JP2566995Y2 - 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.

[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 Examples of such a disk cartridge include those shown in FIGS. 8 and 9. In FIG. 8, reference numeral 101 denotes a case, in which a disk-shaped recording medium 106 is stored. The case 101 has a rotary hole 102 for rotating the disk-shaped recording medium 106 and a head insertion hole 103 for accessing the head for reading and writing information when the disk cartridge is mounted on the recording / reproducing apparatus. Have been.

Here, a shutter 104 is attached to the case 101 in order to prevent dust from entering the inside of the case 101 from the rotation hole 102 or the head insertion hole 103. As shown in FIG. 9, a spring receiving portion 108 is formed on the shutter 104, and the spring receiving portion 108 is engaged with one end of a torsion coil spring 107 housed in the case 101. When the open / close pin P is brought into contact with one end of the shutter 104 and slid, the rotation hole 102 and the head insertion hole 103 are opened.

[0004]

However, in such a conventional disk cartridge, since the metal shutter 104 is in direct sliding contact with the case 101, the shutter 104 can be smoothly moved with respect to the case 101. In addition, there is a problem that the shutter is difficult to slide, and furthermore, there is a problem that the shutter falls off the case due to an impact applied when the case is dropped.

Therefore, the bent portion 10 of the shutter 104
A slider (not shown) made of a synthetic resin having lubricity such as polyacetal is attached inside the shutter 4a.
04 can be slid with respect to the case 101 via this slider. A spring receiving portion must also be formed on the slider made of the synthetic resin. However, this spring receiving portion must be formed as an engagement groove in the slider because it needs to have a certain strength. Then, at the time of assembly, one end of the torsion coil spring 107 has to be fitted and engaged in the engagement groove, which causes a problem that it is complicated.

On the other hand, in order to read and write information from both sides of the optical disk 106, a pair of heads facing each other must be able to approach the head insertion hole 103 from the side of the disk cartridge. For that, the first
As shown in FIG. 0, a portion 104b of the shirt 104 on the side where the opening / closing pin P contacts must be cut out so as not to contact the pair of heads. Then, the strength of the notched portion 104b of the shutter 104 is reduced, and the shutter 104 may be plastically deformed when the shutter 104 is pressed and opened by the opening / closing pin P, and is vulnerable to an external impact.

[0007]

In order to solve such problems, the present invention provides a disk-shaped recording medium.
Case (1) in which (2) is stored, and this case (1)
Head insertion hole (3) and the rotation hole (4) for rotating the disc-shaped recording medium (2), the head insertion hole (3) and rotation holes (4) that open in the case formed in ( a cross-sectional U-shaped shutter (5) which is opened and closed by mounted closing pin (P) to 1), a spring (18) for biasing the shutter (5) to the closing direction, the the shutter (5) attached, and a slider (15) in contact sliding with respect to said casing (1), the spring (1
8) is engaged with the shutter (5) , and the slider (1 ) is engaged.
5) at one end thereof in the sliding direction of the slider (15) from the opposite side of the engagement position between the spring (18) and the shutter (5).
An extension portion (15a) extending along the extension portion (15a) is formed, and the opening / closing pin (P) comes into contact with the end of the extension portion (15a).
A contact portion (33) is provided , and the shutter (5) is provided with the spring
(18) The spring receiving part (17) for receiving the shutter (5)
And a disk cartridge formed integrally with the disk cartridge.

[0008]

When a disk cartridge is mounted on a recording / reproducing apparatus, an opening / closing pin of the apparatus pushes and slides a shutter to open the rotation hole and the head insertion hole. At this time, the shutter is not in direct sliding contact with the case, but is in sliding contact with the case via the slider. Therefore,
The shutter can be smoothly slid with respect to the case, and the slider can be reliably guided. In addition, since the urging member is engaged with the shutter, a portion of the shutter that engages with the urging member can be formed by being bent into a shape protruding from the surface. Therefore, when the disc cartridge is assembled, the urging member may be engaged with the protruding portion of the shutter. Further, since the shutter is opened and closed by bringing the opening / closing pin into contact with the extended portion of the slider, the extended portion of the slider can have a large sectional area regardless of the shutter. For this reason, the extended portion of the slider can have higher strength than when the shutter is extended.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIGS. 1 to 7 show an embodiment of a disk cartridge for 3.5 inches according to the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a case of a disk cartridge. The case 1 is made of a synthetic resin and is composed of an upper half 1a and a lower half 1b which are entirely rectangular and have a flat plate shape. ing. 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. 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. As shown in FIG. 3, the shutter 5 is formed by bending a thin metal plate of stainless steel or the like into a substantially U-shape from substantially the center, and an opening / closing plate portion 6 for opening and closing the rotary hole 4 and the head insertion hole 3. An auxiliary opening / closing plate portion 7 having a shorter bending length than the opening / closing plate portion 6 is provided. A guide plate portion 8 is formed at the bent portion (upper portion in the figure) of the shutter 5 at the end of the case 1 on the recording / reproducing device insertion side.

