JPH0887856A - Disc cartridge - Google Patents

Abstract

PURPOSE: To obtain a disc cartridge in which a plurality of optical pickup insertion holes and a center hole can be opened and closed easily and positively while protecting a pair of shutters against flexure or deformation. CONSTITUTION: An upper half 20 and a lower half 10 constitute a flat housing cartridge body 2 for housing a magneto-optical disc 30 rotatably. The lower half 10 is provided with a center hole 11 and four optical pickup insertion holes 12. The lower half 10 is also provided with a pair of stoppers 14, 14 for stopping a pair of shutters 40, 40 at the notched parts 41b in the front fringe parts 41a thereof disposed closely each other. The lower half 10 is also provided with grooves 16, horizontal guiding parts 15a, etc., for guiding the front fringe part 42a, 42a of the pair of shutters 40, 40 disposed closely each other. The guide grooves 16 and the guiding part 15a protect the shutter against flexure or deformation at the time of closure thus enhancing the dust-proof performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust-proof disc for rotatably accommodating a disc such as a magneto-optical disc in a cartridge body and opening and closing a plurality of insertion holes for inserting an optical pickup formed on one surface of the cartridge body. And a disk cartridge provided with a pair of slide type shutters.

[0002]

2. Description of the Related Art For example, there is known a disk cartridge in which a rewritable magneto-optical disk having a diameter of 130 mm (5.25 inches) or the like is rotatably housed in a flat casing type cartridge body. In this disc cartridge, an insertion hole for inserting an optical pickup is provided on one side of the cartridge body, and an insertion hole for an external magnetic field for recording and erasing is provided on the other side of the cartridge body at a position facing the insertion hole for inserting the optical pickup. Each is formed. The insertion holes formed on both sides of the cartridge body are opened and closed by a single U-shaped slide type shutter.

[0003]

However, since the conventional disk cartridge described above uses a single U-shaped slide type shutter, a plurality of insertion holes for inserting an optical pickup are required in the cartridge body. In particular, when recording is performed at a constant rotation speed in a large-diameter magneto-optical disk, the pits on the inner circumference side and the pits on the outer circumference side are different from each other, so that When a plurality of large insertion holes for recording and erasing and for recording and erasing the outer peripheral portion are required, it is difficult to open and close each of these insertion holes with a single shutter, and
There is a defect that dust and dirt easily enter due to the deflection and deformation of the enlarged shutter itself.

Therefore, according to the present invention, a plurality of insertion holes or the like for inserting an optical pickup formed on one surface by a pair of shutters can be opened and closed easily and surely, and bending and deformation of each shutter can be surely prevented. The present invention provides a disc cartridge capable of improving dustproofness.

[0005]

A disk is rotatably accommodated in a flat casing type cartridge main body, and a plurality of insertion holes for inserting an optical pickup are formed on one surface of the cartridge main body, and at the center thereof. A center hole for inserting a turntable is formed, and the insertion hole and the center hole are freely opened and closed by a pair of shutters that slide along one surface of the cartridge body. When the pair of shutters are closed, the shutters are brought close to each other. A stopper is formed on a portion of one surface of the cartridge body that abuts both edges of the cartridge body, and a guide groove and a guiding portion into which both the adjacent edges of the pair of shutters enter are formed.

[0006]

When the pair of shutters closes the plurality of insertion holes and the center hole, the two adjacent edges of the pair of shutters hit the stopper, and the two adjacent edges are aligned with each other with a minimum gap. Further, at the time of this closing, both edge portions of the pair of shutters which are close to each other enter into the guide groove and the guiding portion, so that the pair of shutters are surely prevented from being bent or deformed. As a result, the dustproof property with respect to the plurality of insertion holes and the center hole when the pair of shutters are closed is further enhanced.

[0007]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 6 and 15 to 18,
Reference numeral 1 is a disk cartridge. The cartridge main body 2 of the disk cartridge 1 is a flat casing type in which a lower half 10 made of a synthetic resin and having a square shape and an upper half 20 made of a synthetic resin and having a square shape are butted against each other and fastened and fixed by a plurality of screws 3. It has become. A disk-shaped magneto-optical disk 30 having a diameter of 200 mm (8 inches) capable of recording and erasing on one side is rotatably accommodated in the flat casing type cartridge body 2. A circular center hole 11 for inserting a turntable of a recording / reproducing apparatus (not shown) is formed in the center of the lower half 10 as one surface of the cartridge body 2 and the center hole 11 is formed.
The rectangular insertion holes 12 for inserting the optical pickup of the recording / reproducing apparatus are formed with two pairs of them so as to face each other in a radial cross shape. The center hole 11 and the insertion holes 12 are the lower half 1 of the cartridge body 2.
A pair of metal plate shutters 4 that slide along 0
It is designed to be opened and closed by 0,40.

