JPH10320951A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the assembling work through manufacture with the ejection molding method in the thickness conforming to the specification of disk cartridge by forming a shutter means to have the projecting steps in the same direction or inverse direction to the disk cartridge case. SOLUTION: An optical disk type recording medium is accommodated within an almost square and flat cartridge case 20 consisting of an upper half 11 and a lower half 12. An aperture 14 formed to the cartridge case 20, shutter plates 16a, 16b for opening and closing a head inserting slot 15 and a slider 17 which is provided to slide along the end portion 19 in the inserting side are formed integrally by the ejection molding of polyoxymethylene as the shutter slider body 30. In order to enhance the strength of the shutter plates 16a, 16b, a part of the shutter is formed in the shape having the projecting steps in the same direction and/or inverse direction to the cartridge case 20 in order to increase the bending strength to 1.0 to 1.4 times the strength of the flat shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk cartridge containing a disk-shaped recording medium such as a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, a disk-shaped recording medium such as a magneto-optical disk has been used to prevent writing and reading errors of information signals caused by contamination due to dust or the like when not in use and damage caused by contact with other things. It is used as a disk cartridge housed in a predetermined case. FIG. 1 shows an example of such a disk cartridge. In this embodiment, the disk-shaped recording medium 3 is housed in a substantially rectangular flat cartridge case 10 composed of an upper half 1 and a lower half 2.
In the recording / reproducing apparatus, a drive hole for inserting a drive shaft for rotating the stored disk-shaped recording medium 3 and a part of the recording surface of the disk-shaped recording medium 3 are exposed to record information. An opening 4 is formed integrally with a head insertion hole for allowing a head for reproduction to be accessible, and a head insertion for allowing a magnet for magnetic bias at the time of writing to be accessible in the upper half 1. A hole 5 is formed. Further, in order to prevent dust from entering the disk cartridge from the openings 4 and 5, etc.
A shutter 6 for closing these openings when the disk cartridge is not used is provided. The shutter 6 is slidably provided along the end 9 of the cartridge case 10 on the side of insertion of the cartridge case 10 into the recording / reproducing apparatus. Screw 40 on slider 7
And so on. The slider 7 is biased by a torsion coil spring 8 disposed at one corner in the cartridge case 10 so that the shutter closes the opening.

[0003]

In the above-described conventional disk cartridge, the slider 7 is assembled and the disk cartridge case 10 is assembled by screws or the like, so that the number of parts is large and the operation is complicated. In order to solve this, a shutter and a slider in which a shutter and a slider are integrally formed by a technique such as injection molding are used.
By using a slider integrated structure, the number of parts is reduced, the assembling work is simplified, and the cost can be reduced. However, in this method, since a technique such as injection molding is employed, a synthetic resin is used as a material. Therefore, in order to secure the strength of the shutter portion of the shutter / slider integrated structure from the rigidity, the thickness is increased. There was a problem that it was necessary.

[0004]

According to the present invention, in order to secure the strength of the shutter portion of the shutter / slider integrated structure described above, the shutter portion is moved in the same direction with respect to the disk cartridge case. By providing a shape having irregularities in the opposite direction, the strength is secured, and the thickness can be manufactured by injection molding or the like at a thickness conforming to the specification of the disc cartridge.

That is, in the disk cartridge of the present invention, a disk-shaped recording medium is rotatably housed in a cartridge case composed of an upper half and a lower half, and at least one of the upper and lower halves records at least the disk-shaped recording medium. A head insertion hole for exposing a part of the surface, a drive shaft insertion hole for rotating the disc-shaped recording medium, or an opening in which the drive shaft is integrated (hereinafter, these head insertion hole, drive shaft The insertion hole and the opening in which they are integrated are collectively referred to as an "opening."), A slider portion slidably provided along one end of the disk cartridge case, and sliding of the slider portion A disk cartridge having a shutter / slider integrated structure in which a shutter plate for opening and closing the opening is integrally formed with the shutter plate. Tsu shutter disk mosquito data slider integral structure - Torijjike - scan hand, is characterized in that a shape having irregularities in the same direction and / or reverse.

The shutter / slider integrated structure is preferably formed by integral molding of a synthetic resin. The method of forming the shutter / slider integrated structure is not particularly limited, but a method such as an injection molding method or an optical molding method is used. Is preferred. The material used for the injection molding method is not particularly limited, but the moldability,
Polypropylene (PP), polyoxymethylene (POM), polycarbonate (P)
C), acrylonitrile-butadiene-styrene copolymer (ABS), polybutyl terephthalate (PBT),
Polyethylene terephthalate (PET) is preferred.
Also, a two-color molding method using different materials for the shutter portion and the slider portion of the shutter / slider integrated structure can be used. The material used for the stereolithography is not particularly limited, but it is preferable to use an ultraviolet curable resin because it can be easily formed.