Here, the guide portion G formed at the leading end portion of the case 1 in which the recording / reproducing device is inserted is formed on the left side in the figure and falls from the upper end surface of the case 1 as shown in FIGS. Guide surface 11a, 1 extending horizontally
1b and the guide surfaces 11a and 11b are formed on the opposite side to the head insertion hole 3, and the guide step 12
a and 12b. And the guide surface 1
Between 1a, 11b and guide steps 12a, 12b,
A connecting portion 13 is formed. The first guide surface 11
On the head insertion hole 3 side of a and 11b, a recessed recess 14 is formed for the opening / closing pin P for opening and closing the shutter 5 to drop when the shutter 5 is opened. When the head insertion hole 3 is opened as described above, the opening / closing pin P
Falls into the escape recess 14.

A slider 15 made of a slippery synthetic resin such as polyacetal, which slides on the guide portion G, is attached to the inner surface of the guide plate portion 8 having a substantially U-shaped cross section.
That is, the front side of the slider 15 (the top side in FIG. 4)
Is formed with a substantially mortar-shaped first dent 25, and a substantially mortar-shaped second dent 26 that can be fitted into the first dent 25 is formed on the guide plate portion 8 of the shutter 5 by press working (so-called piercing press). Have been. When the first dent 25 and the second dent 26 are fitted, the slider 15 is positioned on the shutter 5. After this positioning, the first and second recesses 2
The sliders 15 are fixed to the shutter 5 by inserting the tapping screws 16 through the screws 5 and 26.

As shown in FIG. 6, the slider 15 has a pair of guide steps 12a formed on the case 1 for guiding the slider 15 in the sliding direction of the shutter 5.
12b. Since the slider 15 has lubricity as described above, the slider 15 slides smoothly on the guide steps 12a and 12b. In order to prevent the shutter 5 from coming off the case 1 when the shutter 5 slides, fitting claw portions 29 and 30 are formed on the shutter 5. Are fitted into guide grooves 31 and 32 formed in the sliding direction. on the other hand,
If the front and back sides of the disk cartridge are erroneously mounted on the recording / reproducing apparatus, the opening / closing pin P malfunctions. In order to prevent this malfunction, the upper and lower halves 1a and 1b have , Malfunction prevention wall 14
a, 14b are formed upward in FIG. Further, since one end 18a of the torsion coil spring 18 is located on the tip side (the upper end side in FIG. 6) of the malfunction prevention wall 14b, the height is set lower than the height of the malfunction prevention wall 14a.

The slider 15 fixed to the guide plate 8 of the shutter 5 is fixed so as to be slightly displaced leftward in FIG. 4 from the guide plate 8, so that the right end of the guide plate 8 is This means that the slider 15 is not located at that portion. Therefore, the first end of the guide plate 8 is
The spring receiving portion 17 is formed by press cutting and bending downward. A storage chamber 19 for storing the torsion coil spring 18 is provided in the case 1, and a second spring receiving portion 20 is formed in the case 1 at the upper right end of the storage chamber 19. One end and the other end of the torsion coil spring 18 are engaged with the first and second spring receiving portions 17 and 20, respectively, and the slider 15 is biased to the left in FIG.

On the other hand, a substantially left half of the slider 15 is extended leftward in FIG. 5 so as to be able to contact the opening / closing pin P as shown in FIG. The left end of the extended portion 15a is a contact portion 33 of the opening / closing pin P. In addition, this extension part 15
“a” is formed to be thin so that a pair of heads (not shown) of the recording / reproducing apparatus do not come into contact with each other even when approaching the head insertion port 3 from the side. A sliding contact surface portion 15b that slides on the guide surfaces 11a and 11b is formed on the left end side portion of the extension portion 15a of the slider 15, and the sliding contact surface portion 15b is formed on the guide surfaces 11a and 11b for the same reason as described above. 1
1b has lubricity.

4, a fitting projection 21 having a substantially barbed cross section is integrally formed at the left end of the extension portion 15a in FIG. The fitting protrusions 21 are press-fitted into fitting grooves 23 formed in the case 1 along the sliding direction, respectively, to prevent the slider 15 from easily coming off the case 1 when sliding. That is, the tip of the fitting projection 21 is more sharable than the opening / closing pin contact portion 33.
A protrusion 22 for preventing the slider from coming off, which is located on the side of the cutter closing position and below the escape recess 14, protrudes and engages with the rail 24 on the inner surface of the case. Therefore, even when the shutter is opened by the opening / closing pin P, the slider does not come off upward.

