JP2600582Y2 - 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 for storing a disk-shaped recording medium, and more particularly to an improvement in a 3.5-inch disk cartridge.

[0002]

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

As such a disk cartridge, for example, there is a type as shown in FIG. As shown in FIG. 16, reference numeral 101 denotes an upper half 101a and a lower half 1
01b, in which a disk-shaped recording medium 102 is stored. In the case 101, the disk cartridge is provided with a recording / reproducing device (not shown).
A rotation hole 103 for rotating the disk-shaped recording medium and a head insertion hole 104 to which a head (not shown) for recording / reproducing information can be accessed when the disk-shaped recording medium is loaded.

A shutter 106 is attached to the case 101 to prevent dust from entering the inside of the case 101 from the rotation hole 103, the head insertion hole 104 and the like. Further, 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 provided inside the recording / reproducing apparatus is brought into contact with a portion 106a of the shutter 106 projecting to the left side in the drawing, and a head insertion hole 104 and the like are formed against the urging force of the torsion coil spring 107. It is opened.

However, in the conventional disk cartridge, since the metal shutter 106 is in direct sliding contact with the case 101, the case 10
1, it is difficult to smoothly move the shutter 106 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 it could not be done. As an example of solving such a problem, 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 abuts, a shutter with the slider attached is provided. The portion 106 is complicated, and the size of the disk cartridge may be increased.

Therefore, the applicant of the present application has proposed a "3.5 inch disk cartridge slider" which solves such a problem (Japanese Utility Model Application No. 2-040860).
issue). The gist of the present invention is that, as shown in FIGS. 17 and 18, an elongated slider 212 made of synthetic resin is slid in a guide groove (not shown) formed in the inner surface of the case 101.
The shutter supporting portion 221 of the shutter 106 is the bent portion 1 of the shutter 106.
06b (see FIG. 16), and the shutter 106 is smoothly moved via the slider 212. A protrusion 223 is formed at one end of the slider 212, and the torsion coil spring 1 for urging is formed on the protrusion 223.
07 a split groove 22 into which the tip of one arm 107a can be fitted.
3c, a long protrusion 223a and a short protrusion 223b are formed. The short protrusion 223b
Cutout 223f indicated by a two-dot chain line on the end face 223d side
Is formed.

With this configuration, as described above, when the shutter 106 is smoothly moved via the slider 212 and the slider 212 is slid to the right contact portion 101c in FIG. One arm portion 107a of the torsion coil spring 107 is provided with the split groove 223c.
And the other arm portion 107b is stored in the notch portion 223f, so that the collision between the slider 212 and the torsion coil spring 107 is avoided, and the opening is completely opened.

[0009]

However, due to variations in the manufacturing dimensions of the torsion coil spring 107, variations in the mounting state of the torsion coil spring 107 (FIG. 17), play, etc., as shown in FIG. , The winding portion 107 c of the torsion coil spring 107 is mainly
In some cases, it came into contact with the inner surface A of 1b, generating an unpleasant rubbing sound (abnormal sound), and rubbing scabs sometimes entered the inside of the disc cartridge.

Therefore, the present invention has been made to solve the above-mentioned problems, and the shutter is moved smoothly without generating a rubbing sound, no scum is generated, and the shutter is completely opened. It is an object of the present invention to provide a disk cartridge adapted to be used.

[0011]

According to the present invention, a case in which a disk-shaped recording medium is stored to achieve the above object.
(1) Shutter for opening and closing the head insertion hole (52)
A slider (12) for sliding (5) ,
The slider (12) includes a shutter support (21) fixed to the shutter (5) and the shutter support (2).
Fit engaged Shin設been Shin portion from one end side (22) guide engagement portion of the casing to the other end (1) of the shutter support portion (21) and (17a, 27b) of 1) Joint projection (2
3) has said shutter to said engagement projection (23)
A spring receiving portion (15) to be engaged with one arm (14a) of the torsion coil spring (14) for biasing (5) is formed, and a split groove (1 ) into which the one arm (14a) enters. 23
c) is formed, and one of the fitting projections (23) divided into two by the split groove (23c) is formed shorter than the other, and the other arm of the torsion coil spring (14) is formed. The case via a bent portion (14e) formed at the tip of (14b).
In the disk cartridge adapted to be engaged with (1) , the short side of the fitting projection (23) is formed.
A winding portion (14 ) of the torsion coil spring (14) is provided on the inner surface of the case (1) when the shutter (5) is opened and closed.
The recess (67) is thinned corresponding to the locus (T) of c) .
The disk cartridge formed in the above manner is adopted.

