JPH10199184A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge capable of automatic assembling with the simple structure and also capable of preventing the erroneous insertion to a disk drive. SOLUTION: Four corner parts of a case 12 which is formed in flat rectangular state, are formed in a circular-arcuate state having the radius of about 4±0.2mm. The widths W of the circular-arcuate parts of a pair of front end cover parts 12c at the front end side of the case are formed wilder that 3.6mm. A shield plate 22a of a shutter 22 for opening/closing the window part of the case is provided with chamfers 22c for partially housing the front end corner parts at the opening position of the shutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge containing an optical disk as a recording medium.
In particular, the present invention relates to a disk cartridge having a shutter that can be opened and closed in both directions.

[0002]

2. Description of the Related Art In recent years, a magneto-optical (MO) recording type of 90 m
m optical disks have become widespread. Further, as the same 90 mm rewritable optical disk, a phase change type (PC) type optical disk that can be used on both sides and has a larger capacity, and an optical disk drive including the same have been developed.

[0003] In order to take advantage of the characteristics of the PC type optical disk, the basic part including the vertical and horizontal dimensions is 90 units.
A dedicated cartridge is provided which is the same as an MO type disc of mm, but which mainly has its own thickness size and shutter opening / closing mechanism.

[0004] Usually, a disk cartridge has a flat rectangular case containing an optical disk, and has windows on both sides of the case to expose a part of the optical disk and a hub. The case is provided with a slidable shutter for opening and closing the window.

In recent years, as a disk cartridge of this type, for example, a shutter that can be opened and closed on both left and right sides of a window, as disclosed in JP-A-63-119081 and JP-A-63-94487, has been proposed. A so-called double-sided disk cartridge is provided.

[0006] This double-opening disk cartridge has a pair of shutter springs provided on both sides of a shutter, and the shutter is held at a closed position where the window is closed by these springs. Each shutter spring has one end fixed to the case and the other end fixed to the shutter. In addition, the shutter is provided at a predetermined distance from the shutter.
One opening is formed. Then, by sliding the shutter in either direction against the urging force of the shutter spring, one opening of the shutter faces the window of the case, and the window is opened.

Further, as another type of double-sided disk cartridge, a guide shaft provided over the entire length in the width direction of the case, a pair of sliders slidably mounted on the guide shaft, and these sliders are mutually connected. There is provided one provided with a connected tension spring and a projection provided on an inner wall of a case so as to regulate sliding of each slider.

According to this disk cartridge, when the shutter is opened to one side, one slider moves on the guide shaft together with the shutter, and the other slider is restricted from moving in one direction by the projection. As a result, the shutter moves to the open position under the urging force of the tension spring, and when the opening force applied to the shutter is released, the window of the case is closed by the urging force of the tension spring. Return to position.

[0009]

However, in the disk cartridge having a pair of shutter springs described above, it is difficult to accurately hold the shutter at the closing position due to a variation in the urging force of the shutter springs.
In addition, when the shutter is opened, both shutter springs expand and contract, so that the movement stroke of the shutter cannot be made large.

A disk cartridge having a guide shaft, a slider, and the like has a large number of parts and a high manufacturing cost, and has a complicated structure and is relatively difficult to assemble. Not suitable for automatic assembly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a disk cartridge having a simple structure and capable of securely holding a shutter at a closed position.

[0012]

According to a first aspect of the present invention, there is provided a disk cartridge for storing a disk-shaped recording medium and a window exposing a part of the recording medium. A case having a portion, a shutter that is movably attached to the case, a closing position that closes the window, and two opening positions that are located on both sides of the window and respectively open the window, A pair of shutter springs disposed on both sides of the shutter in the case and biasing the shutter toward the closed position and holding the shutter springs in the closed position. It is formed in a flat rectangular shape having two parallel main surfaces formed, a front end surface, and two side surfaces parallel to each other. A spring accommodating portion accommodating the spring, two openings which are open at the front end face of the case and communicate with the spring accommodating portions, respectively, and through which the shutter spring can be inserted; A bridge facing the window.

The shutter has a pair of substantially rectangular shielding plates respectively located on a main surface of the case and closing the window, and a pair of the shutters located opposite to a front end surface of the case. A connecting plate connecting the shielding plates to each other, the connecting plate being movably provided along an extending direction of the front end surface of the case, and four corners of the case each having a radius of about 4 ± 0.2 mm. It is characterized by being formed in an arc shape.

According to the disk cartridge having the above structure, at the time of assembly, after the shutter is mounted on the case, each shutter spring is inserted into the spring accommodating portion through the opening of the case, so that the pair of shutter springs is mounted at the predetermined position. can do. Each corner of the case has a radius of about 4
Since the disk cartridge is formed in an arc shape of ± 0.2 mm, it becomes impossible to insert the disk cartridge into an unsuitable driving device, and erroneous insertion can be prevented.

