JPH0740422B2 - Disco Cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a shutter for closing a window hole formed in a cartridge case when not in use to prevent foreign matter from entering through the window hole. Regarding the attached disc cartridge.

[Conventional technology]

The disk-shaped recording medium housed in the cartridge case is mounted on the recording / reproducing apparatus, and the disk cartridge for recording / reproducing information by magnetic means or optical means includes a spindle for rotating the disk-shaped recording medium,
A window hole is provided for inserting a recording / reproducing head for exchanging information with the disk-shaped recording medium.

Therefore, if the window hole is always opened, dust may adhere to the disk-shaped recording medium when not in use, or fingers or foreign matter may come into contact with the disk-shaped recording medium when handling the disk-shaped recording medium. The surface may be soiled or damaged.

In order to prevent such an accident, there has conventionally been a disk cartridge which is provided with a shutter for closing the window hole when not in use to prevent foreign matter from entering.

FIG. 9 to FIG. 11 show an example of this kind of disk cartridge which the applicant of the present invention has previously proposed (Japanese Patent Laid-Open No. 61-258381).
Issue).

This disk cartridge 30 is, as shown in FIG.
Mainly, a synthetic resin cartridge case 31, a double-sided recording type disc-shaped recording medium 32 rotatably accommodated in the cartridge case 31, a front edge of the cartridge case 31, that is, a recording / reproducing device. A slider 33 movably mounted along the insertion side, a shutter 34 for opening and closing a window hole formed in the cartridge case 31, and a distal end of the shutter 34 movably held in the cartridge case 31. It is composed of a pressing plate 35 and

The cartridge case 31 is an upper case 36 and a lower case 37.
By joining the two cases 36, 37 with a plurality of joining screws (not shown), a space for accommodating the disk-shaped recording medium 32 and other necessary components is formed. ing.

The upper case 36 and the lower case 37 are provided with a window hole 39 penetrating from the substantially central portion corresponding to the rotation center P of the disk-shaped recording medium 32 to the front edge 38, and through the window hole 39. On one side of the front edge 38, a fitting portion 40 of the slider 33, which will be described in detail later, is formed. A guide bar 41 made of a metal round bar is bridged at both ends of the fitting portion 40, and reinforcements made of hard synthetic resin are provided on both sides of the window hole 39 inside the guide bar 41. The member 42 is bridged.

The slider 33 has a synthetic resin material having excellent lubricity, such as nylon, tetrafluoroethylene, polyethylene, polyacetal, or polypropylene, and can be fitted to the fitting portion 40 formed on the cartridge case 31. It is formed in a rectangular parallelepiped shape, and a through hole 43 through which the guide bar 41 can be inserted is formed in the center of the side surface thereof. Also,
At the center of the front surface of the slider 33, a groove that vertically penetrates is formed.
44 is recessed, and further, screw holes for screwing a shutter 34, which will be described in detail later, are formed at both ends of the front surface of the slider 33.
45, 45a are formed.

As shown in FIG. 9, the slider 33 is slidably attached to the fitting portion 40 of the cartridge case 31 by penetrating the guide bar 41 through the through hole 43, and the guide bar 41 By the return spring 33a wound around the
The shutter 3 is always urged in the closing direction.

As shown in FIG. 9, the shutter 34 is formed by bending a thin metal plate such as stainless steel into a U-shape,
Upper piece 34a and lower piece 34b having a width and a length capable of covering 39
And a front piece 34c having a width substantially equal to the thickness S of the cartridge case 31 are formed. The front piece 34c has a through hole corresponding to the groove 44 formed in the slider 33.
46 and screw insertion holes 47, 47a corresponding to the screw holes 45, 45a opened in the slider 33 are opened.

In this shutter 34, the upper piece 34a and the lower piece 34b are brought into contact with the front and back surfaces of the cartridge case 31, respectively, and the front piece is
34c is brought into contact with the front surface of the slider 33, and the groove 44 and the through hole 4
6 and the screw holes 45, 45a and the screw insertion holes 47, 47a, respectively, and then the screw holes 4 from the outside of the screw insertion holes 47, 47a.
The cartridge case 31 is integrated by screwing a screw (not shown) to the 5,45a. The distal end of the shutter 34 is movably held by attaching an elongated holding plate 35 to the cartridge case 31.

