JPH0516701Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a disk cassette in which the shape of the inner wall surface of the case on which the distal end of the movable end of the set spring that places the shutter in the set position is moved has been improved.

[Summary of the invention] This invention includes 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. The shutter is disposed in such a manner that its distal end, which is provided in the case and is bent at a substantially right angle, moves along movement grooves formed on inner wall surfaces of the case that face each other with a predetermined clearance therebetween. In a disk cassette having a set spring disposed at the set position, a pair of set spring accommodating portions are provided on both sides in the case, a set spring is accommodated in each of the pair of set spring accommodating portions, and each of the set springs is The movable end side distal end portions are respectively engaged with a pair of spring engaging portions protruding on both sides of the shutter, and the shutter is in a closed state in the vicinity of the movable end side distal end portions of each of the set springs. By connecting and forming recesses for accommodating the distal ends of the movable end side of each set spring in the movement grooves of the inner wall surface at the positions, the movable end side of each set spring can be easily moved when the disk cassette falls. The distal ends of the set springs are accommodated in the respective recesses so that the distal ends of the movable ends of the set springs do not bite into the inner wall surface of the case, and the distal ends of the distal ends of the movable ends of the set springs are accommodated in the inner wall surface of the case. This prevents the movable end of each set spring from digging into the spring and preventing it from returning to its original position, and allows the movable end of each set spring to always move smoothly.

[Prior Art] A disk cassette 20 as shown in FIGS. 7 to 9
It has been known. This disk cassette 20 is
A magnetic disk 21 as a disk having a signal recording surface, rotatably housing the magnetic disk 21, and head insertion holes 22a on the upper and lower surfaces.
A shutter 23 that is slidably attached to the case 22 and has a notch 23a and a non-notch 23b for opening and closing the head insertion hole 22a, and a non-notch 23b of the shutter 23. It has a set spring 24 which is positioned above the head insertion hole 22a. Therefore, both tips 24a, 24 of this set spring 24
b are bent approximately at right angles in alternate directions, and the tip portion 24b on one movable end side is connected to the shutter 2.
It is engaged with the spring engaging portion 23c of No.3.

When the shutter 23 is slid to move the movable end tip 24b of the set spring 24 toward the fixed end tip 24a, the notch 23b overlaps the head insertion hole 22a, allowing the head to be inserted. The hole 22a is in an open state.

[Problems to be Solved by the Invention] However, in the conventional disk cassette 20, when a special external force is applied to the shutter, such as when the disk cassette falls, the distal end 24b on the movable end side of the set spring 24 closes to the shutter 23. The set spring 24 may come off the spring engaging portion 23c and fall, and in this case, the tip of the movable end end portion 24b of the set spring 24 bites into the inner wall surface 22b of the case 22 and cannot return to its original position. It was hot. As a result, the shutter 23 did not move smoothly, which caused a malfunction.

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 and a distal end portion provided in the case and bent at a substantially right angle move along movement grooves formed on inner wall surfaces facing each other with a predetermined clearance in the case. A disk cassette is provided with a set spring that is arranged to be movable and that places the shutter in a set position, and a pair of set spring accommodating portions are provided on both sides within the case, and a set spring is housed in the pair of set spring accommodating portions. The distal ends of the movable ends of the set springs are respectively engaged with a pair of spring engaging portions protruding from both sides of the shutter, and the movable ends of the set springs are accommodated when the shutter is in a closed state. A concave portion for accommodating the tip of the movable end portion of each set spring is connected to the moving groove of the inner wall surface at a position near the tip of the side tip portion.

[Function] Even if the disk cassette falls while the shutter is in the closed state, the tip of the movable end side of each set spring will be accommodated in each recess formed in connection with the movement groove on the inner wall surface of the case. It will not bite into the inner wall surface. As a result, the distal end of the movable end side of each set spring always moves smoothly between the opposing inner wall surfaces of the case when the shutter is opened and closed.

[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 magnetic disk 2 as a disk having a signal recording surface,
A case 3 rotatably accommodates the disk 2 and has a head insertion hole 3a formed on the upper and lower surfaces, and a notch that is slidably attached to the case 3 and opens and closes the head insertion hole 3a. 4a
and a pair of set springs 5, 5 that bias the shutter 4 so that the non-notched portion 4b of the shutter 4 is overlapped with the head insertion hole 3a. .

