JP2615591B2 - Disk cassette - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cassette having a shutter for opening and closing a head insertion hole, and more particularly to facilitating assembly of a torsion spring for biasing the shutter. .

[Summary of the Invention] According to the present invention, a shutter is slidably mounted on a case, and a torsion spring is disposed in a spring accommodating portion of the case.
An opening for inserting the other tip of the torsion spring near a corner on the front end side of the case, wherein the torsion spring biases the shutter to a position to close the head insertion hole; And a spring holding portion for holding the other end of the torsion spring inserted from the opening, and the opening and the opening in the direction from the front end surface of the case to the rear end surface of the case. By displacing the torsion spring so that it does not coincide with the spring holding portion, the torsion spring can be easily assembled, and even if an impact is applied to the case, the other end of the torsion spring can be used. It is possible to prevent the part from falling off from the spring holding part.

[Prior Art] As a disk cassette, a shutter is slidably mounted on a case, a torsion spring is disposed in a spring accommodating portion of the case, and the torsion spring biases the shutter to a position for closing the head insertion hole. Are known (for example, JP-A-58-203680).

In the disk cassette, one end of the torsion spring is locked by a spring locking portion provided on the shutter side, and the other end is formed from an opening provided near a corner on the front end side of the case. It is inserted and held by a spring holding portion (locking portion).

[Problems to be Solved by the Invention] In the conventional disk cassette, since the opening and the spring holding portion are arranged in the same direction as the opening and closing operation of the shutter, the disk cassette may be accidentally dropped. Therefore, when an impact is applied to the torsion spring, the other end of the torsion spring held in the spring holding portion easily comes out of the opening, and the torsion spring falls off the case. There was a point. The present invention has been made to solve the above-mentioned conventional problems.

[Means for Solving the Problems] The present invention provides a case having a head insertion hole for accommodating a disk rotatably and exposing the disk, and a slidably mounted parallel to a front end face of the case, A shutter for opening and closing the head insertion hole, and a spring insertion hole provided in a front end surface of the case, inserted into a spring storage portion in the case, and one end portion of the shutter insertion portion provided in the shutter. A torsion spring that is locked, the other end of which is held by the case, and presses the shutter in a direction to close the head insertion hole; and a torsion spring provided near a corner of a front end surface of the case, An opening into which the other end is inserted, and a spring holding portion provided in the case and holding the other end of the torsion spring inserted through the opening. In the disk cassette having, the opening is formed at one end of the spring insertion hole in a direction substantially perpendicular to the spring insertion hole, and in a direction from a front end surface of the case to a rear end surface of the case, The opening and the spring holding part were arranged so as to be shifted from each other so as not to coincide with each other.

[Operation] The torsion spring is inserted into the spring accommodating portion from the spring insertion opening of the case, one end is locked to the shutter, and the other end is inserted into the opening. When the shutter is moved in the closing direction, the other end of the torsion spring receives an external force from the shutter, moves in a direction perpendicular to the direction in which the shutter opens and closes, and enters the spring holding portion. Is held.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 6, a disk cassette 1 has a magnetic disk 2 as a disk having a signal recording surface, a case in which the magnetic disk 2 is rotatably housed, and a head insertion hole 3a is formed in upper and lower surfaces. 3 and a shutter 4 which is slidably mounted on the case 3 and has a cutout 4a and a non-cutout 4b for opening and closing the head insertion hole 3a.
And the non-notched portion 4b of the shutter 4 is inserted into the head insertion hole 3a.
And a torsion spring 5 for urging the shutter 4 so that the shutter 4 is superimposed.

The magnetic disk 2 is formed in a disk shape from a flexible polymer material. And on both sides,
A magnetic recording surface is provided, and a center hub receiving hole 2a is formed in the center. A pair of center hubs 6, 6 are attached to the center hub receiving hole 2a.

The case 3 is divided into an upper shell 3b having the head insertion hole 3a and a lower shell 3c. The upper shell 3b and the lower shell 3c are formed of a hard polymer material, and a hub receiving hole 3d for exposing the center hub 6 is formed at the center of each of the shells 3b and 3c. I have. In addition, each shell 3b, 3c
A liner (non-woven fabric) that prevents wear of the magnetic disk 2 and generation of static electricity and functions as a cleaning material
7 is installed. Then, the magnetic disk 2 is rotatably and lightly sandwiched between the liners 7, 7, and the side walls 3e, 3f projecting from the peripheral edges of the upper shell 3b and the lower shell 3c are overlapped with each other and are welded at several places. Thus, the case 3 is configured. An elongated sliding guide groove 9 also serving as a spring insertion hole is formed on the end face of the case 3 on the side of the head insertion hole 3a, and the sliding guide projection 8 of the shutter 4 is inserted into the sliding guide groove 9. Projections 3g, 3h are provided at both ends of the sliding guide groove 9 of the case 3, and the projections 3g, 3h
Regulates the sliding range of the shutter 4.

