JPS6153787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first method that rotatably holds a disk-shaped recording medium such as a magnetic disk, and into which a driving body for rotationally driving the disk-shaped recording medium can be inserted. The cartridge has an opening, a second opening into which a head for recording or reproducing information on the disk-shaped recording medium can be inserted, and a sensor opening for detecting rotation of the magnetic disk. It is an object of the present invention to provide a cartridge having a structure in which a shielding member for opening and closing the opening of the cartridge can be easily assembled without causing incorrect installation.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is an exploded perspective view of the cartridge of this embodiment, and FIGS. 2 and 3 are a sectional view taken along the line AA in FIG. 1 and an enlarged view of the main parts.

In those drawings, steps 14a and 14b for cartridge insertion guides are shown on each side edge.
The inner surfaces of the lower plate 2a and the upper plate 2b having the same shape are formed so as to face each other.

A magnetic sheet 1, which is a disk-shaped recording medium capable of recording on both sides, is rotatably housed in a space 12 formed by a recess 12a of a lower plate 2a and a recess (not shown) of an upper plate 2b. The hub 6 has a spindle hole 8 into which a drive shaft (not shown) of a drive device is inserted, is attached to the center of the magnetic sheet 1, and rotates integrally with the magnetic sheet 1. As clearly shown in FIG. 2, this hub 6 is constructed by fitting and integrating hub components 6a and 6b from both sides of the magnetic sheet 1.

The hub 6 has stepped portions on the outer periphery of the upper and lower ends,
The magnetic sheet is loosely inserted into the hub holes 3a and 3b of the lower plate 2a and the upper plate 2b, and the movement of the drive shaft in the thrust direction and radial direction is controlled within the required range. The magnetic sheet 1 can be held without applying excessive force to the magnetic sheet 1.

The lower plate 2a and the upper plate 2b have elongated openings for abutting heads (not shown) for recording or reproducing information on the surface of the magnetic sheet and for moving the heads in the radial direction of the sheet. Sections 4a and 4b are provided. The band-shaped flexible member 10 is made of flexible resin such as vinyl chloride, and its both side edges are provided with lower plate guide grooves 13a that are provided on the inner surfaces of the lower plate 2a and the upper plate 2b to face each other. and an upper plate guide groove 13b (not shown), and is guided reciprocally in the longitudinal direction. A torsion spring member 15 is mounted between one end of the flexible member 10 in the longitudinal direction and the lower plate 2a, and is configured to urge the openings 4a and 4b to open and close using the shielding members 9a and 9b. It's getting old. Further, the flexible member 10 has a notch 10b on both side edges of the other end, and one of the shielding members 9a, 9b is provided between the notch 10b and the inner surfaces of the lower plate 2a and the upper plate 2b. The ends of the two are engaged in a pinched manner.

Further, the other ends of the shielding members 9a, 9b are provided with bosses 16a, which are provided concentrically with the hub holes 3a, 3b inside the lower plate 2a and the upper plate 2b.
16b (16b is not shown in FIG. 1). That is, the shielding member 9
a, 9b are slid and rotated to the positions of the openings 4a, 4b to shield them, and at the same time a detection hole 5a is provided for detecting the index hole 7 provided on the magnetic disk 1 for detecting the rotation of the magnetic disk. ,5b
By also shielding the space 12, the space 12 becomes sealed from the outside.

Note that the index hole detection holes 11a and 11b of the shielding member 9a are as shown in FIG.
The shielding member is rotated and slid around the center of rotation of the magnetic sheet 1, and is provided at a position where the opening 4a and the detection hole 5a are opened, and at a position symmetrical to that position. Therefore, the shielding member 9 is attached to the upper plate 2b.
When installing b, the assembly can be done without worrying about the installation direction.

As is clear from the above description, the cartridge of the present invention has an opening into which a head for recording or reproduction can be inserted, and a shield for shielding the sensor opening hole for detecting the rotation of the magnetic sheet when necessary. By making the shape of the member symmetrical, there is no distinction between the front and back, and this makes it possible to prevent incorrect installation when incorporating it into the plate with a simple structure, which has a very large effect. .

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure and FIG. 3 are a sectional view taken along the line AA in FIG. 1 and an enlarged view of the main parts. 1... Magnetic sheet, 2a... Lower plate, 2
b...Top plate, 3a, 3b...Hub hole, 4
a, 4b...opening, 5a, 5b...index ball detection hole, 6...hub, 7...index hole, 8...spindle hole, 9...shielding member, 11a, 11b...index detection hole.

Claims (1)

[Claims] 1. A rotatable disk-shaped recording medium, a first opening into which a driving body for rotationally driving the disk-shaped recording medium can be inserted, and a first opening for recording or reproducing information on the recording medium. a second opening into which a head can be inserted; a sensor opening for detecting the rotation of the recording medium disposed near the first opening; and a sensor opening hole for detecting rotation of the recording medium, and shielding the second opening when necessary. What is claimed is: 1. A cartridge comprising a shielding member for use in the cartridge, and the shielding member having a bilaterally symmetrical shape.