Further, in the disk cartridge of the present invention, the shutter / slider integrated structure has an engaging portion formed of ribs and / or grooves formed on opposing inner surfaces of the upper and lower halves, and a slider portion of the integrated structure. The cartridge case is preferably slidably held along one end of the cartridge case by an engagement structure portion that engages with the engagement portion. The length of the slider along the sliding direction is longer than the width of the shutter plate along the slider sliding direction, and the engaging structure is formed at the front end and the rear end of the slider. It is more preferable because the sliding can be performed stably. The front end of the engaging structure formed at the front end and the rear end of the slider portion of the shutter / slider integrated structure is
After assembling the cartridge case, the engaging structure portion can be inserted into the engaging portions formed on the opposing inner surfaces of the upper and lower halves in the thickness direction of the cartridge case at the leading end of the engaging structure portion. It is effective to have a shape in which the thickness along the center gradually decreases toward the center of the cartridge case.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 2 is an exploded perspective view showing an embodiment of the disk cartridge according to the present invention.
For a conventional 3.5-inch magneto-optical disk cartridge conforming to the standard specified in 6272, a shutter / slider integrated structure in which they are integrally formed by injection molding of synthetic resin is used instead of the shutter and slider. It was done.

A disk-shaped recording medium 13 is accommodated in a substantially rectangular flat cartridge case 20 composed of an upper half 11 and a lower half 12.
2 is provided with a head insertion hole for exposing at least a part of the recording surface of the disk-shaped recording medium 13. In this example, the lower half 12 has a drive hole for inserting a drive shaft for rotating the stored disk-shaped recording medium 13 when the disk is mounted on a recording / reproducing apparatus, and a recording surface of the disk-shaped recording medium 13. Expose part of the
An opening 14 is formed integrally with a head insertion hole for making a head for recording and reproducing information accessible, and a magnet for magnetic bias at the time of writing is made accessible to the upper half 11. Head insertion hole 15 is formed. As a material for forming the upper half 11 and the lower half 12, polycarbonate, ABS, or the like is used. In this example, the cartridge case 2
The disk-shaped recording medium accommodated in the disk 0 is a current 3.5-inch magneto-optical disk, and a hub 31 having a metal disk for magnetically coupling with a drive shaft for rotating the disk is provided at the center of the disk. Is provided.

In order to prevent dust from entering the disk cartridge through openings provided in the upper and lower halves,
When the cartridge is not used, the shutter plates 16a and 16b for closing these openings are integrally formed with the slider portion 17 slidably provided along one end portion 19 of the cartridge case by injection molding of synthetic resin. The shutter / slider integrated structure 30 is provided. In addition,
In this example, the slider portion 17 of the shutter / slider integrated structure 30 is slidably attached along the insertion side end portion 19 of the cartridge case into the recording / reproducing device.
The sliding of the slider portion causes the shutter plates 16a, 16a
b is configured to open and close the opening 14 and the head insertion hole 15 at the same time.

The length of the slider portion 17 of the shutter / slider integrated structure 30 (the length measured in the sliding direction of the slider portion) is as long as possible in order to ensure a smooth and reliable opening and closing operation of the shutter. Preferably, the shutter plate is formed longer than the width of the shutter plate (the length measured along the sliding direction of the slider portion).

FIG. 3 is a perspective view showing an example of the shape of the slider portion of the shutter / slider integrated structure, omitting one of the shutter plates. FIG. FIG. 4 is a perspective view showing an example of a shape near an end, and shows a front end and a rear end of a slider portion 17 of a shutter / slider integrated structure 30 (the direction in which the shutter moves when closing the head insertion hole is forward; The upper half 11 and the lower half 12 are engaged with engaging portions 21 and 22 made of ribs and / or grooves formed along the insertion side end portion 19 on opposing inner surfaces of the upper half 11 and the lower half 12. Engagement structures 23 and 24 for slidably holding the slider integrated structure are formed.

