this method is difficult to automate and the cost is high.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and improves the biasing force by improving the shape of the disk storage case for storing the shutter biasing member. Prevents the members (shutter springs) from falling off, reinforces the disk storage case body, prevents dust from entering the storage case, improves shutter assembly workability, and eliminates the problems caused by the biasing members inside the disk storage case. It is intended.

A disk storage case of the present invention which achieves the above-mentioned object is a disk storage comprising a disk having a signal recording surface and an upper case and a lower case which store the disk and in which an opening for inserting a recording head is formed. With the case body,
A disk storage case, comprising: a shutter member that is disposed in the storage case body to open and close the opening, and a biasing member that biases the shutter member to a position that closes the opening. A rib portion for slidingly contacting the urging member of the lower case, which guides the shutter member for opening and closing, the size of the opening shape for inserting the urging member of the disc housing case body for incorporating the urging member into the disc housing case body. Of the inner wall of the shutter member (T), the height of the spring-loaded portion of the shutter member (H), the wire diameter of the biasing member (d), the height of the gap for inserting the biasing member (W),
Then, T <H and d <W <2d are set.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk storage case of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view and a plan view of a flexible magnetic disk storage case (for example, a 3.5-inch micro-floppy disk) to which the present invention is applied, and FIG. 2A is an enlarged plan view of a biasing member (shutter spring). FIG. 2 (B) is an enlarged front view thereof.

The disk storage case A shown in FIG. 1 is composed of an upper case 1 and a lower case 2, in which a magnetic disk 3 is rotatably stored. The upper case 1 and the lower case 2 are formed in a substantially shallow dish shape in which joint walls having a constant height are provided along the outer peripheral edge over substantially the entire circumference. The case 1 and the lower case 2 are integrated by means such as ultrasonic welding. The upper case 1 and the lower case 2 are resin-formed products such as ABS resin containing an antistatic agent. In addition, a liner (not shown) made of non-woven fabric such as rayon is provided on the inner surface of the lower case 2 to prevent the magnetic disk 3 from being dropped out, worn, and static electricity by means of heat welding or ultrasonic welding. There is.

A magnetic disk 3 is housed in a case formed by combining the upper case 1 and the lower case 2. The magnetic disk 3 is a flexible magnetic disk based on a disk-shaped polymer film and having a magnetic layer formed uniformly on at least one surface thereof. A circular opening is formed in the center of the magnetic disk 3, and a ring-shaped center plate 4 is fixed to this opening. A motor shaft insertion hole is formed in the center of the center plate 4. A circular opening 5 is formed in the center of the lower case 2, and the center plate 4 is arranged in the opening 5 with some play.

A rectangular opening 6 for inserting a head is formed in each of the upper case 1 and the lower case 2, and the magnetic disk 3 is exposed through these openings 6. A recess 7 is formed on the outer surface of the upper case 1 and the lower case 2 including the portion where the opening 6 is formed, and a shutter member made of metal or synthetic resin having a substantially U-shaped cross section is formed in the recess 7. 8 is slidably attached to the shutter member 8
Is guided by a guide groove 9 formed in the lower case 2 and slides within the range of the recess 7. When the shutter member 8 comes into contact with the stepped portion in the concave portion 7, the stepped portion serves as a stopper so that the shutter member 8 cannot slide in the same direction in a normal state. Then, the shutter member 8 is slid by the operating means on the recording / reproducing apparatus side, and the recording / reproducing use state in which the magnetic disk 3 is exposed to the outside through the opening 6, and the opening 6 is closed by the shutter member 8 The shutter member 8 slides so as to protect the disk 3 and prevent the magnetic disk 3 from being exposed to prevent dust from entering.

The basic structure of the shutter member 8 may be the same as that of the conventional shutter member, and in this embodiment, it is the same as that of the conventional shutter member. Omit it. In addition, 10 is an opening window formed on the shutter surface of the shutter member 8,
Reference numeral 11 is a standing piece that engages with the guide groove portion 9, and 12 is a hook portion (spring hooking portion) with which the tip of one arm portion of the biasing member (shutter spring) 20 shown in FIG. 2 engages.

The tip of the other arm portion of the biasing member 20 is locked to a fixed portion (recess) 13 formed on a part of the inner wall of the upper case 1.

Therefore, the urging member 20 is inserted into the space formed between the upper case 1 and the lower case 2, and the tip of one arm portion thereof is locked to the fixing portion 13 of the upper case 1 and the other arm portion. The front end is locked to the hook portion 12 of the shutter member 8 and does not fall off in the vertical direction and the horizontal direction. Further, the biasing member 20 is fixed in the insertion direction of the disk storage case A by the returning force of the biasing member 20 itself.

