JPH0454609Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a disk cassette in which the shape of the movement groove on the inner wall surface of the case is improved, in which the tip of the set spring for disposing the shutter in the set position moves.

[Summary of the invention] This invention includes a case that rotatably houses a disk and has a head insertion hole that exposes the disk, and a shutter that is slidably attached to the case and opens and closes the head insertion hole. , which is provided in the case, and is arranged so that its tip bent at a substantially right angle moves along movement grooves formed in both inner wall surfaces facing each other with a predetermined clearance in the case. , a set spring for locating the shutter in the set position, wherein the groove width of the movement groove on the one inner wall surface on the distal end side of the movable distal end portion of the set spring is set to the base end of the distal end portion. By forming the movable groove on the other inner wall surface on the side (bending base side) wider than the groove width, even if the distal end of the movable side of the set spring is not sufficiently bent at a substantially right angle, This prevents the inner wall surface of the case from being scraped by the sharp tip due to burrs or the like on the tip, so that the shutter can always be moved smoothly.

[Prior Art] A disk cassette 20 as shown in FIGS. 7 to 9
It has been known. This disk cassette 20 is
A case 22 includes a disk 21 having a signal recording surface and a case 22 that rotatably houses the disk 21 and has head insertion holes 22a formed on the upper and lower surfaces.
A shutter 23 is slidably attached to the hollow outer side of the upper part of the case 22 and has a notch 23a and a non-cutout part 23b for opening and closing the head insertion hole 22a, and a non-cutout part 23b of the shutter 23.
The set spring 24 is positioned above the head insertion hole 23a. Therefore, both ends 24a, 24b of this set spring 24
are bent at substantially right angles in alternate directions, and one tip 24b is engaged with the spring locking portion 23c of the shutter 23. Then, slide this shutter 23 and set the set spring 24.
The movable side tip 24b is connected to the fixed side tip 24a.
When the head is moved to the side, the notch 23b is positioned above the head insertion hole 22a, and the head insertion hole 22a is opened.

[Problems to be solved by the invention] However, in the conventional disk cassette 20, as shown in FIG.
The sharp tip of the tip 24b on the movable side of the set spring 4 slides in contact with the inner wall surface of the moving groove 22b of the case 22, and the length accuracy of the tip 24b of the set spring 4 is not uniform and varies. Since the sliding resistance may become very large, the inner wall surface of the moving groove 22b of the case 22 is scraped by the tip of the movable side tip 24b of the set spring 24, and the shavings are removed. There was a drawback that the shutter 23 could not move smoothly due to clogging or the like, which could lead to malfunctions.

Therefore, this invention provides a disk cassette in which the shutter can be moved smoothly at all times.

[Means for Solving the Problems] The disk cassette of this invention includes a case that rotatably accommodates a disk and has a head insertion hole for exposing the disk, and a case that is slidably attached to the case and has the head inserted therein. A shutter for opening and closing the insertion hole is provided in the case, and its distal end portion bent at a substantially right angle follows movement grooves formed on both inner wall surfaces facing each other with a predetermined clearance in the case. In the disk cassette, a set spring is arranged to move the shutter to a set position, and the groove width of the movement groove on the one inner wall surface on the distal end side of the movable end of the set spring is , is formed wider than the groove width of the movement groove on the other inner wall surface on the base end side of the distal end portion.

[Operation] When the shutter moves, the tip of the movable end of the set spring moves along the wide movement groove formed on one inner wall surface of the case without contacting the inner wall surface of the movement groove. . This prevents the movable end of the set spring from scraping the inner wall surface of the case.

[Example] Hereinafter, an example of this invention will be described in detail with reference to the drawings.

In FIGS. 1 to 6, reference numeral 1 indicates a disk cassette. This disk cassette 1 includes a disk 2 having a signal recording surface, a case 3 which rotatably accommodates the disk 2, and has head insertion holes 3a formed on the upper and lower surfaces, and an upper center outer side of the case 3. A cutout portion 4a and a non-cutout portion 4 are slidably attached to the head insertion hole 3a and open and close the head insertion hole 3a.
The shutter 4 is provided with a shutter 4 having a shape 4b formed therein, and a set spring 5 that biases the shutter 4 so that the non-notched portion 4b of the shutter 4 is positioned above the head insertion hole 3a.