According to a seventh aspect of the present invention, there is provided a disk cartridge accommodating a disk-shaped recording medium, a case having a window partly exposing a part of the recording medium, and a closing part closing the window part. Position, two open positions located on both sides of the window, each opening the window,
A shutter movably attached to the case,
A pair of shutter springs disposed on both sides of the shutter in the case and biasing the shutter toward the closed position and holding the shutter springs in the closed position. The shutter is formed in a flat rectangular shape having two parallel main surfaces, a front end surface, a rear end surface, and two side surfaces parallel to each other, and formed on both sides of the window portion. A spring accommodating portion accommodating a spring, two openings which are open at the front end face of the case and are respectively communicated with the spring accommodating portion and through which the shutter spring can be inserted, and the window located between the openings; And a bridge part facing the part.

The main surface of the case has a detection hole formed at each corner on the rear end face side, and has a predetermined width extending along each of the side surfaces at an end on the rear end face side for detection. A detection area where a hole is not provided, wherein the shutter is located on a main surface of the case, and a pair of substantially rectangular shielding plates closing the window, and a front end surface of the case. And a connecting plate, which is opposed to the connecting plate and connects the pair of shielding plates to each other, and is provided so as to be movable along an extending direction of the front end surface of the case.

According to an eighth aspect of the present invention, there is provided a disk cartridge for accommodating a disk-shaped recording medium and having a window having a part of the recording medium exposed, and a closing member for closing the window. Position, two open positions located on both sides of the window, each opening the window,
A shutter movably attached to the case,
A pair of shutter springs disposed on both sides of the shutter in the case and biasing the shutter toward the closed position and holding the shutter springs in the closed position. The shutter is formed in a flat rectangular shape having two parallel main surfaces, a front end surface, a rear end surface, and two side surfaces parallel to each other, and formed on both sides of the window portion. A spring accommodating portion accommodating a spring, two openings which are open at the front end face of the case and are respectively communicated with the spring accommodating portion and through which the shutter spring can be inserted, and the window located between the openings; And a plurality of detection holes formed at corners of at least one main surface on the rear end surface side.

The interval between the plurality of detection holes is 5.5 mm.
Alternatively, the shutter is set to an integral multiple of 5.5 mm, and the shutter is located on a main surface of the case, and a pair of substantially rectangular shielding plates closing the window portion is opposed to a front end surface of the case. And a connecting plate that connects the pair of shielding plates to each other, and is provided movably along the extending direction of the front end surface of the case.

According to a ninth aspect of the present invention, there is provided a disk cartridge containing a disk-shaped recording medium having an information recording surface on one surface and a window having a part of the recording medium exposed. A shutter that is movably attached to the case, a closing position that closes the window, and two opening positions that are located on both sides of the window and that open the window, respectively. A pair of shutter springs disposed on both sides of the shutter, each biasing the shutter toward the closed position and holding the shutter at the closed position.

The case has an effective surface having the window and facing the information recording surface of the recording medium, an ineffective surface having the window and facing the other surface of the recording medium, and a front end surface. And a spring accommodating portion formed on both sides of the window and accommodating the shutter spring, respectively, and a flat rectangular shape having a rear end surface and two side surfaces parallel to each other. Two opening portions that are open to the front end face and are respectively communicated with the spring accommodating portions and through which the shutter spring can be inserted; a bridge portion located between the opening portions and facing the window portion; And a plurality of detection holes formed only.

The shutter is located on a main surface of the case and closes the window, and a pair of substantially rectangular shielding plates is provided. The shutter is located opposite to a front end surface of the case. And a connecting plate that connects the shielding plates to each other, and is provided movably along the extending direction of the front end surface of the case.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a disk cartridge according to an embodiment of the present invention will be described in detail with reference to the drawings. First, the overall configuration will be schematically described. As shown in FIGS. 1 to 3, a disk cartridge 10 according to the present embodiment accommodates an optical disk 14 having a recording / reproducing surface on both sides as an information recording medium. A flat rectangular case 12 is provided. The case 12 is formed by joining a pair of half cases 13.

The upper and lower surfaces of the case 12, that is, 2
One main surface has a window 1 for accessing the optical disc 14.
6 are formed and face each other. Each window 1
Reference numerals 6 extend from substantially the center of the case 12 toward the insertion direction A of the disk cartridge 10 to the vicinity of the front end surface 12a of the case 12.