FIG. 2 shows an embodiment of the biasing member 20 according to the present invention, (A) is a plan view and (B) is a front view.

The substantially W-shaped biasing member 20 is made by bending a thin wire such as an elastic stainless steel wire or a piano wire. That is, the biasing member
20 is the central curved portion 21 and the left and right straight portions 22A and 22B
And the left and right curved portions 23A and 23B and the left and right arm portions 24A and 24B
Due to this, a shape close to a symmetrical W-shape is formed. Here, R of the central curved portion 21 is formed to be larger than r of the left and right curved portions 23A and 23B (R> r). The tips of the arms 24A, 24B are bent portions 25A, 25B bent up and down at substantially right angles.
And is engaged with either the fixing portion 13 of the upper case 1 or the hook portion 12 of the shutter member 8.

When the biasing member 20 is incorporated in the storage case body A, the members can be accurately positioned by inserting the positioning pins with reference to the plurality of curved portions 21, 23A, 23B. This facilitates parts alignment and automatic assembly.

Further, the biasing member 20 having a shape having a plurality of curved portions has a compression resistance force at both ends which is smooth with respect to the stroke so that the shutter member 8 can be opened and closed easily, and the disc storage case is also provided. It can be installed in a narrow space inside the main body A, and the amount of deformation of the biasing member 20 is small so that a desired elastic force can be obtained, there is little contact with the upper case 1 and the lower case 2, and shavings due to case wear There are many advantages such as less occurrence of.

FIG. 3A is a partial plan view of the disk storage case A in which the shutter member 8 closes the opening 6.
FIG. 3B is a partial front view of the storage case. In addition,
A biasing member 20 shown by a chain double-dashed line in FIG. 3 shows a compressed state when the shutter member 8 is opened and the magnetic disk 3 is exposed through the opening 6. FIG. 4 is a partial plan view in which a part of the disk storage case A is broken, and the figure shows a state in which the upper case 1 is removed. 5A is a partial plan view of the lower case 2 of the disk storage case A, and FIG. 5B is a partial front view thereof. FIG. 6 shows the above disk storage case A.
6A and 6B are partial cross-sectional views of FIG.
6A is a sectional view taken along the line A ′, and FIG. 6B is a sectional view taken along the line BB ′.
Is a sectional view taken along line CC ′. 7A is a front view of the urging member 20, and FIG. 7B is a sectional view taken along the line DD ′ in FIG. 3 of the disk storage case A in which the urging member 20 is inserted.
(C) is a partial front view of the disk storage case A.

As shown in the sectional view taken along the line D-D 'in FIG. 7, the engaging height of the biasing member 20 on the case body side is h, and the shutter member 8 is.
When the height of the hook part (spring hooking part) 12 is H, h
<H, the biasing member 20 was supported by being inclined to the case body.

The guide groove portion 9 formed on the surface side of the lower case 2 of the disk storage case A is formed in a long groove shape in the opening / closing direction of the shutter member 8.

The outer wall forming the guide groove 9 projects inwardly of the disk storage case A (FIG. 6).
(See (B) and (C)). The wall thickness of the convex portion 14 of the guide groove portion is obtained by using the flat biasing member 20.
The thickness can be made sufficiently thicker than when a conventional coil spring or leaf spring is used. As a result, even if the strength of the case is increased, it is possible to insert the urging member from the outside into the narrow space in the disk storage case A and mount it at a predetermined position.

An inclined surface portion 16 is formed so as to be connected to the convex portion 14 and extend to an inner bottom surface portion 15 of the lower case 2.
When the urging member 20 expands and contracts, for example, the central curved portion 21 slides on the convex portion 14 and the inclined surface portion 16 and moves as shown in FIG. Even if it is deformed to the 2 side, it can move along the inclined surface portion 16.

Further, the height T of the convex portion (rib) 14
Is set to be slightly lower than the height H of the hook portion 12. A part of the biasing member 20 slides on the convex portion 14 to move. Therefore, the biasing member 20 is inclinedly arranged between H>T> h.

The gap height W between the top of the convex portion 14 and the lower surface of the biasing member insertion opening 17 of the upper case 1 is larger than the wire diameter d of the biasing member 20 and twice the wire diameter. The following narrow gap was set. Biasing member insertion opening having this narrow gap
17 is achieved by the biasing member 20 having a flat shape without a coil winding portion and having a W-shape in which elastic deformation is smooth when the shutter member 8 is opened and closed. When the urging member 20 is inserted into the disk storage case, the urging member 20 is loaded into the insertion device to have a compressed shape as shown in FIG. After entering and pushing it into a predetermined position, it is stretched by the elastic restoring force of the biasing member 20 and is elastically held between the hook portion 12 of the shutter member and the fixing portion (recess) 13 of the upper case 1.

