JPS62295287A - Disk cassette - Google Patents

Abstract

PURPOSE:To remarkably minimize an occupied area by the shifting of a light protector and to improve the function of a disk cassette by constituting the light protector in a disk shape to form a notch or a hole, providing it rotatably, rotating the protector and opening and closing an aperture part. CONSTITUTION:A light protector 9 is formed in a disk shape having an approximately 90 deg. sectorial notch part 9a, has a level difference and the diameter of an upper part 9c is smaller than that of a lower part 9b. On the surface of the upper part 9c, a groove 9d is formed in a straight line and the bottom surface of the groove 9d is formed in circular arcuate shape. The light protector 9 is fitted through the level inside a circularly formed window 7 of a lower case 4, and provided rotatably in the clockwise direction and the counterclockwise direction. Namely, the light protector 9 is rotated in the clockwise direction or the counterclockwise direction by engaging a coin, etc., with the groove 9d and adding the force by a user.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Industrial Application Field] The present invention is directed to a recording/reproducing device that stores a disk as a recording medium and is removably attached to a recording/reproducing device for recording and reproducing information on the disk. This invention relates to the disc cassette used.

[Prior Art] As a disk cassette of this type, there is a magnetic disk cassette that rotatably stores a magnetic disk as a recording medium and is used by being detachably attached to a magnetic disk drive device of a magnetic recording and reproducing device.

FIGS. 3(A) and 3(B) illustrate the structure of a conventional Fj1 disc cassette (hereinafter abbreviated as cassette), showing the top and bottom surfaces of the cassette, respectively. The original cassette is constructed by joining an upper case 3 and a lower case 4, and a magnetic disk 1 is rotatably housed inside the case.

A center hole 4b is formed in the center of the lower case 4 for chafing the center hub 2, which supports the center of the magnetic disk 1, around the FDD spindle shaft. Furthermore, head windows 3a and 4a for accessing the magnetic disk 1 are formed at the center of the tip sides (upper part in the figure) of the upper case 3 and lower case 4. head wind 3a,
4a is opened and closed by a disk protection shaft 5 which is movably provided with respect to the cassette.
The shutter 5 is formed with an opening 5a corresponding to the head windows 3a, 4a.

Further, the upper case 3 and the lower case 4 are provided with a first opening, which is an opening for optically or mechanically detecting the prohibition, in order to prohibit writing in order to prevent the information recorded on the magnetic disk l from being erased by mistake. and a second window 6.7 are formed facing each other.

The first window 6 is formed into a substantially square shape, the second window 7 is formed into a rectangular shape larger than the first window 6, and the first window 6 directly faces the upper part of the second window 7 in the figure.

A light protector 8 is fitted into the second window 7 to open and close the upper part directly facing the first window 6, as shown in enlarged form in FIGS. 4(A) and CB.

The light protector 8 is formed into a rectangular plate shape whose outer shape is slightly larger than the window 7, and as shown in FIG. A flat, substantially square convex portion 8b is formed in the half portion.

The light protector 8 is fitted inside the window 7 portion of the lower case 4 and the portion adjacent above it so as to be slidable in the directions of arrows A and B. In this case, the surface of the convex portion 8b is Almost flush with the surface. The light protector 8 is moved in the direction of arrows A and B in both figures, that is, in the longitudinal direction of the window 7, when the user of the cassette applies force by applying force to the surface of the convex portion 8b.

When the light protector 8 is in the position shown in FIG. 4(A), the upper part of the window 7 directly facing the window 6 is closed by the lower half of the light protector 8. This state indicates that writing is not prohibited.

Also, from this position, the light protector 8 is
When the light protector 8 is moved to the position shown in FIG.
is located above the window 7, opens it, and directly faces the window 6.

This state indicates write protection, and when the cassette is inserted into the magnetic disk drive device in this state, the optical sensor of the drive device or the mechanical The mechanism detects write protection.

[Problems to be Solved by the Invention] Incidentally, in order to improve the functions of the cassette as described above, it is desirable to make the write protector 8 small and to minimize the area occupied within the cassette by its movement.

However, with the above-described structure, there is a problem in that the area occupied by the movement of the light protector 8 becomes about 1.5 times or more the area of the window 7.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a write protector that has an opening for detecting write inhibition on a disc of a stored recording medium and that opens and closes the opening. In the disk cassette, the write protector is formed into a disk shape with a notch or hole formed and is rotatably provided, and the opening is opened and closed by rotating the protector.

[Function] According to this structure, the area occupied within the cassette by the movement of the write protector is the same as the area occupied by the protector itself. In the conventional structure, the area occupied by the movement of the protector was about 1.5 times larger than the area occupied by the protector itself.

Therefore, if the size of the protector itself of the present invention is the same as that of the conventional protector, the area occupied by movement will be significantly smaller than that of the conventional protector.

