JP2550970B2 - Disc cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a shell that rotatably accommodates discs having signal recording portions on both front and back sides, the shutter is slidably mounted, and the shutter is slid to the left and right. The present invention relates to a so-called double-sided disc cassette in which the windows provided on the upper and lower surfaces of the shell are opened and closed.

SUMMARY OF THE INVENTION According to the present invention, a disc having signal recording portions on both front and back surfaces, a disc that is rotatably accommodated, and a window and a shutter guide groove for exposing a part of the disc are provided. In the shell and the shutter guide groove,
It is attached to the shutter mounting part of the shell so as to be slidable in the left-right direction by fitting the guide protrusions provided on both sides, and has a non-notch part for closing the window in the center part, and on both left and right sides thereof. Includes a shutter having a cutout for opening the window, and a shutter spring for setting the non-cutout of the shutter on the window. The notch provided on one side of the non-notch part by sliding in one direction overlaps with the window to open the window, and the magnetic head is introduced from the window to one side surface (front surface side) of the disk. When the signal recorded on the side surface is reproduced and the shell is turned over and inserted into the disc player, the shutter slides in the same direction as the above and the other notch The notch provided on the window overlaps with the window so that the window can be opened and the magnetic head can be introduced from the window to the other side surface (back surface side) of the disk to reproduce the signal recorded on the other side surface. In the disk cassette, the guide protrusions provided on both sides of the shutter come into contact with the central portion of the shutter guide groove, and by providing a stopper that defines the sliding range of the shutter in the left-right direction, The shutter is prevented from oversliding (overrun) so that the cutout portions provided on both sides of the non-cutout portion of the shutter can be accurately overlapped on the window.

[Prior Art] As a disc cassette, as shown in FIG. 6, a disc 1 having signal recording portions on both front and back surfaces, and the disc 1
And a shutter guide groove 3 for rotatably accommodating the disk 1 and exposing a part of the disk 1.
By fitting the shell 4 provided with the guide projections 5 provided on both sides of the shutter guide groove 3 to the shell 4
Is slidably mounted on the shutter mounting portion 4a of the vehicle, has a non-cutout portion 6a for closing the window 2 in the central portion, and cutout portions 6b, 6c for opening the window 2 on both left and right sides thereof. The shutter 6 has a shutter 6 and a shutter spring 7, 7 for setting the non-notched portion 6a of the shutter 6 on the window 2. When the shutter 6 is inserted into a disc player (not shown), the shutter 6 is opened and closed by a shutter opening / closing mechanism. By sliding in one direction, the notch 6b provided on one side of the non-notch 6a overlaps the window 2 to open the window 2, and from this window 2 a magnetic head (not shown) is attached to one side of the disk 1 ( The signal recorded on the one side surface is reproduced, and when the shell 4 is turned upside down and inserted into the disc player, the shutter 6 slides in the same direction as described above and the other non-notched portion 6a. Provided on the side The notch 6c overlaps the window 2 to open the window 2, and the magnetic head is introduced from the window 2 to the other side surface side (back surface side) of the disk 1 to reproduce the signal recorded on the other side surface side. A so-called double-sided disk cassette that can be used has been developed.

[Problems to be Solved by the Invention] In the conventional disc cassette described above, when the shutter 6 is slid left and right,
Overslide (overrun) and cutouts 6b, 6c
There is a problem that the position of does not completely overlap with the window 2 and it may be difficult to insert the magnetic head.

The present invention has been made for the purpose of solving the above conventional problems.

[Means for Solving the Problems] A stopper is provided at the center of the shutter guide groove, and one end and the other end of the stopper in the shutter slide direction are guide projection contact portions, respectively. By sliding in one direction, the guide protrusion provided on one side of the shutter abuts the one guide protrusion abutting portion, and one notch portion of the shutter stops in a state of overlapping on the window, When the shutter is slid in the other direction, the guide projection provided on the other side of the shutter comes into contact with the other guide projection abutting portion, and the other cutout portion of the shutter stops in a state of being overlapped on the window. I did it.

