JPH0510281Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention includes a cassette housing in which a head insertion hole is formed, a disk rotatably housed inside the cassette housing, and a shutter with a U-shaped cross section, which is attached to the cassette casing so as to be able to slide freely parallel to one end surface and open and close the head insertion hole; The present invention relates to a disk cassette including a spring that urges the shutter from a position where the head insertion hole is opened to a position where it is closed.

BACKGROUND ART FIGS. 5 to 7 show conventional examples of the above-mentioned disk cassette. As shown in FIG. 5, the cassette housing 2 of this disk cassette 1 consists of a pair of synthetic resin halves 2a and 2b.
These halves 2a and 2b are integrally coupled so as to face each other. Inside the cassette case 2,
A disk 3, which is a recording medium made of a magnetic sheet, is rotatably housed.

A recess 5 is formed in the outer surface of the half 2a near one end surface 4a, and a head insertion hole 6 is formed in this recess 5. Further, a recess 7 (see FIGS. 2 and 4) is formed on the outer surface of the half 2b near one end surface 4b, and a pad insertion hole 8 is formed in this recess 7 so as to face the head insertion hole 6. It is formed. Note that when the halves 2a and 2b are integrally connected, one end surface 4a and 4b of each are flush with each other to form one end surface 4 of the cassette housing 2 (see FIGS. 2 and 4). ing.

On the other hand, the shutter 11, which is made of stainless steel, aluminum, etc. and has a U-shaped cross section, has one end surface 4.
It is attached to the cassette housing 2 so as to fit into the recesses 5 and 7 while straddling the cassette.

The shutter 11 includes a pair of facing pieces 12 and 13 facing each other, and a connecting piece 14 connecting these facing pieces 12 and 13. At a position near the connecting piece 14 of one opposing piece 12,
Two protrusions 15 and 16 are formed that protrude toward the other opposing piece 13. In addition, the facing pieces 12 and 13 have window holes 1 corresponding to the insertion holes 6 and 8.
7 and 18 are formed.

A groove 21 parallel to the one end surface 4a is formed at a position close to the one end surface 4a of the recess 5 of the half 2a, and when the shutter 11 is attached to the cassette housing 2, the protrusions 15 and 16 are formed in the groove 21. It fits into the groove 21. Therefore, the projections 15 and 16 are guided through the grooves 21, so that the shutter 1
1 is slidable within the recesses 5 and 7 parallel to the one end surface 4.

A linear spring 22 is interposed between the shutter 11 and the cassette housing 2, and in order to lock one end of the linear spring 22, the shutter 11
A protrusion 23 (see FIGS. 6 and 7) is formed on the connecting piece 14 and projects toward the space between the opposing pieces 12 and 13.

Therefore, the biasing force of the linear spring 22 normally slides the shutter 11 to a position where one end surface of the shutter 11 comes into contact with one of the wall surfaces 5a and 7a of the recesses 5 and 7, as shown in FIG. The insertion holes 6 and 8 are respectively closed by opposing pieces 12 and 13. When the shutter 11 is slid to the position shown in FIG. 7 against the biasing force of the linear spring 22, the window holes 17 and 18
are overlapped with the insertion holes 6 and 8, respectively, and these insertion holes 6 and 8 are opened.

Note that recesses 24 and 25 are formed on the inner surfaces of the halves 2a and 2b and near the mounting positions of the linear springs 22, respectively.
is formed. The movement of the projection 23 and the compression and expansion of the linear spring 22 when the shutter 11 slides are performed within the slit formed by the recesses 24 and 25 when the halves 2a and 2b are joined together. .

According to the disk cassette 1 as described above, the head insertion hole 6 and the pad insertion hole 8 can be closed by the shutter 11 when not in use, such as during recording and reproduction. This prevents foreign matter, dust, etc. from entering the cassette housing 2 from the disc 8 and adhering to the disk 3, thereby causing adverse effects on recording and reproduction.

Problems to be Solved by the Invention Incidentally, in the conventional disk cassette 1 as described above, one side end surface of the shutter 11, which is biased by the linear spring 22, comes into contact with the wall surfaces 5a and 7a. Therefore, the shutter 11 is held in a state where the insertion holes 6 and 8 are closed, but the wall surface 5
The heights of a and 7a are only slightly higher than the thickness of the plate forming the shutter 11.

Therefore, if the dimension between the opposing pieces 12 and 13 of the shutter 11 is large, the opposing pieces 12 and 13 of the shutter 11 will be close to the wall surfaces 5a and 7a, as shown by the dashed line in FIG.
There is a risk that normal opening/closing operations may not be possible due to overcoming this.

Moreover, since the wall surfaces 5a and 7a form a step between the outer surface of the cassette housing 2 and the recesses 5 and 7,
The corner portion of the stepped portion is easily damaged due to contact with one end surface of the shutter 11 or the like. As a result, shutter 1
There is even more risk that the normal opening and closing operations due to No. 1 will not be possible.

