JPH076979U - Disc cartridge - Google Patents

Abstract

(57) [Summary] [Object] To provide a disc cartridge in which chips generated by screwing a screw into a case are prevented from dropping or entering into a case when the shutter is screwed to a shutter supporting portion of a slider. [Structure] A blind hole 21a as a preliminary hole is formed in the shutter support portion 21 of the slider 12. Therefore, even when the shutter is screwed to the shutter support portion 21, the chips generated when the screw is screwed do not drop or enter the case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk cartridge that stores a disk-shaped recording medium, and more particularly to improvement of a 3.5-inch disk cartridge.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a disc-shaped recording medium used in a recording / reproducing apparatus is housed and protected in a disc cartridge in order to prevent damage and dust adhesion when not in use.

As such a disc cartridge, there is, for example, a type as shown in FIG. As shown in FIG. 13, reference numeral 101 is a case composed of an upper half piece 101a and a lower half piece 101b, and a disk-shaped recording medium 102 is stored in the case 101. A rotation hole 103 for rotating a disc-shaped recording medium and a head (not shown) for recording and reproducing information when the disc cartridge is loaded in a recording and reproducing device (not shown) approach the case 101. Possible head insertion holes 104 are formed.

A shutter 106 is attached to the case 101 in order to prevent dust from entering the case 101 through the rotation hole 103, the head insertion hole 104, and the like. The shutter 106 is constantly urged by the 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 provided inside the recording / reproducing apparatus is brought into contact with a portion 106 a of the shutter 106 protruding to the left side in the figure, and the head insertion hole 104 is resisted against the biasing force of the torsion coil spring 107. Etc. are opened.

However, in the conventional disk cartridge, since the metal shutter 106 is in direct sliding contact with the case 101, it is difficult to smoothly move the shutter 106 with respect to the case 101, and the shutter 106 and Since the case 101 is not provided with a guide portion for guiding the shutter 106 in the sliding direction, there is a problem that the shutter 106 cannot be reliably guided in the sliding direction.

As an example of solving such a problem, it is possible to attach a slider that is in 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 portion of the shutter 106 to which the disk is attached becomes complicated, and the disk cartridge may become large.

Therefore, the applicant of the present application has previously proposed “a slider for a 3.5-inch disk cartridge” which solves such a problem (Japanese Patent Application No. 2-040860). As shown in FIGS. 14 and 15, the gist of the present invention is that the shutter support portion 221 of the elongated slider 212 made of synthetic resin, which is slid in a guide groove (not shown) formed in the inner surface of the case 101, The shutter 106 is fixed inside the bent portion 106b (see FIG. 13), and the shutter 106 is smoothly moved via the slider 212. A protrusion 223 is formed at one end of the slider 212, and a split groove 223c into which the tip of one arm 107a of the torsion coil spring 107 for biasing can be fitted is formed in the protrusion 223. A long protrusion 223a and a short protrusion 223b are formed. A cutout portion 223f indicated by a two-dot chain line is formed on the end face 223d side by the short protrusion 223b.

With this structure, the shutter 106 is smoothly moved via the slider 212 as described above, and is compressed when the slider 212 is slid to the right contact portion 101c in FIG. Since the one arm portion 107a of the torsion coil spring 107 is housed in the split groove 223c and the other arm portion 107b is housed in the cutout portion 223f, a collision between the slider 212 and the torsion coil spring 107 is avoided, and the opening portion is opened. Is completely open.

Two slider holes 221 a and 221 b are preliminarily formed in the slider 221, and screws 224 a and 224 b are provided in a state where the holes formed in the shutter 106 correspond to the through holes 221 a and 221 b. As a result, the shutter 106 and the slider 221 are screwed and fixed.

[0011]

[Problems to be solved by the device]

 However, when the above-described screwing operation is performed, chips are generated inside the through holes 221a and 221b of the slider 221 due to the screws 224a and 224b being screwed in, and the chips pass through the through holes 221a and 221b and the case 101 There was an inconvenience that it dropped and entered.