Further, the upper half and lower half outer shell peripheral portions 1A and 2A and the upper half and lower half disk medium outer peripheral protection walls 1B and 2B are shown in FIGS.
A conventional attachment structure as shown in FIG.
Instead of (1)), the upper half 11 is formed by various in-roof structures that overlap each other, and is formed by torsional stress generated when screws are screwed by the conventional upper half and lower half screws. In addition, the problem of displacement of the lower half 12 can be completely prevented. Further, as shown in FIG. 9, the holding plate 50 at the lower portion of the shutter of the shutter / slider integrated structure, which was conventionally attached as a separate component, is moved to the position shown in FIG.
a, 2b) and (3a, 3b), as a part of the upper half 11 and / or the lower half 12 by integral molding, the shutter lower pressing plate 50, which was conventionally a separate part, can be double-sided. It is possible to omit the step of bonding with a tape or the like. In particular, since the shutter / slider integrated structure used in the present invention is manufactured by injection molding or the like, the material is a synthetic resin. Therefore, from the viewpoint of its rigidity, both the halves have a shutter lower portion of the shutter / slider integrated structure. Pressing plate 50
It is extremely effective to provide a single-piece structure.

A front slider portion stator 23 and a front slider press-fitting slot 25 are provided at the front of the slider portion 30 of the shutter / slider integrated structure, and a rear slider lower stator 27 and a rear slider press-fit are provided at the rear. A structure in which a slot portion 24 is provided, and further, the front slider lower stator 23 is fitted into the shutter closing direction slider guide groove 21 and the rear slider lower stator 27 is fitted into the shutter opening direction slider guide groove 22 so as to be freely movable in the front-rear direction. did. Further, FIGS. 5 and 6 show the engagement state between the engagement structure portions formed at the front end and the rear end of the slider portion 17 and the engagement portions formed on the opposing inner surfaces of the upper and lower halves, respectively. (A cross-sectional view in a plane perpendicular to the sliding direction of the slider portion), the front end portions (front end portions in the direction toward the center of the cartridge case) 25 and 26 of each engagement structure portion are: The thickness of the tip of the engagement structure portion (thickness measured along the thickness direction of the cartridge case) has a shape that gradually decreases toward the center of the cartridge case, and after assembling the cartridge case, The engaging structure was manufactured so as to be able to be extremely easily inserted into the engaging portions formed on the opposed inner surfaces of the upper and lower halves.

The rear end 27 of the slider 17 is engaged with the tip of one arm of a torsion coil spring 18 as shown in FIG. After the shutter / slider integrated structure is attached to the cartridge case and the torsion coil spring 18 is attached, the shutter plate can be urged to close the opening. . Further, when the torsion coil spring 18 is attached to the rear end portion 27 of the slider portion 17 or when the slider portion slides, movement of portions other than the distal end portion of one arm portion of the torsion coil spring 18 is prevented. It is preferable that a split groove is formed so as not to be formed.

The torsion coil spring 18 is provided with a symmetrical spring arm 18A and a spring fixing part 18C, and a spring coil 18B at the center so as to have a symmetrical structure with respect to the center. It is possible to omit the left and right checking work at the time.

According to the present invention, in order to increase the strength of the shutter portions 16a and 16b of the shutter / slider integrated structure mounted on the disk cartridge as described above, FIG.
As shown in (a) to (h), the strength of the shutter portion is improved by forming a part of the shutter portion with irregularities in the same direction and / or in the opposite direction with respect to the disk cartridge case. is there. FIGS. 11A to 11E show cross-sectional shapes of the shutter / slider integrated structure taken along a plane (aa ′) perpendicular to the sliding direction of the slider portion.
FIGS. 11F to 11H show cross-sectional shapes of the shutter plate of the shutter / slider integrated structure, taken along a plane (bb ′) parallel to the sliding direction of the slider portion. That is, in the shutter / slider integrated structure used in the present invention, the thickness of the shutter plate itself is increased by forming a convex portion or a concave portion having a shape as shown in FIG. 11 on the plate surface of the shutter plate. However, the strength can be increased, thereby making it possible to prevent the occurrence of such a problem that the shutter plate rises from the surface of the cartridge. The irregularities formed on the shutter plate are not limited to those shown in FIG. 11, but may be formed as a linear pattern. Further, these irregularities may be formed on only one of the two shutter plates. Or both.

The thickness of the shutter portion of the shutter / slider integrated structure is not particularly limited. However, from the viewpoints of strength improvement, moldability, and disc cartridge specifications, the thickness of the shutter portion is 0.3.
About 0.6 m is good.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is an exploded perspective view showing one embodiment of the disk cartridge of the present invention. As described above, this example is based on the conventional 3.5-inch magneto-optical disk cartridge conforming to the standard defined in JIS X 6272.
Instead of the shutter and the slider, a shutter-slider integrated structure in which they are integrally formed by injection molding of polyoxymethylene (POM) is used.
The basic shape and basic dimensions of the slider portion and the shutter plate of the shutter / slider integrated structure were the same as those used in the magneto-optical disk cartridge.