When the disk cartridge is mounted on the recording / reproducing apparatus, the opening / closing pin P of the apparatus is used to open the rotary hole 4 and the head insertion hole 3 at the upper left end of the extension 15a of the slider 15 in FIG. Part, and the shutter 5 is slid rightward. At this time, the shutter 5 is not in direct sliding contact with the case 1 but is in sliding contact with the case 1 via the slider 15. Therefore, if the shutter 5 is pressed by the opening / closing pin P, the shutter 5 can be slid smoothly with respect to the case 1.

The first spring receiving portion 17 with which the torsion coil spring 18 is engaged is not formed on the slider 15, but is formed by bending the guide plate portion 8 and protruding from this surface. . For this reason, when assembling the disk cartridge, one end of the torsion coil spring 18 may be engaged with the protruding first spring receiving portion 17.
This engagement can be performed much more easily than forming an engagement groove in the slider 15 and engaging the engagement groove with the engagement groove.

On the other hand, the slider 15 fixed to the shutter 5 is extended to the left in FIG. 5 so as to be able to contact the opening / closing pin P as described above, and the thickness of the extended portion 15a is reduced. However, the extended portion 15a can have a large cross-sectional area regardless of the shutter 5 made of a thin metal plate. For this reason, the strength of the extended portion 15a of the slider 15 is higher than when the guide plate portion 8 of the shutter 5 is extended and the extended portion is cut out. Therefore, even if the shutter 5 is opened and closed by pressing the extended portion 15a of the slider 15 with the opening / closing pin P, the extended portion 15a is not plastically deformed.

[0021]

As described above, according to the present invention, since the shutter is fixed to the slider, the shutter slides smoothly and can withstand a drop impact.
In addition, since the urging member is engaged with the shutter, the portion of the shutter that engages with the urging member can be formed by being bent into a shape protruding from the surface. For this reason, when assembling the disc cartridge, the urging member may be engaged with the protruding portion of the shutter. This engagement is achieved by forming an engagement groove in the slider and fitting the engagement member into the engagement groove. This can be performed much more easily than by engaging with the lever.

Also, since an extended portion is formed on the slider and an opening / closing pin is brought into contact with the extended portion to open and close the shutter, the extended portion of the slider has a large sectional area regardless of the shutter. Can be taken. For this reason, the extended portion of the slider can have higher strength than when the shutter is extended. Therefore, even if the shutter is opened and closed by pressing the slider with the opening / closing pin, the extended portion of the slider is not plastically deformed.

Further, since the spring has a spring receiving portion formed integrally with the shutter, the spring can be reliably received, and even if the shutter is subjected to a twisting action or the like by the spring, the slider can receive the spring. The extended portion appropriately guides the slider, so that the shutter can be opened and closed smoothly.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a disk cartridge according to an embodiment of the present invention.

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

FIG. 3 is a sectional view of a shutter.

FIG. 4 is a partially enlarged front view of a lower half of the disk cartridge.

FIG. 5 is a plan view of the disk cartridge.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 4;

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

FIG. 8 is a perspective view of a conventional disk cartridge.

FIG. 9 is a partially enlarged view of a conventional disk cartridge.

FIG. 10 is a perspective view of another conventional shutter that can be considered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Optical disk 3 ... Head insertion hole 4 ... Rotation hole 5 ... Shutter 15 ... Slider 15a ... Extension part 17 ... 1st spring receiving part 18 ... Torsion coil spring P ... Opening / closing pin

Claims (1)

(57) [Scope of request for utility model registration] 1. A case (1) in which a disk-shaped recording medium (2) is stored, a head insertion hole (3) formed in the case (1) and a disk-shaped recording medium (2). A shutter (5) having a U-shaped cross section which is opened and closed by a rotating hole (4) and an opening / closing pin (P) attached to the case (1) so as to open and close the head insertion hole (3) and the rotating hole (4). ), A spring (18) for urging the shutter (5) in a closing direction, and a slider (15) attached to the shutter (5) and slidingly contacting the case (1). (18) shutter (5)
At one end of the slider (15) from the opposite side of the engagement position between the spring (18) and the shutter (5).
An extension (15) extending along the sliding direction of the slider
a), a contact portion (33) for contacting the opening / closing pin (P) is provided at the end of the extended portion (15a) , and the shutter (5) is provided with a spring receiver for receiving the spring (18). A disk cartridge characterized in that a part (17) is formed integrally with the shutter (5).