Therefore, the present invention has been made to solve the above-mentioned problems, and even if the shutter and the slider are screwed and fixed, the chips generated by the screw-in do not fall into or enter the case. It is an object of the present invention to provide a disc cartridge having such a structure.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a slider for smoothly sliding a shutter for opening and closing a head insertion hole of a case for accommodating a disk-shaped recording medium, wherein the slider is The shutter support part having a screw hole for fixing to the shutter via a screw, the extension part extended from one end side of the shutter support part, and the case on the other end side of the shutter support part. Disc having a guide engaging portion and an engaging protrusion engaged with the arm, and one arm of a torsion coil spring for urging the shutter is engaged with the engaging protrusion. In the cartridge, the screw hole formed in the shutter support portion of the slider is a blind hole.

[0014]

[Action]

 Insert the screw with the screw hole of the shutter abutting the blind hole of the shutter support part of the slider. When the screw is inserted, chips are generated inside the blind hole, but since it is a blind hole, the chip does not go out of the blind hole. Therefore, the chips do not drop or enter the case.

[0015]

【Example】

 Hereinafter, the present invention will be described with reference to the illustrated embodiments. First, the overall structure of the disk cartridge will be described with reference to FIGS.

As shown in FIGS. 1 (A) and 1 (B), reference numeral 1 is a case of a disk cartridge, and the case 1 is made of a synthetic resin and has an upper half piece 1a of a rectangular flat housing. It is composed of a lower half piece 1b. A 3.5-inch optical disk 2 which is a “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, there is formed a rotation hole 4 for rotating the optical disc 2 by a spindle motor (not shown) when the optical disc 2 is loaded into the recording / reproducing apparatus. The hub portion 2a provided at the center of the optical disc 2 is exposed from the rotation hole 4. A head insertion hole 3 is formed in each of 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 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. The shutter 5 is formed by bending a thin metal plate such as stainless steel into a substantially 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 7 having a short bending length.

As shown in FIG. 2, a guide portion G (see FIG. 1 (B)) formed at a portion which becomes an insertion tip when inserting into the recording / reproducing apparatus is a guide surface formed on the left side in the figure. 8 and the guide surface 8 extends in the horizontal direction at a position dropped from the upper end surface of the case 1. A relief recess 9 is formed on the right side of the guide surface 8 in the drawing, and the opening / closing pin P is designed to be dropped into the relief recess 9 when the shutter 5 is opened. The opening / closing pin P moves the shutter 5 to the right in FIG. 2 to open the head insertion hole 3.

On the other hand, it is not preferable that the opening / closing pin P causes the shutter 5 to malfunction (erroneously open) when the disc cartridge is loaded in the recording / reproducing device in the reverse direction. In order to prevent malfunction due to the opening / closing pin P, notches 10a, 10b into which the opening / closing pin P can be fitted are formed at the insertion tip portions of the upper half piece 1a and the lower half piece 1b, which are opposite to the guide surface 8. A pair of malfunction preventing walls 11a and 11b are formed on the notches 10a and 10b so as to be adjacent to the left side in FIG.

A slider 12 made of synthetic resin such as polyacetal, which is in sliding contact with the guide portion G, is attached to the inner surface side of the bent portion 5a of the shutter 5 having a substantially U-shaped cross section, and the slider 12 is substantially right in FIG. Half is fixed to the inner surface side of the bent portion 5a by a tapping screw or the like. A torsion coil spring 14 is arranged on the right side of the slider 12.

Next, the slider 12 according to the gist of the present invention will be described with reference to FIGS. 3 to 12. As shown in FIGS. 3 and 4, the slider 12 is formed into an elongated rod shape as a whole, has a substantially rectangular cross section, and is located inside the bent portion 5a (see FIG. 2) of the shutter 5, It has a shutter support portion 21 that supports it, and a narrow extending portion 22 that extends from the supporting portion 21 to the lower left in FIG. 4, and the thickness of the extending portion 22 viewed from above in FIG. The thickness t ₁ is formed to be narrower than the thickness t ₂ of the support portion 21. A fitting projection portion 23 is formed on the right side of the shutter support portion 21 in FIG. 4, an engagement projection portion 24 is formed on the left side of the extension portion 22, and the engagement projection portion 24 is formed on the upper side. The contact projection 25 is formed and the fitting projection 26 is formed on the lower side. Screw holes 21a and 21a, which are "blind holes", are formed in the shutter support portion 21 (see FIGS. 3A and 3B), and the contact protrusion 25 is formed from the tip of the extension portion 22. It projects to the left and right. Here, the shutter 5 is fixed to the slider 12 with a screw (see FIG. 15) in a state where the bent portion 5a of the shutter 5 is brought into contact with the shutter support portion 21. At the time of this fixing, the inner walls of the screw holes 21a, 21a are fixed by being cut by the screws, but since they are blind holes, the facets do not fall inside the case.