As shown in FIGS. 4 and 9 to 12, the outer surface of the lower half 10 is a substantially H-shaped convex portion 10a extending from both sides of the lower half 10 to the center hole 11, and the shutter 40 is provided at the central portion thereof. Each of the shutters 4 becomes a guide portion (convex portion) 10b for guiding and is slightly lower than the convex portion 10a.
It is integrally formed so as to extend in the sliding direction of 0. Further, between the convex portions 10a on both sides of the outer surface of the lower half 10 and the guide portion 10b, there are four concave portions 10c which are lower than the guide portion 10b. And
As shown in FIGS. 4 and 10, the center of the substantially H-shaped convex portion 10a of the lower half 10 is a pair of concave portions 10a 'and 10a' which are depressed toward the guide portion 10b in a substantially triangular shape.
An auxiliary plate (separate member) 13, which is made of a synthetic resin and is substantially wider than the substantially triangular shape of the recess 10a ', is fixed to each of the recesses 10a' through a predetermined means such as welding or bonding with an adhesive. I am doing it.

Further, each of the concave portions 1 of the lower half 10 having a substantially triangular shape
On both sides of the center hole 11 at the boundary between the apex of 0a 'and the guide portion 10b, both front edge portions (both adjacent edge portions) 41a of the shutters 40, which will be described later, close to each other when the shutters 40 are closed. A pair of stoppers 14, 14 on which the notches 41b, 41b on both sides of the stopper abut, are integrally formed in the shape of a rectangular protrusion. Further, the shutters 4 are provided at the opposite L-shaped boundaries of the four recesses 10c of the lower half 10 from the respective end corners of the pair of substantially triangular recesses 10a ', 10a' of the lower half 10.
Each pair of guide groove holes 1 into which both ends 42 and 43 of 0 enter
5 and 15 are formed respectively. Each guide slot 1
5 from each horizontal guiding portion (horizontal flange portion projecting above the guide groove hole 15) 15a to each stopper 14
A U-shaped guide groove 16 into which both of the front edge portions (both adjacent edge portions) 42a, 42a of the shutter 40, which are close to each other, is formed. These U-shaped guide grooves 16
Is composed of a gap composed of the auxiliary plate 13, the recess 10a 'and the recess 10c. In addition, an elliptical shape is provided at a position near one horizontal guiding portion 15a of one vertical guiding portion (vertical collar portion projecting above the guide groove 15) 15b facing each pair of guide groove holes 15, 15. The hole 15c and the semicircular cutout 15d are formed.
Further, as shown in FIGS. 10 and 14, each of the substantially guiding auxiliary plates 13 forming the horizontal guiding portions 15a and the vertical guiding portions 15b of the guide groove holes 15 and the U-shaped guide groove 16 is formed. Tapered surfaces 15e and 16e for guiding the edge of each shutter 40 are formed on both inclined edges.

Further, as shown in FIGS. 4 and 10, a pair of positioning holes 4 and 4 for positioning the cartridge body 2 in the recording / reproducing apparatus are provided at both front corners of the outer surface of the lower half 10.
And a pair of height positioning grooves 5 and 5 are formed on both side surfaces of the lower half 10. The cartridge body 2 is positioned in the X, Y, and Z directions in the recording / reproducing apparatus (for example, a cartridge holder) by the positioning holes 4 and the height positioning grooves 5. Further, a grip portion 10d is provided on the rear side of the outer surface of the lower half 10.
Is formed in a wave shape, and a rectangular protector hole 10e is formed on one end side thereof. Furthermore, a pair of pull-out grooves 6 and 6 are provided on the rear side of both side surfaces of the lower half 10.
Has been formed.

Further, as shown in FIG. 5, an annular rib 17 for rotatably accommodating the magneto-optical disk 30 is integrally formed on the inner surface of the lower half 10 and a pair of ribs 17 are provided on both sides thereof. The inner ribs 18, 18 and the pair of outer ribs 19, 19 are integrally formed. Furthermore, FIG.
As shown in FIG. 10, a predetermined number of round screw insertion holes 10f for inserting the screws 3 are formed in the lower half 10.

As shown in FIG. 1, the lower half 10 of the upper half 20 constituting the other side of the cartridge body 2
Two sets of concave external magnetic field grooves 22 for recording and erasing are formed at a position facing each of the insertion holes 12 so as to face each other in a radial cross shape. As shown in FIG. 4, each of the external magnetic field grooves 22 has a concave shape that protrudes inward so as to be close to the magneto-optical disk 30, and the thickness of the bottom of the concave external magnetic field groove 22 is upward. It is formed so as to be thinner than the other portions of the half 20 (for example, the external magnetic field groove 2 for the thickness of the upper half 20 of 2.5 mm).
2 has a bottom thickness of 1.0 mm).

As shown in FIG. 1, a pair of chucking roller receiving grooves 7 for chucking the cartridge body 2 into the recording / reproducing apparatus are provided at both front corners of the outer surface of the upper half 20.
7 are formed respectively, and the cartridge body 2
A pair of erroneous insertion preventing grooves 8 and 8 for preventing erroneous vertical insertion into the recording / reproducing apparatus are formed. That is,
When the cartridge body 2 is inserted into the recording / reproducing apparatus in a vertically normal state, the pair of protrusions in the recording / reproducing apparatus cause the pair of erroneous insertion preventing grooves 8 at the front both corners of the outer surface of the upper half 20 to
8 and the cartridge body 2 is inserted into the recording / reproducing apparatus. However, when the cartridge body 2 is inserted upside down, the front end surface of the cartridge body 2 hits the protrusion and It cannot be inserted any more.

