JPH0789431B2 - Disk cassette device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a disc cassette containing a disc-shaped recording medium, and more particularly to a disc cassette having an automatic shutter system suitable for dust-proof and fingerprint-proof measures, and an apparatus using the same. .

[Background of the Invention]

As described in Japanese Utility Model Laid-Open No. 59-138062, a conventional disk cassette has a head insertion window formed in a case accommodating a flexible magnetic disk, and the head insertion window is opened at one side of the case when used. , A shutter member that closes the head insertion window when not in use is slidably mounted,
On one side, the case is engageably engaged with an engagement hole formed in the shutter member, and abuts a stopper formed on the shutter member in a state of being engaged with the engagement hole. The lock claw is formed so as to prevent movement in the unlocking direction, and the lock claw is displaced in the direction in which the contact with the stopper is first released by the release member contacting the lock claw during use. The shutter lock mechanism has the first cam portion and the second cam portion that is then displaced in the direction to release the engagement with the engagement hole. In such a shutter lock mechanism, the engagement with the shutter member is released by pressing the lock claw with a pointed object such as a pencil or a ballpoint pen or the nail of a finger, and the movement of the shutter member becomes free. Even if the cassette was not loaded in the drive, the head insertion window would open and be left open. Further, the lock claw is significantly worn due to sliding with the stopper, and cannot be engaged during repeated engagement, so that the shutter member cannot close the head insertion window and the head insertion window is left open. There was an occasion.

In addition, a head insertion window is formed in a case accommodating a disk-shaped recording medium, and a shutter member that opens the head insertion window when used and closes the head insertion window when not in use is slidable on one side of the case. Attach the spring with one end locked to the shutter member and the other end locked to the case,
There is a disk cassette arranged so that the shutter member always biases the head insertion window in a direction to close the head insertion window. In this conventional disc cassette, the shutter member is formed in a U-shape, and the head insertion window is covered from the outside of the case. Therefore, the shutter member can be directly gripped and slid. Therefore, the head insertion window is easily opened. Dust, fingers, pencils, and sticks can easily enter the open head insertion window, and the precious magnetic disk is easily damaged. In addition, the actual development Sho 59-506
There are known examples in which a shutter lock mechanism and a spring are used in combination, as described in JP-B No. 2, JP-A No. 59-60779 and JP-A No. 59-60780. In these known examples, a tension coil spring is used as the spring, and the shutter member is always biased in the direction of closing the head insertion window. On the other hand, the shutter lock mechanism has a structure that locks the shutter member at a position where it is opened. In these known examples, since the shutter member is locked at the open position of the shutter member, the shutter member may be left open when the disc cassette is left alone. In this case, the shutter member is biased by the spring, and the head insertion window is closed whenever it is unnecessary, which defeats the purpose of the automatic shutter for preventing the adhesion of dust and fingerprints. Furthermore, since a tension coil spring is used as the spring,
It had the drawback that it was not suitable for the small and thin disc cassettes. That is, the maximum amount of elongation δ that can withstand repeated use of the tension coil spring is the applied force P, the wire diameter d, and the number of turns N.
And the coil diameter D and the lateral elastic modulus G of the wire are expressed by the following equation. That is, δ = 8PND ³ / Gd ⁴ , and the elongation amount δ is proportional to the product of the number of turns N and the cube of the diameter D. Therefore, the elongation amount δ is equal to the movement amount of the shutter member. Therefore, when a large movement amount is required as the movement amount of the shutter member, it is necessary to increase the number of turns N or the diameter D. is there. If the number of turns N is increased, the lateral width of the shell (case) is increased, and conversely, if the number of turns is increased, the thickness of the shell is increased. Therefore, it is understood that the use of the tension coil spring as the spring for urging the shutter member having a large amount of movement is not suitable for making the disc cassette small and thin.

[Object of the Invention]

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to ensure that the magnetic disk is safely stored and used, the head insertion window is opened only after the magnetic disk is mounted in the drive device, and the magnetic disk is removed from the drive device and smoothed at the same time. Small size with a shutter member opening / closing mechanism for closing the head insertion window
An object of the present invention is to provide a thin disc cassette and a device using the same.

