JPH07296544A - Disk cartridge - Google Patents

Abstract

PURPOSE:To provide a disk cartridge capable of preventing the end part of a shutter for opening/closing an opening window from being floated and turned up by devising the shape of the shutter without using any special parts. CONSTITUTION:An opening window 17 (32) for exposing a part of an information recording disk 15 housed in a shell housing 11 is provided on one plane thereof. By bending both end parts a shutter member for forming a shutter 20 for opening/closing the opening window 17 (32) in a longitudinal direction in a U-shape in the same planar direction, an opening/closing part 20a capable of opening/closing the opening window 17 and a pair of bending parts 20b and 20c continuing from both ends thereof are provided. One bending part 20b is engaged with one side surface part of the shell casing 11, the other bending part 20c is engaged with the other side surface part of the shell housing 11 and the shutter 20 is attached so as to be straddled over the shell casing 11.

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 rotatably accommodating an information recording disk such as an optical disk, a magneto-optical disk or a magnetic disk used for recording, reproducing or recording / reproducing information. The present invention relates to a shutter for opening / closing an opening window in which a recording / reproducing or recording / reproducing head (pickup) for writing / reading is written.

[0002]

2. Description of the Related Art Conventionally, as a disk cartridge in which an opening window for receiving a recording / reproducing head (pickup) for writing information on an information recording disk is generally opened and closed by a shutter, for example, Figure 20
Also, there is one as shown in FIG.

In FIGS. 20 and 21, reference numeral 1 denotes a shell housing, which is composed of a pair of front and back surface shells 2 and back surface shells 3 which are superposed on each other. An information recording disk 4 such as an optical disk is rotatably accommodated inside the shell housing 1, and an opening window 5 for receiving a pickup for writing information on the information recording disk 4 is provided. It is provided on the back shell 3. The opening window 5 of the back shell 3 is configured to be opened and closed by a shutter 6 movably attached to the shell housing 1.

The shutter 6 is a long and thin metal plate L
The opening window 5 of the back shell 3 is opened and closed by being bent into a letter shape, and the one opening / closing portion 6a is opened and closed. At the tip of the opening / closing portion 6a, there is formed a buoyant retaining portion 6b bent in a crank shape, and the buoyant retaining portion 6b is movably inserted into a guide groove 7 provided in the shell casing 1. By pressing the floating portion 6b with the pressing plate 8 fitted in the guide groove 7, it is possible to prevent the tip end side of the opening / closing portion 6a from being lifted up and to easily turn over due to a weak force, and to prevent dust on the information recording disk 4. It prevents the deterioration of the product and the occurrence of damage.

On the other hand, a side surface portion 6c formed by continuously bending 90 degrees at the other end of the opening / closing portion 6a is arranged so as to face the side surface of the shell casing 1 where the front shell 2 and the back shell 3 overlap each other. ing. Then, the floating plate 6d formed at the tip of the opening / closing part 6a is movably engaged with one side surface of the surface shell 2 to thereby move the side plate 6c of the shutter 6.
It prevents the side from turning over and coming off.

[0006]

However, in the conventional disk cartridge as described above, the pressing plate 8 is fitted in the guide groove 7 of the shell casing 1 and is movably held in the shell casing 1. By pressing the floating retaining portion 6b at the tip of the opening / closing portion 6a of the shutter 6 with the pressing plate 8, the structure such that the opening / closing portion 6a is prevented from rising or curling up is formed. For this reason, a special part called the presser plate 8 is required, and the number of parts is large, which is uneconomical, and the number of steps for attaching the presser plate 8 to the shell housing 1 is increased. It was

The present invention has been made in view of such conventional problems, and by devising the shape of the shutter without using special parts, the end of the shutter for opening and closing the opening window is lifted or turned up. It is intended to provide a disc cartridge that does not have a problem.

[0008]

In order to solve the above-mentioned problems and the like and to achieve the above-mentioned objects, the present invention provides an information recording disk 1 as shown in FIGS. 1 to 13, for example.
A pair of front and back shells 12, 13 in which 5 is rotatably accommodated
An opening window 17 (32) that exposes a portion that extends radially outward from the vicinity of the central hole 16 that is the rotation center of the information recording disk 15 and reaches the vicinity of the outer peripheral edge on one plane of the shell housing 11 made of The opening window 17 (3
2) A shutter member that holds a shutter 20 that can be opened and closed so as to be movable in the shell housing 11, and the shutter 20 has a length that extends from one side surface portion of the shell housing 11 to the other side surface portion opposite to the side surface portion. The shutter member has an opening / closing portion 20a capable of opening / closing the opening window 17 (32) by bending both longitudinal ends of the shutter member in the same plane direction.
And a pair of bent portions 20b and 20c that are continuous at both ends of the opening / closing portion 20a in the longitudinal direction. One bent portion 20b of the shutter 20 is engaged with one side surface portion of the shell casing 11 and the shutter 20 is provided. The other bent portion 20c is engaged with the other side surface portion of the shell casing 11, and the shutter 20 is attached so as to straddle the shell casing 11.