Further, as shown in FIG. 1, the magnetic field modulation type magnetic head (made of a reversible magnet or the like) (not shown) for generating an external magnetic field is positioned in the X and Y directions on the outer surface of the upper half 20. A pair of external magnetic field positioning holes 9 and 9 are formed, and the four magnetic heads positioned by the pair of external magnetic field positioning holes 9 and 9 are radially arranged on the upper half 20. Groove 22
It is designed to be placed in the vicinity of.

Further, as shown in FIG.
An arrow 23 indicating the insertion direction of the cartridge main body 2 into the recording / reproducing apparatus is integrally formed in a concave shape on the front side of the outer surface of the upper half 20, and a pair of height positioning grooves 5, 5 are formed on both side surfaces of the upper half 20. 5 are formed respectively. A grip 20d is formed in a wave shape on the rear side of the outer surface of the upper half 20, and a rectangular protector hole 20e for operating the recording protector 24 is formed beside it. Further, a rectangular concave label attachment area 25 is formed above the grip portion 20d on the outer surface of the upper half 20.
Further, a pair of lead-out grooves 6 and 6 are formed on the rear sides of both side surfaces of the upper half 20, respectively. The recording protector 24 is a switch lever for recording / non-recording on the magneto-optical disk 30. By switching the recording protector 24 to the left / right, the recording / non-recording can be selected in conjunction with a sensor provided in the recording / reproducing apparatus.

As shown in FIG. 4, the inner surface of the upper half 20 has a pair of slip-off preventing walls 26, which are opposed to the linear guide grooves 15, 15 of the lower half 10.
26 is integrally formed. Also, the upper half 20
An annular rib 27 for rotatably housing the magneto-optical disk 30 is integrally formed on the inner surface of the
A pair of inner ribs 28, 28 and a pair of outer ribs 29, 29 are integrally formed on both sides of the rib. Furthermore, each screw insertion hole 10 of the lower half 10 on the inner surface of the upper half 20
Cylindrical boss 20f for screwing at a position facing f
Are formed integrally with each other.

As shown in FIG. 5, a pair of shutters 4
0 and 40 are formed in a vertically symmetrical shape about a straight line (diameter) at the center of the center hole 11 so as to divide and open each half of the center hole 11 of the lower half 10. is there. That is, each of these shutters 40
As shown in FIGS. 4 and 10, a step portion 41 guided by the guide portion 10b on the outer surface of the lower half 10 and sliding, and a pair of step portions facing the concave portions 10c, 10c on both sides of the outer surface of the lower half 10. 42, 42 and a pair of bent portions 4 that enter the pair of guide groove holes 15, 15 formed in the lower half 10.
3 and 44 are bent and formed by press molding or the like.

A pair of rectangular cutouts 41b and 41 are formed on both sides of the front edge 41a of the shutter 41, which is close to the step 41 of the shutter 40.
b are formed respectively. By applying the end surfaces of the pair of notches 41b, 41b of the step portion 41 of each shutter 40 to the end surfaces of the pair of stoppers 14, 14 of the lower half 10, as shown in FIG. A gap e between the front edge portions 41a of the 41 and the 41a is determined. That is, as shown in FIG. 12, when the width dimension of each stopper 14 is f and the width dimension of the cutout portion 41b of each shutter 40 is g, the gap e is e = f-2.
The condition e = f-2g> 0 in which the front edge portions 41a, 41a of the step portion 41 of each shutter 40 do not collide with each other.
And the design gap including the intersection can be made as small as possible.

As shown in FIGS. 4 and 10, the front edge portions 42a of the pair of step portions 42, 42 of each shutter 40 are curved in a V shape, and the front edge portions 42a of FIG. Up to the portion indicated by the one-dot chain line, it is adapted to enter the horizontal guiding portion 15a of each guide groove hole 15 and the U-shaped guide groove 16. More specifically, as shown in FIG. 13, the front edge portion 4 of each step portion 42 of each shutter 40.
Horizontal guiding portion 1 of end face 2a and each guide groove hole 15
The edges 5a and the edge 13a of the auxiliary plate 13 forming the guide groove 16 are provided with angles θ ₁ and θ _{2 so} that there is no deflection in the direction in which each shutter 40 is closed from h ₁ to arrow h. The front edge portion 4 of each step portion 42 of each shutter 40 in order
2a enters the horizontal guiding portion 15a of each guide groove hole 15 and the U-shaped guide groove 16 so that the front edge portion 42a of each step portion 42 of each shutter 40 and each guide groove hole 15 are formed.
The edge of the horizontal guiding portion 15a and the edge 13a of the auxiliary plate 13 forming the guide groove 16 are prevented from colliding with each other. In addition, as shown in FIGS. 10 and 13 to 14, a tapered surface is formed on the edge portions of the horizontal and vertical guiding portions 15 a and 15 b of each guide groove hole 15 and the edge portion 13 a of the auxiliary plate 13 that constitutes the guide groove 16. Since 15e and 16e are formed, each step portion 42 of each shutter 40 is formed.
It is designed to be guided without bending.