The shutter 4 is formed in a U-shaped cross section by a case front end overlapping piece 4c and a pair of shutter plate portions 4d and 4e provided continuously at both ends of the case front end overlapping piece 4c. At the center of the pair of shutter plate portions 4d, 4e, a non-cut portion 4b is formed, and at both ends thereof, cut portions 4a, 4a are formed. The case front end overlapping piece 4c and the pair of shutter plates 4d and 4e are integrally formed of a polymer material having a small friction coefficient and excellent wear resistance. Then, when inserted into one end of the case 3 from between the pair of shutter plates facing the case front end overlapping piece 4c, one end surface of the case 3 overlaps the case front end overlapping piece 4c, and the upper shell 3b and the lower shell
3c is sandwiched between shutter plates 4d and 4e.

A sliding guide projection 8 is provided inside the overlapping piece 4c at the front end of the case of the shutter 4, and
When one end of the shutter 3 is inserted, the shutter 4 is fitted to the slide guide groove 9 provided in the case 3 so that the shutter 4 can be slidably mounted on the case 3. Further, a spring locking portion 4f is continuously provided on one side surface of the slide guide projection 8.

Further, torsion springs 5 are accommodated in spring accommodating portions 12 provided on both sides of the case 3. The center of the torsion spring 5 is formed in a coil-shaped portion 5a by a linear spring material, and the tip portions 5b and 5c on both sides thereof are bent at substantially right angles in alternate directions. One end (free end side) of the torsion spring 5 housed in the spring housing 12
Reference numeral 5b is engaged with the spring locking portion 4f to resiliently spring the spring locking portion 4f. The other (fixed end side) tip 5c of the torsion spring 5 is inserted through an opening 15a provided in a direction substantially perpendicular to the spring insertion hole, and is held by the spring holding portion 14. The opening 15a and the spring holding portion 14 are arranged so as to be shifted from each other in the direction from the front end face of the case 3 to the rear end face of the case 3 so that their positions do not coincide. The two torsion springs 5 set the shutter 4 at the center of the case 3, close the head insertion hole 3 a with the non-cut portion 4 b of the shutter 4, and reduce the spring force of the torsion spring 5. In contrast, when the shutter 4 is slid left and right, the notch portions 4a provided on both sides of the non-notch portion 4b overlap the head insertion hole 3a to open the head insertion hole 3a.

The spring accommodating portion 12 is formed as a substantially trapezoidal hollow portion at both right and left corners of each of the shells 3b and 3c with a rib 10.
The upper part of each spring accommodating part 12 is provided with a torsion spring 5.
Guide grooves 11, 11 for accommodating and moving the tip of one (free end side) tip 5b are formed. Also,
A spring holding portion 14 communicating with the guide grooves 11, 11 is provided on the case 3 end side of the guide grooves 11, 11. The spring holding portion 14 is formed one step deeper than the guide groove 11, and the spring holding portion 14 is provided with a spring insertion guide groove other than the guide groove 11.
Also communicates with 15.

The spring insertion guide groove 15 is formed by the protrusions 3g and 3h of the case 3.
The main portion is provided on the opposite side of the spring accommodating portion 12 with respect to the slide guide groove 9 also serving as a spring insertion hole.
The spring insertion guide groove 15 has openings 15a on the opposing surfaces of both the projections 3g and 3h, and is formed in a shape that prevents the torsion spring 5 from moving in the direction opposite to the insertion direction.

According to the disk cassette 1, the shutter 4 is pressed at both ends by the spring force of the torsion spring 5, is set at the center of the case 3, and the non-cutout portion 4b closes the head insertion hole 3a. When the shutter 4 is slid in one direction against the spring force of the torsion spring 5 from this state, the notch 4a formed on one side of the non-notch 4b overlaps the head insertion hole 3a. Then, open the head insertion hole 3a,
If the shutter 4 is slid in the other direction, the notch 4b
The notch 4a formed on the other side overlaps the head insertion hole 3a to open the head insertion hole 3a.