FIG. 10 is a front view of the state in which the above-described conventional disk cartridge 30 is inserted into the recording / reproducing apparatus as viewed from the inside of the recording / reproducing apparatus. As shown in this figure, when the disk cartridge 30 is inserted into the recording / reproducing apparatus, for example, when the disk recording medium 32 is inserted with the recording surface A on the recording / reproducing head side, Of the two shutter opening / closing levers 48, 48a provided inside, the engaging pin 49 of the A-side shutter opening / closing lever 48 is recessed in the slider 33 through the through hole 46 formed in the shutter 34. Inserted inside.

When the disk cartridge 31 is further inserted into the recording / reproducing apparatus, as shown in FIG. 11, the disk cartridge is inserted.
By the inserting force of 31, the A-plane shutter opening / closing lever 48 is rotated in the direction of the arrow (a) about a fulcrum not shown,
Along with this, the shutter 34 (slider 33) moves the return spring.
Moved in the direction of arrow (b) against the elasticity of 33a,
9 is open. The engaging pin 50 of the B-side shutter opening / closing lever 48a is, as shown in FIG. 10, a front piece 34 of the shutter 34.
c Slide on.

Next, another example of this type of known disk cartridge will be described with reference to FIGS. 12 to 14 (Act. 58-35181).

In FIG. 12, 51 is a disk cartridge, 52 is a cartridge case, 53 is a window hole, 54 is a shutter, and 55 is a holding plate.

As shown in FIG. 12, at the front edge of the cartridge case 52, at least at a position slightly deviated in the returning direction (direction of arrow C) of the shutter 54 from OO of the center line of the window hole 53. A recessed portion 56 longer than the required movement amount of the shutter 54 is formed. A slit 57 for holding the shutter 54 movably is provided on the surface of the cartridge case 52 slightly inward of the recessed portion 56.

As shown in FIG. 13, the shutter 54 has an upper piece 54a having a width and a length capable of covering the window hole 53 of the cartridge case 52.
And a lower piece 54b and a front piece 54c having a width substantially equal to the thickness S of the cartridge case 52. When the shutter 54 is set at the window hole closing position of the cartridge case 52, the front piece 54c is located at the end on the return side from the center line YY corresponding to the center line OO of the grandchild hole 53. Piece 54b
A notch 57 is formed that connects to. A claw piece 58 is erected inwardly of the upper piece 54a and the lower piece 54b near the front piece 54c. In this shutter 54, the upper piece 54a and the lower piece 54b are brought into contact with both the front and back surfaces of the cartridge case 52, the claw pieces 58 are fitted in the slits 57 recessed in the cartridge case 52, and the tip portion is pressed down. By holding the plate 55,
It is movably attached to the cart case 52.
Although not shown, the shutter 54 is always provided with a window spring by a return spring provided in the cartridge case 52.
It is urged in the closing direction of 53.

As shown in FIG. 14, the disk cartridge 51 of the conventional example described above is provided in the recording / reproducing apparatus when the A recording surface of the disk-shaped recording medium is inserted into the recording / reproducing apparatus with the recording / reproducing head side facing the recording / reproducing apparatus. Shutter opening / closing lever 59 for A side
The engaging pin 60 is engaged in the notch 57 of the shutter 54, and the shutter 54 is opened by the rotation of the A-side shutter opening / closing lever 59 accompanying the insertion force f ₁ of the disk cartridge 51.
At this time, the engaging pin of the B-side shutter opening / closing lever 61
62 is engaged with the front edge of the cartridge case 52, rides on the front piece 54c of the shutter 54 as the shutter 54 moves, and slides on it.

[Problems to be solved by the invention]

Of the above-mentioned conventional disk cartridges, the disk cartridge of the first conventional example shown in FIGS. 9 to 11 has an end surface of the slider 33 and a side wall of the cartridge case 31, as shown in FIG. Since the void C is formed between the gaps, there is a problem that a foreign substance is caught in the void C or the foreign substance is apt to collide with the corner portion of the shutter 34, which causes an abnormal operation of the shutter 34. It's been found.

Further, since the engaging pins 49, 50 of the shutter opening / closing levers 48, 48a are inserted into the concave groove 44 from the upper one side or the lower one side of the shutter 34, as shown in FIG. 10, the shutter opening / closing lever 48, The set width D of 48a becomes larger than the thickness S of the disk cartridge storage case, and there is a problem that it is not possible to meet the demand for thinner recording / reproducing apparatus.