The disk cartridge of the present invention is
For example, as shown in FIGS. 14 to 19, a pair of front and back shells 3 in which an information recording disk 15 is rotatably accommodated
Shell housing 33 (4 consisting of 4, 13 (57, 58)
8) A pair of front and back opening windows 35, 17 are provided on both planes to expose a portion that extends radially outward from the vicinity of the central hole 16 that is the rotation center of the information recording disk 15 and reaches the vicinity of the outer peripheral edge. , A pair of front and back opening windows 35, 17
The shutter 40 (50) capable of opening and closing
The shutter 40 (50) is movably held at (48).
Is a shutter member having a length that reciprocates from one side surface portion of the shell housing 33 (48) to the other side surface portion that faces the shell housing 33 (48), and an intermediate portion in the longitudinal direction of the shutter member is bent into a U-shape. By this, the intermediate bent portion 41 (51)
And a pair of front and back opening / closing portions 42a, 42b (52a, 52b) continuous with both sides of the intermediate bent portion 41 (51) and capable of opening and closing the pair of front and back opening windows 35, 17 are provided.
A pair of end bending portions 43a, 43b (53a, 53b) are provided by bending the opening-side ends of the pair of front and back opening / closing portions 42a, 42b (52a, 52b) inwardly to form a U-shape. ) Is engaged with one side surface of the shell casing 33 (48) and the pair of end bent portions 43a, 43 of the shutter 40 (50).
The shutter 40 (50) can be configured so that b (53a, 53b) is engaged with the other side surface of the shell casing 33 (48) and the shell casing 33 (48) is wound.

Further, the disk cartridge of the present invention is
For example, FIGS. 1, 2, 9, 12, 14, and 17.
As shown in FIG. 7, a shutter opening / closing groove 23 extending in the moving direction of the shutter 20 (40, 50) is formed on one side surface of the shell casing 11 (33, 48), and the shutter opening / closing groove 23 is formed.
The shutter 20 (40, 50) is provided with a shutter opening / closing groove, in which an opening 25 that opens inside is provided, and a locking portion 24a faces the opening 25 to rotatably support the lock arm 24. The lock claw 21d that is inserted into the locking portion 23a and is detachably locked to the locking portion 24a is provided.
When the opening window 17 (32, 35) is closed by (40, 50), the lock claw 21d is locked by the lock arm 24 to lock the shutter 20 (40, 50).

The disk cartridge of the present invention is, for example, as shown in FIGS. 2 to 4 and 9 to 13.
Stepped portions 19a and 19b extending in the moving direction of the shutter 20 are provided on the outer surfaces of the left and right side surface portions of the surface shell 12 without the opening window 17 of the shell casing 11, and these stepped portions 19a and 19b are provided.
The pair of bent portions 20b and 20c of the shutter 20 may be movably engaged with the floating stoppers 21b and 22b at the tip b.

Furthermore, the disc cartridge of the present invention has a step portion 30 (3) as shown in FIGS.
1) can be provided on the inner surfaces of the left and right side surface portions of the shell casing 11, respectively.

The disk cartridge of the present invention is
For example, as shown in FIGS. 14 to 16, the shell housing 33
A step portion 46 extending in the movement direction of the shutter 40 is provided on the inner surface of one side surface portion of the shutter 40, and a floating retaining piece 45a at the tip of the end bent portion 43a of the shutter 40 on the surface shell 34 side and the back surface shell 1 are provided.
The buoyancy prevention piece 45b at the tip of the end side bent portion 43b on the side 3
Can each be engaged with.

Further, the disk cartridge of the present invention is
For example, as shown in FIGS.
A pair of front and back step portions 56a, 56b extending in the moving direction of the shutter 50 are provided on both front and back outer surfaces of one side surface portion, and the floating piece 45a at the tip of the end bent portion 43a on the front surface shell 57 side of the shutter 50 is attached to the back surface shell 58. It is also possible to engage with the stepped portion 56b of the front shell 57 by engaging with the stepped portion 56b of the front surface shell 57 by engaging the floating portion 45b at the tip of the end bent portion 43b of the shutter 50 on the back shell 58 side.

The disk cartridge of the present invention has an opening window 32 as shown in FIGS. 9 to 11, for example.
Can be a continuous opening having a length that extends from one side surface portion of the shell housing 11 through the central hole 16 of the information recording disk 15 to the other side surface portion.

[0016]

The present invention has the above-mentioned configuration,
Since the shutter 20 is attached so as to straddle the shell housing 11 by engaging the pair of bent portions 20b and 20c that are bent in a U shape with both side surfaces of the shell housing 11, the end portion of the shutter 20 is lifted. In addition, the dustproof property when the opening window 17 is closed can be enhanced without easily flipping with a weak force.

Also, an intermediate bending portion 41 bent in a U-shape
(51) and a pair of end bent portions 43a, 43b (53a, 5
3b) is engaged with both side surfaces of the shell casing 33 (48) to wind the shell casing 33 (48).
0) is attached, the shutter 40 (50)
The edges of the do not rise or turn over,
Moreover, the opening windows 17 and 35 provided on both the front and back surfaces of the shell housing 33 (48) can be opened and closed at the same time.

