JPH0561869U - Disk cartridge - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a disk cartridge in which the inner surface of the shell is not scraped by the coil portion of the torsion coil spring when the shutter is opened and closed. A disk cartridge in which a shutter that opens and closes the head window is slidably attached to a shell that rotatably accommodates a magnetic disk, and the shutter is always biased in the closing direction by the elastic force of a torsion coil spring. In, while fitting the coil portion of the torsion coil spring into the fixed portion provided in the shell,
One end of the torsion coil spring is locked to a locking part provided on the shell and the other end is movably locked to a locking part provided on the shutter in correspondence with the slide of the shutter. It is characterized by having done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk cartridge, and more particularly to a disk cartridge in which the inner surface of the shell is not scraped by a torsion coil spring.

[0002]

[Prior Art]

 In a conventional disk cartridge, a shutter that opens and closes the head window is slidably attached to a shell that rotatably stores a magnetic disk, and the shutter is always biased in the closing direction by the elastic force of a torsion coil spring. As shown in FIG. 7, one end 41 of the torsion coil spring 4 is locked to the locking portion 21 provided on the shell 2 and the other end 42 is locked to the shutter. 3, the intermediate coil portion 5 is moved with respect to the shell 2 in correspondence with the sliding of the shutter 3 as shown in FIG.

[0003]

[Problems to be solved by the device]

 However, the arm portion of the torsion coil spring 4 between the coil portion 5 and the respective end portions 41, 42 is one wire (spring material), whereas the coil portion 5 is as shown in FIG. Since the wire is wound in a coil shape, there is a thickness corresponding to the wound wire (axial width in the coil portion 5). This thickness of the coil portion 5 is the inner dimension of the shell (the inner surface of the upper shell 2a). And the inner surface of the lower shell 2b). Therefore, as the coil portion 5 moves when the shutter 3 is opened and closed, the coil portion 5 moves along the inner surface of the upper shell 2a or the lower shell 2b. If shavings are generated, the shavings may interfere with the smooth movement of the coil part 5 and interfere with the opening / closing operation of the shutter 3, or may spread on the magnetic disk and cause magnetic damage. An error occurs when playing a disc, etc. Or caused that.

Therefore, an object of the present invention is to provide a disk cartridge in which the inner surface of the shell is not scraped by the coil portion of the torsion coil spring when the shutter is opened and closed.

[0005]

[Means for Solving the Problems]

 According to the present invention, a shutter that opens and closes the head window is slidably attached to a shell that rotatably stores a magnetic disk, and the shutter is always biased in the closing direction by the elastic force of a torsion coil spring. In the disk cartridge described above, the coil portion of the torsion coil spring is fitted into the fixing portion provided on the shell, and one end portion of the torsion coil spring is engaged with the engaging portion provided on the shell and the other end. The above object is achieved by providing a disk cartridge in which the end portion of the disk cartridge is movably locked to the locking portion provided on the shutter corresponding to the slide of the shutter.

[0006]

[Action]

 According to the disk cartridge of the present invention, since the coil portion of the torsion coil spring is fitted into the fixed portion provided on the shell, the coil portion does not move with respect to the shell, and the inner surface of the shell is scraped by the coil portion. There is no fear.

[0007]

【Example】

 An embodiment of the disc cartridge of the present invention will be described below with reference to the drawings. 1 is a plan view of the lower shell side of an embodiment of the disk cartridge of the present invention as viewed from the inside, FIG. 2 is a cross-sectional view of the embodiment shown in FIG. 1, and FIG. 3 is an embodiment shown in FIG. FIG. 2 is a view corresponding to FIG. 1 showing a state in which a shutter is opened.

As shown in FIG. 1, in the disk cartridge of this embodiment, a shutter 3 for opening and closing its head window is slidably attached to a shell 2 in which a magnetic disk is rotatably housed. The torsion coil spring 4 is elastically biased in the normally closing direction (to the left in FIG. 1), and these points are the same as those of the conventional product of this kind.

Therefore, in the disk cartridge of this embodiment, as shown in FIG. 1, the coil portion 5 of the torsion coil spring 4 is fitted into the fixing portion 6 provided in the lower shell 2b, and the torsion coil One end 7 of the spring 4 is locked to a locking part 8 provided on the lower shell 2b, and the other end 9 is locked to a locking part 10 provided on the shutter 3 so that the shutter 3 can slide. And is movably locked.

To further explain the disc cartridge of the present embodiment, as shown in FIG. 2, the fixing portion 6 is a cylindrical body having a diameter substantially equal to the inner diameter of the coil portion 5 and is formed on the inner surface side of the lower shell 2b by a shell inner dimension. Is formed so as to have a width substantially the same as that of. Further, one end 7 of the torsion coil spring 4 has a tip of an arm portion extending obliquely from a side in contact with the lower shell 2b of the coil portion 5 fitted in the fixing portion 6, and a tip of an arm portion of the lower shell 2b. The lower shell 2b is bent to the side, and is locked by a locking portion 8 provided in a recess in the corner of the lower shell 2b.