FIG. 8 is a partially cutaway plan view of the disk storage case A showing the state where the shutter member 8 exposes the magnetic disk 3 from the opening 6. When the shutter member 8 is moved in a direction to open the opening 6 by an external force, the upright piece 11 of the shutter member 8 moves along the guide groove portion 9 and the arm portion 24B of the urging member 20 moves from the hook portion 12 to the hook portion 12. It comes into pressure contact and moves in compression against the spring pressure. During this movement process, the arm portions 24A to the curved portions 23A, 22A, 23B and the arm portions 24B are held in an inclined posture with respect to the inner surfaces of the upper case 1 and the lower case 2, and move with minimal contact with the inner surface of the case. ..

The central curved portion 21 is slidably and stably held on the convex portion 14 and the inclined surface portion 16. Although the convex portion 14 and the inclined surface portion 16 are provided only on the lower case 2 side in the above description, they may be formed on the inner surface of the upper case 1 facing the lower case 2. Further, the flat portion of the convex portion 14 may be extended to the movement range of the curved portion 21 at the center of the biasing member 20.

In the above-mentioned embodiment, the case of the W-shaped urging member was described, but the present invention is not limited to this, and the whole shown in, for example, Japanese Patent Laid-Open No. 63-247982 is in a plane. It can also be applied to a biasing member bent in a V shape.

In the above embodiment, the case of the magnetic disk cartridge as the disk storage case has been described, but the present invention is not limited to this, and other disk-shaped disks such as an optical disk cartridge and an optical magnetic disk cartridge can be used. It can also be applied to a disk cartridge containing a recording medium.

[0036]

As described above, according to the present invention, a flat W-shaped wire spring is used as the spring for urging the closing of the shutter member, and the spring for urging is provided in the disk storage case. The following excellent effects can be obtained by making the opening portion to be inserted from the outside into the minimum size in which the biasing spring can be inserted through.

Since the opening is extremely narrow, the spring for urging the shutter member can be prevented from falling off.

Since the rib portion (convex portion) forming the guide groove portion for opening and closing the shutter member of the disk storage case can be increased in thickness and reinforced, the case strength is improved.

Since the opening is narrow, the ingress of dust from the outside is covered.

Since the gap (W) between the openings is small, the appearance of the disk storage case is improved.

Since the opening is narrow, when the biasing spring is assembled, the position of the spring in the case is regulated and stabilized, so that the spring can be easily and reliably assembled.

[Brief description of drawings]

FIG. 1 is a front view and a plan view of a disk storage case to which the invention is applied.

FIG. 2 is an enlarged plan view and an enlarged front view of a biasing member.

FIG. 3 is a partial plan view and a partial front view of the disk storage case with a shutter member opened.

FIG. 4 is a partial plan view in which a part of the disc storage case is cut away.

FIG. 5 is a partial plan view and a partial front view of the lower case.

FIG. 6 is a partial sectional view of the disc storage case.

FIG. 7 is a front view of a biasing member, a partial front sectional view of a disk storage case, and a partial front view.

FIG. 8 is a plan view of a main part of the disc storage case with the shutter member closed.

[Explanation of symbols]

 1 Upper case 2 Lower case 3 Magnetic disk (disc-shaped recording medium) 8 Shutter member 9 Guide groove 10 Opening window 11 Standing piece 12 Hook part (spring hook part) 13 Fixed part (concave part) 14 Convex part (rib part) ) 15 Bottom part 16 Inclined surface part 17 Bias member insertion opening 20 Biasing member (W-shaped wire spring) 21 Central bending part 23A, 23B Left and right bending parts 24A, 24B Left and right arm parts 25A, 25B Bending Part A Disk storage case H Height of spring hooking part of shutter member T Height of convex part W Gap height of opening for biasing member insertion d Wire diameter of biasing member

Claims (1)

[Claims] 1. A disc storage case body comprising a disc having a signal recording surface, an upper case and a lower case for accommodating the disc and having an opening for inserting a recording head, and a storage case body. And a slide member that opens and closes the opening by sliding the opening and a biasing member that biases the shutter member to a position that closes the opening. For incorporating the biasing member,
The height (T) of the inner wall of the rib portion of the lower case that guides the shutter member to be opened and closed is slidably in contact with the urging member for opening and closing the urging member of the disc storage case body.
When the height (H) of the spring-engaged portion of the shutter member, the wire diameter (d) of the biasing member, and the gap height (W) of the biasing member insertion opening are T <H, and d <W <2d
A disk storage case that is set to dimensions that satisfy the above.