The bent portion 43 of each shutter 40 is on the drive side and extends to the side of racks 51 and 52 described later. As shown in FIGS. 4 and 10, a screw insertion hole 43a is formed in the bent portion 43. Further, the other bent portion 44 of each shutter 40 has a step portion 42.
Is bent at a right angle with respect to FIG.
As shown in (d), it is adapted to engage with each of the slip-off preventing walls 26 erected from the inner wall of the upper half 20.

As shown in FIGS. 5 and 7, a long drive side rack 51 is provided in the front-rear direction inside the rib 5a forming the height positioning groove 5 formed on one side surface of the cartridge body 2. Slidably provided in the cartridge main body 2 and the groove 18 between the inner ribs 18 and 28 on one side in the cartridge main body 2.
a, 28a and outer ribs 19, 29 between the grooves 19a, 29a
A short rack 52 on the driven side is provided between and in such a manner as to be slidable in the front-rear direction. This pair of racks 51, 52
A pinion 53 is interposed between and. The pinion 53 is rotatably supported by a support shaft portion 20g protruding from the inner surface of the upper half 20, and the pair of racks 51 and 52 are respectively moved in opposite directions (approaching and separating directions) by the rotation of the pinion 53. It is designed to slide. A pair of screw screw holes 51b, 51b are formed in the rear portion 51a of the drive side rack 51.
1a includes a bent portion 43 on the drive side of one shutter 40.
Are fastened and fixed by screws 45. Further, the front side 52a of the rack 52 on the driven side has a pair of screw screw holes 52.
b and 52b are formed, and the bending portion 43 on the drive side of the other shutter 40 is fastened and fixed to each screw screw hole 52b by each screw 45. As shown in FIG. 8, the rear portion 51a of the drive side rack 51 is also provided with the groove 18a between the inner ribs 18 and 28 on one side in the cartridge body 2.
28a and the grooves 19a, 29a between the outer ribs 19, 29 are slidably provided.

Further, as shown in FIGS. 4 and 19, a pin portion 51c is integrally formed on the front portion of the rack 51 on the drive side and a cutout portion 51d is formed. The base portion 54a side of the release lever 54 is swingably supported by the pin portion 51c. The tip 5 of this release lever 54
4b can be housed in the notch 51d of the drive side rack 51. A hook-shaped claw 55b at the tip of the lock lever 55 is locked in the cutout 51d. The base 55a of the lock lever 55 is the upper half 20.
It is fitted in the concave portion 20h on the inner surface of the above, and the tip of the hook-shaped claw portion 55b side is elastically deformable in the direction away from the cutout portion 51d. That is, as shown in FIGS. 15 and 19, the release lever 54 is pushed and rotated by the contact end surface 100a of the shutter opener 100 in the recording / reproducing apparatus, and the tip end portion 54b of the release lever 54 is attached to the tip end portion of the lock lever 55. By pressing the hook-shaped claw portion 55b of
The lock lever 55 is elastically deformed so that the claw portion 55b has the cutout portion 5.
It is designed to separate from 1d.

As shown in FIG. 5, the base portion 54a of the release lever 54 is provided with a notch portion 5b of the rib 5a which constitutes the height positioning groove 5 on one side surface of the cartridge body 2.
More exposed to the outside. Further, the rack 51 on the drive side is always pulled toward the lock lever 55 by the tension coil spring 56. One end of the tension coil spring 56 is locked to a pin portion protruding to the inner surface of the lower half 10, and the other end is locked to the rear portion 51a side of the drive side rack 51. The pair of racks 51 and 52, the pinion 53, the release lever 54, the lock lever 55, and the tension coil spring 56 constitute a reversing mechanism 50 that opens and closes the pair of shutters 40 and 40.

Further, as shown in FIG. 5, a dummy slider 61 is slidable between the rib 5a forming the height positioning groove 5 formed on the other side surface of the cartridge body 2 and the other outer rib 19 and the like. It is provided in. The head portion 61a of the dummy slider 61 is exposed to the outside of the notch portion 5b of the rib 5a forming the height positioning groove 5 on the other side surface of the cartridge body 2. Further, the dummy slider 61 is constantly pulled by the tension coil spring 66 so that the head portion 61a comes to the front side. One end of the tension coil spring 66 is locked to a pin portion protruding to the inner surface of the lower half 10, and the other end is locked to the rear side of the dummy slider 61. When the cartridge main body 2 is ejected from the recording / reproducing apparatus, the dummy slider 61 and the tension coil spring 66 generate a moment between the dummy slider 61 and the recording / reproducing apparatus by the returning force of only the tension coil spring 56 on the reversing mechanism 50 side. This is a mechanism for preventing so-called twisting of the cartridge body 2 in the apparatus.