A disk cartridge containing a 3.5-inch magneto-optical disk as a disk-shaped recording medium 13 in a generally rectangular flat cartridge case 20 composed of an upper half 11 and a lower half 12 made of polycarbonate as shown in FIG. And the opening 1 formed in the cartridge case
Shutter plates 16a and 16b for opening and closing 4 and 15;
A shutter / slider integrated structure 30 is integrally formed by injection molding of polyoxymethylene (POM) with a slider portion 17 slidably provided along an end portion 19 of the cartridge case on the insertion side of the recording / reproducing apparatus. This provided a disk cartridge. As shown in FIG.
Upper half and lower half outer shell peripheral portions 1A and 2A and upper half and lower half disk medium outer peripheral protective walls 1B and 2A
B is not a conventional contact structure (FIG. 8- (1)) as shown in FIGS. 8- (2), (3), and (4), but is a variety of inserts which overlap each other. -Structure.

On the other hand, as shown in FIG. 3, the length of the slider portion 17 of the shutter / slider integrated structure 30 (the length measured along the sliding direction of the slider portion) is such that the shutter can be opened and closed smoothly and reliably. To ensure the operation, the shutter plate is formed longer than the width of the shutter plate (the length measured along the sliding direction of the slider portion), and the front end of the slider portion 17 of the shutter / slider integrated structure 30 is formed. The front and rear ends (the direction in which the shutter moves when the shutter closes the head insertion hole is defined as the front) are provided on the opposing inner surfaces of the upper half 11 and the lower half 12, as shown in FIG. Engaging structures 23 and 24 are formed to engage with engaging portions 21 and 22 formed of ribs and grooves formed along the portion 19 to slidably hold the shutter / slider integrated structure. I have.
A front slider portion stator 23, a front slider press-in slot 25, and a rear slider lower stator 27 and a rear slider press-in slot 24 are provided at the front of the slider portion 30 of the shutter slider integrated structure at the front. Further, the front slider lower stator 23 is formed in the shutter closing direction slider guide groove 21 and the rear slider lower stator 27 is formed in the shutter opening direction slider guide groove 22 so as to be freely movable in the front-rear direction.

Further, as shown in FIGS. 5 and 6, the distal ends (the distal ends in the direction toward the center of the cartridge case) 25 and 26 of these engaging structures are provided at the distal ends of the engaging structures. The thickness (thickness measured along the thickness direction of the cartridge case) has a shape that becomes gradually thinner toward the center of the cartridge case.

After assembling the cartridge case 20 with the magneto-optical disk stored therein, the engaging structure portions 23 and 24 formed at the front end and the rear end of the slider portion 17 of the shutter / slider integrated structure 30 are removed. When the cartridge structure 20 is pushed into the cartridge case 20 from the side of the insertion side end 19 of the cartridge case, the thickness of the engagement structure tip portions 25 and 26 is formed so as to gradually decrease in the tip direction. It can be easily inserted between the upper and lower halves, and can be engaged with the engaging portions 21 and 22 formed on the inner surfaces of the upper and lower halves facing each other along the insertion side end 19 and formed of ribs and grooves. Thereby, the shutter / slider integrated structure can be slidably held along the insertion side end 19 of the cartridge case.

Thereafter, as shown in FIG. 10, a symmetrical spring arm 18A and a spring fixing part 18C are provided, and a torsion coil spring 18 provided with a spring coil part 18B at the center is inserted into the insertion end of the cartridge case 20. In one corner. The distal end of one arm of the torsion coil spring 18 is engaged with a spring engaging portion formed on the rear end 27 of the slider 17, and the shutter plates 16a and 16b are
5 was urged so as to close it, thereby producing a disk cartridge.

Further, (2a, 2b), (3a,
As shown in 3b), the shutter portion lower holding plate 50 of the shutter / slider integrated structure was provided as a part of the upper half 11 and / or the lower half 12 by integral molding.

In order to increase the strength of the shutter portions 16a and 16b of the shutter / slider integrated structure mounted on the disk cartridge, the shutter portions 16a and 16b have a thickness of 0.5 mm and are shown in FIGS. When a part of the shutter portion is formed so as to have irregularities in the same direction and / or in the opposite direction with respect to the disk cartridge case, the bending strength is 1.0 to 1.4 when the flatness is flat. Increased by a factor of two.

