JP3002679B2 - Disc cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk cartridge containing a disk-shaped recording medium.

[0002]

2. Description of the Related Art A disc-shaped recording medium used in a recording / reproducing apparatus is housed in a disc cartridge in order to prevent the disc-shaped recording medium from being damaged when not in use and from adhering dust. Is protected by FIG. 13 shows an example of such a disk cartridge. In FIG.
Reference numeral 01 denotes a case composed of an upper half 101a and a lower half 101b. The case 101 accommodates a disk-shaped recording medium 102. A rotating hole 103 for rotating the disk-shaped recording medium when the disk cartridge is loaded in the recording / reproducing apparatus,
A head insertion hole 104 to which the head can access to read and write information is formed.

Here, a shutter 106 is attached to the case 101 in order to prevent dust from entering the inside of the case 101 from the rotation hole 103 or the head insertion hole 104. In addition, the shutter 106 is
The rotation hole 103 and the head insertion hole 104 are always urged by a torsion coil spring 107 housed in the housing 1.

An opening / closing pin P is brought into contact with a portion 106 a of the shutter 106 projecting to the left side in FIG. 13 to open the head insertion hole 104 and the like against the urging force of the torsion coil spring 107.

[0005]

However, in such a conventional disk cartridge, since the metal shutter 106 is in direct sliding contact with the case 101, the shutter 106 can be smoothly moved with respect to the case 101. The shutter 106 and the case 10
1 does not have a guide portion for guiding the shutter 106 in the sliding direction, so that the shutter 106 cannot be reliably guided in the sliding direction. Therefore, it is conceivable to attach a slider that slides on the case 101. However, since the shutter 106 must be provided with a protruding portion 106a with which the opening / closing pin P contacts, the shutter 10 with the slider
There is a possibility that the six parts become complicated and the disk cartridge becomes large.

[0006]

In order to solve such a problem, a disk cartridge according to the present invention comprises a case made of a synthetic resin in which a disk-shaped recording medium is accommodated, and a thin metal plate bent in a U-shaped cross section. A shutter for opening and closing a head insertion hole formed in the case,
A disk cartridge comprising a synthetic resin slider attached to the shutter and slidably in contact with an edge of the case so as to slide in the opening and closing direction of the shutter,
The slider includes a shutter supporting portion that is positioned inside the bent portion of the shutter and supports the shutter, and an extension formed to extend from the end of the bent portion of the shutter in the shutter closing direction. A contact projection that is in contact with an opening / closing pin for moving the shutter in the opening direction is formed at the tip of the extended portion, and the opening / closing pin falls below the contact projection. As described above, the engagement protrusion is integrally formed via the arm having a length substantially equal to the depth of the relief recess formed at the edge of the case. Further, the lower surface of the engagement protrusion may be cut out so as not to come into contact with a holding wall formed on the case and holding the disk-shaped recording medium.

In the slider of the disk cartridge of the present invention, an extended portion is formed to extend from a portion where the shutter is attached. Therefore, an opening / closing pin is brought into contact with a protruding end of the extended portion to push the slider. , The shutter can be opened and closed. Therefore, it is not necessary to form a protruding portion in contact with the opening / closing pin on the shutter.

By the way, to open the shutter, an opening / closing pin is brought into contact with the tip of the extended portion of the slider, and the slider is pushed while sliding on the edge of the case. When the opening of the shutter is completed, the opening / closing pin falls into the escape recess, and the open state of the shutter is maintained. At this time, the engagement protrusion of the extension portion is located in the relief recess. Since the upper surface of the engaging projection is located on the inner side of the case than the bottom of the recess, the opening / closing pin falls completely into the recess, and the shutter can be kept open. Further, when the engaging projection is formed on the extended portion, the engaging projection comes into contact with the holding wall of the case. However, since the notch is formed on the lower surface of the engaging projection, the engaging projection is formed on the holding wall. I will not touch you.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a disk cartridge case. The case 1 is made of a synthetic resin and has an upper half 1a and a lower half 1 made of a rectangular flat casing.
b. The case 1 houses a 3.5-inch optical disk 2 (disk-shaped recording medium) on which optical information is recorded. In the center of the lower half 1b of the case 1, when the optical disc 2 is loaded in the recording / reproducing apparatus,
A rotation hole 4 for rotating the optical disk 2 in the case 1 by a spindle motor (not shown) is formed, and a hub portion 2 a provided at the center of the optical disk 2 is exposed from the rotation hole 4. Upper and lower half 1 of case 1
Head insertion holes 3 are formed in a and 1b so that an optical head (not shown) for reading information recorded on the optical disk 2 can be accessed.

When the optical disk 2 is not used, a shutter 5 is provided on the case 1 in order to prevent dust from entering the case 1 through the rotation hole 4 and the head insertion hole 3.
Is installed. The shutter 5 is formed by bending a thin metal plate of stainless steel or the like into a substantially U-shaped cross section from substantially the center, and includes an opening / closing plate portion 6 for opening and closing the rotary hole 4 and the head insertion hole 3. Also has an auxiliary opening / closing plate 7 having a short bending length.