[Outline of Invention]

In order to achieve the above object, in the present invention, a disk is contained in a substantially rectangular case, and the shutter member is moved by the restoring force of a torsion coil spring arranged at the corner of the case to close the head insertion window. , A disk cassette configured to hold the shutter member in this state by locking means, and applying and releasing a first external force to the locking means by mounting and moving the cassette, and a second to the shutter member. And a drive device equipped with a means for applying an external force, wherein the locking means is arranged at a corner portion of the case at a position where it does not planarly overlap the torsion coil spring. The fixed arm member is elastically displaced (first displacement) along the plane of the case by the first external force to release the engagement holding by the lock portion, The shutter member is configured to be displaced back (second displacement) by elastic restoring force after the release, and the shutter member is linearly moved along one edge of the case against the restoring force of the torsion coil spring by the second external force. The head insertion window is opened, and the locking means is provided for the linear movement of the torsion coil spring at the movable-side end of the torsion coil spring arranged on the shutter member side, which accompanies the movement of the shutter member. The second displacement operation of the arm member is performed so as to overlap in time.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1 (a), (b) and FIG. The present embodiment is a disk cassette including a disk-shaped recording medium 9 rotatably inserted in the shell 1, a shutter member 2, a torsion coil spring 5, and a lock claw 6. The shell 1 is composed of an upper shell 1a and a lower shell 1b, and both shells are fixed at the peripheral portion by ultrasonic welding or a fixing agent. Shell one has
Positioning holes for positioning the shell 1 in the drive device 24 when the shell 1 is loaded in the drive device 24
And 16 are opened perpendicular to the page. Further, a hub drive hole 26 is formed substantially at the center, and the head insertion window 8 is eccentrically formed so as to penetrate the upper and lower shells 1a and 1b and perpendicularly to the paper surface. Further, inside the shell 1, there is provided a counter 13 for displaying the number of recorded tracks. The disk-shaped recording medium 9 is a flexible disk made of polyethylene terephthalate having a thickness of about 50 μm and an outer diameter of 47 mm, coated with a magnetic material, and a hub 10 having a non-circular center opening 11 is fixed in the center thereof. ing. On the disc-shaped recording medium 9, a radius of 15 mm to 20 mm and a pitch of 100 μm, approximately 60 μm.
Magnetic tracks of width are recorded at equal intervals. One field image is recorded on one track, and two tracks form one frame. Therefore, 25 frame images are recorded on one disk-shaped recording medium 9. The counter 13 indicates this number and the number of recorded tracks by the cutout portion 27. The counter 13 includes a gear 28, a gear stopper 23, and a push rod 22 that pushes the gear stopper 23 against the gear 28.
And a leaf spring 21 for urging the pressing rod 22 downward. These counter mechanisms are arranged inside the shell 1. The shutter member 2 is formed by bending a stainless plate having a thickness of approximately 0.2 mm into a U-shape, straddling the shell 1 in a crotch shape, and sliding on the shutter member slide portion 12. As shown in FIG. 3, the shutter member 2 is provided with a projection 30 that is deeply drawn so as to project toward the inside of a U-shape, and a retainer 31 that is also bent toward the inside of the U-shape. The projection 30 and the retaining member 31 are fitted into the guide groove 29 provided in the shell 1b to prevent the shutter member 2 from coming off from the shell 1 and at the same time obtain a smooth activity. An engaging portion 3 and a locking portion 4 are formed on the back of the shutter member 2 by bending toward the inside of the shutter member 2. The engaging portion 3 and the locking portion 4 are both shells 1.
It projects into the guide groove 14 formed on the end surface of the shell and does not contact the shell 1. The engaging portion 3 engages with the recess 7 of the lock claw 6 inserted inside the shell 1. The lock claw 6 is entirely made of plastic, one end is non-rotatably supported by the shell 1 at two points 6a and 6b, the other end is a free end 6c, and a recess 7 is provided at the end.
The free end 6c has elasticity and is bent by receiving an external force, so that the shell 1
Move inside. When the shutter member 2 slides to a position that covers the head insertion window 8, the engaging portion 3 of the shutter member 2
Fits into the recess 7 and cannot be removed. Therefore, the movement of the shutter member 2 is blocked at the position where it covers the head insertion window 8. The locking portion 4 of the shutter member 2 is engaged with one end 17 of the torsion coil spring 5, and the other end of the torsion coil spring 5 is engaged.
18 is inserted into the blind groove 19 of the shell 1 and abuts against the inner wall thereof. The torsion coil spring 5 has a wire for spring having a diameter of about 0.5 mm, and has a two-turn coil portion formed at the center thereof, and both end portions 17 and 18 are 90 ° in the axial direction of the coil portion and in opposite directions.
It is bent. The torsion coil spring 5 is inserted inside the shell 1, and as described above, the end portion 18 is rotatably supported by the groove portion 19 and the other end 17 is rotatably supported by the engaging portion 4 of the shutter member 2. . The central coil portion is not supported. The torsion coil spring 5 is flexed and inserted into the shell 1 to urge the shutter member 2 so that the end of the shutter member 2 abuts on the bank 33 of the shutter member slide portion 12 and stops. . The shutter member 2 completely covers the head insertion window 8 with the end of the shutter member 2 in contact with the bank 33. Therefore, the torsion coil spring 5 used in this embodiment is a spring in which bending stress is generated in the central coil portion and both arm portions.

