JP2945310B2 - Disk cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge containing a disk-shaped recording medium, and more particularly to a slider for guiding a shutter of a 3.5-inch disk cartridge.

[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 As such a disk cartridge, for example,
There is one as shown in FIG. In FIG. 10, reference numeral 101 denotes a case composed of an upper half 101a and a lower half 101b. In this case 101, a disk-shaped recording medium 102 is housed. When this disk cartridge is mounted on the recording / reproducing apparatus,
A rotary hole 103 for rotating the disk-shaped recording medium and a head insertion hole 104 to which a head can be accessed for reading and writing information are 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. The shutter 102 has a case of 1
01 is constantly urged by the torsion coil spring 107 housed in the rotation hole 103 and the head insertion hole 104.
Is closed.

An opening / closing pin P is brought into contact with a portion 106a of the shutter 106 projecting to the left side in FIG. 10 to open a head insertion hole 104 and the like against the urging force of a torsion coil spring 107.

[0005]

However, in such a conventional disk cartridge, the metal shutter 106 is in direct sliding contact with the case 101.
It is difficult to slide the shutter 106 smoothly with respect to the case 101, and since the shutter 106 and the case 101 are not provided with a guide portion for guiding the shutter 106 in the sliding direction, the shutter 102 is moved in the sliding direction. There was a problem that it was not possible to be surely guided to. 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 106 portion on which the slider is attached becomes complicated. In addition, there is a possibility that the size of the disk cartridge is increased.

[0006]

In order to solve such a problem, according to the present invention, a case (1) accommodating a disk-shaped recording medium and a head insertion hole (1) formed in the case are provided. 3) a shutter (5) for opening and closing the head insertion hole with an opening / closing pin; and a slider (12) attached to the shutter and coming into contact with the case so as to slide in the opening and closing direction of the shutter. In the disk cartridge provided, the shutter (5) is formed in a substantially U-shaped cross-section having a bent portion (5a) located on the recording / reproducing device insertion side of the case (1), and the slider (12) is formed. ) Is a shutter supporting portion (21) located on the inner surface side of the bent portion (5a) and fixing the shutter (5), and a shutter closing direction side of the bent portion (5a). An extension (22) extending from the shutter support (21) so as to protrude from the shutter; and an extension (22) so as to abut an opening / closing pin when the shutter (5) is moved in the opening direction. ) And an abutting projection (25) formed at the tip of (2).

[0007] The slider has an engaging projection for engaging with a guide engaging portion provided on a case, at the distal end of the extended portion, or at the distal end of the extended portion and the shutter support. It may be provided on both sides of the other end of the unit.

The slider has an extended portion extending from a portion to which the shutter is attached, and has a contact projection at the tip end of the extended portion with which an opening / closing pin can contact. I have. Further, since the slider is formed of a synthetic resin having lubricity, the slider has lubricity with respect to the case. Therefore, the shutter can be opened and closed by bringing the opening / closing pin into contact with the contact projection and pressing the slider, and it is not necessary to form a projecting portion in contact with the opening / closing pin on the shutter. Further, when an engagement protrusion is further formed on the slider, and this engagement protrusion is engaged with a guide engagement portion provided on the case, the slider is reliably guided at the time of opening and closing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIGS. 1 to 9 show an embodiment of a slider of a 3.5-inch disk cartridge according to the present invention.

In FIGS. 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 1b which are entirely rectangular and have a flat plate shape. . 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, there is formed a rotary hole 4 for rotating the optical disk 2 in the case 1 by a spindle motor (not shown) when the optical disk 2 is mounted on the recording / reproducing apparatus. The hub 2a provided at the center of the optical disk 2 is exposed from the rotation hole 4. In addition, a head insertion hole 3 is formed in the upper and lower halves 1a and 1b of the case 1 so that an optical head (not shown) for reading information recorded on the optical disk 2 can be approached.

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 distal end of the recording / reproducing device of the case 1 is formed on the left side in the figure and extends horizontally from the upper end surface of the case 1 to a position lowered from the upper end surface. It has a surface 8. An opening / closing pin P for opening and closing the shutter 5 is provided on the right side of the guide surface 8 in FIG.
An escape recess 9 is formed to drop when the shutter 5 is opened. The opening / closing pin P moves the shutter 5 to the right in FIG. 3 to open the head insertion hole 3.

