JPH0513353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge, and more particularly to a cartridge case thereof and a shutter slidably supported thereon.

[Conventional technology]

Figures 10 and 11 are conventional
10 is a perspective view of the magnetic disk cartridge, and FIG. 11 is an exploded perspective view of a case body used in the magnetic disk cartridge.

In the case of this magnetic disk cartridge, as shown in FIG.
It is composed of a thin intermediate plate 6 having a circular disk storage hole 5 in the center, a lower plate 9 having a wide recess 7 into which a magnetic head is inserted, and a drive hole 8.

By overlapping, the recessed notches 2 and 7 match in position in the upper and lower directions, and most of the disk storage holes 5 are located between the upper surface plate 4 and the lower surface plate 9.
As shown in FIG. 10, a magnetic disk 10 is rotatably housed in a space defined by these. This magnetic disk 10 is made of a flexible thin magnetic sheet, and has a hub 12 fixed in the center.
8 respectively. The connecting portion 11 of the intermediate plate 6 is exposed at the recessed portions 2 and 7 of the upper and lower plates 4 and 9, and the surface of the connecting portion 11 is just one level lower than the surface of the upper and lower plates 4 and 9. It's summery. Note that the periphery of the magnetic disk 10 is located inside this connecting portion 11, as shown in FIG.

In the case of this magnetic disk cartridge, a magnetic disk 10 of a magnetic head attached to a recording/reproducing device is used.
Since the stroke for the magnetic head can be made shorter than that of the conventional one, it has the advantage of high accuracy in lowering the magnetic head relative to the magnetic disk 10, but it is not without its drawbacks.

In other words, with this magnetic disk cartridge,
Since there is no shutter to cover the recesses 2 and 7 into which the magnetic heads are inserted, dust and the like can fall onto the magnetic disk 10 when the disk cartridge is not in use.
It adheres to the surface of the computer and adversely affects the recording and reproducing characteristics.

Incidentally, in order to prevent the intrusion of dust, a normal U-shaped shutter can be attached, but in this case, the magnetic head will pass over the connecting part 11 and be inserted into the recessed parts 2 and 7. Sometimes, a part of the end face of the shutter gets in the way, making it impossible to utilize the features of this type of disk cartridge mentioned above.

[Problem to be solved by the invention]

The present invention eliminates the drawbacks of conventionally proposed disk cartridges, and provides a disk cartridge that has high precision in the lowering position of a recording head or a reproducing head relative to a magnetic disk or optical disk, and is free from the risk of intrusion of dust and the like. The purpose is to

[Means to solve the problem]

In order to achieve the above-mentioned objects, the present invention includes a cartridge case having a head insertion port, a recording disk rotatably housed within the cartridge case, and a recording disk slidably supported outside the cartridge case. The object of the present invention is a disk cartridge equipped with a shutter for opening and closing the head insertion port.

and the shutter is integrally connected to a closing part that blocks the head insertion opening in the closed position of the shutter, and is provided at a portion upstream in the head insertion direction from the head insertion opening in the open position of the shutter. , a narrow head insertion part that is stepped down from the outer surface of the closed part, and an integrally provided end of the head insertion part on the opposite side of the closed part so as to protrude in the vertical width direction of the head insertion part. It is characterized in that it has a rib.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of the disk cartridge with the shutter removed, Fig. 2 is a perspective view of the shutter, Fig. 3 is a cross-sectional view taken along the line E-A in Fig. 2,
Fig. 4 is a plan view of the magnetic disk, Figs. 5 and 6 are a plan view and a front view with the shutter closed (not in use), Fig. 7 is a plan view of the shutter in the middle of opening, and Fig. 6 is a plan view of the magnetic disk. 8 and 9 are a plan view and a front view of the shutter in a fully opened state.

The disk cartridge includes a cartridge case 21, a magnetic disk 22 rotatably housed therein, a cleaning member (not shown) disposed between the cartridge case 21 and the magnetic disk 22, and a shutter. It consists of 23.