Means for Solving the Problems The disk cassette 31 according to the present invention has a shutter 11 facing one end surface 4 of the cassette housing 2.
The cassette is constructed such that it has a protrusion 23 formed on one piece 14 so as to protrude toward the one end surface 4 side, and a wall surface 34a that movably accommodates the protrusion 23 and can come into contact with the protrusion 23. A slit 34 is formed in the one end surface 4 of the housing 2.

Function In the disk cassette 31 according to the present invention, the protrusion 23 comes into contact with the wall surface 34a due to the biasing force of the spring 22, and this contact holds the shutter 11 in a state where the head insertion hole 6 is closed. Ru.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In the disk cassette 31 according to this embodiment, the wall surface 34a of the slit 34, which is formed by the recesses 32 and 33 and accommodates the projection 23 of the shutter 11 and the linear spring 22, is moved to the mounting position of the linear spring 22. The configuration may be substantially the same as that of the conventional disk cassette 1 described above, except that they are formed adjacent to each other.

When the shutter 11 is slid toward the position where the insertion holes 6 and 8 are closed, the shutter 1
The position of the wall surface 34a is selected such that the protrusion 23 contacts the wall surface 34a immediately before the one end surface of the recess 5, 7 contacts the wall surface 5a, 7a.

For this reason, when the shutter 11 is in the position where the insertion holes 6 and 8 are opened, the protrusion 23 is spaced apart from the wall surface 34a as in the conventional disk cassette 1, as shown in FIGS. 3 and 4. However, when the shutter 11 is in a position to close the insertion holes 6 and 8, the protrusion 23 is in contact with the wall surface 34a as shown in FIGS. 1 and 2.

According to the disk cassette 31 of this embodiment as described above, the projection 23 is provided on the connecting piece 14 of the shutter 11.
is formed, and the projection 23 is brought into contact with the wall surface 34a of the slit 34 by the biasing force of the linear spring 22 that is locked to the projection 23, and the shutter is moved to a position where the insertion holes 6 and 8 are closed. 11, even if the distance between the opposing pieces 12 and 13 of the shutter 11 is large, one end surface of the shutter 11 will not climb over the wall surfaces 5a and 7a of the recesses 5 and 7.

Moreover, the protrusion 23 is completely housed within the slit 34, and the wall surface 34 that the protrusion 23 comes into contact with is
A does not form a stepped portion like the wall surfaces 5a and 7a. Therefore, the wall surface 34a is not easily damaged by contact with the protrusion 23 or the like.

Further, the shutter 11 is attached to the cassette case 2 so as to be able to slide freely in parallel to the one end surface 4 of the cassette case 2 while straddling the one end surface 4 of the cassette case 2. It will not shift in the vertical direction. Therefore, the protrusion 23 is connected to the wall surface 34.
This ensures that the shutter 11 comes into contact with the wall 5a, 7a, and thereby the one end surface of the shutter 11 does not go over the wall surfaces 5a, 7a.

Note that the protrusion 23 that locks the linear spring 22
It is also possible to form a protrusion separate from the above and make this another protrusion come into contact with the wall surface 34a. Alternatively, a recess may be formed only on one of the inner surfaces of the halves 2a, 2b, and the slit 34 may be formed by this recess. Further, in order to bias the shutter 11, a spring other than the linear spring 22 may be used.

Effects of the Invention As described above, in the disk cassette according to the present invention, the protrusion of the shutter reliably contacts the wall of the slit formed in the cassette housing, so that the normal opening and closing operation of the shutter is reliably performed.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the main parts of an embodiment of the present invention in a state where the shutter is blocking the head insertion hole, Fig. 2 is a sectional view of the main parts in the state shown in Fig. 1, and Fig. 3 4 is a plan view showing the main parts of one embodiment in a state where the shutter opens the head insertion hole, and FIG. 4 is a sectional view of the main parts in the state shown in FIG. 3. FIG. 5 is an exploded perspective view showing a conventional example of the present invention, FIG. 6 is a drawing corresponding to FIG. 1 of the conventional example,
FIG. 7 is a drawing corresponding to FIG. 2 of a conventional example. In addition, in the symbols used in the drawings, 2...cassette housing, 3...disk, 4...one end surface, 6...
Head insertion hole, 11... Shutter, 14... Connection piece, 22... Linear spring, 23... Projection, 34...
...slit, 34a... wall surface.

Claims (1)

[Scope of utility model registration request] A cassette casing in which a head insertion hole is formed, a disk rotatably housed inside the cassette casing, and a disc that straddles one end surface of the cassette casing and slides parallel to this one end surface. a shutter that is movably attached to the cassette housing and has a U-shaped cross section to open and close the head insertion hole; In the disk cassette, each of the disk cassettes is provided with a spring for biasing a shutter, and a protrusion is formed on one piece of the shutter facing the one end surface of the cassette housing so as to protrude toward the one end surface. and a slit formed in the one end surface of the cassette housing so as to movably house the protrusion and have a wall surface with which the protrusion can come into contact, and The disk cassette is characterized in that the protrusion abuts against the wall surface, and this abutment holds the shutter in a state in which it closes the head insertion hole.