JP2524914Z - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a slider for guiding a shutter of a disk cartridge containing a disk-shaped recording medium, particularly a 3.5-inch disk cartridge. [Prior Art] A disc-shaped recording medium used in a recording / reproducing apparatus stores the disc-shaped recording medium 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. 12 shows an example of such a disk cartridge. In FIG. 12, reference numeral 10
Reference numeral 1 denotes a case composed of an upper half piece 101a and a lower half piece 101b. In this case 101, a disk-shaped recording medium 102 is stored. The case 101 has a rotating hole 103 for rotating the disk-shaped recording medium when the disk cartridge is mounted on the recording / reproducing apparatus, and a head insertion hole for accessing the head for reading and writing information.
104 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 106 is constantly urged by a torsion coil spring 107 housed in the case 101 to close the rotation hole 103 and the head insertion hole 104. An opening / closing pin P is brought into contact with a portion 106a of the shutter 106 projecting to the left side in FIG. 12 to open a head insertion hole 104 and the like against the urging force of the torsion coil spring 107. [Problem to be Solved by the Invention] However, in such a conventional disk cartridge, since the metal shutter 106 is in direct sliding contact with the case 101, the shutter 106 is
It is difficult to slide the shutter 106 smoothly in the sliding direction because the shutter 106 and the case 101 are not provided with a guide portion for guiding the shutter 106 in the sliding direction. There was a problem that they could not be guided. 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 on which the slider is attached becomes complicated. In addition, there is a possibility that the size of the disk cartridge is increased. [Means for Solving the Problems] In order to solve such a problem, in the present invention, a shutter for opening and closing a head insertion hole of a case containing a disk-shaped recording medium is attached, A slider made of a synthetic resin that is in sliding contact with the case, the slider having a shutter supporting portion fixed to the shutter, and an extending portion extending from the supporting portion;
At the tip of the extended portion, a contact projection that contacts an opening / closing pin that slides on the edge of the case was formed, and a corner of the surface of the contact projection facing the edge was chamfered in the sliding direction. It is characterized by the following. [Operation] Since the slider has an extended portion extending from the portion where the shutter is attached, the shutter can be opened and closed by pressing the slider with the opening / closing pin contacting the protruding end of the extended portion. Can be. Therefore, it is not necessary to form a protruding portion in contact with the opening / closing pin on the shutter. To open the shutter, an opening / closing pin is brought into contact with the tip of the contact projection of the slider, and the opening / closing pin pushes the slider while sliding on the guide surface. If there is a manufacturing error in the slider contact projection or guide surface, the corner of the surface of the contact projection that faces the guide surface will come into contact with the corner of the relief recess formed on the guide surface. As a result, sliding of the slider is prevented by the corners. However, since the corners of the contact projections are chamfered, even if there is some error, the corners of the contact projections pass over the corners of the relief recess, and the Is completely slid. Hereinafter, the present invention will be described with reference to the drawings. 1 to 11 show an embodiment of a slider of a 3.5 inch disk cartridge according to the present invention. 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 which are entirely rectangular and flat.
1b. A 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 rotation 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 accessed. When the optical disk 2 is not used, a shutter 5 is attached to the case 1 in order to prevent dust from entering the case 1 through the rotation hole 4 and the head insertion hole 3. 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 pair of guides G formed on the left end of the case 1 and extending horizontally from the upper end surface of the case 1 are formed at the leading end of the recording / reproducing apparatus insertion end of the case 1. It has surfaces 8a and 8b (edges of the case). Guide surface 8a,
On the right side of FIG. 8b, a relief recess 9 is formed to allow the opening / closing pin P for opening and closing the shutter 5 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. 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 of the bent portion 5a of the shutter 5 having a substantially U-shaped cross section. It is fixed to the inner surface side of the bent portion 5a by a tapping screw or the like. As shown in FIG. 4, the slider 12 has an elongated rod shape as a whole, has a substantially rectangular cross section, is located inside the bent portion 5a of the shutter 5, and has a shutter supporting portion 21 for supporting the shutter 5. And a narrow extending portion 22 formed by extending from the supporting portion 21 to the lower left in FIG. 4. The thickness t ₁ of the extending portion 22 as viewed from above in FIG. It is formed to be smaller compared to the same thickness t ₂ parts 21. An engaging projection 23 is formed on the right side of the support 21 in FIG. 4, and an engaging projection 24 is also formed on the left side of the extension 22. It comprises a contact projection 25 formed and a fitting projection 26 formed on the lower side via an arm 33. The support portion 21 has a screw hole 21
a, 21 a are formed, and the contact protrusion 25 protrudes left and right from the tip of the extension 22. The reason why the thickness t ₁ of the extension portion 22 is reduced is that the pair of heads h of the recording / reproducing apparatus approaches the head insertion port 3 from the side with the shutter 5 opened as shown in FIG. This is to avoid contact with it. That is, the thickness t ₁ of the extension 22 is determined so as not to exceed the thickness of the recess 31 formed by recessing the guide G of the cartridge. As shown in FIGS. 6 and 7, a pair of projections 23a and 23b are formed on both sides of the fitting projection 23 of the slider 12, and the pair of projections 23a and 23b , 1b, a pair of guide grooves 27 formed in the inner wall surface in the sliding direction of the slider 12.