The reason for reducing the thickness t ₁ of the extending portion 22 is that, as shown in FIG. 5, the pair of heads h of the recording / reproducing apparatus from the side to the head insertion opening 3 with the shutter 5 opened. This is to prevent the head h from coming into contact with it even if it is brought into contact with it. That is, the thickness t ₁ of the extending portion 22 is determined so as not to exceed the thickness of the recessed portion 31 formed along the guide portion G of the cartridge.

Further, as shown in FIGS. 3 and 6, a pair of protrusions 23a and 23b are formed on both sides of the fitting protrusion 23 of the slider 12, and the upper corner of the long protrusion 23a on the split groove 23c side is formed. The part is chamfered R. The torsion coil spring 14 can be fitted into the split groove 23c. The pair of protrusions 23a, 23b are provided in a pair of guide grooves 27a, 27b which are "guide engaging portions" formed on the inner wall surfaces of the upper and lower halves 1a, 1b in the sliding direction of the slider 12. It has been inserted. The fitting protrusion 23 is formed with a first spring receiving portion 15 with which the one arm bent portion 14a of the torsion coil spring 14 is engaged, and the first spring receiving portion 15 is hooked on the first spring receiving portion 15. The portion 15a is formed. A second spring receiving portion 16 to which the other arm bent portion 14e of the other arm portion 14b of the torsion coil spring 14 is formed at the upper right end of the case 1 in FIG. 7, and the biasing force of the torsion coil spring 14 is formed. Thus, the slider 12 is biased to the left in FIG.

Here, the configuration and the like of the torsion coil spring 14 will be described with reference to FIGS. 8 to 9. As shown in FIGS. 8A and 8B, the winding portion 14c of the torsion coil spring 14 made of stainless steel wire or the like has four turns, and the winding portion 14c extends horizontally to the left from the upper surface of the winding portion 14c. The one-arm bent portion 14a is extended and the tip thereof is bent downward at an angle of 90 ° ± 3 ° to form a one-arm bent portion 14d. Further, the other arm portion 14b is extended by being bent slightly downward at the lower surface corner portion of the winding portion 14c, and the tip end thereof is bent upward at an angle of 90 ° (+ 5 °, −0 °) and the other arm portion is bent. The bent portion 14e is formed. The length of the lower surface of the winding portion 14c and the lower end surface of the other arm bending portion 14e is 1.0 (+0.2, −0) mm.

Then, as shown in FIG. 9A, the torsion coil spring 14 having such a configuration is housed with its one arm portion 14 a above the spring accommodating portion 17 of the case 1, and the other arm portions 14 b. Is placed below the spring storage portion 17. In the torsion coil spring 14, the first spring receiving portion 15 formed on the fitting protrusion 223 of the slider 12 is engaged with the one-arm bent portion 14d of the one-arm portion 14a to form the first coil receiving portion formed on the case 1. The other spring bent portion 14e is engaged with the other spring portion 16b. With this arrangement, even if the torsion coil spring 14 moves downward due to the backlash of the other-arm bent portion 14e with respect to the second spring receiving portion 16 (see FIG. 9B), the other-arm portion 14b. Is bent outward and the other arm bent portion 1e has an angle of 90 ° or more, so that the winding portion 14c is in a lifted state and is separated from the inner surface of the case 1. Therefore, when the shutter is opened or closed, the torsion coil spring 14 and the case 1 do not come into contact with each other, and a rubbing noise (an unusual noise that is offensive to the ear) does not occur.

When the slider 12 is slid to the right in the state where the slider 12 is housed in the case 1 as described above, the other arm portion 14b is positioned in the sliding direction (see FIG. 7). ), The protrusion 23b of the fitting protrusion 23 slightly protruding from the right end of the shutter 5 may come into contact with the other arm 14b. Therefore, as shown in FIGS. 3A and 10, the lower right side of the protrusion 23b is slightly cut away to form a notch 23f indicated by a chain double-dashed line. As a result, the tip 23d is formed at the tip 23 of the protrusion 23a. It is slightly recessed to the shutter 5 side from e.