These reversing mechanism 50 and dummy slider 6
After assembling the driving parts for opening and closing the pair of shutters 40, 40 such as 1 into the upper and lower halves 20, 10, and fastening both halves 10, 20 with the screw 3, the pair of shutters 40, 40 are From the side of each vertical guiding portion 15b in the direction indicated by the arrow of FIG.
Each of the vertical guiding portions 15b and the cutout portions 15d provided in the vertical guiding portions 15b and the screws 45 through the screws 45, and the bending portions 4 on the driving side of the pair of shutters 40, 40.
3 is fastened and fixed to the pair of racks 51 and 52, respectively.

As described above, when assembling the pair of shutters 40, 40 to the cartridge main body 2, since the upper half 20 is placed downward, the pair of shutters 40, 4 are assembled.
The fitting of the pair of racks 51 and 52, which are drive components of 0, in the left-right direction is defined by the groove precision of the ribs 28 and 29 of the upper half 20, as shown in FIGS.
The grooves of the ribs 18 and 19 widen the left and right shift amounts of the upper and lower halves 20 and 10 as a tolerance. That is, the rear 51a of the rack 51 and the rack 52 are fitted together in the left-right direction by the vertical wall surfaces of the grooves 28a and 29a of the ribs 28 and 29 of the upper half 20, respectively. 20,
The ribs 28 and 29 of FIG. 10 are regulated by the upper and lower wall surfaces of the grooves 28a and 29a and the ribs 18 and 19 of the ribs 18 and 19, respectively. Then, in order to suppress the friction between the sliding portion of the rear portion 51a of the rack 51 and the rack 52 as much as possible, and to reduce the contact area between the groove portion and each of the racks 51 and 52, the influence of the draft taper is further reduced. In order to increase the accuracy by
The depths of 9a, 28a and 29a are shallow.

According to the disc cartridge 1 of the above embodiment, as shown in FIGS. 15 and 19A, when the disc cartridge 1 is inserted into the recording / reproducing apparatus, the shutter opener 100 waiting in the recording / reproducing apparatus. The end surface of the base portion 54a of the release lever 54, which is exposed to the outside from the height positioning groove 5 on one side surface of the cartridge main body 2, is pushed by the contact end surface 100a of. This allows
The base portion 54a of the release lever 54 rotates in the direction of arrow i in FIG. 19A by a distance t, and the tip portion 54b of the release lever 54 presses the claw portion 55b on the tip portion side of the lock lever 55. By this pressing, the lock lever 55 is elastically deformed, the claw portion 55b of the lock lever 55 is separated from the cutout portion 51d of the rack 51, and the locked state of the rack 51 is released. At the same time, the rack 51 moves to the arrow j'in FIG.
Slide in the direction. Pinion 53 by this slide
15 rotates in the direction of arrow k in FIG. 15, and the rack 52 meshed with the pinion 53 slides in the direction of arrow j in FIG. By sliding the racks 51 and 52 in the opposite directions, the pair of shutters 40 and 40 fastened and fixed to the racks 51 and 52 by the screws 45 slide by the same shutter stroke amount S shown in FIG.
As a result, the pair of shutters 40, 40 are opened as shown in FIG. 17, and the center hole 1 for inserting the turntable 1 is opened.
Insertion holes 12 and 12 for inserting one and four optical pickups
Opens. At this time, the bent portions 44 on the driven side of the pair of shutters 40, 40 are always guided by the vertical guiding portions 15b of the guide groove holes 15 formed in the lower half 10. Further, the bent portion 44 on the driven side of each shutter 40 is locked to the slip-off prevention wall 26 erected by the inner wall surface of the upper half 20, so that each shutter 4
The zero does not come out of the one guide slot 15 of the lower half 10 and come off.

17 and 18 show a state in which the pair of shutters 40, 40 of the disc cartridge 1 are fully opened in the recording / reproducing apparatus. In the fully open state of the shutter, the trailing edge of one of the shutters 40 protrudes forward from the front edge of the cartridge body 2 by the distance L shown in FIG. 17, but since it is inside the recording / reproducing apparatus in normal use, one shutter 40 There is no danger during handling due to the trailing edge. Since the other shutter 40 opens and closes within the area of the cartridge body 2,
It is safe because it does not touch the trailing edge of the other shutter 40 when it is inserted into the recording / reproducing apparatus or when ejected.

Then, as shown in FIG. 17, a center hole 11 for inserting a turntable and an insertion hole 12 for inserting four optical pickups are formed in the lower half 10 of the cartridge body 2 to form a pair of shutters 40, 40. After being opened by the magneto-optical disc 3 in the cartridge body 2.
0 is mounted on a turntable rotated by a spindle motor in the recording / reproducing apparatus via a hub 31 and rotated, and is inserted into a pair of insertion holes 12, 12 which are opposed to each other on one diagonal line of the lower half 10. Information is recorded on or erased from the inner circumference side of the magneto-optical disk 30 by the optical pickup and the pair of magnetic heads adjacent to the pair of external magnetic field grooves 22 and 22 facing each other on one diagonal of the upper half 20. To be done. Further, a pair of optical pickups inserted in the pair of insertion holes 12, 12 facing each other on the other diagonal of the lower half 10 and a pair of external magnetic field grooves 22, 22 facing on the other diagonal of the upper half 20. Information is recorded or erased on the outer peripheral side of the magneto-optical disk 30 by a pair of magnetic heads close to each other. The information recorded on the inner and outer peripheries of the magneto-optical disk 30 is reproduced by each corresponding optical pickup or the like.