[0012]

FIG. 2 shows a path T of the winding portion 14c of the torsion coil spring when the shutter 5 opens and closes. On the other hand, a concave portion (thickness) 67 is formed in a portion of the lower half 1b of the case corresponding to the path T. Further, when the shutter 5 is opened and closed, the torsion coil spring 14 is slidably contacted with the longer engagement projection to be on the side of the shorter engagement projection (that is, the cutout engagement projection) (that is, the lower engagement projection). Half side). However, since the concave portion 67 is formed in the lower half 1b of the pushed-in portion, the winding portion 14c does not contact the lower half 1b of the case, so that no rubbing noise is generated and no scum is generated. Never do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows the inner surface of the case according to the gist of the present invention,
2 to 15 show each part of the disk cartridge.

First, the structure of the disk cartridge will be described with reference to FIGS. As shown in FIGS. 3 (A) and 3 (B), reference numeral 1 denotes a disk cartridge case, which is made of synthetic resin and has an upper half 1a and a lower half 1b which are entirely rectangular and flat. It is composed of In the case 1, a 3.5-inch optical disk 2, which is a "disk-shaped recording medium" on which optical information is recorded, is housed. 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 by a spindle motor (not shown) when the optical disk 2 is loaded in a recording / reproducing apparatus. 4 exposes a hub 2a provided at the center of the optical disk 2. 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 from 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.

A guide portion G formed at a portion serving as an insertion tip when inserted into the recording / reproducing apparatus (see FIG. 3B).
Has a guide surface 8 formed on the left side of the figure as shown in FIG. 4, and the guide surface 8 extends horizontally in a position lowered 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 falls into the relief recess 9 when the shutter 5 is opened. The shutter 5 is moved rightward in FIG. 4 by the opening / closing pin P, and the head insertion hole 3 is opened.

On the other hand, it is not preferable that the shutter 5 malfunctions (erroneously opens) due to the open / close pin P when the disk cartridge is loaded upside down in the recording / reproducing apparatus.
In order to prevent malfunction due to the opening / closing pin P, the upper half 1a
Notches 10a, 10b into which the opening / closing pin P can be fitted are formed on the insertion tip portion of the lower half 1b and on the side opposite to the guide surface 8, and the notches 10a, 10b
In FIG. 4, a pair of malfunction prevention walls 11a,
11b is formed to protrude upward.

A slider 12 made of a synthetic resin such as polyacetal, which slides on 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. A torsion coil spring 14 is provided on the right side of the slider 12.

Here, the lower half 1b (FIG. 1) of the case 1 according to the gist of the present invention, the torsion coil spring 14 (FIG. 5) related to the lower half 1b, and the slider 12 related to the lower half 1b. (FIG. 8 etc.) will be described. Under halves 1b of the case 1 will be described first shape of the inner surface I of the lower halves 1b of the case 1 on the basis of FIG. 1 (A) ~ (C) .

As shown in FIGS. 1A to 1C, the outer shape of the lower half 1b is substantially square, and a substantially elliptical head insertion hole 52 is formed in the center of the inner surface I. Hole 5
A bridge portion 53 is formed on the head entrance side of No. 2. At approximately four corners of the lower half 1b, through screw holes 54a to 54d for screwing screws (not shown) are formed.
Notches 55a to 55f of various shapes are formed in the outer peripheral portion of b, and two round holes 56a and 56 are located on the left side in FIG.
b and one long hole 59 are formed.