As shown in FIG. 3, a guide portion G formed at the leading end of the case 1 on the recording / reproducing apparatus insertion side is formed on the left side in the figure and extends horizontally to a position dropped from the upper end surface of the case 1. It has a guide surface 8. On the right side of the guide surface 8 in the drawing, an escape recess 9 is formed for allowing an opening / closing pin P for opening and closing the shutter 5 to slide down when the shutter 5 is opened while sliding on the guide surface 8.
The opening / closing pin P moves the shutter 5 to the right in FIG. 3 to open the head insertion hole 3.

A bent portion 5a of the shutter 5 having a substantially U-shaped cross section
A slider 12 made of a synthetic resin such as polyacetal, which is in sliding contact with the guide portion G, is attached to the inner surface side of the slider. The slider 12 has a substantially right half in FIG.
Is fixed to the inner surface side of the base plate by a tapping screw or the like.

The slider 12 has an overall structure as shown in FIG.
Is shaped like an elongated rod, has a substantially rectangular cross section, and
The shutter 5 is located inside the bent portion 5a of the
The supporting portion 21 of the shutter to be supported, and from the supporting portion 21
A narrow extension 22 formed by extending to the lower left in FIG.
And a thickness t of the extended portion 22 as viewed from above in FIG. ₁
Is the same thickness t of the support 21_TwoSo that it is smaller than
Is formed. The right side of the support 21 in FIG.
A second engaging protrusion 23 is formed on the side of
Also on the side, the lower side via the contact protrusion 25 and the arm 33
A first engagement protrusion 26 is formed on the side. The support section
21 is formed with screw holes 21a, 21a.
The protruding portion 25 projects left and right from the tip of the extension portion 22.
I have. The thickness t of the extension 22₁Is reduced in the figure
Recording / reproducing apparatus with shutter 5 open as shown in FIG.
Pair of heads h approach the head insertion opening 3 from the side
To avoid contact with it. Sand
A recess formed along the guide portion G of the cartridge.
The thickness of the extension 22 should not exceed the thickness of the recess 31.
T₁Is determined.

As shown in FIGS. 6 and 7, a pair of projections 23a and 23b are formed on both sides of the second engagement projection 23 of the slider 12, and the pair of projections 23 are formed.
a and 23b are a pair of guide grooves 27 formed on the inner wall surfaces of the upper and lower halves 1a and 1b in the sliding direction of the slider 12.
a, 27b (guide engagement portions). Note that one protruding portion 23a is formed long and the other protruding portion 23b is formed short.

A first spring receiving portion 15 to which one end 14a of the torsion coil spring 14 is engaged is formed on the second engaging projection 23, and a hook portion 15a is formed on the first spring receiving portion 15. ing. The other end 14b of the torsion coil spring 14 is engaged with the upper right end of the case 1 in FIG.
6, the slider 12 is urged leftward in FIG. 7 by the urging force of the torsion coil spring. Further, a split groove 23c into which the torsion coil spring 14 can be fitted is formed in the second engaging projection 23. The other protrusion 23b is formed short because the other arm 14b of the torsion coil spring 14 collides with the protrusion 23b when the shutter 5 is completely opened as shown in FIG. To avoid.

On the other hand, as shown in FIGS. 8 and 9, the contact projection 25 formed at the tip of the extension 22 of the slider 12 slides on the guide surface 8 when pressed by the opening / closing pin P. . In addition, on the left end side of the extension portion 22, FIG.
As shown in the figure, the first engagement protrusion 26 is integrally formed via the arm 33 formed below. The first engagement protrusions 26 are engaged with guide engagement portions 28a and 28b formed on the case 1 along the sliding direction of the slider 12, respectively, to guide the slider 12 in the sliding direction, and It is prevented from easily coming off from 1.

When the slider 12 is slid to the upper left in FIG. 11 by the opening / closing pin P, the first engaging projection 26 is located in the relief recess 9. The first engagement projection 26 is formed such that the upper surface 26a is located below the bottom 9a of the relief recess 9, as shown in FIG. on the other hand,
As shown in FIG. 9, a substantially arc-shaped holding wall portion 32 formed for storing and holding the optical disk 2 in the case 1 is located on the lower surface 26 b side of the first engagement protrusion portion 26. For this reason, the lower surface 26b is provided with a cutout portion 26c which is cut out in the same arc shape so as not to come into contact with the holding wall portion 32.

In order to open the shutter 5 that closes the head insertion hole 3, an opening / closing pin P is brought into contact with the tip of the contact projection 25 of the slider 12 as shown in FIG. P pushes the slider 12 to the right while sliding on the guide surface 8 (edge of the case). The slider 12 is configured such that the contact protrusion 25 and the first engagement protrusion 26 are formed on the guide surface 8 and the guide engagement portions 28a, respectively.
When sliding to the right while being guided by 28b, the support portion 22
Is moved to the right to open the head insertion hole 3. When the opening of the shutter 5 is completed, the opening / closing pin P falls into the escape recess 9 to maintain the shutter 5 in the open state. At this time, the first engagement protrusion 26 is
As shown in FIG.