[0029]

According to the disk cartridge of the present invention, the shutter plate and the slider are formed not integrally as separate parts, but the shutter plate and the slider are integrally formed.
By forming it as a slider integrated structure, the required number of parts can be reduced, and the assembling work of the disk cartridge can be extremely simplified.
Part of the shutter part of the shutter / slider integrated structure
By making the disk cartridge case uneven in the same direction and / or in the opposite direction to the disk cartridge case, its strength is secured, and it can be manufactured by injection molding, etc., with a thickness that matches the specifications of the disk cartridge. And could be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a conventional disk cartridge.

FIG. 2 is an exploded perspective view showing an embodiment of the disk cartridge of the present invention.

FIG. 3 is a perspective view showing a slider portion of the shutter / slider integrated structure of the embodiment, and an engagement structure portion formed at a front end and a rear end thereof.

FIG. 4 is a perspective view showing an engagement portion formed along the insertion side end on opposing inner surfaces of the upper and lower halves of the embodiment.

FIG. 5 is a partial cross-sectional view showing an engagement structure formed at a front end of a slider according to the embodiment.

FIG. 6 is a partial cross-sectional view showing an engagement structure formed at a rear end of the slider in the embodiment.

FIG. 7 is an internal structure diagram showing the upper and lower half shell outer peripheral portions and the disk medium outer peripheral portion protection wall of the embodiment. (A) Upper half, (B) Lower half

FIG. 8 is a perspective view showing a joint state between the outer peripheral portion of the upper and lower half shells and the protective wall of the outer peripheral portion of the disk medium according to the conventional example and the embodiment. (1) Conventional joint state, (2), (3), (4) Joint state of the present invention

FIG. 9 is a partial cross-sectional view showing a conventional shutter pressing plate and a shutter pressing portion formed by integral molding.
(1) Conventional shutter holding plate, (2a, 2b) and (3a, 3b) shutter holding portion formed by integral molding

FIG. 10 is an explanatory diagram showing a shape of a spring according to the embodiment.

FIG. 11 is an explanatory view showing a shutter section of the shutter / slider integrated structure of the embodiment.

[Explanation of symbols]

 1, 11: Upper half 1A, 2A: Upper and lower half outer shell peripheral parts 1B, 2B: Disk medium outer peripheral part protective wall 11A, 12A: Shutter retainer of the embodiment 2, 12: Lower half 3, 13: Disk recording Medium 4, 14: Opening 5, 15: Head insertion hole 6: Shutter 16a, 16b: Shutter plate 7: Slider 17: Slider part 8, 18: Torsion coil spring 18A: Torsion coil spring arm 18C: Torsion coil spring fixing part 18B: Torsion Coil spring part 9, 19: Insertion side end part 10, 20: Cartridge case 21, 22: Engagement part 23, 24: Engagement structure part 25, 26: Engagement structure part tip part 27: Slider part rear end part 30: Shutter / slider integrated structure 40: Screw 50: Conventional shutter-holding plate

Claims (5)

[Claims] 1. A disk-shaped recording medium is rotatably housed in a cartridge case comprising an upper half and a lower half.
At least one of the upper and lower halves has a head insertion hole for exposing at least a part of the recording surface of the disk-shaped recording medium, and the disk cartridge cable
A disk unit having a slider / slider integrated structure integrally formed with a slider portion slidably provided along one end of the slider and a shutter plate for opening and closing the head insertion hole by sliding the slider portion. -The disk cartridge, wherein the shutter portion of the shutter / slider integrated structure has irregularities in the same direction and / or in the opposite direction to the disk cartridge case. 2. The disk cartridge according to claim 1, wherein the shutter / slider integrated structure is formed by integral molding of a synthetic resin. 3. A shutter / slider integrated structure, wherein an engaging portion formed of ribs and / or grooves formed on opposing inner surfaces of said upper and lower halves, and said engaging formed on a slider portion of said integrated structure. 3. The disk cartridge according to claim 1, wherein said cartridge case is slidably held along one end of said cartridge case by an engaging structure portion engaging said portion. 4. The shutter / slider integrated structure has a slider portion having a length longer than a width of a shutter plate, and the engagement structure portion is formed at a front end and a rear end of the slider. The disk cartridge according to claim 3, wherein: 5. A front end portion of an engaging structure formed at a front end and a rear end of a slider portion of a shutter / slider integrated structure, after the cartridge case is assembled, the engaging structure is moved up and down by half. The thickness of the distal end portion of the engaging structure portion is gradually reduced toward the center of the cartridge case so that the engaging portion can be inserted into the engaging portion formed on the opposed inner surface of the cartridge case. 5. The disk cartridge according to claim 4, wherein