a, 27b (guide engaging portions). Note that one protruding portion 23a is formed long and the other protruding portion 23b is formed short. The first spring receiving portion 15 in which one end 14a of the torsion coil spring 14 is engaged with the fitting projection 23
The first spring receiving portion 15 is formed with a hook portion 15a. Case 1
7, 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, and the slider 12 is moved by the urging force of the torsion coil spring 14 to the left in FIG. It is biased toward. The fitting projection 23 has a split groove 23c into which the torsion coil spring 14 can be fitted. The reason why the other protrusion 23b is formed short is that the arm 14b of the helical coil spring 14 collides with the protrusion 23b when the shutter 5 is fully opened as shown in FIG. To avoid. As shown in FIGS. 8 and 9, the contact projection 25 formed at the tip of the extension portion 22 of the slider 12 contacts the opening / closing pin P, and the opening / closing pin P causes the guide surfaces 8a and 8b to be in contact.
Slide on top. Here, the open / close pin P comes into contact with the contact protrusion 25 of the slider 12,
When the slider 12 is slid to the upper left in FIG. 9 while sliding on the guide surface 8 and falls into the relief recess 9, the opening / closing pin P comes into contact with the arm 33 of the slider 12. The slider 12 which receives the urging force of the torsion coil spring 14 prevents the arm 33 from coming into contact with the opening / closing pin P which has fallen into the relief recess 9 and is slid downward and to the right in FIG. The contact projection 25 has projections 25a, 25b formed on the distal end side of the extension 22 and formed on the right and left sides and having a substantially rectangular cross section. The lower surfaces of the projections 25a, 25b are on the guide surface. 8a
, 8b. Corners 25c and 25d in the sliding direction of the slider 12 on the lower surface side of the protruding portion 25b are chamfered (for example, R (R)). Guide surface 8a,
Both corners 9a and 9b above the relief recess 9 formed in 8b are also chamfered. As shown in FIG. 8, an engagement protrusion 26 is integrally formed on the left side of the extension 22 with an arm 33 therebetween. The engagement projections 26 are engaged with engagement projections 28a and 28b (guide engagement portions) formed on the case 1 along the sliding direction of the slider 12, respectively.
The slider 12 is guided in the sliding direction and is prevented 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 of the escape recess 9 formed in the guide portion G as shown in FIG. The insertion into the escape recess 9 is not obstructed. In order to open the shutter 5 that closes the head insertion hole 3, the opening / closing pin P is brought into contact with the tip of the contact projection 25 of the slider 12 as shown in FIG. The slider 12 is pushed rightward while sliding on the guide surfaces 8a, 8b. When the slider 12 slides to the right while the contact projection 25 and the first engagement projection 26 are guided by the guide surface 8 and the engagement projections 28a and 28b, respectively, the shutter 5 fixed to the support 21 is released. It is moved to the right to open the head insertion hole 3. Shutter 5
When the opening of the shutter 5 is completed, the opening / closing pin P falls into the escape recess 9 to keep the shutter 5 open. At this time, the projections 25a and 25b slide while being guided by the guide surfaces 8a and 8b, respectively. Since the escape recesses 9 are formed in the guide surfaces 8a and 8b, the corners of the projections 25a and 25b are formed. 25d and 25f pass while contacting the corner 9b of the escape recess 9. Here, if there is a manufacturing error in the contact projection 25 of the slider 12, the guide surfaces 8a, 8b, etc., the corners 25d, 25f abut on the protruding corner 9b.