An outer peripheral wall 64 is formed on the outer periphery of the inner surface I,
Inside the outer peripheral wall 64, substantially circular inner peripheral walls 61a to 61d for guiding a disk-shaped recording medium (not shown) are formed, and the inner peripheral walls 61a and 61d are formed by the bridge 53.
And are connected. A guide groove 62 for guiding one end of a slider (not shown) is formed at the upper right in the drawing. A guide groove 6 for guiding the other end of the slider is provided at the upper left of the figure.
A guide portion 65 for guiding the wide portion of the slider is formed above the guide groove 63. The periphery of the screw holes 54a to 54d and the holes 56a, 56
A small circular wall is formed around b.
On the inner surface I, the guide grooves 62 and 63 and the guide portion 65
Is the deepest dent, and the other portions are dents of substantially the same depth. Then, a substantially trapezoidal concave portion 67 that forms a so-called meat-thickness along the outer side of the upper inner peripheral wall 61a in FIG.
Are formed.

On the other hand, as shown in FIG. 2A, when the shutter 5 opens and closes, the winding portion 14c of the torsion coil spring 14 passes through the locus T, but if the concave portion 67 is formed,
The wound portion 14c and the lower half 1b of the case 1 are not rubbed, and no unpleasant noise is generated (described later in detail).
(See FIGS. 2B and 11). Then the torsion coil spring 14, FIG. 5 (A) the torsion coil spring 14 will be described with reference to (B). As shown in FIGS. 5A and 5B,
The winding portion 14c of the torsion coil spring 14 made of stainless steel wire or the like has four turns, and one arm portion 14a extends horizontally leftward from the upper surface of the winding portion 14c, and the tip thereof has an angle of 90 °. One-arm bent part 14d bent downward at ± 3 °
Are formed. Further, the other arm portion 14b is slightly bent downward at the lower surface corner of the winding portion 14c to extend,
The tip is bent upward at an angle of 90 ° (+ 5 °, −0 °) to form another arm bent portion 14e. The length between the lower surface of the winding portion 14c and the lower end surface of the other arm bent portion 14e is 1.0 (+0.2, -0) mm.

Then, the torsion coil spring 14 having such a configuration is used.
As shown in FIG. 6 (A), the arm is accommodated with its one arm 14a above the spring accommodating portion 17 of the case 1 and the other arm 14b is arranged below the spring accommodating portion 17. Is done. The torsion coil spring 14 has a first spring receiving portion 15 formed on the fitting protrusion 223 of the slider 212 and a one-arm bent portion 14d of the one-arm portion 14a engaged with the second spring formed on the case 1. The other arm bending part 1 of the other arm part 14 b is attached to the spring receiving part 16.
4e is engaged. With this arrangement, even if the torsion coil spring 14 moves downward due to backlash of the other arm bent portion 14e with respect to the second spring receiving portion 16 (see FIG. 6B), the other arm portion 14b is moved. Since it is bent outward and the other arm bent portion 1e has an angle of 90 ° or more, the winding portion 14c
Is in a raised state and separates from the inner surface of the case 1.
Therefore, no rubbing noise is generated when the shutter is opened and closed.

However, when the other arm bent portion 14e moves below the case 1 due to backlash (see FIG. 6B), the one arm portion 14a moves upward, and in this state, the shutter is opened. When the shutter is opened and closed, as shown in FIG. 7, the one arm 14a may be placed on the long protrusion 223a, and the shutter may not be opened and closed smoothly.

Therefore, in order to solve such a problem, the slider 12 is configured as follows. Slider 12 An embodiment of the slider 12 will be described with reference to FIGS. The torsion coil spring 14, the case 1, and the like used together with the slider 12 of the present embodiment are the same as those described with reference to FIGS.

As shown in FIG. 8 and FIG.
A shutter support 21 for supporting the shutter 5, which is formed in an elongated rod shape, has a substantially rectangular cross section and is located inside a bent portion 5 a of the shutter 5 (see FIG. 4); And a narrow extending portion 22 extending from the bottom to the left in the drawing, and the thickness t ₁ of the extending portion 22 as viewed from above in the drawing is equal to the thickness t ₂ of the support portion 21. It is formed so as to be narrower. A fitting projection 23 is formed on the right side of the shutter support 21 in the drawing, and an engagement projection 24 is formed on the left side of the extension 22, and the engagement projection 24 is formed on the upper side. And a fitting projection 26 formed on the lower side. Screw holes 21 a, 21 a formed of blind holes are formed in the shutter support portion 21, and the abutting projections 25 project right and left from the tip of the extension portion 22.