In the case of a disk cartridge using a magneto-optical disk, usually, an insertion hole for inserting a magnetic head (magnet) for generating an external magnetic field for recording and erasing from the upper surface (upper half) side of the cartridge body. However, in the present embodiment, as a result of considering the magnetic field strength of the magnetic head, it is not necessary to provide an external magnetic field insertion hole in the upper half 20 that constitutes the upper surface side of the cartridge body 2. By forming the radial external magnetic field groove 22 in the upper half 20 and dropping the magnetic head in that portion, the external magnetic insertion hole is not required, and the opening / closing shutter is not required on the upper half 20 side.

Next, when the disk cartridge 1 in the recording / reproducing apparatus is ejected from the shutter fully opened state shown in FIGS. 17 and 18, a tension coil spring is provided on the notch 5b side of the height positioning groove 5 on one side surface of the cartridge body 2. 5
The front portion of the drive-side rack 51 (the end surface of the base portion 54a of the release lever 54) that is pressed against the urging force of 6 is the contact end surface 1 of the shutter opener 100 in the recording / reproducing apparatus.
Away from 00a. As a result, the base portion 54a of the release lever 54 rotates in the direction opposite to the arrow i direction shown in FIG. 15, and the tip end portion 54b of the release lever 54 separates from the tip end side claw portion 55b of the lock lever 55. Then, due to elastic deformation of the lock lever 55, the claw portion 55b of the lock lever 55 engages with the notch portion 51d of the rack 51 to lock the rack 51 in the original position. Before this locking, the rack 51 on the drive side is indicated by the arrow j'shown in FIG.
It slides in the direction opposite to the direction, and by this slide, the rack 52 on the driven side meshed with the pinion 53 through the pinion 53 slides in the direction opposite to the arrow j direction shown in FIG. By sliding the racks 51 and 52 in the opposite directions, the screws 45 are attached to the racks 51 and 52.
Both of the pair of shutters 40, 40 fastened and fixed by means of the same slide by the same shutter stroke amount S shown in FIG. As a result, the pair of shutters 40, 40 are closed as shown in FIGS. 5 and 15, and the center hole 11 for inserting the turntable of the lower half 10 and the insertion holes 12, 12 for inserting the four optical pickups form a pair. Shutter 4
Closed by 0,40.

When the pair of shutters 40, 40 is closed, since each shutter 40 is on the lower surface side of the cartridge body 2, the weight of each shutter 40 and each shutter 40 are reduced.
Pair of guide slots 1 of the bent portions 43, 44 on both sides of the
There is a risk that the shutters 40 will bend downward and hang down due to rattling or the like when sliding against 5, and 15. However, as shown in FIG. 13, the edge surface of the front edge portion 42a of the step portion 42 of each shutter 40, the edge portion of the horizontal guiding portion 15a of each guide groove hole 15 and the edge of the auxiliary plate 13 forming the guide groove 16 are formed. The parts 13a have angles θ ₁ and θ ₂ ,
Moreover, the edge portion of the horizontal guiding portion 15a of the guide groove hole 15 and the edge portion 13a of the auxiliary plate 13 forming the guide groove 16 are formed.
Since the taper surfaces 15e and 16e are formed on each of the shutters, the front edge portion of the step portion 42 of each shutter 40 in the order of arrow h from the point h ₁ shown in FIG. 42a does not enter the horizontal guiding portion 15a of each guide groove hole 15 into the U-shaped guide groove 16 in order, and the step portion 42 of each shutter 40 is not bent. This avoids collision between the front edge 42a of the stepped portion 42 of each shutter 40, the edge of the horizontal guiding portion 15a of each guide groove hole 15 and the edge 13a of the auxiliary plate 13 forming the guide groove 16. At the same time, the pair of notches 41b, 41b on both sides of the front edge 41a of the stepped portion 41 of each shutter 40 hit the pair of stoppers 14, 14 without hitting up. At this time, the front edge portions 42 of the pair of step portions 42, 42 of the pair of shutters 40, 40
Since a enters the edge of the horizontal guiding portion 15a of each guide groove hole 15 and the guide groove 16, the deflection of the pair of shutters 40, 40 at the time of closing can be reliably prevented and deformation after closing. Can be reliably prevented. Further, when the pair of shutters 40, 40 are closed, the front edge portions 41a, 41a of the step portions 41 of the shutters 40 are in contact with each other with a minimum gap therebetween, so that the center hole 11 for inserting the turntable is formed. The dustproof property with respect to the insertion hole 12 for inserting each optical pickup is very good.