On the other hand, the other end portion 9 of the torsion coil spring 4 has a tip end of an arm portion that extends obliquely from the side in contact with the upper shell 2a of the coil portion 5 fitted in the fixing portion 6. It is bent toward the upper shell 2a, and is locked to the side edge of a strip-shaped locking portion 10 extending inside the front edge plate 11 of the shutter 3. When the shutter 3 slides from the closed state (the state shown in FIG. 1) to the open state (the state shown in FIG. 3) or vice versa, the above-mentioned end portion 9 contacts the side edge of the locking portion 10. It is designed to be able to slide while.

In the disk cartridge of the present embodiment configured as described above, since the coil portion 5 of the torsion coil spring 4 is fitted into the fixing portion 6 provided on the lower shell 2b, when the shutter 3 is opened and closed, The coil portion 5 does not move with respect to the lower shell 2b, and there is no risk that the inner surface of the lower shell 2b or the upper shell 2a will be scraped off by the coil portion 5.

FIG. 4 is a view corresponding to FIG. 1 of the second embodiment of the disk cartridge of the present invention, FIG. 5 is a sectional view of the fixing portion of the embodiment shown in FIG. 4, and FIG. FIG. 6 is a cross-sectional view showing how to insert and insert a torsion coil spring into a fixed portion in the embodiment shown. In the second embodiment, as shown in FIG. 5, the upper end surface 61 of the cylindrical fixing portion 6 projecting from the lower shell 2b is not an inclined surface inclined toward the front edge 14 side of the cartridge body 1. Moreover, the gap between the upper end surface (inclined surface) 61 and the inner surface of the upper shell 2a is made smaller than the thickness of the coil portion 5. Further, a plate-like stopper 12 is provided upright from the lower shell 2b in the vicinity of the fixed portion 6 on the side facing the front edge 14 of the cartridge body 1, and the locking portion 10 of the shutter 3 is provided. A protrusion 13 is provided at the tip. Then, as shown in FIG. 5, the coil portion 5 is fitted into the fixed portion 6 and is configured in the same manner as the first embodiment except the points described above.

The disk cartridge of the second embodiment described above also has the same effect as that of the first embodiment. Further, in the second embodiment, when the disc cartridge is assembled, as shown in FIG. 6, the coil portion 5 can be fitted and inserted into the fixed portion 6 by pushing it up from the side onto the fixed portion 6. Therefore, there is also an effect that the assembling work of the disc cartridge is facilitated. The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the fixing portion 6 is provided on the lower shell 2b, but the fixing portion 6 does not cause any trouble. As long as it is provided on the upper shell 2a.

[0015]

[Effect of the device]

 In the disk cartridge of the present invention, when the shutter is opened and closed, the inner surface of the shell is not scraped by the coil portion of the torsion coil spring.

[Brief description of drawings]

FIG. 1 is a plan view of the lower shell side of an embodiment of a disk cartridge of the present invention as viewed from the inside.

2 is a cross-sectional view of the embodiment shown in FIG.

3 is a view corresponding to FIG. 1 showing a state in which a shutter is opened in the embodiment shown in FIG.

FIG. 4 is a view corresponding to FIG. 1 of a second embodiment of the disc cartridge of the present invention.

5 is a cross-sectional view of a fixed portion of the embodiment shown in FIG.

FIG. 6 is a cross-sectional view showing a method of inserting a torsion coil spring into a fixing portion in the embodiment shown in FIG.

FIG. 7 is a view of a conventional disc cartridge corresponding to FIG. 1.

FIG. 8 is a view corresponding to FIG. 3 of a conventional disk cartridge.

FIG. 9 is a view of a conventional disk cartridge corresponding to FIG.

[Explanation of symbols]

 1 Cartridge main body 2 Shell 3 Shutter 4 Torsion coil spring 5 Coil part 6 Fixing part 7 End part 8 Locking part 9 End part 10 Locking part

Claims (1)

[Scope of utility model registration request] 1. A shell for rotatably storing a magnetic disk is slidably attached with a shutter for opening and closing its head window, and the shutter is always biased in the closing direction by the elastic force of a torsion coil spring. In the disc cartridge, the coil portion of the torsion coil spring is fitted into the fixing portion provided on the shell, and one end portion of the torsion coil spring is engaged with the engaging portion provided on the shell and the other end of the torsion coil spring is engaged. A disk cartridge characterized in that an end portion is locked to a locking portion provided on the shutter so as to be movable in correspondence with sliding of the shutter.