Optical disk 14 stored in case 12
A hub 18 having a center hole 21 is attached to the center of the hub. Then, the hub 18 and the optical disc 1
4 are partially exposed through the window 16.

Each window 16 has a substantially semicircular central portion 16a facing the hub 18 of the optical disk 14, and a rectangular extending portion extending from the central portion and facing the recording / reproducing surface of the optical disk. And a projection 16b.
The central portion 16a is formed to have a slightly larger diameter than the hub 18. The width of the extension 16b is
It is formed slightly larger than the diameter of a. And
Step 16c at the boundary between the center 16a and the extension 16b
Are obliquely cut to prevent damage to the optical disk 14.

In the case 12, a double-sided integrated shutter 22 for opening and closing the window 16 is slidably provided. The shutter 22 has a U-shaped cross section, and is attached so as to sandwich both sides of the case 12 from the front end surface 12a of the case 12. The shutter 22 is connected to the
As shown in FIG. 3, a closed position for closing the window portion 16 and two open positions for opening the window portion 16 on both sides of the closed position as shown by a solid line and a two-dot chain line in FIG. A direction G parallel to the front end face 12a of the case 12
Can be slid along. As described later, the shutter 22 is constantly urged toward the closed position by two shutter springs 8 disposed on both sides of the window 16 in the case 12.

Next, the configuration of each part of the disk cartridge 10 will be described in detail. As shown in FIGS. 1 and 2, the pair of half cases 13 constituting the case 12 have the same shape and structure except for a part, and are joined with their insides facing each other with the front and back reversed. I have.
Each half case 13 has an access window 16. Also, the shutter 2 in the surface of the half case 13
The area where 2 slides is formed as a shallow rectangular recess 15, and a window 16 is also formed in this recess. Also,
The half case 13 extends from the center of the rear end of the recess 15 to the window 1.
6 has a protrusion 17 for retaining the protrusion, which is engaged with a free end of the shutter 22 to hold the shutter in the recess 15 as described later.

A bridge 21 extending across the window 16 is formed at the center of the front end of each half case 13 and faces the front end of the window. A pair of fitting holes 23 are formed on the inner surface of the bridge portion 21 of one half case 13,
The bridge portion 21 of the other half case 13 is provided with a pair of projections (not shown) that fit into the fitting holes 23. The pair of half cases 13 have substantially the same configuration except that one half has a fitting hole 23 and the other has a projection.

At both rear corners of each half case 13,
When a disc cartridge is loaded into an optical disc drive (not shown), a projection provided on the optical disc drive is inserted through the mounting hole 20 into which an operation piece for switching a write protection (not shown) is slidably fitted. A pair of reference positioning holes 24 for positioning the optical disk cartridge with respect to the optical disk drive and a detection hole 26 for detecting loading of the disk cartridge into the optical disk drive (not shown) are formed.

A detection area H having no holes, recesses or the like is formed on both rear corner surfaces of each half case 13. Each detection area H is approximately 0.5 mm from the side edge of the half case 13 with reference to the reference positioning holes 24 and the detection holes 26.
It is formed with a width of 3 mm or more. When the disk cartridge 10 is loaded into the optical disk drive, even if all of the reference positioning holes 24 and the detection holes 26 are in the penetrating state, the detection of the detection area H can detect the insertion of the disk cartridge. It becomes possible.

As can be clearly understood from FIGS. 2 and 4, the inner surface of the half case 13 has the outer edge of the half case,
A rib 13a having a predetermined height is formed over substantially the entire circumference except the front end, and constitutes both side walls and a rear wall of the case 12. Also, on the inner surface of the half case 13, the optical disc 1
4 annular ribs 13b for forming a space for storage
Is formed in the body. The diameter of the rib 13b is set to be larger than the diameter of the optical disk 14. The edge on the opening 16 side of the bridge portion 21 is formed in an arc shape continuous with the rib 13b.

On both sides of the front end of the window portion 16, ribs 13 are provided.
A pair of spring accommodating portions 30 for accommodating the shutter springs 8 are formed by the a, 13b and the bridge portion 21, respectively. Each spring accommodating portion 30 has an opening 32 opened on the front end surface 12 a of the case 12, and these openings 32 are located on both sides of the bridge portion 21.

A fixed spring receiver 34 protrudes from the inner surface of one side wall of the half case 13, and is located in the spring accommodating portion 30 near the opening 32. The fixed spring receiver 34 is formed in a hook shape, and has an inclined surface 34 a that is inclined rearward from the inner surface of the side wall of the half case 13 toward the spring accommodating portion 30.