Furthermore, when the opening window 17 (32, 35) is closed by the shutter 20 (40, 50), the shutter 20 (4
The lock claw 21d provided on the shell housing 11
The shutter 20 (40, 50) can be reliably locked by engaging the lock arm 24 supported by (33, 48).

The surface shell 12 of the shell housing 11
Since the step portions 19a and 19b are provided on the outer surfaces of the left and right side surface portions of the shutter 20, the shutter 20
The baffle pieces 21b and 22b at the tip of the bent portion of the above move.

Furthermore, the stepped portion 30 (31) is provided in the shell casing 1.
The shutter 2 is provided on the inner surface of the left and right side portions of the shutter 1.
The length of the side piece 22a of the bent portion 20c of 0 can be shortened.

Further, the step portion 46 is provided on the inner surface of one side surface portion of the shell casing 33, and the end bent portion 43a on the front surface shell 34 side of the shutter 40 and the end bent portion on the rear surface shell 13 side and the end retaining portion 45a on the front surface shell 34 side. 43b to the step 4
By engaging with 6 respectively, both buoyancy preventing pieces 45a and 45b move along this stepped portion 46.

Further, a pair of front and back step portions 56a, 56b are provided on both front and back outer surfaces of one side surface portion of the shell housing 48, and the end bent portion 53a of the shutter 50 on the surface shell 57 side.
The floating piece 55a at the front end is engaged with the step portion 56b of the back shell 58, and the end bent portion 5 of the shutter 50 on the back shell 58 side is engaged.
The float retaining piece 55b at the tip of 3b is attached to the step 56 of the surface shell 57
By engaging with a, both buoyancy prevention pieces 45a and 45b move along these step portions 56a and 56b.

The opening window 32 is a continuous opening having a length that extends from one side surface portion of the shell housing 11 through the central hole 16 of the information recording disk 15 to the other side surface portion. Two pickups can be inserted into the window 32 at the same time, and the two pickups can simultaneously record and reproduce independently.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention, FIG. 5 and FIG.
Is the second embodiment of the present invention, FIGS. 7 and 8 are the third embodiment of the present invention, FIGS. 9 to 11 are the fourth embodiment of the present invention, and FIGS. 12 and 13 are the fifth embodiment of the present invention. 14 to 16 show a sixth embodiment of the present invention, and FIGS. 17 to 19 show a seventh embodiment of the present invention.

2, FIG. 9, FIG. 12, FIG. 14 and FIG.
In FIG. 7, an arrow X indicates the moving direction of the disc cartridge with respect to the drive device when the disc cartridge is mounted in a predetermined drive device for use. Therefore, in the following embodiments, the left side of FIG. 2 and the like will be described as the front surface, the right side as the rear surface, the upper side as the left side surface, and the lower side as the right side surface.

1 to 4 showing the first embodiment, 1
Reference numeral 1 is a shell casing formed of a synthetic resin having appropriate rigidity (for example, PP (polypropylene), ABS (acrylonitrile butadiene styrene resin), HIPS (high impact polystyrene), etc.). The shell casing 11 is composed of a pair of a front shell 12 and a rear shell 13 which are superposed on each other. A disk accommodating portion 14 formed of a rectangular plate-like space is formed inside the shell housing 11, and an information recording disk 15 such as an optical disk, a magneto-optical disk, or a magnetic disk is formed in the disk accommodating portion 14. It is rotatably housed.

An opening is formed in the plane of the back shell 13 of the shell housing 11 so as to expose a portion that extends radially outward from the vicinity of the central hole 16 that is the rotation center of the information recording disk 15 and reaches the vicinity of the outer peripheral edge. A window 17 is provided. That is, the opening window 17 extends from the central portion of the shell casing 11 to the left side surface portion, and the outer surface of the shell casing 11 is associated with the opening window 17 and extends from the plane of the back shell 13 to both side surfaces to the front surface shell. A concave portion 18 having a U-shaped cross section is provided so as to reach the left and right side surfaces of 12.

The recess 18 has a predetermined width that extends from the central portion of the shell casing 11 including the opening window 17 to the vicinity of the rear surface, and the predetermined width is set to be slightly wider than twice the width of the opening window 17. There is. Step portions 19a and 19b each having a predetermined width are formed at the left and right edge portions of the surface shell 12 that are continuous with the recessed portion 18 on the plane side. The shutter 20 is formed in the concave portion 18 having such a shape.
Is movably held, and the opening window 17 is opened and closed by the movement of the shutter 20.

The shutter 20 is a long thin plate-like member having a length that extends from the left side surface which is one side surface portion of the shell casing 11 to the right side surface which is the other side surface portion opposite to the side surface portion and which exceeds the left side surface. It consists of a shutter member. Then, by bending both ends in the longitudinal direction of the shutter member in a U-shape in the same plane direction, an opening / closing part 20a located on the plane side of the back shell 13 for opening / closing the opening window 17 and the opening / closing part 20a. A pair of bent portions 20b and 20c which are continuous at both ends are provided. The pair of bending portions 20b and 20c are the opening / closing portion 2
0a is formed on one surface side so as to face each other,
One bent portion 20b has a side piece 21a and a floating piece 21b, and the other bent portion 20c has a side piece 22a and a floating piece 22b.

