JPH0516700Y2 - - 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 tip of the set spring that disposes 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 provided in the case, and its tip bent at a substantially right angle is arranged to move along between both inner wall surfaces facing each other with a predetermined clearance in the case, and the shutter is moved to the set position. In a disk cassette having a set spring disposed, the movable side arm of the set spring is placed near the other inner wall surface of the case on one inner wall surface of the case opposite to the movable side tip of the set spring. By forming a protruding rib that guides the set spring in sliding motion, the tip of the movable side tip of the set spring is prevented from contacting one of the inner wall surfaces of the case, and the tip of the movable side tip of the set spring is This prevents the inner wall surface of one side of the case from being scratched so that the shutter can always be moved smoothly.

[Prior Art] A disk cassette 20 as shown in FIGS. 10 to 12 is known. This disk cassette 20
includes a disk 21 having a signal recording surface, rotatably housing this disk 21, and
A case 22 has a head insertion hole 22a formed on its upper and lower surfaces, and a notch 23a and a non-cutout portion 23b which are slidably attached to the outside of the upper center of the case 22 to open and close the head insertion hole 22a. Shutter 23 and non-cut portion 2 of this shutter 23
3b is positioned above the head insertion hole 22a. Therefore, both tips 24a, 24 of this set spring 24
b are bent at substantially right angles in alternating directions, and one end portion 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 in an open state.

[Problems to be Solved by the Invention] However, in the conventional disk cassette 20, as shown in FIG.
The movable end portion 24 of the set spring 24 slides in contact with the inner wall surface of the moving groove 22b.
The length accuracy of b is not uniform and has variations,
Since the sliding resistance may become very large, the movable end portion 2 of the set spring 24
The inner wall surface of the moving groove 22b of the case 22 is scraped by the tip of the shutter 4b, and the shutter 23 cannot be moved smoothly due to clogging with the shavings, which may lead to failure.

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 that exposes the disk, and a case that is slidably attached to the case and that allows the head insertion hole to be slidably attached to the case. A shutter for opening and closing the hole, and a shutter provided in the case, the distal end portion of which is bent at a substantially right angle, is arranged so as to move along between both inner wall surfaces facing each other with a predetermined clearance in the case. , a disk cassette having a set spring for locating the shutter in the set position, wherein the movable side arm of the set spring is attached to one inner wall surface of the case opposite to the movable side tip of the set spring. A rib is formed to protrude near the other inner wall surface of the case for sliding guidance.

[Operation] When the shutter moves, the tip of the movable end of the set spring moves along the rib of one inner wall surface of the case without coming into contact with the inner wall surface. This prevents the tip of 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 7, 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 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 molded from a polymeric material having a small coefficient of friction and 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 shutter 4 is inserted into the sliding guide groove 8 formed in the case 3.
By fitting the sliding guide protrusion 9 provided on the inner surface of the case 3, the shutter 4 is slidably attached to the shutter sliding surface 3b of the case 3, and is located at the center of the shutter sliding surface 3b. When the head insertion hole 3a is opened, the non-notched portion 4b closes the head insertion hole 3a.

Further, as shown in FIG. 4, the set spring 5 is made of a linear spring material and has a coiled portion 5a formed at its center, and has tip portions 5d and 5e of its both side arm portions 5b and 5c 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.

The set spring housing portions 12 are provided at both corners of the left and right side walls 10b, 11b of each shell 10, 11, on the outer surfaces 10c, 1 of the side walls 10b, 11b.
1c, a first protruding portion 12a formed parallel to the upper side wall 10d at a predetermined interval, and upper side walls 10d, 11.
d and a second protruding part 12b formed parallel to the second protruding part 12b at a predetermined interval.
at a predetermined angle of inclination (in this example,
130°) and extends toward the upper side walls 10d and 11d.
2c, and each of these convex portions 12a, 12b, 12c
and inner wall surface 1 surrounded by upper side walls 10d and 11d
0e and 11e form a substantially trapezoidal hollow section. Further, the upper side wall 10d of each set spring accommodating portion 12, that is, the upper side wall 10d of each shell 10, 11,
Inner wall surfaces 10e and 11e on the 11d side are formed with movement grooves 10f and 11f, respectively, for accommodating and moving the tips of both tip portions 5d and 5e of the set spring 5, particularly the tip of the movable side tip portion 5d. .

Furthermore, as shown in FIG. 7, the shells 10 and 11 constituting the set spring accommodating portion 12 are made to have the same wall thickness, and an upper side wall is attached to the inner wall surface 11e facing the movable end portion 5d of the set spring 5. 1
A rib 11g extending parallel to 1d and tapered on the coiled portion 5a side of the set spring 5 is integrally formed to protrude. This prevents the movable end portion 5d of the set spring 5 from coming into contact with the inner wall surface of the moving groove 11f. Also, the fifth
6. As shown by the two-dot chain line in FIG.
A rib 10g having the same structure as that described above is formed on the set spring 5 to further stabilize the movement of the movable end portion 5d of the set spring 5. As a result, the clearance of the movement area of both arm portions 5b and 5c of the set spring 5 is reduced, and
The sharp tip of the movable end portion 5d is connected to the moving groove 11 on the upper side wall 11d side of the set spring accommodating portion 12.
If it gets caught on the inner wall surface of f or the moving groove 11
This prevents the inner wall surface of f from being scraped off.