Next, the opening / closing operation of the shutter member 2 will be described with reference to FIGS.
It will be described with reference to the drawings. FIG. 4 shows a state in which the disc cassette is being inserted into the drive device 24. Drive device
The protrusion 25 of 24 is fixed to the drive device 24. As the disc cassette is inserted, the protrusion 25 slides in the guide groove 14 and first pushes the back portion of the free end 6c of the lock claw 6 to bend the free end 6c, thereby engaging the recess 7 and the engaging portion 3 of the shutter member 2 with each other. To disengage from. Next, the protrusion 25 contacts the shutter member 2 and stops the movement of the shutter member 2. When the disc cassette is further inserted, the disc cassette receives the reaction force of the torsion coil spring 5 and receives the force opposite to the insertion direction of the disc cassette. Torsion coil spring 5
When the disc cassette is inserted by resisting the reaction force of, the shutter member 2 is stopped by the projection 25, and as the disc cassette is inserted, the head insertion window 8 starts to open as a relative movement. At this time, the torsion coil spring begins to bend, and the central coil portion makes an arc motion in the arrow direction. Fig. 5 shows a disk cassette drive device
Shown fully inserted in 24. At this time, the projection 25 causes the shutter member 2 to slide on the shutter member slide portion 12 of the shell 1, and the shutter member 2 moves to the vicinity of the other bank 34 of the shutter member slide portion 12,
The torsion coil spring 5 is maximally deflected, and the head insertion window 8 is completely opened. Two positioning pins 20 and 32 stand on the drive device 24 and engage with the positioning holes 15 and 16 of the disk cassette to position the disk cassette in the drive device 24.

When the disk cassette is ejected from the drive device 24, the disk cassette is pushed out of the drive device 24 by the reaction force of the torsion coil spring 5 provided inside the shell 1, and at the same time, the shutter member 2 closes the head insertion window 8. . When the disc cassette is taken out from the drive device 24, the engaging portion 3 of the shutter member 2 is depressed 7 in the lock claw 6.
To prevent the shutter member 2 from moving.

〔The invention's effect〕

According to the present invention, a reliable closing operation of the shutter member is ensured, a reliable lock is performed at the closed position, and the entry of dust is prevented.
It is possible to obtain effects such as reduction in size and thickness of the entire disc cassette and prevention of contamination and damage of the disc.

[Brief description of drawings]

FIG. 1 (a) is a top view of an embodiment of the present invention, and FIG. 1 (b).
Is a front view of an embodiment of the present invention, FIG. 2 is an exploded configuration diagram of the embodiment of the present invention, FIG. 3 is a rear view of the embodiment of the present invention, and FIGS. 4 and 5 are embodiments of the present invention. FIG. 7 is an operation explanatory diagram of FIG. 1 ... Shell, 2 ... Shutter member, 3 ... Engagement part,
4 ... Locking part, 5 ... Torsion coil spring, 6 ... Lock claw, 7 ... Dimple, 8 ... Head insertion window, 9 ... Disk recording medium, 14 ... Guide groove, 15, 16 ... … Locating holes, 24
...... Drive device, 25 …… Protrusion.

Continuation of the front page (56) Reference JP-A-58-169379 (JP, A) JP-A-60-52979 (JP, A) Actually opened Sho-58-49366 (JP, U) Actually opened 59-45780 (JP , U) Actual development Sho 59-177073 (JP, U) Actual development Sho 58-49366 (JP, U)

Claims (1)

[Claims] 1. A disk is contained in a substantially square case, and a shutter member is moved by a restoring force of a torsion coil spring arranged at a corner portion of the case to close a head insertion window,
A disk cassette having a structure in which the shutter member is engaged and held by the locking means, and a mounting movement of the cassette applies and releases a first external force to the locking means, and a second external force to the shutter member. A disc cassette device combining a drive device having a means for applying an external force, wherein the locking means is arranged at a position where it does not planarly overlap with the torsion coil spring at a corner portion of the case and one end side is The fixed arm member is elastically displaced (first displacement) along the plane of the case by the first external force to release the engagement and holding by the lock portion, and after the release, the elastic restoring force causes the return displacement (second displacement). The shutter member is linearly moved along one edge of the case against the restoring force of the torsion coil spring by the second external force, and the shutter member The lock insertion lock is locked to the linear movement of the torsion coil spring at the movable side end of the torsion coil spring arranged on the shutter member side in accordance with the movement of the shutter member. A disk cassette device, characterized in that the second displacement operation of the arm member of the means is performed so as to overlap in time.