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

Further, the case 3 is divided into an upper shell 10 in which the head insertion hole 3a is formed and a lower shell 11. These upper shell 10 and lower shell 11 are formed of a hard polymer material, and each shell 10, 11 has a hub receiving hole 10a in the center for exposing the center hub 6. 11a are formed respectively. Further, felts 7, 7 are attached to the inner wall surfaces of each shell 10, 11 to prevent wear of the disk 2 and generation of static electricity. Then, the disk 2 is sandwiched between these felts 7, 7, and the left and right side walls 10b, 11b, etc. formed protruding from the periphery of the upper shell 10 and the lower shell 11 are overlapped with each other,
The case 3 is constructed by welding the two together.

Further, the shutter 4 has a case end face overlapping piece 4c.
and a pair of case clamping pieces 4d and 4e connected to both ends of the case end face overlapping piece 4c, forming a U-shaped cross section. This pair of case clamping pieces 4
A non-notched portion 4b is formed at the center of d and 4e, and notched portions 4a and 4b are formed at both ends thereof. These case end face overlapping pieces 4c and the pair of case clamping pieces 4d and 4e have a small coefficient of friction.
It is integrally molded from a polymer material with excellent wear resistance. Then, one end of the case 3 is inserted through the opening opposite to the case end face overlapping piece 4c, and the sliding guide protrusion 9 provided on the inner surface of the shutter 4 is fitted into the sliding guide groove 8 formed in the case 3. By fitting the shutter 4 together, the shutter 4 is slidably attached to the shutter sliding surface 3b of the case 3, and when the shutter 4 is positioned at the center of the shutter sliding surface 3b, the non-notched portion 4b is inserted into the head insertion hole 3a. It's starting to block the area.

Further, as shown in FIG. 4, the set spring 5 is made of a linear spring material, and its center is formed into a coiled part 5a, and the tip parts 5d, 5e of the both side arm parts 5c, 5c are arranged in alternate directions. It is bent approximately at right angles to the direction. And this set spring 5
are respectively arranged in set spring accommodating portions 12 and 12 formed between the upper shell 10 and the lower shell 11 on both sides of the upper part of the case 3, respectively.

Each of the set spring accommodating portions 12 is provided at both corners of the left and right side walls 10b, 11b of each shell 10, 11.
a first convex strip 12a formed parallel to C with a predetermined interval, and upper side walls 10d, 11d.
A second protruding strip 12b is formed parallel to the second protruding strip 12b with a predetermined interval, and a predetermined inclination angle (in the case of this embodiment) is formed from the tip of the second protruding strip 12b.
130°) and extends toward the upper side walls 10b, 11d.
2c, and each of these protrusions 12a, 12b, 12c
and an inner wall surface 1 surrounded by upper side walls 10b and 11d.
0e and 11e form a substantially trapezoidal central portion. In addition, the upper side wall 10 of each set spring accommodating portion 12, that is, the upper side wall 10 in the direction of each shell 10, 11
Inner wall surfaces 10e and 11e on the sides b and 11d are respectively formed with movement grooves 10f and 11f for accommodating and moving the ends of both end portions 5d and 5e of the set spring 5. As shown in FIG. 6, the groove width of the moving groove 11f on the distal end side of the distal end portion 5d on the movable side of the set spring 5 is
The width of the moving groove 10f on the base end side (bending base side) is wider than the width of the moving groove 10f in the upper direction in the figure. As a result, even if the tip portion 5d on the movable side of the set spring 5 is not sufficiently bent at 90 degrees, the sharp tip of the tip portion 5d can be inserted into the movement groove on the upper side wall 11d side of the set spring accommodating portion 12. 11f, or the moving groove 11f.
It is designed to prevent the sides and bottom of the product from being scraped off.

When the set spring 5 is fitted into the set spring accommodating portion 12 with the tip portions 5d and 5e on both sides facing toward the upper side walls 10d and 11d, the set spring 5 is fixed to the tip portion 5d on the movable side. The side tip portion 5e is the upper side wall 10d, 1
The set spring 5 is attached to the set spring accommodating portion 12 with the coiled portion 5a of the set spring 5 in contact with the inner surface of the third convex portion 12c. Further, the movable end portion 5d of the set spring 5 engages with a spring engaging portion 4f formed at the end of the shutter 4, and the spring force causes the shutter 4 to be closed.
Press from both ends. Thereby, the shutter 4 is positioned at the center of the shutter sliding surface 3b of the case 3, and the non-notched portion 4b at the center of the shutter 4 is set over the head insertion hole 3a.