The side piece 21a of the one bent portion 20b is formed by being bent 90 degrees continuously from one end of the opening / closing portion 20a so as to face the left side surface of the shell casing 11.
Then, the floating piece 2 is continuously attached to the tip of the side piece 21b.
1b is formed by bending 90 degrees so as to face one step portion 19a of the surface shell 12. Further, the side surface piece 22a of the other bent portion 20c is continuous with the other end of the opening / closing portion 20a so as to face the right side surface of the shell casing 11.
It is formed by bending at 0 degree. This side piece 22
a is composed of two parts that are left thinly cut back and forth by notching the inside of the end into a square shape.
22a, 22b, 22b,
b is formed by bending 90 degrees so as to face the other step portion 19b of the surface shell 12.

Further, one bent portion 20b of the shutter 20
Has a protruding piece 2 protruding in a direction intersecting the longitudinal direction thereof.
1c is provided continuously to the side piece 21a. And
By bending the tip of the protruding piece 21c in the same direction as the floating piece 21b, the lock claw 21d protruding inward is formed.

The shutter 20 having such a shape is
One bent portion 20b having the side piece 21a and the floating piece 21b is fitted into the left side surface of the shell casing 11, and the pair of side pieces 21a, 21a and the floating pieces 21b, 21b are also fitted.
By fitting the other bent portion 20c having the above into the right side surface of the shell casing 11, it is attached to the recessed portion 18 of the shell casing 11. As a result, in the shutter 20 with respect to the shell casing 11, the opening / closing portion 20a is along the plane of the back shell 13 of the shell casing 11, and the side pieces 21a, 2a at both ends are provided.
2a extends along the side surfaces of the front and back shells 12 and 13, and each of the floating stoppers 21b and 22b is a step portion 19 of the front shell 12.
It is possible to smoothly move (slide) along a and 19b in the moving direction X of the disk cartridge, which is the direction intersecting the longitudinal direction thereof.

Further, a shutter opening / closing groove 23 extending in the moving direction X and penetrating from the front surface to the rear surface is formed in a mating surface portion of the front surface shell 12 and the rear surface shell 13 on the left side surface of the shell casing 11. The shutter opening / closing groove 23 is formed in a rectangular groove shape by notching the inner surface of the end of the front shell 12 and the inner surface of the end of the back shell 13 equally. The lock claw 21d of the shutter 20 is inserted into the shutter opening / closing groove 23. And this lock claw 21d
Corresponding to the above, a lock arm 24 for locking the shutter 20 by hooking the lock claw 21d is rotatably attached to the shell housing 11.

The lock arm 24 has a locking portion 24a, which is a recess for locking the lock claw 21d, and the shutter opening / closing groove 23 is exposed to expose the locking portion 24a in the shutter opening / closing groove 23. The disc housing 1 on the bottom
The opening 25 communicating with the No. 4 is formed. This opening 2
Reference numeral 5 denotes an opening at a position facing the lock claw 21d when the opening window 17 is closed by the shutter 20.
It is rotatably supported by a pivot shaft 26 provided on the shaft 1. Further, the lock arm 24 is provided with a spring member 27, and the spring force of the spring member 27 causes the locking portion 2 to move.
4a is constantly urged toward the lock claw 21d. 28
Is a stopper for locking the tip of the spring member 27 and applying a force to the lock claw 21d side to the lock arm 24.

A pivot 26 for supporting the lock arm 24
Is the shell casing 1 rather than the locking portion 24a of the lock arm 24.
1 is provided on the front side of the locking unit 24a and the pivot 2
An input portion 24b formed of an inclined surface is formed between the input portion 24 and the input portion 6. This input unit 24b is provided with a release pin 2 provided on the drive device when it is attached to the drive device not shown.
9 is abutted, and the pressing force of the release pin 29 rotates the lock arm 24 against the biasing force of the spring member 27 so as to be pushed back into the disk accommodating portion 14. As a result, the locking portion 24a is disengaged from the lock claw 21d, the locked state is released, and the shutter 20 can be moved.

Further, a guide portion 24c, which is an inclined surface opposite to the input portion 24b, is formed on the tip side of the locking portion 24a of the lock arm 24. This guide part 24c
Lock claw 21d when the shutter 20 closes the opening window 17
Are in contact with each other, and the lock claw 21d is provided in the guide portion 2
4c slides under the guidance of 4c and can easily enter the locking portion 24a.

As the material of the shutter 20 having the above structure, for example, stainless steel or other metal material can be used. In addition to this, a synthetic resin {for example, PP is used.
(Polypropylene), POM (Polyacetal), PE
Various materials such as (polyethylene) can be used. When a metal material is used, it can be easily manufactured by pressing or the like, and when a synthetic resin material is used, it can be easily manufactured by injection molding or the like.