[Operation] When the shutter is slid in one direction, the guide projection provided on one side of the shutter comes into contact with the stopper to prevent the shutter from further sliding. Further, when the shell is turned over and the shutter is slid in the same direction as described above, the guide projection provided on the other side of the shutter abuts the stopper and prevents the shutter from further sliding.
Therefore, if a notch is provided in the overlapping position on the window under the condition that the shutter is prevented from sliding in the left-right direction, when the shutter is slid to the left and right to the maximum extent,
These notches will always be located on the window.

[Embodiment] Next, an embodiment of the disc cassette of the present invention will be described with reference to FIGS.

Reference numeral 11 is a disc cassette of the present invention. The disc cassette 11 is a disc 1 having signal recording portions 12a on both front and back surfaces.
2, and the disk 12 is rotatably accommodated,
A shell 15 provided with a window 13 for exposing a part of the disk 12 and a shutter guide groove 14 and a guide projection 16 provided on both sides of the shutter guide groove 14 are fitted to the shell of the shutter of the shell 15. It is attached to the mounting portion 15a so as to be slidable in the left-right direction, has a non-cutout portion 17a for closing the window 13 in the central portion, and cutout portions 17b for opening the window 13 on both left and right sides thereof, A shutter 17 having a shutter 17c and shutter springs 18 and 1 in which a non-cutout portion 17a of the shutter 17 is set on the window 13.
8 and a stopper 19 is provided at the center of the shutter guide groove 14.

The disk 12 is formed of a polymer material in a flexible disc shape. A signal recording portion 12a is provided on both front and back surfaces, a center hub receiving hole 12b is provided in the center portion, and a center hub 20 is attached to the center hub receiving hole 12b.

The shell 15 is made of a hard polymer material and has an upper shell 15 provided with a window 13 and a shutter guide groove 14.
It is formed by being divided into b and the lower shell 15c. The window 13 is the shutter guide groove 1 of the upper and lower shells 15b and 15c.
The shutter guide groove 14 is formed at a substantially central portion in the shutter sliding direction on the 4 side, and the shutter guide groove 14 has a small diameter groove portion 14a and a large diameter groove portion 14 continuous with the small diameter groove portion 14a as shown in FIG.
b, and these small-diameter groove portion 14a and large-diameter groove portion 14b
The upper and lower shells 15b and 15c are formed by providing shutter stopper ribs 15d on the one end side facing portions. 15e
Is a hub receiving hole formed in the central portion of the upper and lower shells 15b and 15c, and 21 and 21 are liners attached to the inner surfaces of the upper and lower shells 15b and 15c to prevent wear of the disk 12 and generation of static electricity. The liner 21, 21 sandwiches the disk 12 and the ridges 15 provided on the peripheral edges of the upper shell 15b and the lower shell 15c.
The shell 15 is formed by superimposing f (the projections 15f are formed to be thicker than the shutter removal rib 15d) and welding them together.

Further, the shutter 17 is made of a polymer material having a small wear coefficient and excellent wear resistance, and has an end face plate 17d and a pair of opposed plates 17e and 17f which are continuously provided at both ends of the end face plate 17d. It is formed in a letter shape, a non-cutout portion 17a is provided in the central portion of the facing plates 17e, 17f, and the cutout portions 17b, 1 are provided on both sides thereof.
7c is provided.

The guide protrusions 16 and 16 are integrally formed on both sides of the inner surface of the end face plate 17d. These guide protrusions
16, 16 are small-diameter shaft portion 16a and large-diameter shaft portion as shown in FIG.
16b, and the small-diameter shaft portion 16a is the small-diameter guide groove.
The large-diameter shaft portion 16b is fitted in the large-diameter guide groove 14b so as to prevent the shutter 17 from coming off. .

A so-called torsion coil spring is used as the shutter spring 18, and is attached to the spring accommodating portions 22, 22 provided on both sides of the shell 15. One end side 18a of these shutter springs 18 is in contact with the inner surface of the spring accommodating portion 22, and the other end side (free end side) 18b is a spring locking portion 23 provided at the end portion of the guide protrusion 16. The shutter 17 presses both ends of the shutter 17 substantially evenly by the spring force of the non-notched portion 17 at the center of the shutter 17.
a is positioned on the window 13, and when the shutter 17 is slid to the left or right against the spring force of these shutter springs 18, 18, the shutter 17 is provided with guide projections 16, 16 on both sides. The notches 17b and 17c are positioned on the window 13 by sliding until the 16 contacts the stopper 19.