On the other hand, if the front and back of the disk cartridge are erroneously mounted on the recording / reproducing apparatus, the opening / closing pin P malfunctions. In order to prevent the malfunction of the opening / closing pin P, notches 10a and 10b into which the opening / closing pin P can be fitted are formed at the insertion tip portions of the upper half 1a and the lower half 1b opposite to the guide surface 8. A pair of malfunction preventing walls 11a and 11b are formed at the notches 10a and 10b so as to protrude upward adjacent to the left side in FIG.

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.
Are fixed to the inner surface side of the base plate by tapping screws or the like.

The slider 12 has an elongated rod shape as a whole as shown in FIG. 21 and a narrow extending portion 22 formed by extending from the supporting portion 21 to the lower left in FIG. 4, and the thickness t of the extending portion 22 as viewed from above in the drawing.
₁ is formed so as to be narrower than the same thickness t ₂ of the support portion 21. An engaging protrusion 23 is formed on the right side of the support 21 in FIG. 4, and an engaging protrusion 24 is also formed on the left side of the extension 22, and the engaging protrusion 24 is formed on the upper side. Contact projection 25 and fitting projection 26 formed on the lower side
(Second fitting projection) . The support part 2
In FIG. 1, screw holes 21 a, 21 a are formed, and the contact protrusion 25 protrudes left and right from the tip of the extended portion 22.

As shown in FIGS. 5 and 6, a pair of projections 2 are provided on both sides of the engagement projection 23 of the slider 12.
3a, 23b (first fitting protrusions) are formed, and the pair of protrusions 23a, 23b are formed on a pair of guides formed on the inner wall surfaces of the upper and lower halves 1a, 1b in the sliding direction of the slider 12. The grooves 27a and 27b ( first guide engaging portions) are fitted. Note that one protruding portion 23a is formed long and the other protruding portion 23b is formed short. A first end 14 a of the torsion coil spring 14 is engaged with the engagement protrusion 23.
A spring receiving portion 15 is formed, and a hook portion 15a is formed on the first spring receiving portion 15. A second spring receiving portion 16 with which the other end 14b of the torsion coil spring 14 is engaged is formed at the upper right end in FIG. 6 of the case 1, and the slider 12 is moved by the biasing force of the torsion coil spring 14 to the left in FIG. It is biased toward. Further, a split groove 23c into which the torsion coil spring 14 can be fitted is formed in the engagement projection 23. The reason why the other protrusion 23b is formed short is that the arm 14b of the torsion coil spring 14 moves when the shutter 5 is completely opened as shown in FIG.
This is to avoid colliding with b.

On the other hand, as shown in FIG. 7, the slider 12 has a bent portion 5 of the shutter 5 so as to be able to contact the opening / closing pin P.
2A, the thickness t ₁ of the extended portion 22 is reduced because the pair of heads h of the recording / reproducing apparatus is set in a state where the shutter 5 is opened. This is to prevent the head insertion slot 3 from coming into contact with the head insertion slot 3 even when approached from one side (FIG. 9). That is, the thickness t ₁ of the extension portion 22 is determined so as not to exceed the thickness of the concave recessed portion 31 formed along the guide portion G of the cartridge. The contact protrusion 25 formed at the tip of the extension portion 22 of the slider 12 slides on the guide surface 8.

Further, on the left end side of the extension portion 22, an engagement protrusion 26 is formed via an arm formed below as shown in FIG.
(A second fitting projection) is integrally formed. Engaging projection 26 engaging projection portions 28a which are formed along the sliding direction of the slider 12 in the case 1, 28b (second guide
The slider 12 guides the slider 12 in the sliding direction and prevents the slider 12 from easily coming off the case 1. When the shutter 5 is completely opened, the upper surface of the engagement projection 26 is substantially flush with the bottom surface of the escape recess 9 formed in the guide portion G, so that the opening / closing pin P can be inserted into the escape recess 9. It does not interfere (FIG. 7).