When the shutter 20 is assembled in the shell casing 11, since the buoyant pieces 21b and 22b at both ends project inward, one buoyant piece 21b (or 22b) becomes an obstacle. By forming the shutter 20 with a metal plate or a synthetic resin plate as described above, the shutter 20 can be easily incorporated by utilizing its own elasticity. That is, the shutter 2
0 is elastically deformed into an arc shape to expand the open sides of both ends to the outside (only one end may be expanded), and the recessed part 18 is fitted from the open side to the shell casing 11. The shutter 20 can be easily assembled.

According to the disk cartridge having such a structure, as shown in FIG. 2, when the shutter 20 is located at the center of the shell casing 11, the pickup for writing and reading information is exposed. Since the opening window 17 is closed by the opening / closing portion 20a of the shutter 20, dust, dust and the like do not enter the disc housing portion 14 through the opening window 17. Moreover, the floating stoppers 21b and 22b provided at both ends of the shutter 20 in the longitudinal direction.
Are steps 19a and 19b provided on both sides of the shell casing 11.
Since they are engaged with each other, both ends in the longitudinal direction thereof do not rise or turn up, and therefore the built-in information recording disk 15 can be reliably protected. Further, the shutter 20 has its lock claw 21d.
Is locked by being locked by the locking portion 24a of the lock arm 24, the dustproof property can be secured without being easily opened by an external force such as vibration.

Next, when the present disk cartridge is mounted on the drive device and the lock arm 24 is pushed back into the opening 25 by the release pin 29 on the drive device side to unlock the lock claw 21d by the locking part 24a, the shutter is released. Two
Zero slides are possible. As a result, the release pin 29
When the lock claw 21d is pressed with and the shutter 20 is slid to the rear side, the opening window 17 is opened and a part of the information recording disk 15 is exposed. Therefore, by exposing the pickup to this exposed portion, the information recording disk 15
It becomes possible to read the information recorded in
It becomes possible to write information on the information recording disk 15.

In this case, since the bent portions 20b and 20c provided at both ends of the shutter 20 are engaged with the side surface portions on both sides of the shell casing 11, the shutter 2 is slid during sliding.
The end portion of 0 does not float up and is not easily turned up with a weak force, and the slide operation can be performed while ensuring the dustproof property. In addition, the shape of the shutter 20 itself prevents the end portion from rising, and does not require a separate member for pressing the end portion as in the conventional case. Can bring down.

The second embodiment shown in FIGS. 5 and 6 and the third embodiment shown in FIGS. 7 and 8 are stepped portions 19b for guiding the pair of floating stoppers 22b, 22b provided at the other end of the shutter 20. 10 shows another embodiment of the above.

That is, in the second embodiment, the stepped portion 30 is provided on the mating surface side, which is the inner surface of the side surface portion of the surface shell 12, to form the guide groove of the floating retaining piece 22b. In this manner, the floating portion 22b of the other bent portion 20c may be fitted into the step portion 30 of the front shell 12 and the floating portion 22b may be movable along the mating surface of the back shell 13.
In addition, in the third embodiment, the guide groove is formed by providing the step portion 31 on the mating surface side which is the inner surface of the side surface portion of the back shell 13. In this way, the floating portion 22b of the other bent portion 20c can be fitted into the step portion 31 of the back shell 13 and the floating portion 22b can be configured to be movable along the step portion 31. Then, the stepped portions 30, 31 having such a shape
Also, the same effect as that of the above embodiment can be obtained.

The fourth embodiment shown in FIGS. 9 to 11 is
The opening window 17 in the first embodiment is widened in the longitudinal direction of the shutter 20. The opening window 32 shown in the fourth embodiment extends linearly from one side surface portion of the shell housing 11 so as to reach the other side surface portion through the vicinity of the center hole 16 of the information recording disk 15. . The disc cartridge of the fourth embodiment is such that recording / reproducing can be performed at two places on the left and right sides of the disc at the same time, and two pickups, a recording pickup and a reproducing pickup, can be inserted into the opening window 32 at the same time. it can. Other configurations and effects are similar to those of the first embodiment.

In this case, according to this embodiment, the opening window 32
The purpose and the size of the shutter 20 are the same as those of the first embodiment, and the shape and size of the shutter 20 need not be changed at all. Therefore, it can be said that it has the most effective form as a single-sided type disk cartridge used in a drive device having two pickups on one side.

The fifth embodiment shown in FIGS. 12 and 13 is the lock claw 21d and the lock arm 2 in the first embodiment.
The position of 4 is changed up and down with respect to FIG.
It is placed on the opposite side of. Other configurations, operations and effects are the same as those of the first embodiment.

According to this embodiment, contrary to the first embodiment, the opening / closing operation of the shutter 20 can be performed from the side opposite to the opening window 17. In general, an ordinary drive device employs a structure in which a pickup is inserted into the opening window 17 side of the cartridge. Therefore, in some cases, the mechanism of the drive device can be simplified by performing the opening / closing operation of the shutter 20 on the opposite side of the opening window 17, and the disk cartridge according to the present embodiment is a drive device having such a structure. It is suitable for use in.