The cartridge case 21 is composed of an upper case 25 and a lower case 26 made of a molded body of hard synthetic resin.Both cases 25 and 26 have a drive hole 27 in the center as shown in FIG. A slot-shaped magnetic head insertion opening 28 is provided in each of the slots. Slightly recessed shutter slide portions 29 are formed on the left and right sides of the magnetic head insertion port 28, and a recessed portion 24 is further formed near the magnetic head insertion port 28. This recess 24 is the first
As shown in the figure, it is one step lower than the shutter slide portion 29 and extends from the front side of the cartridge case 21 toward the drive hole 27.

Inside the cartridge case 21, upper case 2
Although not shown, a minute space is formed between the recess 24 of the lower case 26 and the recess 24 of the lower case 26, and a part of the peripheral end of the magnetic disk 22 is inserted between the spaces. , This also restricts the upward and downward movement of the magnetic disk 22 during rotation.

In addition, the hub 33 is arranged so that the peripheral edge of the magnetic disk 22 is always located within the gap between the first coupling recesses 24.
The outer peripheral edge of the hub 33 contacts the inner peripheral edge of the drive hole 27, and the position of the hub 33 is regulated.

The shutter 23 is made of a synthetic resin molded product, and as shown in FIG. 2, it has an upper plate part 30, a lower plate part 31, and a side plate part 32 that connects these end parts.
It consists of , and the side shape is U-shaped.

An opening 33 having approximately the same width as the magnetic head insertion port 28 and a closing portion 34 for closing the magnetic head insertion port 28 are arranged in parallel on the upper and lower plate portions 30 and 31, respectively.

In the vicinity of the opening 33 of the shutter 23, that is, when the shutter 23 is in the open position, a cutout 40 provided on both the upper and lower surfaces is located at the upstream side (front side) of the magnetic head insertion opening 28 in the head insertion direction. As a result, a narrow magnetic head insertion portion 35 that is one step lower than the closing portion 34 is formed.
As shown in the figure, the magnetic head insertion portion 35 has a trapezoidal shape that gradually narrows from the side plate 32 side toward the free ends of the upper and lower plate portions 30 and 31. On the opposite side of the magnetic head insertion part 35 from the closing part 34, ribs 41 are integrally provided which protrude from both the upper and lower surfaces. This rib 41 is, for example, the sixth rib.
As shown in the figure, it is designed not to protrude beyond the surface (upper and lower surfaces) of the cartridge case 21.

When the disk cartridge according to the present invention is inserted into a recording/reproducing apparatus (not shown) with the magnetic head insertion slot 28 (shutter 23) side first, the shutter rotating arm (not shown) provided in the recording/reproducing apparatus can be inserted. The tip of the shutter 23 comes into contact with the shutter 23,
As the disk cartridge is inserted, the shutter rotation arm rotates against the spring elasticity, and the shutter 23, which is in the closed position, gradually slides in a direction perpendicular to the magnetic head insertion opening 28. .

5 and 6 show the state before the shutter 23 slides, and the magnetic head 36 attached to the recording/reproducing apparatus is attached to the shutter 23.
Not above. As the disk cartridge is further inserted into the recording/reproducing apparatus and the shutter 23 slides, the magnetic head 36 moves toward the shutter 2.
Located above 3. The intermediate state of this slide is the seventh
As shown in the figure.

The magnetic head 36 is at a low position to shorten the downward stroke relative to the magnetic disk 22, and as the disk cartridge is inserted, the magnetic head 36
A narrow magnetic head insertion portion 35 is provided which is lowered one step to prevent the tip of the magnetic head 6 from colliding with the shutter 23. As shown in FIG. 8, when the magnetic head 36 reaches the relatively innermost track of the magnetic disk 22, the opening 33 is located above the magnetic head insertion slot 28 and is opened. It's getting old. In order for the magnetic head 36 to pass to the position of the innermost track without any trouble, the magnetic head 36
In relation to the insertion of the magnetic head and the movement of the shutter 23, an inclined portion is formed at one end of the magnetic head insertion portion 35, and in this embodiment, the planar shape of the magnetic head insertion portion 35 is trapezoidal as shown in the figure. It's getting old.