The reason why the thickness t ₁ of the extending portion 22 is reduced is that, as shown in FIG. 10, a pair of heads h of the recording / reproducing apparatus are inserted into the head insertion port 3 from the side with the shutter 5 opened. This is to prevent the head h from coming into contact even when approached. That is, the thickness t _{1 of the} extension 22 is determined so as not to exceed the thickness of the recess 31 formed along the guide portion G of the cartridge.

As shown in FIGS. 9 and 12, a pair of protrusions 23 are provided on both sides of the fitting protrusion 23 of the slider 12.
a, 23b are formed, and the split groove 23 of the long protrusion 23a is formed.
A chamfer R is formed on the upper corner of the c-side. The split groove 2
A torsion coil spring 14 can be fitted into 3c. The pair of projections 23a, 23b fit into a pair of guide grooves 27a, 27b, which are "guide engagement portions" formed on the inner wall surfaces of the upper and lower halves 1a, 1b in the sliding direction of the slider 12. Have been. The fitting projection 23 has a torsion coil spring 14
A first spring receiving portion 15 to which the one arm bent portion 14d of the one arm portion 14a is engaged is formed, and a hook portion 15a is formed in the first spring receiving portion 15. A second spring receiving portion 16 is formed at the upper right end of the case 1 in FIG. 13 to which the other arm bent portion 14e of the other arm portion 14b of the torsion coil spring 14 is engaged.
The slider 12 is urged leftward in FIG. 13 by the urging force of the torsion coil spring 14.

Then, the torsion coil spring 14 and the slider 12 are housed in the case 1 as shown in FIG. In this case, the one arm portion 14a is accommodated above the spring accommodating portion 17 of the case 1, and the other arm portion 14b is accommodated below the spring accommodating portion 17.

Therefore, when the slider 12 is slid to the right, the other arm portion 14b is positioned in the sliding direction (see FIG. 6), so that the shutter 12 slightly projects from the right end of the shutter 5. There is a possibility that the projection 23b of the fitted projection 23 may abut on the other arm 14b. Therefore, FIG.
As shown in the figure, the lower right side of the projection 23b is slightly cut out to form a notch 23f indicated by a two-dot chain line. As a result, the tip 23d is slightly recessed toward the shutter 5 from the tip 23e of the projection 23a. .

On the other hand, when the slider 12 is slid rightward as shown in FIG. 13, 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 projection 23b.
When the one arm 14a enters the split groove 23c, a chamfer R is formed at the upper corner of the protrusion 23a, so that the one arm 14a is smoothly introduced into the split groove 23c, The portion 14a does not get caught on the projection 23a (see FIG. 7). By the way, when the one-arm part 14a is introduced into the split groove 23c as described above, the one-arm part 14a is brought into sliding contact with the projection part 23a as shown in FIG. 14c is downward (ie, short protrusion 2).
3b). However, as shown in FIG. 2A, the winding portion 14 of the torsion coil spring 14 is attached to the lower half 1b.
Since the concave portion 67 is formed along the locus T of c, the winding portion 14c does not contact the lower half 1b.

The tips 23 of the projections 23a, 23b
The protrusions e and 23d are formed to project rightward in FIG. 13 from the end of the shutter 5 so that the shutter 5 slid via the slider 12 can slide smoothly and stably. It is.

As shown in FIG. 14, a contact projection 25 formed at the tip of the extension 22 of the slider 12 is provided.
Are slid on the guide surface 8. Further, on the left end side of the extending portion 22, an engaging projection 26 is integrally formed via an arm 33 formed below as shown in FIG. The engagement projections 26 are engaged with engagement projections 28a and 28b, which are "guide engagement portions" formed on the case 1 along the sliding direction of the slider 12, and the slider 12 is moved in the sliding direction. While being guided, the case 1 is prevented from easily coming off. When the shutter 5 is completely opened, the upper surface of the engaging projection 26 is substantially flush with the bottom of the escape recess 9 formed in the guide portion G, as shown by a two-dot chain line in FIG. Escape recess 9 for opening / closing pin P
It does not interfere with insertion into the inside.