The sixth embodiment shown in FIGS. 14 to 16 is a double-sided type disk cartridge capable of simultaneously recording and reproducing from both front and back surfaces of the shell casing 33. The basic structure of this disk cartridge is the same as that of the first embodiment shown in FIG. 1 and the like, the back shell 13 and the lock arm 24 are exactly the same, but the front shell 34 and the shutter 40 are structurally different. This is different from the first embodiment.

That is, the surface shell 34 has the same shape as the surface shell 12 and is formed in a shape symmetrical to the front and back surfaces of the back shell 13. The front shell 12 has an opening window 17 of the back shell 13. An opening window 35 having a target shape is formed at a corresponding position. The concave portion 36 of the shell casing 33 is continuous with the plane of the surface shell 34 and is formed in an annular shape as a whole. Such shell housing 3
A shutter 40, which is continuous in a substantially annular shape, is movably mounted in the recessed portion 35 of No. 3.

The shutter 40 is a long thin plate-like member that reciprocates from one side surface portion of the shell casing 33 to the other side surface portion facing the shell casing 33 and has a length exceeding this, and its longitudinal direction. The middle bent portion 41 is formed by bending the middle portion of the above into a U-shape. As a result, a front side opening / closing section 42a and a back side opening / closing section 42b are formed on both sides of the intermediate bending section 41 so as to be bent 90 degrees and face each other. Then, by bending the tips of the opening / closing portions 42a and 42b into a U-shape,
A pair of end bent portions 43a and 43b facing each other are formed on the front and back sides.

The pair of end bent portions 43a and 43b are
It is composed of two parts, which are thinly cut back and forth by notching the inside of each end into a square shape. One end bent portion 43a has a side piece 44a and a floating piece 45a,
The other end bent portion 43b has a side piece 44b and a floating piece 45b.
And have. Then, the side surface pieces 44a, 44b are
90 at one end of each opening / closing part 42a, 42b
These side pieces 44 consist of flat parts that are bent at a time.
Plane portions which are continuously bent at 90 degrees to the tips of the a and 44b form the levitation pieces 45a and 45b.

In order to receive the floating retaining pieces 45a and 45b of the pair of end bent portions 43a and 43b, the shell casing 33 is provided.
A step portion 46 extending in the sliding direction of the shutter 40 is provided on the mating surface portion of the front shell 34 and the back shell 13 on the side opposite to the shutter opening / closing groove 23. This step 4
6 is formed in a rectangular groove shape by notching the inner surface of the side surface portion of the front surface shell 34 and the inner surface of the side surface portion of the back surface shell 13 equally.

The shutter 40 having such a shape is
The intermediate bent portion 41 is engaged with the left side surface portion of the shell housing 33 having the shutter opening / closing groove 23, and the pair of end bent portions 4 are formed.
By engaging 3a and 43b with the other right side surface,
It is slidably held in the shell housing 33. As a result, the front side opening / closing part 42a of the shutter 40 is located on the plane side of the front surface shell 34 to open / close the opening window 35, and the back side opening / closing part 42b is located on the plane side of the back surface shell 13 to open / close the opening window 17. To do.

The middle bent portion 41 of the shutter 40 moves along the left side surface of the shell housing 33 where the shutter opening / closing groove 23 is provided, and the pair of end bent portions 43a and 43b moves along the right side surface. The buoyant piece 45a of the one end bent portion 43a moves along the groove surface on the surface shell 34 side of the step portion 46, and the buoyant piece 45b of the other end bent portion 43b moves to the back shell 13 of the step portion 46. Move along the side groove surface. Other configurations, operations and effects are the same as those in the above-mentioned embodiment.

According to this embodiment, the pair of end bent portions 43
Each of the floating stoppers 45a and 45b of a and 43b is one step 4
It is fitted in 6, and the floating pieces 45a and 45b move along the step 46. Therefore, since the flotation prevention pieces 45a and 45b, which are the end portions of the shutter 40, are hidden by being inserted into the step portion 46, the end portions do not rise or turn up, and a disc cartridge excellent in dustproof property is obtained. To be Moreover, the opening windows 17 and 35 are formed on both the front and back surfaces of the shell casing 33, and these are the shutters 40 and 35.
Since it is opened and closed at the same time, two pickups can be brought close to the information recording disk at the same time from two positions on the front and back sides, and recording and reproduction can be performed independently at the same time.

The seventh embodiment shown in FIGS. 17 to 19 shows another specific example of how to receive the end portion of the shutter 40 shown in the sixth embodiment. In the shutter 50 shown in the seventh embodiment, the side surface pieces 44a and 44b described in the sixth embodiment are extended, and the floating portions 45a and 45b at the ends thereof are received by the outer surface of the side surface portion of the shell casing 48. Is.

That is, the shutter 50 has the intermediate bending portion 5
1 and a pair of front and back opening / closing portions 52a and 52b, a pair of end bending portions 53a and 53b, a pair of front and rear side pieces 54a and 54b, and a pair of floating retaining pieces 55a and 55b. 40 is the same as that of FIG. 40 except that the floating piece 55 of the end bent portion 53a on the surface shell 57 side is different.
a is received by the step portion 56b provided on the outer surface of the side surface portion of the back shell 58, and the floating retaining piece 5 of the end bent portion 53b on the back shell 58 side is received.
Step portion 56a in which 5b is provided on the outer surface of the side surface of the surface shell 57
This is the point I chose to receive. For this reason, both floating retaining pieces 5
5a and 55b are set to be staggered in the front-rear direction. Other configurations and operations are similar to those of the above-described embodiment, and with such a configuration, the same effect as that of the above-described sixth embodiment can be obtained.