Reference numerals 13 are 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 movable end portion 5b is fitted into the movable side, the set spring 5 and the shutter 4 are positioned.

According to the disk cassette 1 of the embodiment described above, 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 closed by the non-notched portion 4b. 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. On this occasion,
Inner wall surface 11e of the set spring accommodating portion 12 facing the movable end portion 5d of the set spring 5
A rib 11g is integrally formed to guide the movable arm portion 5b of the set spring 5 to slide near the inner wall surface 10e facing the inner wall surface 11e, as shown in FIG. The tip of the movable side tip 5d of the set spring 5 is the moving groove 11f.
Since the movable end portion 5d of the set spring 5 does not come into contact with the inner wall surface of the set spring 5, the upper side wall 11 of the set spring accommodating portion 12 is
It is possible to prevent the inner wall surface of the moving groove 11f on the d side from getting caught or being scraped, and the shutter 4 can always be moved smoothly.

8 and 9 show other embodiments. In the embodiment described above, the wall thicknesses of the shells 10 and 11 constituting the set spring accommodating portion 12 were formed to be the same, but in this other embodiment, the wall thickness of the lower shell 11 constituting the set spring accommodating portion 12 was formed to be the same. The upper shell 10
It is formed so that it is thicker than the wall thickness of. That is,
As shown in FIG. 9, the wall thickness t ₁ of the lower shell 11 on the side of the inner wall surface 11e facing the movable end 5d of the set spring 5 is placed on the side of the inner wall surface 10e facing the inner wall surface 11e. The wall thickness of the upper shell 10 is t ₂
It is formed by filling the entire surface so that it has a thicker wall (t ₁ > t ₂ ). As a result, the clearance of the movement area of both arm portions 5b and 5c of the set spring 5 is reduced, and the distal end portion 5d on the movable side is
This prevents the sharp tip from getting caught on the inner wall surface of the moving groove 11f on the side of the upper side wall 11d of the set spring accommodating portion 12, or from scraping the inner wall surface of the moving groove 11f.

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 tip portion 5d on the movable side of the set spring 5 is inserted.
and the circumferential surface of the fixed end portion 5e contact the upper side walls 10d, 11d, and both arm portions 5b, 5c of the set spring 5 contact the inner wall surfaces 10e, 11e of the set spring accommodating portion 12. The set spring 5 is attached to the set spring accommodating portion 12 with the coiled portion 5a in contact with the inner surface of the third convex portion 12c. 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 presses the shutter 4 from both ends with its spring force. 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.

According to the other embodiment with the above configuration, 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 closed by the non-notched portion 4b. 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 11e of the set spring accommodating portion 12 facing the movable side tip 5d of the set spring 5 is made thicker than the inner wall surface 10e corresponding to the inner wall surface 11e, so that both side arms of the set spring 5 are Parts 5b, 5c
Minimize the clearance of the movement area as much as possible,
Since the tip of the tip portion 5d is prevented from contacting the inner wall surface of the moving groove 11f, the set spring 5
The sharp tip of the movable side tip 5d may catch the inner wall surface of the moving groove 11f on the upper side wall 11d side of the set spring accommodating portion 12, or the moving groove 11
Scraping of the inner wall surface of f can be prevented, and the shutter 4 can always be moved smoothly.

[Effects of the invention] As described above, according to this invention, the shutter is provided in the case, and its movable end is arranged to move along one inner wall surface of the case to move the shutter to the set position. In a disk cassette having a set spring arranged, the movable side arm of the set spring is placed near the other inner wall surface of the case on one inner wall surface of the case opposite to the movable side tip of the set spring. Since the rib is formed to protrude and guide the movable side of the set spring, the tip of the movable side of the set spring does not come into contact with the one inner wall surface when the tip moves.
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 drawings]

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 an enlarged partially cutaway plan view of the disk cassette, FIG. 7 is a partially sectional view of the disk cassette showing the installation state of the set spring, and FIG. 8 is a partially cutaway view of the disk cassette of another embodiment. Plan view,
FIG. 9 is a partial sectional view of the disk cassette of the other embodiment described above showing the installation state of the set spring, FIG. 10 is a plan view of the conventional disk cassette, and FIG. 11 is a bottom view of the same disk cassette. FIG. 12 is a partial plan view of a conventional disk cassette showing the state in which the set spring is attached. 1...Disk cassette, 2...Disk, 3
. . . Case, 3a . . . Head insertion hole, 4 . ...One inner wall surface, 11g...
…rib.

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 disk cassette having a set spring whose distal end portion bent at a right angle is arranged to move along between two opposing inner wall surfaces with a predetermined clearance in the case to place the shutter at a set position. A rib is provided on one inner wall surface of the case opposite to the movable end of the set spring for guiding the arm portion of the movable side of the set spring so that it slides near the other inner wall surface of the case. A disk cassette characterized in that it has a protruding shape.