In order to mount the disk cassette 1, the magnetic disk 2 to which the center hubs 6, 6 are attached is attached to the upper shell 3b.
And the upper shell 3b and the lower shell 3c are welded together and fixed. The shutter 4 is inserted into one end of the case 3 from between a pair of shutter plates facing the front end overlapping piece 4c of the case, and is inserted until the slide guide projection 8 is fitted into the slide guide groove 9. The torsion spring 5 is gripped by narrowing the gap between both ends 5b and 5c, and is inserted into the sliding guide groove 9 of the case 3 from the coiled portion 5a. As shown in FIG. 4, one end 5b of the torsion spring 5 is engaged with the spring engagement portion 4f of the shutter 4, and the other end 5c is inserted into the spring insertion guide groove 15 from the opening 15a. . Since the opening 15a of the spring insertion guide groove 15 is located before the slide guide groove 9, the operator can easily and easily insert the other end 5c of the torsion spring 5. next,
The shutter moves in the direction of the opening position against the spring force of the torsion spring. Then, the torsion spring 5 initially receives an external force to move in the anti-insertion direction, but is stopped by the wall surface of the spring insertion guide groove 15. However, when the movement of the shutter 4 further proceeds, as shown in FIGS. 5 and 6, the torsion spring 5 receives an external force to move in the insertion direction in the opposite direction to the above, and the other end 5c becomes the spring insertion guide groove. The sliding surface 15 slides into the spring holding portion 14. Then, when the other torsion springs 5 are mounted in the same manner as described above, the operation is completed.

In FIG. 7, another embodiment is shown. Only the configuration of the spring holding portion 14 is different from that of the above embodiment, and the other configuration is the same. . That is, the projecting wall 16 is provided between the spring holding portion 14 of this embodiment and the spring insertion guide groove 15. This configuration is preferable because the other end 5c of the torsion spring 5 does not vibrate due to impact or the like.

[Effects of the Invention] As described above, the present invention provides an opening into which the other end of the torsion spring is inserted, and a spring holding the other end of the torsion spring inserted through this opening. In the disk cassette having the portion, the opening is provided in a direction substantially perpendicular to the spring insertion hole, so that the other end of the torsion spring can be easily inserted. In addition, since the opening and the spring holding portion are displaced in a direction from the front end face toward the rear end face of the case, the other end of the torsion spring is kept in contact with the opening even if a shock is applied to the disk cassette. From falling out of the torsion spring can be prevented. Further, since the torsion spring is less likely to fall off, a deeper spring holding portion is required as in the related art, and the spring holding portion can be made thinner and smaller.

[Brief description of the drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is an exploded perspective view of a disk cassette, FIG. 2 is a perspective view of the disk cassette, FIG. 3 is a partially cutaway perspective view of the disk cassette, 4 to 6 are views for explaining the operation when a torsion spring is mounted, FIG. 7 is a partial sectional view of a disk cassette showing another embodiment, and FIG. 8 is a part of a disk cassette showing a conventional example. It is sectional drawing. DESCRIPTION OF SYMBOLS 1 ... Disk cassette, 2 ... Magnetic disk (disk), 3 ... Case, 3a ... Head insertion hole, 4 ... Shutter, 4f ... Spring locking part, 5 ... Torsion spring, 5b
… One end, 5c… The other end, 9… Sliding guide groove (spring insertion port), 12… Spring accommodation part, 14… Spring holding part, 15… Spring insertion guide groove, 15a ... Opening.

Claims (1)

(57) [Claims] 1. A case having a head insertion hole for accommodating a disk rotatably and exposing the disk, and a slidably mounted parallel to a front end face of the case,
A shutter for opening and closing the head insertion hole, and a spring insertion hole provided on a front end surface of the case, inserted into a spring storage portion in the case, and one end portion provided with a spring engagement portion provided on the shutter. A torsion spring that is locked and the other end of which is held by the case and presses the shutter in a direction to close the head insertion hole, wherein the torsion spring is provided near a corner of a front end surface of the case. An opening into which the other end of the torsion spring is inserted, and a spring holding portion provided in the case and holding the other end of the torsion spring inserted through the opening. The opening is formed at one end of the spring insertion hole in a direction substantially perpendicular to the spring insertion hole, and is provided at a rear end of the case from a front end surface of the case. In the direction toward the surface, the disc cassette, characterized in that said opening and said spring holding portion are staggered so as not to coincide.