[0034]

As described above, according to the present invention, when the shutter is opened and closed, the winding portion of the torsion coil spring may be pushed toward the lower half of the case. Is formed in the portion of the passage that passes through, so that the winding portion and the lower half of the case do not come into contact with each other, no noise is generated, and scraps are generated. Does not penetrate inside.

[Brief description of the drawings]

FIG. 1 is a view showing a lower half of a case according to an embodiment of the present invention, wherein (A) is a perspective view of an inner surface, (B) is a cross-sectional view of a main part,
(C) is a principal part enlarged plan view.

2A and 2B are diagrams illustrating a relationship between a lower half of a case and a winding portion of a torsion coil spring, wherein FIG. 2A is a diagram illustrating a passage path of the winding portion of the torsion coil spring, and FIG. It is explanatory drawing of the state in which the winding part of a coil spring is pushed toward a lower half.

3A and 3B are diagrams showing a disk cartridge to which the present invention is applied, wherein FIG. 3A is a front perspective view and FIG. 3B is a rear perspective view.

FIG. 4 is a front view of the disk cartridge.

5A and 5B are views showing a torsion coil spring used in the present invention, wherein FIG. 5A is a side view and FIG. 5B is a plan view.

6A and 6B are diagrams showing a case where the torsion coil spring is housed in a case, wherein FIG. 6A is a diagram showing a case where the torsion coil spring is positioned above, and FIG. It is a figure showing the case where it is located.

FIG. 7 is a diagram illustrating a disadvantage when the torsion coil spring is used in a conventional slider.

FIG. 8 is a perspective view of a slider used in the present invention.

FIG. 9 is a plan view, a lateral side view, and a side view in the arrow direction of the plan view of the slider.

FIG. 10 is an explanatory diagram of a state of a guide unit when a shutter of the disk cartridge is opened.

FIG. 11 is a perspective view of an engagement protrusion of the slider.

FIG. 12 is a sectional view taken along the line XII-XII in FIG. 4;

FIG. 13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a partial sectional view of the disk cartridge.

15 is a sectional view taken along the line XV-XV in FIG.

FIG. 16 is a perspective view of a conventional disk cartridge.

FIG. 17 is a plan view of a torsion coil spring portion of the conventional disk cartridge.

FIG. 18 is a perspective view of one end of a slider of the conventional disk cartridge.

[Explanation of symbols]

 I: Inner surface of lower half of case P: Opening / closing pin R: Chamfer T: Passing path of winding portion of torsion coil spring 1 ... Case 1b: Lower half of case 5 ... Shutter 12 ... Slider 14 ... Torsion coil spring 14a ... One arm portion of the torsion coil spring 14b: Another arm portion of the torsion coil spring 14c: Winding portion of the torsion coil spring 21 ... Shutter support portion 22 ... Extension portion 23 ... Fitting protrusion 23a, 23b ... Protrusion 23c ... Split Grooves 27a, 27b: guide groove 61a: inner peripheral wall 67: concave portion

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/03

Claims (1)

(57) [Scope of request for utility model registration] 1. A slider for sliding a shutter for opening and closing a head insertion hole of a case in which a disk-shaped recording medium is stored, the slider comprising: a shutter support fixed to the shutter; and a shutter support. An extended portion extending from one end of the shutter support portion and the other end of the shutter support portion has a fitting protrusion engaged with the guide engagement portion of the case,
The split groove the one arm portion penetrates with one arm portion of the fitting torsion coil spring for urging the shutter in the protrusion engaged with the spring receiving portion is formed is formed, by該割Ri groove One of the two split projections is shorter than the other
In the disk cartridge formed and engaged with the case via a bent portion formed at the tip of the other arm portion of the torsion coil spring, the fitting protrusion may be shortened.
A disc cartridge, characterized in that a concave portion is formed on an inner surface of the formed case in a reduced thickness corresponding to a locus of a winding portion of the torsion coil spring when the shutter is opened and closed.