The magnetic 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 polymeric material, and a hub receiving hole 10a for exposing the center hub 6 is provided in the center of each shell 10, 11. 11a are formed respectively. In addition, on the inner wall surface of each shell 10, 11, liners (non-woven fabric) 7, 7 are provided on the magnetic disk 2 to prevent wear and static electricity generation and function as a cleaning material.
is installed. And these liners 7,7
The magnetic disk 2 is lightly rotatably sandwiched between the two, and the side walls 10b and 11b 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 at several locations.

Further, the shutter 4 includes a case end face overlapping piece 4.
c and a pair of case clamping pieces 4d and 4e connected to both ends of the case end surface overlapping piece 4c, forming a U-shaped cross section. A non-cutout part 4b is formed in the center of the pair of case clamping pieces 4d, 4e, and cutout parts 4a, 4a are formed at both ends thereof. The case end face overlapping piece 4c and the pair of case clamping pieces 4d and 4e are integrally formed of a polymeric material having a small coefficient of friction and excellent wear resistance. Then, when one end side of the case 3 is inserted through the opening opposite to the case end face overlapping piece 4c, one end face of the case 3 is inserted into the case end face overlapping piece 4c.
The upper shell 10 and the lower shell 11 are sandwiched between the case clamping pieces 4d and 4e.

A pair of sliding guide protrusions 8, 8 are provided at both inner ends of the case end face overlapping piece 4c of the shutter 4, so that when one end side of the case 3 is inserted into the shutter 4, the top side of the case 3 The shutter 4 is slidably attached to the case 3 by fitting into a pair of provided sliding guide grooves 9, 9. Also,
A spring engaging portion 4f is connected to one side of each of the sliding guide projections 8.

Further, a set spring 5 is accommodated in a pair of set spring accommodating portions 12, 12 provided on both sides of the case 3, respectively. As shown in FIG. 3, each of the set springs 5 is made of a linear spring material and has a coiled portion 5a formed at its center, and its tip portions 5b and 5c on both sides are bent at approximately right angles in alternate directions. It has been formed. The distal end portion 5b on the movable end side of each set spring 5 accommodated in each set spring accommodating portion 12 is engaged with each spring engaging portion 4f.
The shutter 4 is set in the center of the shutter sliding surface 3b of the case 3, and the non-notched portion 4b of the shutter 4 closes the head insertion hole 3a. If you slide the shutter 4 left and right against the force,
The notch portions 4a provided on both sides of the non-notch portion 4b overlap the head insertion hole 3a.
It's starting to open.

Each of the spring accommodating portions 12 corresponds to each shell 1.
At both corners of the left and right side walls 10b, 11b of 0, 11, outer surfaces 10c, 11 of the side walls 10b, 11b.
a first rib 12a formed to be parallel to the upper side walls 10d and 11d at a predetermined distance from each other; A predetermined inclination angle from the tip of 12b (approximately 130° in this example)
a third rib 12c that is inclined and formed to extend toward the upper side walls 10d and 11d;
Inner wall surfaces 10e, 11 surrounded by these ribs 12a, 12b, 12c and upper side walls 10d, 11d
e forms a substantially trapezoidal hollow section. Thus, on the upper part of each set spring accommodating portion 12, that is, on the inner wall surfaces 10e and 11e on the side of the upper side walls 10d and 11d of each shell 10 and 11, the tips of both end portions 5b and 5c of each set spring 5, especially Movement grooves 10f and 11f are respectively formed for accommodating and moving the tip of the tip portion 5b on the movable end side.

Further, as shown in FIGS. 3 to 6, inner wall surfaces 11e and 10e in the vicinity of the tips of the tip portions 5b on the movable end side of each of the set springs 5 when the shutter 4 is in the closed state are provided with the respective sets. The movable groove 1 is inclined toward the tip 5c of the fixed end of the spring 5.
Recess 1 cut out at the bottom of 1f and 10f and communicating with each other
3 are formed respectively. A fourth rib 14 is integrally formed at the lower part of each recess 13 to protrude in parallel with the moving grooves 11f and 10f. As a result, when the shutter 4 is closed, the clearance of the moving region (area) of the distal end portion 5b on the movable end side of each set spring 5 near each spring engaging portion 4f is made larger than the inner wall surfaces 11e and 10e at other positions. The sharp tip of the distal end portion 5b on the movable end side touches the inner wall surface 11 of each set spring accommodating portion 12 on the moving groove 11f, 10f side.
e, 10e so as not to cut into them.