[Example] Hereinafter, details of embodiments of the present invention will be described.

Figure 1 (A), (B) and Figure 2 (A).

(B) explains the structure and operation of the write protector of the magnetic disk cassette and its fitting portion according to the embodiment of the present invention. The structure of the cassette write protector and the parts other than its fitting part is the same as that of the conventional example described above, and the explanation thereof will be omitted.

As shown in FIGS. 1(A) and 1(B), the unembodied write protector 9 is formed into a disk shape with a fan-shaped notch 9a of approximately 90", and has a step and a lower part. The diameter of the upper part 9C is smaller than that of the upper part 9b.Furthermore, a groove 9d is formed in a straight line on the surface of the upper part 9C.
The bottom surface of d is curved into an arc shape.

The write protector 9 is shown in FIG. 2(A).

As shown in (B), a circular window 7 of the lower case 4
It is fitted inside through a step and is rotatable clockwise and counterclockwise in both figures.

In this embodiment, the window 6 of the upper case 3 is formed into a fan shape corresponding to the notch 9a of the light protector 9.
When the light protector 9 is in the rotational position shown in FIG. 2(A), the notch 9a.

are formed in the position facing directly.

With this structure, the light protector 9 is closed.

When the user of the device engages a coin or the like in the groove 9d and applies force, the device is rotated clockwise or counterclockwise in FIGS. 2(A) and 2(B).

When the write protector 9 is in the rotational position shown in FIG. 2(A), the window 6 of the upper case 3 and the notch 9a face each other and communicate with each other, indicating that the window 6 is open and write is prohibited. It will be done.

Furthermore, when the light protector 9 is in the rotational position shown in FIG. 2(B), the positions of the window 6 and the notch 9a are shifted,
is closed, indicating that it is not write-protected.

According to this embodiment, the area occupied within the cassette by the movement of the write protector 9 is the same as the area occupied by the protector 9 itself. In the conventional structure, the area occupied by the movement of the protector is larger than the area occupied by the protector itself.1.
It was about 5 times larger.

Therefore, if the size of the protector 9 itself of the present invention is the same as that of the conventional protector, the area occupied by movement will be significantly smaller than that of the conventional protector.

Note that the shape of the notch 9a is of course not limited to a fan shape, and may be any shape that does not hinder the rotation of the light protector and is convenient for opening and closing the window 6. In addition, the position and shape of the groove 9d for applying force to the write protector 9 are not limited to those shown in the drawings, and it is also possible to provide a convex portion in place of the groove 9d.

Furthermore, as a modification of this embodiment, as shown in FIG. 82(C), the end of the write protector 9 is connected to the upper case 3. Attach the light protector 9 to the upper case 3. so that it is exposed from the end surface of the lower case 4. The light protector 9 is rotatably installed in the lower case 4, and the light protector 9 is rotated by applying force to the exposed part.
The windows 6.7 of the lower case 4 may be opened and closed.

Further, the structure related to the write protector as described above is of course applicable not only to magnetic disk cassettes but also to other disk cassettes.

[Effects] As is clear from the above description, according to the present invention, there is provided a disk cassette that has an opening for detecting write inhibition on the disk of a stored recording medium and is equipped with a write protector that opens and closes the opening. In the above, the light protector is constructed in the shape of a disc with a notch or a hole formed and is rotatably provided, and the opening is opened and closed by rotating the protector, so that the structure can be easily implemented at low cost. As a result, the area occupied by the movement of the write protector can be made much smaller than in the past, and the excellent effect of improving the functionality of the disk cassette can be obtained.

[Brief explanation of the drawing]

FIGS. 1(A) and (B) are a plan view and a side view, respectively, showing the structure of a write protector for a magnetic disk cassette according to an embodiment of the present invention, and FIGS. 2(C) is a perspective view of the protector periphery explaining the structure of a modified example, and FIGS. 3(A) and 3(B) respectively show the structure of the conventional cassette. FIGS. 4(A) and 4(B) are plan views of the upper and lower surfaces of the cassette showing the structure, and enlarged plan views of the periphery of the write protector in FIG. 3(B) for explaining the structure and operation thereof. ■...Magnetic disk 3...Upper case 4...Lower case 6.7...Window 9...Light protector 9a...Notch 9d...Groove, 21] Aro fan Guda's Hand Reform H Prisoner Figure 1 (A) Choguchi Guda/)4 Ritatsu y7 Figure 1 (B) Figure 3 (,B) Day

Claims (1)

[Claims] In a disk cassette, the write protector has an opening for detecting write inhibition on the disk of a stored recording medium and is configured to open and close the opening, and the write protector is configured in the shape of a disk with a cutout or a hole formed therein. A disk cassette, characterized in that the protector is rotatably provided, and the opening is opened and closed by rotating the protector.