In this way, the reversing mechanism 5 composed of a pair of racks 51, 52 and a small number of drive parts such as the pinion 53.
By 0, a simple counter shutter opening / closing mechanism can be realized,
By sliding the pair of shutters 40, 40 easily and surely, the center hole 11 for inserting the turntable and the inserting hole 12 for inserting each optical pickup can be opened surely and smoothly. Since the pair of shutters 40, 40 can be opened and closed by the reversing mechanism 50 including a small number of drive parts, the mechanism of the entire disc cartridge 1 can be greatly simplified.

A center hole 11 for inserting a turntable and two insertion holes 12 for inserting four optical pickups are provided.
The shutters 40, 40 can be opened and closed reliably, and the cartridge area can be reduced. Further, four grooves 22 for the external magnetic field are provided in the upper half 20 which constitutes the upper surface of the cartridge body 2 so that they can be brought close to the medium recording surface of the magneto-optical disk 30 without opening the insertion hole for the external magnetic field. It also increases the strength of the main body 2.

Further, a pair of guide groove holes 15 and 15 for guiding opening and closing of the pair of shutters 40 and 40 and guiding portions 15a and 15b are integrally formed on the lower half 10 constituting the lower surface of the cartridge body 2. So
After assembling the cartridge body 2 while reducing the number of parts, each shutter 40 is inserted through the hole portion 15c and the cutout portion 15d formed on the vertical guiding portion 15b side.
Can be easily attached to each rack 51, 52. Further, the shutters 40 are moved horizontally to the guide groove holes 15 by the edge portions of the horizontal and vertical guiding portions 15a and 15b of the lower half 10 and the taper surfaces 15e and 16e formed on the guide groove 16, respectively. Since it is possible to reliably guide the edges of the guiding portion 15a and the guide groove 16, it is possible to reliably prevent the shutters 40 from being bent or deformed and to easily center the shutters 40 facing each other. It can be carried out. When the pair of shutters 40, 40 is opened and closed, the inner surface of the stepped portion 41 of each shutter 40 is slidably guided by the guide portion 10b of the lower half 10 and the pair of stepped portions 42 of each shutter 40. Since outer surfaces of both ends of the shutters 42, 42 are slidably guided by the horizontal and vertical guiding portions 15a, 15b, the shutters 40 smoothly open and close the center hole 11 and the four insertion holes 12 for inserting the optical pickups.

Further, since the pair of shutters 40, 40 are divided from the center of the turntable insertion center hole 11 to open and close the center hole 11 and the four optical pickup insertion holes 12, respectively. The opening / closing stroke amount S of the pair of shutters 40, 40 can be made the same, and the pair of stoppers 1 of the lower half 10
Since the pair of shutters 40, 40 are directly stopped on the No. 4, 14, the pair of shutters 40, 4 which are the dividing parts.
The gap between the front edge portions 41a, 41a of the zero step portion 41 can be made as small as possible, and the dustproof property can be further improved.

20 to 22 show a disk cartridge 1'of another embodiment. In the above embodiment, the center hole 11 for inserting the turntable and the insertion hole 12 for inserting the four optical pickups are opened / closed by the pair of shutters 40, 40 having the symmetrical upper and lower shapes. In the cartridge 1 ', the center hole 11 for inserting the turntable and the insertion hole 12 for inserting the four optical pickups are opened and closed by a pair of shutters 40A, 40B which are not symmetrical with each other. That is, the disk cartridge 1'includes one shutter 40A
Of the shutter 4 on the other side of the shutter 4
The front edge of the shutters 40A and 40B is abutted against the stopper 14 'which is formed by projecting in an arc shape on the outer surface of the lower half 10' by curving the front edge of 0B. As a result, one shutter 40A
The center hole 11 for inserting the turntable and the insertion holes 12, 12 for inserting the two front optical pickups are securely closed without a gap, and the shutter 40b for the other side inserts the two insertion holes 12 for inserting the two rear optical pickups. , 12 is surely closed without a gap. As shown in FIG. 22, the holes 11 of the pair of shutters 40A and 40B,
When the shutter 12 is opened, one shutter 40A has the same operation and effect as the above-mentioned embodiment except that the amount L protruding from the front edge side of the cartridge body 2 is slightly larger than that of the above-mentioned embodiment.

According to each of the above-described embodiments, the disk cartridge in which the magneto-optical disk having a diameter of 200 mm is rotatably accommodated has been described, but the disk is not limited to the one having a diameter of 200 mm, and one side of a magnetic disk other than the magneto-optical disk is also described. Needless to say, the above-described embodiments can be applied to a disc cartridge using another disc for recording and erasing information.