Reference numerals 12 indicate wedge-shaped positioning recesses formed on the vertical inner surfaces of the upper side walls 10d and 11d, and when the set spring 5 is expanded, the shutter 4 is positioned at the center of the shutter sliding surface 3b of the case 3. When the set spring 5 and the shutter 4 are positioned, the movable end portion 5b is fitted, thereby positioning the set spring 5 and the shutter 4.

According to the disk cassette 1 of the above embodiment, unless a special external force is applied to the shutter 4, both ends of the shutter 4 are pressed by the spring force of the set spring 5, and the shutter 4 is pushed to the center of the shutter sliding surface 3b of the case 3. The head insertion hole 3a is set in the non-notched portion 4b.
becomes closed. From this state, if the shutter 4 is slid in one direction against the spring force of the set spring 5, the notch 4a formed on one side of the non-notched part 4b will overlap the head insertion hole 3a. Then, when the head insertion hole 3a is opened and the shutter 4 is slid in the other direction, the notch 4a provided on the other side of the non-notched portion 4b overlaps the head insertion hole 3a, allowing the head to be inserted. Open hole 3a. At this time, the inner wall surface 1 of the set spring accommodating portion 12 facing the movable end portion 5d of the set spring 5 is
The groove width of the moving groove 11f formed in 1e is the same as that of the moving groove 10 on the base end side (bending base side) of the distal end portion 5d.
The groove width of the set spring 5 is wider than the width of the groove f by the dimension H, and the tip portion 5d is formed wider upwardly so as to prevent the tip portion of the tip portion 5d from coming into contact with the side and bottom surfaces of the movable groove 11f. Tip part 5d
Even if the 90-degree bending formation is insufficient, the sharp end of the distal end portion 5d may catch on the side and bottom surfaces of the moving groove 11f on the upper side wall 11d side of the set spring accommodating portion 12, and the moving groove may be damaged. It is possible to prevent the sides and bottom of the shutter 4 from being scratched.
can be moved smoothly at all times.

[Effects of the invention] As described above, according to this invention, the movable tip is provided in the case and is arranged to move along the movement grooves formed on both inner wall surfaces of the case. In a disk cassette having a set spring that places the shutter in the set position, the groove width of the movement groove on the one inner wall surface on the distal end side of the movable distal end of the set spring is set to Since the groove width is wider than the groove width of the moving groove on the other inner wall surface of the set spring, even if the tip of the movable side of the set spring is not sufficiently bent,
The sharp tip portion of the tip does not come into contact with the one inner wall surface. Thereby, it is possible to prevent the tip of the movable end of the set spring from scraping the inner wall surface of one side of the case, and the shutter can always be smoothly reciprocated, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a disk cassette showing an embodiment of this invention, Fig. 2 is a perspective view of the same disk cassette, Fig. 3 is a partially cutaway perspective view of the same disk cassette, and Fig. 4 is a set spring. Perspective view,
Figure 5 is a partially cutaway plan view of the disk cassette.
Fig. 6 is a partial sectional view of the disc cassette showing the installation state of the set spring, Fig. 7 is a plan view of the conventional disc cassette, Fig. 8 is a bottom view of the disc cassette, and Fig. 9 is the conventional disc cassette. FIG. 3 is a partial plan view of the disk cassette showing the state in which the set spring is attached. 1...Disk cassette, 2...Disk, 3
...Case, 3a...Head insertion hole, 4...Shutter, 5...Set spring, 5d...Movable side tip, 5e...Fixed side tip, 10e...
Other inner wall surface, 11e...One inner wall surface, 10
f, 11f...Movement groove.

Claims (1)

[Scope of utility model registration request] a case that rotatably accommodates a disk and has a head insertion hole that exposes the disk; a shutter that is slidably attached to the case and opens and closes the head insertion hole; A set in which the tip portion bent at a right angle is arranged to move along movement grooves formed on both inner wall surfaces facing each other with a predetermined clearance in the case, and the shutter is placed at a set position. In the disc cassette having a spring, the groove width of the movement groove on the one inner wall surface on the distal end side of the movable distal end portion of the set spring is equal to the width of the movement groove on the other inner wall surface on the proximal end side of the distal end portion. A disk cassette characterized by being formed wider than the groove width of the disk cassette.