Thus, the disk cassette 1 is connected to the shutter 4.
Recording and reproduction can be performed on both sides of the magnetic disk 2 using a single head configured to be slidable to either the left or right.

According to the disk cassette 1 of the embodiment described above, the shutter 4 is pressed at both ends by the spring force of each set spring 5, and the shutter sliding surface 3b of the case 3 is pressed.
, and the head insertion hole 3a is closed by the non-notched portion 4b. From this state, if the shutter 4 is slid in one direction against the spring force of one set spring 5, the non-notched portion 4b
The notch 4a formed on one side is the head insertion hole 3.
When the head insertion hole 3a is opened and the shutter 4 is slid in the other direction, the notch 4a formed on the other side of the non-cutout portion 4b overlaps the head insertion hole 3a. Then, open the head insertion hole 3a.

Further, when the disk cassette 1 is dropped, as shown by the two-dot chain line in FIGS. 5 and 6, the movable end end portion 5b of one of the set springs 5 is disengaged from the spring engaging portion 4f, causing the predetermined engagement. When the distal end portion 5b is shifted downward from the matching position, the distal end portion 5b is accommodated in the recess 13 formed in the inner wall surface 11e of the set spring accommodating portion 12, or is latched onto the fourth rib 14, and is moved as in the conventional case. It will not bite into the inner wall surface 11e and become unable to return to its original position. In this case, when the shutter 4 is slid, the coiled part 5a of the set spring 5 comes into contact with the third rib 12c and is pushed up, and the tip part 5b on the movable end side automatically engages with the spring engaging part 4f. Since they are engaged, the shutter 4 can be moved smoothly without any hindrance. Incidentally, the other set spring 5 also acts in the same manner.

[Effects of the invention] As described above, according to this invention, the tip portions provided in the case and bent at approximately right angles are formed on the inner wall surfaces of the case facing each other at a predetermined interval. arranged to move along the groove,
In a disk cassette having a set spring for locating the shutter in the set position, a pair of set spring accommodating portions are provided on both sides within the case, a set spring is housed in each of the pair of set spring accommodating portions, and each set spring is The movable end side tips of the springs are respectively engaged with a pair of spring engaging parts protruding from both sides of the shutter, and the shutters are opposed to the tips of the movable end side tips of each set spring when the shutter is in a closed state. Since recesses for accommodating the distal ends of the movable ends of each set spring are connected to the moving grooves of the inner wall surface at positions near the movable ends of the set springs, when the disk cassette falls, etc., the movable ends of each set spring The distal end portion can be accommodated in each of the recesses,
The tip will not forcefully move and bite into the inner wall surface of the case. As a result, the movable end end portion of each set spring can always return to its original position, and the shutter can always be smoothly reciprocated.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a disk cassette according to an embodiment of this invention, Fig. 2 is a perspective view of the disk cassette, Fig. 3 is a partially cutaway perspective view of the same disk cassette, and Fig. 4 is an exploded perspective view of the disk cassette. 5 is a partial side view of the main part, FIG. 6 is a sectional view taken along the line - in FIG. 5, FIG. 7 is a plan view of a conventional disk cassette, and FIG. FIG. 9 is a bottom view of the disk cassette, and is a partial plan view of a conventional set spring in an attached state. 1...Disk cassette, 2...Disk, 3
...Case, 3a...Head insertion hole, 4...Shutter, 4f, 4f...Pair of spring engagement parts,
5...Set spring, 5b...Tip on movable end side, 10e, 11e...Inner wall surface, 10f, 11
f...Movement groove, 12, 12...Pair of set spring accommodating parts, 13...Recessed part.

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 spring whose tip portion is bent to move along movement grooves formed on inner wall surfaces facing each other with a predetermined clearance in the case, and to place the shutter at a set position; In the disk cassette, a pair of set spring accommodating portions are provided on both sides in the case, and a set spring is accommodated in each of the pair of set spring accommodating portions, and a distal end portion on the movable end side of each set spring is movement of the inner wall surface at a position near the tip of the tip of the movable end side of each set spring when the shutter is in a closed state, engaging with a pair of spring engaging portions protruding on both sides of the shutter; A disk cassette characterized in that the grooves are connected with recesses for accommodating the tips of the movable end ends of each of the set springs.