Further, the stopper 19 is formed in a state where the central portion of the small diameter groove portion 14a is closed by providing a convex portion having substantially the same thickness in the central portion of the shutter retaining rib 15d of both the upper and lower shells 15b and 15c, As shown in FIG. 1, when the shutter 17 is located substantially in the center of the shutter mounting portion 15a, the shutter 17 is slid to the left in the drawing, and when the cutout portion 17b is located on the window 13, one guide projection 16 is Along with the left end of the stopper 19 to prevent the shutter 17 from overrunning, the shell 15 is turned over and the shutter 17 is slid to the right in the drawing in the same manner as described above, so that the notch 17c is located on the window 13. When positioned, the other guide protrusion 16 contacts the right end of the stopper 19 to prevent overrun of the shutter 17.

Since the disc cassette 11 of the embodiment has the above-described configuration, the shutter 17 is in a state in which the window 13 is closed at the non-notched portion 17a by the spring force of the shutter springs 18 and 18 unless a special external force is applied to the shutter 17. Is set to. Then, if the shutter 17 is slid in this direction in one direction until one guide protrusion 16 contacts the stopper 19, the cutout portion 17b provided on one side of the non-cutout portion 17a is overlapped on the window 13 and the shutter 17 is formed. If the window 13 is opened, the shell 15 is turned over, and the shutter 17 is slid in the same direction as the front until the other guide protrusion 16 comes into contact with the stopper 19, the cutout portion provided on the other side of the non-cutout portion 17a. 17c overlaps the window 13 and opens the window 13.

FIG. 5 shows another embodiment of the stopper 19, in which the stopper 19 is provided with a convex portion only at the center of the shutter stopper rib 15d of either the upper shell 15b or the lower shell 15c. It is formed and the stopper 19
On both side surfaces of the guide projection receiving recesses 19a, 19b are formed,
By receiving the guide protrusion 16 that has slid in these recesses 19a and 19b, when the guide protrusion 16 contacts the stopper 19, a force in the separating direction is not applied to the upper shell 15b and the lower shell 15c. The case is shown.

[Advantages of the Invention] As described above, according to the present invention, since the guide protrusions provided on both sides of the shutter are in contact with the central portion of the shutter guide groove, the stopper that defines the sliding range of the shutter is provided. In the so-called double-sided disc cassette,
There is an effect that the overrun of the shutter can be prevented and the window can be opened and closed with certainty.

[Brief description of drawings]

1 is a perspective view showing a disc cassette of the present invention in a state where a shell and a shutter are separated, FIG. 2 is an exploded perspective view of the disc cassette, and FIG. 3 is a state in which a guide projection is fitted in a shutter guide groove. Sectional view, Figure 4 is a sectional view of the main part,
FIG. 5 is a sectional view of the essential part of another embodiment, and FIG. 6 is a perspective view of a conventional example. 11 …… disc cassette, 12 …… disc, 13 …… window, 14 …… shutter guide groove, 15 …… shell, 16 ……
Guide protrusion, 17 ... Shutter, 17a ... Non-notch portion, 17b, 1
7c …… Notch, 18 …… Shutter spring, 19 …… Stopper.

Claims (1)

(57) [Claims] 1. A disk having signal recording portions on both front and back surfaces, a shell rotatably accommodating the disk, and a shell provided with a window and a shutter guide groove for exposing a part of the disk, In the shutter guide groove,
It is attached to the shutter mounting part of the shell so as to be slidable in the left-right direction by fitting the guide protrusions provided on both sides, and has a non-notch part for closing the window in the center part, and on both left and right sides thereof. Includes a shutter having a cutout portion for opening the window and a shutter spring for setting a non-cutout portion of the shutter on the window, and a stopper is provided at a central portion of the shutter guide groove. At the same time, one end and the other end of the stopper in the shutter slide direction are guide projection contact portions, and when the shutter is slid in one direction, the guide projection provided on one side of the shutter is Of the shutter is stopped in a state where one of the notches of the shutter overlaps the window, and the shutter is slid in the other direction. Then, the guide projection provided on the other side of the shutter abuts the guide projection abutting portion of the other shutter, and the other cutout portion of the shutter is stopped in a state of overlapping on the window. And a disc cassette.