As a result, sliding of the slider 12 is prevented. Consequently, the slider 12 is not slid to the right in FIG. 8 until the end, and the shutter 5 is not completely opened. However, since the corners 25d and 25f are chamfered, even if there is the aforementioned error, the corners 25d and 25f pass over the corner 9b, the slider 12 is slid to the end, and the shutter 5 is completely open. Next, when the opening / closing pin P separates upward from the escape recess 9 to close the shutter 5, the slider 12 slides leftward in FIG. 8 and returns to the initial position by the urging force of the torsion coil spring 14. . At this time, if there is the error,
The corners 25c and 25e of the 25a and 25b abut against the corner 9a of the relief recess 9, so that the slider 12 is prevented from sliding. However, since the corners 25c and 25e are similarly chamfered, the corners 25c and 25e pass over the corner 9a, the slider 12 slides, and the shutter 5 is closed. Here, the open / close pin P of the recording / reproducing apparatus protrudes from the right side to the left side in FIG. 11 with respect to the case 1 of the disk cartridge inserted into the apparatus. In some cases, the opening / closing pin P has a small amount of protrusion in the left direction. For example, the amount of protrusion of the opening and closing pin P is reduced, and not only projects to a position of P _1. Then, a part of the head of the opening / closing pin P is located below the protruding portion 25b. For this reason, the opening / closing pin P is difficult to separate upward,
Since the corner 25c of 25b is chamfered, the opening / closing pin P can be removed upward while rubbing against the corner 25c. On the other hand, since the extended portion 22 is formed to extend from the bent portion 5a of the shutter 5 on the slider 12, the shutter 12 is pushed by bringing the opening / closing pin P into contact with the protruding end of the extended portion 22 and pressing the slider 12. 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 extension portion 22 of the slider 12 has the role of the protruding portion, thereby simplifying the shutter 5 portion on which the slider 12 is mounted. Thus, the size of the disk cartridge can be reduced. [Effects of the Invention] As described above, according to the present invention, since the slider is formed by extending the extension that the opening / closing pin can contact from the portion where the shutter is attached, The shutter can be opened and closed by bringing the opening and closing pin into contact. Therefore,
There is no need to form a protruding portion in contact with the opening / closing pin on the shutter, so that the shutter portion to which the slider is attached is simplified, and the disk cartridge can be downsized. In addition, an abutting projection is formed at the tip of the extended portion so as to abut on the opening / closing pin and slidably contacts an edge of the case. Since there is a chamfered portion, even if there is a manufacturing error between the contact protrusion and the relief recess formed at the edge of the case, the corner of the contact protrusion crosses the corner of the relief recess. Can pass through. Therefore, the slider can slide without being hindered by the corner of the escape recess, and can completely open and close the shutter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 11 are views showing an embodiment of a slider of a 3.5-inch disk cartridge according to the present invention, and FIG. 1 is a diagram of a disk cartridge using this slider. FIG. 2 is a perspective view of the disk cartridge, FIG. 3 is a front view of the disk cartridge, FIG. 4 is a perspective view of a slider, and FIG. 5 is a state explanation of a guide portion when a shutter is opened. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3,
7 is a sectional view taken along the line VII-VII in FIG. 6, FIG. 8 is a partially enlarged sectional view of the disk cartridge, FIG. 9 is a perspective view taken along the arrow IX in FIG. 8, and FIG. FIG. 11 is a sectional view taken along line XX of FIG. 9, FIG. 11 is a sectional view taken along line XI-XI of FIG. 9, and FIG. 12 is a perspective view showing a conventional disk cartridge. 1 ... case, 3 ... head insertion hole, 5 ... shutter, 9 ... escape recess, 12 ...
Slider, 22 ... Extended part, 25: Contact protrusion, 25c, 25d, 25e, 25f ... Sliding direction corner, P ... Open / close pin.

Claims (1)

[Claim 1] A synthetic resin slider attached to a shutter for opening and closing a head insertion hole of a case in which a disk-shaped recording medium is stored and slidingly contacting the case, The slider has a shutter supporting portion fixed to the shutter and an extending portion extended from the supporting portion. The tip of the extending portion comes into contact with an opening / closing pin sliding on the edge of the case. A slider for a disk cartridge, wherein a contact protrusion is formed, and a corner in a sliding direction of a surface facing the end edge of the contact protrusion is chamfered.