The shutter 23 having such a shape is slidably supported by the shutter slide portion 29 of the cartridge case 21, and is moved as shown in FIG. The magnetic head insertion port 28 is always elastically biased so as to be closed by the closing portion 34.

In this way, the upper and lower plate parts 3 of the shutter 23
Since the magnetic head insertion portion 35 is formed with a step at 0 and 31, the aforementioned diamond-shaped recess 24 is provided to allow the shutter 23 to slide. Therefore, the magnetic head insertion portion 35 moves above the recess 24, and the recess 24 is moved so as to correspond to the inclined portion of the magnetic head insertion portion 35.
is a parallelogram.

FIG. 4 is a plan view of the magnetic disk 22, in which a hub 37 is fixed to the center of the disk, and a recording band 38 of a predetermined width is provided radially outward from the hub 37.
This recording band 38 corresponds to the magnetic head insertion slot 28.

[Effects of the Invention] With the above-described configuration, the present invention has the following effects.

By installing a shutter, it is possible to prevent foreign matter such as dust from entering the cartridge case, and troubles caused by foreign matter entering are eliminated.

Since a narrow head insertion portion is formed in the shutter, the head can be accessed from a low position. Therefore, the stroke of the head relative to the disk is shortened, so that the lowering position accuracy of the head can be maintained at a high level.

Since the head insertion portion is stepped, it cannot be made very thick, and therefore its mechanical strength is weak. However, since this shutter is configured to be moved by a shutter rotation arm against the elasticity of a spring attached to it, the shutter is required to have a certain degree of mechanical strength.

One of the head insertion portions is connected to the closing portion and is thereby reinforced, but if the other head insertion portion is left in a thin state, the required mechanical strength cannot be obtained.

Therefore, in the present invention, by making a rib protrude in the vertical width direction of the head insertion part on the side opposite to the closing part of the head insertion part, the head insertion part is reinforced from both sides by the closing part and the rib. Ensures mechanical strength. As a result, even if a thin head insertion portion is provided, there is no fear of deformation, and the head insertion portion can be used for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic disk cartridge according to an embodiment of the present invention with the shutter removed;
Figure 2 is a perspective view of the shutter, Figure 3 is a perspective view of the shutter.
4 is a plan view of the magnetic disk, 5 and 6 are plan and front views with the shutter closed (when not in use), and 7
The figure is a plan view of the shutter in the middle of being opened.
9 and 9 are a plan view and a front view of the shutter in a fully opened state, FIG. 10 is a perspective view of a previously proposed magnetic disk cartridge, and FIG. 11 is a case body used for the disk cartridge. FIG. 21...Cartridge case, 22...Magnetic disk, 24...Recess, 28...Magnetic head insertion slot, 30...Top plate part, 31...Bottom plate part, 32
. . . Side plate portion, 33 .
……rib.

Claims (1)

[Scope of Claims] 1. A cartridge case having a head insertion opening, a recording disk rotatably housed within the cartridge case, and a recording disk slidably supported outside the cartridge case to accommodate the head insertion opening. In a disc cartridge equipped with a shutter that opens and closes the mouth, the shutter is integrally connected to a closing part that closes the head insertion opening when the shutter is in the closed position, and the head is opened when the shutter is in the open position. A narrow head insertion part is provided upstream of the insertion opening in the head insertion direction and is stepped down from the outer surface of the closed part, and a head insertion part is provided at the end of the head insertion part on the opposite side of the closed part. What is claimed is: 1. A disk cartridge characterized by having a rib integrally provided so as to protrude in the vertical width direction of the disk cartridge. 2. In claim 1, the closing portion is provided on both the upper and lower surfaces, the head insertion portion is formed by providing a cutout on both the upper and lower surfaces, and the rib is formed on both the upper and lower surfaces. A disc cartridge featuring: