JPH0863933A - Slider for 3.5 inches disk cartridge - Google Patents

Abstract

PURPOSE: To unnecessitate forming a projecting part abutting on an opening/ closing pin on a shutter, to simplify a shutter part with a slider attached, to attain the miniaturization of a disk cartridge, and also, to surely read/write information. CONSTITUTION: This slider is provided with a supporting part 21 fixed on the shutter 5 and an extended part 22 elongated from the supporting part 21. The thickness of the extended part 22 is made equal to or below the thickness of a recessed part 31 formed on a case 1 and prepared for guiding the shutter 5 so that a head for reading/writing the information can pass through the extended part 22, and also, the length of the extended part 22 is made equal to or exceeding the width of the recessed part 31.

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 or dust attached when not in use. It is protected by An example of such a disc cartridge is shown in FIG. In FIG. 11, reference numeral 1
A case 01 is composed of an upper half piece 101a and a lower half piece 101b, and the case 101 accommodates a disk-shaped recording medium 102. The case 101 has a rotation hole 103 for rotating the disc-shaped recording medium when the disc cartridge is loaded in the recording / reproducing apparatus,
A head insertion hole 104 is formed so that the head can approach in order to read and write information.

A shutter 106 is attached to the case 101 in order to prevent dust from entering the case 101 through the rotation hole 103 and the head insertion hole 104. Further, the shutter 106 is the case 10
It is constantly urged by a torsion coil spring 107 housed in 1 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 protruding to the left side of the shutter 106 in FIG. 11, and the head insertion hole 104 and the like are opened against the biasing force of the torsion coil spring 107.

[0005]

However, in such a conventional disc cartridge, since the metallic shutter 106 is in direct sliding contact with the case 101,
It is difficult to slide the shutter 106 smoothly on 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 106 is slid in the sliding direction. There was a problem that I could not be surely guided to. Therefore, it is conceivable to attach a slider that makes sliding contact with the case 101, but since the shutter 106 must be provided with a protruding portion 106a with which the opening / closing pin P abuts, the shutter 106 portion to which the slider is attached becomes complicated. However, there is a risk that the disc cartridge may become large.

[0006]

In order to solve such a problem, a slider of a 3.5-inch disk cartridge of the present invention opens and closes a head insertion hole of a case accommodating a disk-shaped recording medium. A slider made of synthetic resin, which is attached to the shutter for sliding contact with the case, and has a shutter supporting portion fixed to the shutter, and an extending portion extending from the supporting portion. , The thickness of the extended portion is set within the thickness of the recessed portion formed by recessing the guide portion for guiding the shutter of the case so that the head for reading and writing information can pass therethrough. The length of the extended portion is equal to or larger than the width of the recessed portion.

Since the slider of the 3.5-inch disk cartridge of the present invention has an extension portion extending from the portion where the shutter is attached, the opening / closing pin is brought into contact with the projection end of the extension portion. And press the slider,
The shutter can be opened and closed. Therefore, it is not necessary to form a projecting portion that abuts the opening / closing pin on the shutter.

By the way, when the slider is pushed, the shutter is opened, and the open / close pin holds the opened state of the shutter. At this time, the extended portion of the slider is located in the recess formed in the guide portion of the shutter of the case. The tip end surface of the head for reading and writing information approaches the recess portion from the side and passes through the recess portion, but it is necessary not to contact the extension portion when the tip end surface passes. Therefore, the thickness of the extended portion is set to be within the thickness of the recessed portion, and the length of the extended portion is set to be equal to or larger than the width of the recessed portion. Therefore, even if the tip of the head moves toward the head insertion hole, the head can be positioned in the head insertion hole without coming into contact with the extension portion and being blocked by the extension portion.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 is a case of a disk cartridge. The case 1 is made of synthetic resin and has an upper half piece 1a and a lower half piece 1 which are rectangular plate-like casings as a whole.
It consists of b and. A 3.5-inch optical disk 2 (disk-shaped recording medium) in which optical information is recorded is housed in the case 1. At the center of the lower half piece 1b of the case 1, when the optical disk 2 is loaded in the recording / reproducing apparatus,
A rotation hole 4 for rotating the optical disc 2 in the case 1 by a spindle motor (not shown) is formed, and a hub portion 2a provided at the center of the optical disc 2 is exposed from the rotation hole 4. Also, the upper and lower half pieces of case 1
Head insertion holes 3 are formed in a and 1b so that an optical head (not shown) for reading the information recorded on the optical disc 2 can be approached.

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.
Is installed. The shutter 5 is formed by bending a thin metal plate such as stainless steel into a U-shaped cross section from a substantially central portion, and an opening / closing plate portion 6 for opening / closing the rotation hole 4 and the head insertion hole 3, and the opening / closing plate portion 6. Also has an auxiliary opening / closing plate portion 7 having a short bending length.

As shown in FIG. 3, the guide portion G formed at the tip of the recording / reproducing apparatus insertion side of the case 1 is formed on the left side of the drawing and extends horizontally at a position dropped from the upper end surface of the case 1. It has a guide surface 8. On the right side of the guide surface 8 in the figure, an opening / closing pin P for opening / closing the shutter 5 is formed with an escape recess 9 for dropping 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 bent portion 5a of the shutter 5 having a substantially U-shaped cross section.
A slider 12 made of synthetic resin such as polyacetal, which is slidably contacted with the guide portion G, is attached to the inner surface side of the slider 12. The slider 12 has a substantially right half in FIG.
It is fixed to the inner surface side of the with a tapping screw or the like.

As shown in FIG. 4, the slider 12 has a slender rod shape as a whole, has a substantially rectangular cross section, is located inside the bent portion 5a of the shutter 5, and supports the shutter 5. 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 ₁ of the extending portion 22 when viewed from above in the figure is supported. It is formed so as to be smaller than the same thickness t ₂ of the portion 21. An engaging protrusion 23 is formed on the right side of the support portion 21 in FIG. 4, and the engaging protrusion 2 is also formed on the left side of the extension portion 22.
4 is formed, and the engaging protrusion 24 is composed of an abutment protrusion 25 formed on the upper side and a fitting protrusion 26 formed on the lower side. The support portion 21 has screw holes 21a, 2
1a is formed, and the abutting protrusion 25 extends laterally from the tip of the extending portion 22.

As shown in FIGS. 5 and 6, a pair of protrusions 2 are provided on both sides of the fitting protrusion 23 of the slider 12.
3a, 23b are formed, and the pair of protrusions 23a, 23a,
23b is a slider 1 on the inner wall surfaces of the upper and lower halves 1a and 1b.
A pair of guide grooves 27a formed in the sliding direction of 2,
It is fitted in 27b. The one protruding portion 23a is long and the other protruding portion 23b is short. A first spring receiving portion 15 with which one end 14a of the torsion coil spring 14 is engaged is formed on the fitting protrusion 23, and a hooking portion 15a is formed on the first spring receiving portion 15. A second spring receiving portion 16 to 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 to the left in FIG. 6 by the biasing force of the torsion coil spring 14. I am biased toward. Further, the fitting protrusion 23 is formed with a split groove 23c into which the torsion coil spring 14 can be fitted. The other protruding portion 23b is formed to be short because the arm 14b at the other end of the torsion coil spring 14 is provided when the shutter 5 is completely opened as shown in FIG.
This is for avoiding the collision with the projection 23b.

On the other hand, the slider 12 has a bent portion 5 of the shutter 5 so that it can come into contact with the opening / closing pin P as shown in FIG.
Although it is formed by extending from a to the left in the figure, the thickness t ₁ of the extending portion 22 is made smaller by the shutter 5
This is to prevent the pair of heads h of the recording / reproducing apparatus from coming into contact with the head insertion opening 3 from the side when the head is opened. That is, the head h is shown in FIG.
Further, as shown in FIG. 8, the case 1 moves from the side of the insertion tip side toward the head insertion hole 3. This head h
The front end surface h ₁ of the optical disc is close to the surface of the optical disc 2 housed therein. Therefore, a recessed portion 31 having a thickness t ₃ is recessed from the surface of the case 1 so that the front end surface h ₁ of the head h can approach and pass from the side toward the insertion front end side of the case 1.
Is formed. Thickness t ₃ and width l of the recess 31
_1, the head h of the front end surface h ₁ is in a predetermined passable thickness t
₃ and width l ₁ .

Then, the slider 1 is opened and closed by the opening and closing pin P.
When 2 is pushed to the right, the shutter 5 is opened and the open / close pin P
It drops into the escape recess 9 and the open / close pin P
Thus, the open state of the shutter 5 is maintained. At this time,
The extended portion 22 of the rider 12 is located in the recess 31 of the case 1.
It is location. As described above, the recess 31 has the head h
Tip surface h₁Passes through, but this tip surface h that passes₁Stretched
It must be ensured that it does not abut the installation part 22. There
And the thickness t of the extended portion 22₁Is the thickness t of the recess 31 ₃More than
Slightly smaller (thickness t₃It may be the same as), and extension 2
Length 2₂Is the width l of the recess 31₁Slightly larger (width
l₁It may be the same as).

By the way, when the head h moves from the front side in FIG. 7 to the head insertion port 3 on the opposite side while the shutter 5 is open, the surface h ₁ approaches the surface of the recess 31 and then the recess. Pass through section 31. Extension part 22
Is formed to have the thickness t ₁ and the length l ₂ described above, so that even if the tip h ₁ of the head h moves toward the head insertion hole 3, it abuts the extension portion 22 and It can be located in the head insertion hole 3 without being blocked. Therefore, when the shutter 5 is opened via the slider 12 by the opening / closing pin P, the head h moves toward the extension portion 22.
It can be positioned in the head insertion hole 3 without coming into contact with and being blocked, and information can be surely read / written from / on the optical disk 2.

The contact projection 25 formed at the tip of the extended portion 22 of the slider 12 makes sliding contact with the guide surface 8. Further, as shown in FIGS. 9 and 10, an engaging projection portion 26 is integrally formed on the left end side of the extending portion 22 via an arm portion 33 formed below. Engagement protrusion 2
6 is engaged with guide engaging portions 28a and 28b formed on the case 1 along the sliding direction of the slider 12,
The slider 12 is guided in the sliding direction and is prevented from easily coming off the case 1. Then, when the shutter 5 is completely opened, the upper surface of the engaging projection 26 is substantially flush with the bottom surface of the relief recess 9 formed in the guide portion G, and the opening / closing pin P is inserted into the recess recess 9. It's designed not to disturb you.

On the other hand, the slider 12 is formed with the extension portion 22 extending from the bent portion 5a of the shutter 5. Therefore, the opening / closing pin P is brought into contact with the protruding end of the extension portion 22 to push the slider 12. For example, the shutter 5 can be opened and closed. Therefore, it is not necessary to form a projecting portion on the shutter 5 that comes into contact with the opening / closing pin P, and the extended portion 22 of the slider 12 serves as the projecting portion, thereby simplifying the shutter 5 portion to which the slider 12 is attached. Is
This disc cartridge can be miniaturized.

[0020]

As described above, according to the present invention,
Since the slider is formed by extending the extension portion to which the opening / closing pin can abut from the portion to which the shutter is attached, the opening / closing pin can abut the extension portion to open / close the shutter. Therefore, it is not necessary to form a projecting portion that abuts the opening / closing pin on the shutter, the shutter portion to which the slider is attached is simplified, and the disc cartridge can be downsized.

Further, the thickness of the extended portion of the slider is set within the thickness of the recessed portion formed by recessing the guide portion for guiding the shutter of the case so that the head for reading and writing information can pass therethrough. At the same time, since the length of the extended portion is set to be equal to or larger than the width of the recessed portion, even if the head is moved toward the head insertion hole when the shutter is opened through the slider by the opening / closing pin, The head can be positioned in the head insertion hole without being blocked by contact with the extending portion, and the reading and writing of information on the disk-shaped recording medium can be reliably performed.

[Brief description of drawings]

FIG. 1 is a front perspective view of a disk cartridge using a slider.

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

FIG. 3 is a front view of a disc cartridge.

FIG. 4 is a perspective view of a slider.

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

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

FIG. 7 is a partial plan view of a disc cartridge.

FIG. 8 is an explanatory view of the state of the guide portion when the shutter is opened.

FIG. 9 is a partial sectional view of a disk cartridge.

10 is a sectional view taken along line XX in FIG.

FIG. 11 is a perspective view showing a conventional disc cartridge.

[Explanation of symbols]

1 ... Case 3 ... head insertion hole 5 ... shutter 12 ... slider 22 ... thickness l ₂ ... length of Shin portion Shin portions 23, 24 ... engaging projection 31 ... recessed portion t ₁ ... Shin portion

Claims (1)

[Claims] 1. A slider made of synthetic resin, which is attached to a shutter for opening and closing a head insertion hole of a case in which a disk-shaped recording medium is housed, and is in sliding contact with the case, the slider being fixed to the shutter. The shutter has a support portion and an extension portion extended from the support portion, and guides the shutter of the case so that a head for reading and writing information can pass through the thickness of the extension portion. Of the disk cartridge for 3.5 inches, characterized in that the thickness of the recessed portion formed by recessing the guide portion is within the thickness of the recessed portion, and the length of the extended portion is equal to or more than the width of the recessed portion. slider.