[0040]

As described above, according to the present invention, a disk is rotatably housed in a flat casing type cartridge body, and a plurality of insertion holes for inserting an optical pickup are provided on one side of the cartridge body. As it forms
A center hole for inserting a turntable is formed in the center thereof, and the insertion hole and the center hole are made openable and closable by a pair of shutters that slide along one surface of the cartridge body. By forming a stopper on one surface of the cartridge body that abuts on both edges of the shutter close to each other, and by forming a guide groove and a guiding portion into which the two edges of the pair of shutters enter, the pair of shutters is formed. At the time of closing the plurality of insertion holes and the center hole, the adjacent edges of the pair of shutters can be brought into contact with the stopper to align the adjacent edges with a minimum gap, and , Properly plan both edges of the pair of shutters close to each other through the guide groove and the guiding portion to the stopper side. By, it is possible to reliably prevent bending or deformation of the pair of shutters. This can further improve the dustproof property with respect to the plurality of insertion holes and the center hole when the pair of shutters are closed.

[Brief description of drawings]

FIG. 1 is a plan view of a disk cartridge showing an embodiment of the present invention.

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

FIG. 3 is a rear view of the disc cartridge.

FIG. 4 is an exploded perspective view of the disc cartridge.

FIG. 5 is a bottom view of the disc cartridge.

6A is a view taken along the line AA in FIG. 5, FIG. 6B is a sectional view taken along the line BB in FIG. 5, and FIG. 6C is a sectional view taken along the line CC in FIG. (D) is a sectional view taken along the line D-D in FIG. 5, (e)
Is a cross-sectional view taken along the line EE in FIG.

FIG. 7 is an enlarged cross-sectional view of a portion F in FIG. 6 (c).

FIG. 8 is an enlarged cross-sectional view of a portion G in FIG. 6 (d).

FIG. 9 is a bottom view of the cartridge main body showing a state in which the upper half and the lower half of the cartridge main body of the disc cartridge are combined.

FIG. 10 is a perspective view showing a state where a pair of shutters are attached to the lower half side of the cartridge body.

FIG. 11 is a bottom view showing a state where a pair of shutters of the cartridge body is closed.

FIG. 12 is a bottom view showing a state where a pair of shutters of the cartridge body is opened.

FIG. 13 is an enlarged explanatory view of lower halves of stopper portions of the pair of shutters.

14 is a cross-sectional view taken along the line HH in FIG.

FIG. 15 is a bottom view showing a state in which the disc cartridge is inserted into the recording / reproducing apparatus.

FIG. 16 is a side view showing a state in which the disc cartridge is inserted into the recording / reproducing apparatus.

FIG. 17 is a bottom view showing a state where the disc cartridge is inserted into the recording / reproducing apparatus and a pair of shutters are opened.

FIG. 18 is a side view showing a state in which the disc cartridge is inserted into the recording / reproducing apparatus and a pair of shutters are opened.

FIG. 19 (a) is a partially enlarged bottom view showing a state in which the disc cartridge is inserted into the recording / reproducing apparatus, and FIG.
Is an enlarged side view of the disc cartridge, and (c) is an enlarged sectional view of the disc cartridge.

FIG. 20 is a plan view of a disk cartridge according to another embodiment.

FIG. 21 is a bottom view showing a state in which a pair of shutters of the disk cartridge of the other embodiment is closed.

FIG. 22 is a bottom view showing a state in which a pair of shutters of the disk cartridge of the other embodiment is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disk cartridge 2 ... Cartridge body 10 ... Lower half (one side) 10b ... Guide part (projection part) 11 ... Center hole 12 ... Insertion hole 13 ... Auxiliary plate (separate member) 14 ... Stoppers 15a, 15b ... Guiding part 15e , 16e ... Tapered surface 16 ... Guide groove 30 ... Magneto-optical disk (disk) 40, 40 ... A pair of shutters 41 ... Step portion 41a ... Adjacent front edge portions (adjacent both edge portions) 42a ... Adjacent front edge portion ( (Proximity both edges)

Claims (4)

[Claims] 1. A flat housing type cartridge body accommodates a disk rotatably therein, and a plurality of insertion holes for inserting an optical pickup are formed on one side of the cartridge body, and a turntable is inserted in the center thereof. Center holes are formed, and the insertion holes and the center holes are made openable and closable by a pair of shutters that slide along one surface of the cartridge body, and both edge portions of the shutters close to each other when the pair of shutters are closed. A disk cartridge, wherein a stopper is formed on one surface of the cartridge main body corresponding to the above, and a guide groove and a guiding portion into which both adjacent edges of the pair of shutters enter are formed. 2. The disk cartridge according to claim 1, wherein the guide groove and the guiding portion are provided with tapered surfaces for guiding the edge portions of the respective shutters. 3. The disk cartridge according to claim 1, wherein the guide groove is formed by fixing another member to one surface of the cartridge body, and the guiding portion is formed integrally with the cartridge body. A disk cartridge characterized by. 4. The disk cartridge according to claim 1, wherein a step portion projecting upward is formed by bending at the center of each shutter, and one surface of the cartridge body facing the step portion is slidable in the slide direction of each shutter. The extending convex portion is integrally formed so that the convex portion and the inner surface of the step portion of each shutter are slidable, and the upper surfaces of both ends of each shutter are slidable on the guiding portion. Disk cartridge to do.