Further, in the disk cartridge of the second conventional example shown in FIGS. 12 to 14, since the notch 57 is formed in the vicinity of the return side end of the shutter 54, as shown in FIG. , The set angle θ of the shutter opening / closing levers 59, 61 with respect to the inserting direction of the disk cartridge 51 becomes small, and the component force in the moving direction of the shutter with respect to the inserting force f ₁ of the disk cartridge 51.
f ₂ becomes smaller. Therefore, a large insertion force is required to move the shutter 54, and there is a problem that the usability is poor.

Moreover, since a large insertion force is required, the impact force when the front edge of the disk cartridge latch collides with the shutter opening / closing levers 59, 61 is large, and the engagement pin of the other shutter opening / closing lever is There is also a problem in that it is not preferable in use from this point as well, since there is an impact even when riding over the edge.

[Means for solving problems]

The present invention has been made in order to solve all the problems of the above-mentioned prior art, and enables the shutter to be opened and closed with a small insertion force, and at the same time, reduces the impact at the time of insertion, so that the shutter is not When in the closed position of the hole,
Dealing with the requirement to open a hook hole for engaging the opening / closing lever in a region closer to the moving direction of the shutter than the position corresponding to the center line of the window on the front piece of the shutter, and to make the recording / reproducing device thinner. Therefore, the hook hole is formed narrower than the front piece of the shutter.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, the outline of the structure of the disk cartridge according to the present embodiment will be described with reference to FIG. 1. The disk cartridge 1 is mainly composed of a synthetic resin cartridge case 2 and a rotatable cartridge case 2. A double-sided recording type disc-shaped recording medium 3 housed in a disk, a slider 4 slidably attached to the front edge of the cartridge case 2, and a shutter 4 attached to the slider 3.
And a holding plate 6 that movably holds the tip portion of the shutter 4 in the cartridge case 2.

The cartridge case 2 has exactly the same basic structure as the above-mentioned conventional cartridge case, and is composed of a shallow dish-shaped upper case 7 and a lower case 8. By joining with a joining screw (not shown), a space for accommodating a predetermined component such as the disk-shaped recording medium 3 is formed.

As shown in FIG. 2, on the inner surfaces of the upper case 7 and the lower case 8, a joining wall 9 having a constant height is provided upright on the peripheral edges except the leading edge portion, and the joining wall 9 is attached to the leading edge portion. A guide ridge 10 lower than the wall 9 is erected in a straight line. Also, the upper case 7
On the inner peripheral portions of the joint wall 9 and the guide ridge 10 of the lower case 8, a partition wall 11 having the same height as the joint wall 9 is erected in a substantially circular shape. Further, the upper case 7 and the lower case 8 are provided with a window hole 12 for inserting the spindle and the recording / reproducing head from the substantially central portion to the front edge portion.

As shown in FIG. 3, the shutter 5 is formed by bending a thin metal plate such as stainless steel into a U-shape, and has a width and a length capable of covering the window hole 12 formed in the cartridge case 2. And a front piece 5c having a width approximately equal to the thickness of the cartridge case 2. The front piece 5c side of the upper piece 5a and the lower piece 5b is formed wider than the front end portion by extending the side of the return side at a right angle, and is formed with the front edge of the cartridge case 2. By increasing the contact length, stability during operation is improved. When the shutter 5 is set at the window hole closing position of the cartridge case 2,
A through hole 13 having a width narrower than the width of the front piece 5c is formed at the end of the front piece 5c located on the moving side of the center line YY corresponding to the center line OO of the window hole 12. .

The through hole 13 may be provided on the moving side of the center line Y-Y, but in order to smoothly operate the shutter 5, the through hole 13 should be opened at a position as close as possible to the end on the moving side. preferable. Incidentally, reference numerals 14 and 14a in the drawing indicate screw insertion holes.

As shown in FIG. 4, the slider 4 is formed in a prismatic shape having a length substantially equal to the width of the tip of the upper piece 5a or the lower piece 5b of the shutter 5, and the sliders 4 are arranged at symmetrical positions on the upper and lower surfaces thereof. Is a guide ridge 10 that is erected on the cartridge case 2.
A recessed groove 15 is formed in which can be fitted. Further, on the front surface of the slider 4, there are hook holes 16 corresponding to the through holes 13 formed in the shutter 5, and screw holes 17, 17a corresponding to the screw insertion holes 14, 14a formed in the shutter 5. Opened.

The slider 3 is made of any material such as a synthetic resin having excellent lubricity such as nylon, tetrafluoroethylene, polyethylene, polyacetal or polypropylene, or a metal having excellent lubricity.