On the other hand, when the slider 12 is slid to the right as shown in FIG. 7, the one arm portion 14a of the torsion coil spring 14 enters the split groove 23c as shown in FIG. It is not necessary to cut out like the protrusion 23b. When the one arm portion 14a is inserted into the split groove 23c, a chamfer R is formed at the upper corner portion of the protrusion 23a, so that the one arm portion 14a is smoothly introduced into the split groove 23c. The arm portion 14a does not get caught in the protrusion 23a. Note that the tips 23e, 23d of the protrusions 23a, 23b are formed so as to project rightward in FIG. 7 from the end of the shutter 5 so that the shutter 5 slid through the slider 12 is smooth and smooth. This is to ensure stable sliding.

Further, as shown in FIG. 11, the contact protrusion 25 formed at the tip of the extended portion 22 of the slider 12 is slidably contacted with the guide surface 8. Further, as shown in FIG. 12, an engaging protrusion 26 is integrally formed on the left end side of the extending portion 22 via an arm 33 formed below. The engaging protrusions 26 are engaged with engaging protrusions 28a and 28b, which are "guide engaging portions" formed on the case 1 along the sliding direction of the slider 12, so that the slider 12 slides in the sliding direction. While being guided, it is prevented from coming off the case 1 easily. 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, as shown by the chain double-dashed line in FIG. The insertion / removal of the opening / closing pin P into the escape recess 9 is not obstructed.

[0029]

[Effect of device]

 As described above, according to the present invention, since the preliminary hole formed in the shutter supporting portion of the slider is a blind hole, a screw is screwed into the blind hole with the shutter and the slider being aligned at predetermined positions. However, the chips will not fall or enter the case.

[Brief description of drawings]

1A and 1B are views showing a disk cartridge of an embodiment of the present invention, in which FIG. 1A is a front perspective view and FIG. 1B is a rear perspective view.

FIG. 2 is a front view of the disc cartridge.

3A and 3B are views showing a slider according to the gist of the present invention, in which FIG. 3A is a plan view, FIG. 3B is a lateral side view, and FIG. 3C is a side view in the arrow direction of the plan view.

FIG. 4 is a perspective view of the slider.

FIG. 5 is a state explanatory view of a guide portion when a shutter of the disc cartridge is opened.

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

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

8A and 8B are views showing a torsion coil spring used in this embodiment, in which FIG. 8A is a side view and FIG. 8B is a plan view.

9A and 9B are diagrams showing a case where the torsion coil spring is housed in a case, FIG. 9A is a diagram showing a case where the torsion coil spring is located above, and FIG. 9B is a diagram showing the torsion coil spring downward. It is a figure which shows the case where it is located.

FIG. 10 is a perspective view of an engaging protrusion of the slider.

FIG. 11 is a partial cross-sectional view of the disc cartridge.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a perspective view of a conventional disc cartridge.

FIG. 14 is a plan view of a torsion coil spring portion of a conventional disc cartridge.

FIG. 15 is a perspective view of one end of a slider of a conventional disc cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 3 ... Head insertion hole 5 ... Shutter 12 ... Slider 14 ... Torsional coil spring 14a ... One arm part of torsion coil spring 14b ... Other arm part of torsion coil spring 21 ... Shutter support part 21a ... Screw hole 22 ... Extension Part 23 ... Fitting projection 23a, 23b ... Projection 23c ... Split groove 27a, 27b ... Guide groove

Claims (1)

[Scope of utility model registration request] 1. A slider for smoothly sliding a shutter for opening and closing a head insertion hole of a case for accommodating a disk-shaped recording medium, the slider being fixed to the shutter via a screw. A shutter support portion having a screw hole for the operation, an extension portion extending from one end side of the shutter support portion, and a guide engagement portion of the case on the other end side of the shutter support portion. A shutter supporting portion of the slider, wherein a one-arm portion of a torsion coil spring for urging the shutter is engaged with the engaging protrusion. The disk cartridge, wherein the screw hole formed in is a blind hole.