As described above, the present invention is not limited to the above-mentioned embodiment, but various modifications can be made without departing from the spirit of the present invention.

[0059]

As described above, according to the first aspect of the present invention, both ends of the shutter member in the longitudinal direction are bent in a U shape to provide the opening / closing portion and the pair of bending portions, and one of the bending portions is bent. Since the shutter is mounted so as to straddle the shell housing by engaging the side portion with one side surface portion of the shell housing and the other bent portion with the other side surface portion of the shell housing, the end of the shutter is attached. It is economical because the part does not float up and easily flips with a weak force, and the parts for pressing the end part of the shutter and the assembly man-hours are unnecessary, and the opening window is closed. It is possible to provide a disc cartridge having excellent dustproof property. Further, since the shutter is mounted so as to straddle the shell casing, there is an effect that the shutter can be opened and closed by using either side, and the degree of freedom in the configuration of the drive device is increased.

According to the second aspect of the present invention, the intermediate portion in the longitudinal direction of the shutter member is bent in a U shape to provide an intermediate bent portion and a pair of opening / closing portions, and the opening side of each opening / closing portion. End portions of the shell are bent into a U-shape to provide a pair of end bent portions, the middle bent portion is engaged with one side surface portion of the shell casing, and the pair of end bent portions is connected with the other side surface portion of the shell casing. Since the shutter is attached so that the shell housing is wound by being engaged with the shell housing, in addition to the above effect, it is possible to simultaneously open and close the opening windows provided on both front and back surfaces of the shell housing. Therefore, two pickups can be exposed to the information recording disc from both the front and back sides at the same time, and a disc cartridge suitable for use in a drive device that simultaneously independently records and reproduces at two locations on both sides can be provided. it can.

Further, according to the third aspect of the invention, a shutter opening / closing groove and an opening are provided on one side surface of the shell casing to rotatably support the lock arm, and the shutter is provided with a lock claw. Thus, when the opening window is closed by the shutter, the lock claw can be locked by the lock arm to lock the shutter, and it is possible to provide the disc cartridge in which the shutter is not opened accidentally.

Further, according to the invention described in claim 4, step portions are respectively provided on the outer surfaces of the left and right side surfaces of the surface shell of the shell housing, and the step portion is provided with a retaining piece at the tip of the pair of bent portions of the shutter. Since each of them is movably engaged, the shape and structure of the shutter and the shell casing according to the first aspect of the invention can be simplified.

Further, according to the invention described in claim 5, since the step portion is provided on each of the inner surfaces of the left and right side surfaces of the shell casing, the length of the side surface piece of the bent portion of the shutter having a simple shape is reduced. Can be shortened.

According to the sixth aspect of the invention, the stepped portion is provided on the inner surface of one side surface portion of the shell casing, and the floating retaining piece at the tip of the end bending portion on the front surface shell side of the shutter and the back surface shell side are provided. Since the floating stoppers at the ends of the bent end portions are respectively engaged with the stepped portions, the shape and structure of the shutter and shell casing according to the second aspect of the invention can be simplified.

Further, according to the invention described in claim 7, a pair of front and back step portions are provided on both front and back outer surfaces of one side surface portion of the shell casing, and a floating retaining piece at the tip of the end bent portion on the surface shell side of the shutter. 3. The shutter and shell according to claim 2, wherein the shutter is engaged with the step portion of the back shell, and the buoyant piece at the tip of the end bent portion on the back shell side of the shutter is engaged with the step portion of the front shell. The shape of the housing can be realized by another simple structure.

According to the eighth aspect of the invention, the opening window is formed as a continuous opening having a length reaching from one side surface portion of the shell housing to the other side surface portion through the center hole of the information recording disk. Therefore, the opening window can be set longer than the diameter of the disc. Therefore, 2 on one side of the disc
It is possible to provide a disc cartridge in which two pickups can be inserted into the same location at the same time, and two pickups can be simultaneously and independently recorded / reproduced from one side.

[Brief description of drawings]

FIG. 1 is an external perspective view of a first embodiment of the present invention viewed from the back surface side.

FIG. 2 is a bottom view of the same.

FIG. 3 is a side view of the same.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a side view showing a second embodiment of the present invention.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a side view showing a third embodiment of the present invention.

8 is a sectional view taken along line CC of FIG.

FIG. 9 is a bottom view showing the fourth embodiment of the present invention.

FIG. 10 is a side view of the same.

11 is a cross-sectional view taken along the line DD of FIG.

FIG. 12 is a bottom view showing the fifth embodiment of the present invention.

13 is a cross-sectional view taken along the line EE of FIG.

FIG. 14 is a bottom view showing a sixth embodiment of the present invention.

FIG. 15 is a side view of the same.

16 is a sectional view taken along line FF of FIG.