The slider 4 is slidably attached to the front edge of the cartridge case 2 by arranging the groove 15 on the guide ridge 10. Further, the shutter 5 includes an upper piece 5a and a lower piece.
5b are superposed on both sides of the cartridge case 2, respectively, and the rear surface of the front piece 5c is brought into contact with the front surface of the slider 4 to form a through hole.
13 and hook hole 16, screw insertion holes 14,14 and screw holes 17,17
After matching a, from the outside of the screw insertion holes 14, 14a, screw 18,
By screwing 18a into the screw holes 17 and 17a, it is fixed to the stider 4. Further, the tip portion of the shutter 5 is movably held by the pressing plate 6 in the cartridge case 2.

As shown in FIG. 6, the disk cartridge 1 of the above embodiment is a recording / reproducing apparatus in which two shutter opening / closing levers 19, 19a are set to have a width D narrower than the thickness S of the disk cartridge 1. Applied. Then, as shown in this figure, when the disk cartridge 1 is inserted into the recording / reproducing apparatus, for example, when the disk-shaped recording medium 3 is inserted with the recording surface A on the recording / reproducing head side, Of the two shutter opening / closing levers 19 and 19a provided in the device, the engaging pin 20 of the A-side shutter opening / closing lever 19 is a through hole.
It is inserted from the front side of 13.

When the disk cartridge 1 is further inserted into the recording / reproducing apparatus, as shown in FIG. 5, the insertion force f ₁ of the disk cartridge 1 causes the A-side shutter opening / closing lever 19 to rotate about the fulcrum. Along with this, the shutter 5 is moved to the right in the figure and the window hole 12 is opened.

As shown in FIG. 5, the disk cartridge 1 of the above embodiment has the center line O of the window hole 12 in the closed position of the window hole 12.
Since the hook hole 16 is formed in the region in the moving direction of -O, the set angle θ of the shutter opening / closing levers 19, 19a with respect to the inserting direction of the disk cartridge 1 can be increased. Therefore, the component force f _{2 in the} shutter opening direction with respect to the insertion force f ₁ of the disk cartridge 1 becomes large, and the shutter 5 can be opened and closed with a small insertion force. Also,
Since the insertion force f ₁ of the disk cartridge 1 is small, the disk cartridge 1 is inserted when the disk cartridge 1 is inserted.
The impact force generated by the front edge of the colliding with the shutter opening / closing levers 19, 19a is small, and the usability is excellent. further,
The drive pin of the other shutter opening / closing lever which is not engaged with the hook hole 16 always slides on the front edge 5c of the shutter 5, so that no uncomfortable impact is generated from this portion. Further, the set width D of the two shutter opening / closing levers 19 and 19a can be made smaller than the thickness S of the disk cartridge 1 so that the recording / reproducing apparatus can be made thin.

In the above embodiment, the case where the return spring for urging the shutter in the closing direction of the window hole is not provided has been described, but the gist of the present invention is not limited to this, and as shown in FIG. The slider 5 and the cartridge case 2
It is also possible to stretch the return spring 22 between them. In this case, the operation of the shutter 5 becomes more reliable, and the shutter 5 is less likely to open when not in use, and the dustproof effect of the shutter 5 can be improved.

Further, as shown in FIG. 8, the flexible stopper 23 in the cartridge case 2 is fixed, and the stopper engaging portion 24 is formed on the side of the slider 4 facing the stopper 23, and the window hole 12 is formed. The slider 4 at the closed position,
It can also be configured to be fixed at 23. In this case, the fixing of the shutter 5 at the window hole closing position becomes more reliable, and the dustproof effect of the shutter 5 can be further enhanced.

Further, in the above embodiment, the case where the spendle hole and the head insertion hole are formed in series has been described, but it goes without saying that these window holes can be formed differently.

Further, in the above-described embodiment, the case where the shutter 4 and the slider 3 are screwed together has been described, but the gist of the present invention lies in the point that both members are fixed. The fixing means can also be used.

〔The invention's effect〕

As described above, the disk cartridge according to the present invention forms the hook hole closer to the moving direction of the shutter than the position corresponding to the center line of the window hole of the front piece of the shutter when the shutter is in the closed position of the window hole. Therefore, the opening / closing force of the shutter can be reduced, and the impact at the time of insertion can be mitigated. Further, since the hook hole is formed narrower than the front piece of the shutter, the recording / reproducing apparatus can be made thin.