Therefore, the upper surface 26a of the first engagement protrusion 26
However, assuming that the opening / closing pin P is located above the bottom 9a of the recess 9 in FIG. 12, the opening / closing pin P contacts the upper surface 26a even if it tries to fall, preventing the falling into the recess 9 completely. Is done. In this manner, the opening / closing pin P is recessed 9
Is prevented from completely falling into the torsion coil spring 1, the opening / closing pin P is not securely engaged with the escape recess 9.
4 by the slider 12 receiving the urging force of
Is pushed out of the escape recess 9 and the shutter 5
The holding of the open state becomes unstable.

However, the upper surface 26a of the first engagement protrusion 26
Is located below the bottom 9a of the recess 9 in FIG. 12, the opening / closing pin P falls completely into the recess 9 and is securely engaged therewith. Therefore, the opening / closing pin P is engaged with the arm portion 27 of the slider 12, and the shutter 5 can be kept open. In order to position the upper surface 26a below the bottom portion 9a, if the first engagement protrusion 26 is formed from the extension portion 22 downward in FIG.
The lower surface 26b abuts against the holding wall 32 of the case 1.
Is formed with a notch 26c, so that the holding wall 32
Never abut.

On the other hand, since the extended portion 22 is formed on the slider 12 so as to extend from the bent portion 5a of the shutter 5, the opening and closing pin P is brought into contact with the protruding end of the extended portion 22 to push the slider 12. Thus, the shutter 5 can be opened and closed. Therefore, it is not necessary to form a protruding portion in contact with the opening / closing pin P on the shutter 5. And
This disk cartridge can be downsized.

[0022]

As described above, according to the present invention, the slider is formed by extending the extending portion which can be brought into contact with the opening / closing pin from the portion where the shutter is mounted. The shutter can be opened and closed by bringing the pin into contact. Therefore, it is not necessary to form a protruding portion in contact with the opening / closing pin on the shutter, and the shutter portion to which the slider is attached is simplified, and the size of the disk cartridge can be reduced.

Further, an engaging projection for engaging with the guide engaging portion of the case is formed at the distal end of the extending portion, and the upper surface of the engaging projection is made higher than the recessed bottom formed at the edge of the case. Since the shutter is positioned inside the case, the opening / closing pin, which has finished opening the shutter, falls completely into the escape recess and is securely engaged therewith. Therefore, the opening / closing pin is engaged with the slider, and the open state of the shutter can be maintained. Furthermore, since the lower surface of the engaging projection is cut out so as not to abut on the holding wall formed on the case and holding the disk-shaped recording medium, the engaging projection does not abut on the holding wall. .

[Brief description of the drawings]

FIG. 1 is a perspective view of the front side of a disk cartridge using a slider.

FIG. 2 is a perspective view of the back side of a disk cartridge using a slider.

FIG. 3 is a front view of the disk cartridge.

FIG. 4 is a perspective view of a slider.

FIG. 5 is an explanatory diagram of a state of a guide unit when a shutter is opened.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a partial plan view of the disc cartridge.

FIG. 9 is a partial sectional view of the disc cartridge.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a perspective view as viewed in the direction of arrow XI in FIG. 9;

FIG. 12 is a sectional view taken along line XII-XII in FIG. 11;

FIG. 13 is a perspective view showing a conventional disk cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 3 ... Head insertion hole 5 ... Shutter 9 ... Relief dent 9a ... Bottom part 12 ... Slider 22 ... Extension part 26 ... 1st engagement protrusion part 26c ... Notch part 32 ... Holding wall part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 23/03 G11B 23/033

Claims (6)

(57) [Claims] 1. A case made of a synthetic resin in which a disk-shaped recording medium is stored, a shutter formed by bending a thin metal plate into a U-shaped cross section, and opening and closing a head insertion hole formed in the case; Attached to this shutter,
A disk cartridge comprising a synthetic resin slider that slides in the opening and closing direction of the shutter and slides on the edge of the case, wherein the slider is located inside a bent portion of the shutter and moves the shutter. A shutter support portion for supporting the shutter; and an extended portion formed to extend from the end portion of the bent portion of the shutter in the shutter closing direction side. An abutment projection for contacting the opening / closing pin for movement is formed, and below the abutment projection, a depth of a relief recess formed at an edge of the case so that the opening / closing pin falls down. A disc cartridge, wherein an engagement protrusion is integrally formed via an arm having an equal length. 2. The disk cartridge according to claim 1, wherein the engaging projection is located on the inner side of the case than the bottom of the recess. 3. The disk cartridge according to claim 1, wherein the engagement projection is formed to be longer than a length of a bottom of the relief recess. 4. The disk cartridge according to claim 3, wherein the distal end of the engagement projection has a length that engages with the guide engagement portion formed on the case even when the shutter is opened. 5. The engagement projection according to claim 1, wherein a lower surface of the engagement projection is cut out so as not to come into contact with a holding wall formed on the case and holding the disk-shaped recording medium. Disk cartridge. 6. A shutter supporting part on a side of a shutter opening direction,
6. The disk cartridge according to claim 1, wherein an elastic member for urging the shutter in a closing direction is engageable.