The slider 12 is made of a slippery synthetic resin such as polyacetal.
a, 1b are also made of a synthetic resin having a lubricating of polycarbonate Nate like. For this reason, the engagement protrusion 23 of the slider 12
The projections 23a, 23b (first fitting projections) have lubricity with respect to the guide grooves 27a, 27b ( first guide engagement parts ) to be fitted, while the contact projections of the engagement projections 24 are provided. 25 and engagement projection 26 (second fitting projection) 26 are guide surfaces 8
And the engaging protrusions 28a and 28b ( second guide engaging portions ). Also, the guide grooves 27a, 27b
( First guide engagement portion ) and engagement protrusions 28a, 28b ( second
Since each of the guide engagement portions is formed in the sliding direction of the slider 12, the slider 12 is surely guided in this sliding direction. Therefore, the shutter 5 can be smoothly guided to the case 1 via the slider 12 in the sliding direction.

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 the extended portion 22 of the slider 12 has the role of the protruding portion, thereby simplifying the portion of the shutter 5 to which the slider 12 is attached. And
This disk cartridge can be downsized.

[0021]

As described above, according to the present invention, the engagement protrusions are formed at both ends in the sliding direction of the slider made of synthetic resin, and the engagement protrusions are slidably engaged. Since the guide engagement portion is formed on the disk cartridge, the shutter slides smoothly on the case via the slider, and is reliably guided in the sliding direction.
In addition, since the slider is formed by extending an extended portion to which the opening / closing pin can contact from a portion where the shutter is attached, the shutter can be opened and closed by bringing the opening / closing pin into contact with the extending portion. 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 disk cartridge can be downsized.

[Brief description of the drawings]

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

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

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

FIG. 4 is a perspective view of a slider.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

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

FIG. 7 is a partially enlarged sectional view of the disk cartridge.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is an explanatory diagram of a state of a guide unit when a shutter is opened.

FIG. 10 is a perspective view showing a conventional disk cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 3 ... Head insertion hole 5 ... Shutter 12 ... Slider 22 ... Extension part 23, 24 ... Engagement protrusion part 27a, 27b ... Guide groove 28a, 28b ... Engagement protrusion part (guide engagement part)

Claims (5)

(57) [Claims] 1. A case containing a disk-shaped recording medium
(1) and a head insertion hole (3) formed in this case
To open and close this head insertion hole with an open / close pin
Shutter (5), attached to the shutter,
Sliding in the opening and closing direction of the shutter makes contact with the case.
A disc cart with a touching slider (12)
In the ridge, the shutter (5) is a recording / reproducing device of the case (1).
The cross section having a bent portion (5a) located on the insertion side
The slider (12) is bent in the shape of a letter, and the slider (12) is formed in the bent portion (5a).
Shutter support which is located on the surface side and secures the shutter (5)
Holding part (21) and shutter closing of the bent part (5a)
The shutter support portion (2
An extension portion (22) extended from 1) and the shutter
(5) Make contact with the open / close pin when moving in the opening direction
Contact projection formed at the tip of the extension (22)
(25) A disk cartridge having:
Judge. Wherein said shutter supporting portion shutter (21)
The disk cartridge according to claim 1, wherein an elastic member (14) for urging the shutter (5) in the closing direction is engageable with the opening-side end . Wherein said abutment projections (25) second engagement projection through the arm portion and the arm portion below the (26) is integrally formed, the second engagement projection (26 ) Is the case
The sliding guide is engaged with a second guide engaging portion (28a, 28b) formed on the inner wall surface of (1) in the sliding direction of the slider. A disc cartridge according to claim 1. 4. The shutter of the shutter support section (21).
A pair of first fitting protrusions (23a, 23a)
b) are formed, and these first fitting protrusions (23a,
3b) a first guide engaging portion (27a, 27b) formed on the inner wall surface of the case in the sliding direction of the slider.
4. The slidable engagement with the slab.
The disk cartridge according to any one of the above. 5. The shutter of the shutter support section (21).
The shutter (5) is urged in the closing direction at the opening side end.
While the elastic member (14) is engaged, The shutter
A pair of first fitting protrusions formed at the end in the opening direction
One (23b) of the (23a, 23b) is
When the shutter (5) is fully opened, the elastic member (14)
The length of the shutter opening direction side so that the arm (14b) does not collide
Is shorter than the other first fitting protrusion (23a).
5. The disk according to claim 4, wherein the disk is formed.
cartridge.