[Brief description of drawings]

1 to 6 show one embodiment of the present invention, FIG. 1 is a perspective view of a disk cartridge, and FIG. 2 is a plan view showing the inner surface structure of an upper case and a lower case. 3 is a perspective view of the shutter, FIG. 4 is a perspective view of the slider, and FIG.
The figure is a partially cutaway plan view for explaining the effect of the present invention.
The drawing is a front view showing the positional relationship between the disk cartridge and the shutter opening / closing lever. FIG. 7 is a partially cut plan view showing a second embodiment of the present invention, and FIG. 8 is a partially cut plan view showing a third embodiment of the present invention. 9 to 11 show a first conventional example, FIG. 9 is an exploded perspective view of a disk cartridge, and FIG. 10 is a partially cutaway perspective view showing the operating principle of a shutter. FIG. 11 is a front view showing the positional relationship between the disk cartridge and the shutter opening / closing lever. FIGS. 12 to 14 show a second conventional example. FIG. 12 is a plan view of a disk cartridge with the upper piece of the shutter removed, and FIG. 13 is a perspective view of the shutter. FIG. 3 is a partially cutaway plan view showing a problem of this disc cartridge. 1: Disc Cartridge, 2: Cartridge case, 4: Slider, 5: Shatter, 5c: Front piece, 12: Hook hole, 19, 19a:
Shatter opening / closing lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuyoshi Koyama 1-1-88, Tora, Ibaraki-shi, Osaka Inside Hitachi Maxell Co., Ltd. (72) Inventor Annori Kanazawa 1-88, Tora, Ibaraki-shi, Osaka Hitachi Maxel Co., Ltd. (72) Inventor Yoshiyuki Nakamori 1-1-88, Tora, Ibaraki-shi, Osaka Prefecture Hitachi Maxell Co., Ltd. (72) Inventor Shinichi Abe 2880, Kozu, Odawara, Kanagawa Hitachi, Ltd. Odawara In the factory (72) Inventor Nobuyuki Fujimoto 2880, Kozu, Odawara, Kanagawa Stock company Hitachi Odawara factory (56) References JP 62-71054 (JP, A) JP 62-39266 (JP, A) ) JP-A-62-36468 (JP, A)

Claims (8)

[Claims] 1. A cartridge case, which comprises an upper case and a lower case and has window holes for inserting a spindle and a head on both sides, and a double-sided recording rotatably housed inside the cartridge case. Type disc-shaped recording medium and both the front and back windows can be opened and closed, and when any recording surface of the double-sided recording type disc-shaped recording medium is inserted into the recording / reproducing apparatus with the recording / reproducing head side facing the recording / reproducing head. Also,
In a disk cartridge including a shutter that moves in a predetermined direction from the closed position of the window hole,
When the shutter is in the closed position of the window hole, in the region closer to the moving direction of the shutter than the position corresponding to the center line of the window hole of the front piece of the shutter, the width is wider than the width of the front piece of the shutter. A disk cartridge which has a hook hole for engaging a narrow shutter opening / closing lever. 2. A slider provided with an opening / closing lever insertion hole at a position corresponding to a hook hole formed in the front piece of the shutter is provided movably along the front edge of the cartridge case.
By overlapping the opening / closing lever insertion hole opened in the slider and the hook hole opened in the shutter,
The disk cartridge according to claim 1, wherein the shutter is attached to the slider. 3. A disk car according to claim 1, wherein a shutter having a hook hole formed at a predetermined position is movably attached to the front edge of the cartridge case without using a slider. Trillium. 4. The disk cartridge according to claim 3, wherein a return spring for urging the shutter in the direction of closing the window is not provided in the cartridge case. 5. A disk according to claim 1, wherein a return spring for urging the shutter in the closing direction of the window hole is provided in the cartridge case. Cartridge. 6. An elastic member formed of a plastic, a base end portion of which is provided with a mounting means for fixing to a cartridge case, and a distal end portion of which is engaged with an engaging portion formed on a shutter or a slider. The disk cartridge according to any one of claims 1 to 5, further comprising: a stopper provided with a stoppable locking claw provided in the cartridge cartridge case. 7. A slotted window hole, in which a spindle hole for inserting a spindle and a head hole for inserting a recording / reproducing head are connected in series, is formed. The disk cartridge according to any one of claims 1 to 6. 8. A pair of window holes, a spindle hole for inserting a spindle and a head inserting hole for inserting a recording / reproducing head, are provided. The disk cartridge according to item 6.