FIG. 17 is a bottom view showing a seventh embodiment of the present invention.

FIG. 18 is a side view of the same.

19 is a sectional view taken along line GG of FIG.

FIG. 20 is an external perspective view of a conventional disc cartridge as seen from the back side.

21 is a cross-sectional view taken along the line HH of FIG.

[Explanation of symbols]

11, 33, 48 Shell housing 12, 34, 57 Front shell 13, 58 Back shell 14 Disc housing 15 Information recording disc 16 Center hole 17, 32, 35 Open window 18, 36 Recess 19a, 19b, 30, 31, 46, 56a, 56b
Step portion 20, 40, 50 Shutter 20a, 42a, 42b, 52a, 52b Opening / closing portion 20b, 20c Bending portion 21a, 22a, 44a, 44b, 54a, 54b Side piece 21b, 45a, 45b, 55a, 55b Floating piece 21d Lock claw 23 Shutter opening / closing groove 24 Lock arm 24a Locking part 25 Opening part 27 Spring member 28 Stopper 29 Release pin 41 Intermediate bending part 43a, 43b, 53a, 53b End bending part

Claims (8)

[Claims] 1. A flat surface of a shell housing composed of a pair of front and back shells in which an information recording disk is rotatably accommodated, and is radially outward from a vicinity of a center hole which is a rotation center of the information recording disk. An opening window that exposes a portion that extends to reach the vicinity of the outer peripheral edge is provided, and a shutter that can open and close the opening window is movably held in the shell housing, and the shutter is one side surface portion of the shell housing. From the shutter member having a length reaching the other side surface opposite to the shutter member, and the opening and closing portion capable of opening and closing the opening window by bending both ends of the shutter member in the longitudinal direction in a U-shape in the same plane direction. And a pair of bent portions that are continuous at both ends of the opening / closing portion in the longitudinal direction. One of the bent portions of the shutter is engaged with one side surface portion of the shell housing and the other of the shutter is provided. The bent portion engages the other side of the shell casing, a disc cartridge, characterized in that fitted with the shutter so as to straddle the shell casing. 2. An information recording disk is rotatably accommodated in both planes of a shell housing consisting of a pair of front and back shells, and radially outward from the vicinity of a center hole which is the center of rotation of the information recording disk. A pair of front and back opening windows that expose a portion that extends to reach the vicinity of the outer peripheral edge is provided, and a shutter that can open and close the pair of front and back opening windows is movably held in the shell housing, and the shutter is the shell housing. A shutter member having a length that reciprocates from one side surface portion of the body to the other side surface portion facing the side surface portion, and an intermediate bent portion is formed by bending an intermediate portion in the longitudinal direction of the shutter member into a U-shape. A pair of front and back opening / closing portions that are continuous with both sides of the intermediate bent portion and capable of opening / closing the pair of front / back opening windows are provided.Furthermore, the opening-side ends of the pair of front / back opening / closing portions are inwardly U-shaped. By providing a pair of end bent portions by bending, the middle bent portion of the shutter is engaged with one side surface portion of the shell casing, and the pair of end bent portion of the shutter is attached to the other side surface portion of the shell casing. A disk cartridge, wherein the shutter is attached so that the shutter is engaged with the shell casing. 3. The disk cartridge according to claim 1, wherein a shutter opening / closing groove extending in a moving direction of the shutter is provided on one side surface portion of the shell housing, and an opening opening in the shutter opening / closing groove. And the lock arm is rotatably supported with the locking portion facing the opening, and the shutter is inserted into the shutter opening / closing groove and detachably locked to the locking portion. A disk cartridge, wherein a lock claw is provided, and the shutter is locked by locking the lock claw with the lock arm when the opening window is closed by the shutter. 4. The disk cartridge according to claim 1, wherein stepped portions extending in a moving direction of the shutter are provided on outer surfaces of left and right side surface portions of the surface shell without the opening window of the shell casing. A disk cartridge, wherein the floating stoppers of the pair of bent portions of the shutter are movably engaged with the shutter. 5. The disk cartridge according to claim 4, wherein the stepped portion is provided on each of inner surfaces of left and right side surface portions of the shell casing. 6. The disk cartridge according to claim 2, wherein a step portion extending in a moving direction of the shutter is provided on an inner surface of one side surface portion of the shell casing, and the end bent portion of the shutter on the surface shell side. A disk cartridge, characterized in that a floating piece at the tip and a floating piece at the tip of the end bent portion on the back shell side are respectively engaged with the step portion. 7. The disc cartridge according to claim 2, wherein a pair of front and back step portions extending in a moving direction of the shutter are provided on both front and back outer surfaces of one side surface portion of the shell housing, and the front shell side of the shutter is provided. Of the end bent portion of the shutter is engaged with the step portion of the back shell, and the end of the end bent portion of the shutter on the back shell side is attached to the step portion of the surface shell. A disc cartridge characterized by the combination. 8. The disc cartridge according to claim 1, wherein the opening window has a length that extends from one side surface portion of the shell casing to the other side surface portion through a central hole of the information recording disk. A disc cartridge having a continuous opening.