Further, a projection 36 is provided in the other spring accommodating portion 30 near the bridge portion 21, and the upper surface of the projection, that is, the side facing each other when the pair of half cases 13 are joined. A guide surface 36 inclined toward the opening 32 and the inner surface of the half case 13
a is formed. As will be described later, the guide surface 36a moves the shutter spring 8 from the deformed position to the initial position, that is,
When returning to the position where the shutter 22 is in the closed position,
The arm of the shutter spring is guided to a predetermined position.

As shown in FIGS. 2, 4 and 5, a pair of left and right locking spring receivers 38 are formed at both longitudinal ends of the bridge portion 21, respectively. Each locking spring receiver 3
8 are formed by recesses opened toward the opposing spring accommodating portions 30, respectively.
The half case 13 has an inclined surface 38a inclined toward the rear of the half case 13. Further, as described later, the locking spring receiver 38 is provided on the corresponding fixed spring receiver 34 to prevent interference between the fixed end and the movable end of the shutter spring when the shutter 22 is moved to the open position. , Are slightly shifted in the front-rear direction of the half case 13, that is, in the insertion direction A.

The half case 13 is formed with a guide groove 40 extending along the front end face 12a, and is located near the front end face. The guide groove 40 is provided to guide the sliding of the shutter 22.
First portion 40a formed on the outer surface of bridge portion 21
And a pair of second portions 40b formed on the inner surface of the half case 13 and located in the respective spring accommodating portions 30.

The first portion 40a extends over the entire length of the bridge portion 21 in the longitudinal direction, and both ends thereof communicate with the corresponding spring accommodating portions 30, respectively. Each of the second portions 40b is formed so as to be linearly aligned with the first portion 40a, extends from the side wall of the half case 13 to the bridge portion 21, and communicates with the end of the first portion 40a. doing.

The bridge portion 21 is formed to have a thickness smaller than the thickness of the case 12, and the outer surface thereof is located at a lower level than the outer surfaces of other portions of the half case 12. A slit 42 extending to the guide groove 40 is formed at a boundary between the two ends of the bridge 21 and the spring housing 30. Then, the first of the guide grooves 40
The ends of the second portions 40a and 40b face upside down via the slit 42.

A moving groove 44 extending along the front end surface 12a of the half case 13 and opening to the front end surface is formed on the inner surface of the front end portion of the bridge portion 21. Also,
A guide groove 40 is formed on the outer surface of the bridge portion 21 from the front end thereof.
A pair of mounting guide grooves 46 extending to the vicinity of the first portion 40a are formed. Each mounting guide groove 46 is formed so as to be inclined from the guide groove 40a side toward the distal end side of the bridge portion 21.

The pair of half cases 13 configured as described above are abutted and joined to each other with the inner surfaces thereof facing each other. At the same time, one bridge 21
The projection formed on the other bridge portion is elastically fitted into the fitting hole 23 formed on the half case 13, and the joined state of the half cases 13 is maintained.

In a state where the half cases 13 are joined together, as shown in FIGS.
The spring accommodating portions 30 are formed on both sides of the body. Fixed spring receivers 34 are provided on the inner surfaces of the left and right side walls of the case 12.
Are provided, and project into the corresponding spring accommodating portions 30. In each spring accommodating portion 30, an inclined guide surface 36a for guiding the arm of the shutter spring is provided near the bridge portion 21.

The locking spring receivers 38 respectively formed on the two bridge portions 21 are aligned with each other at each end of the bridge portions, and face the corresponding spring receiving portions 30. The moving groove 44 formed in the bridge portion 21
Each end extends between two opposing locking spring receivers 38 and communicates with the spring housing 30. Furthermore,
The mounting guide grooves 46 formed in the bridge portion 21 are arranged to face the mounting guide grooves 46 formed in the other bridge portion, respectively.

As shown in FIGS. 1 to 4, four corner side surfaces of the case 12 composed of a pair of half cases 13 are formed in an arc shape. In particular, the radius R of the corner is 4
mm ± 0.2 or less. This is to prevent the disk cartridge 10 according to the present embodiment having a shape similar to a CD caddy from being erroneously inserted into the CD caddy drive.

The front end corners 12c of the case 12 are formed so as to protrude forward by a distance L from the front end surface 12a of the case 12. That is, of the front end surface 12a, the shutter 22
Is moved toward the rear wall of the case 12 by a distance L and communicates with the recess 15 on the case surface.
This distance L is set to be greater than a plate thickness d1 of a connecting plate 22b of the shutter 22, which will be described later. The width W of the corner portion 12c along the sliding direction G of the shutter 22 is set to 3.6 mm or more so as to secure a sufficient arc shape. In the present embodiment, the corner 12c is formed so as to protrude toward the recess 15 so that the predetermined width W can be secured.

As shown in FIGS. 1, 3 and 4 (c), a guide slot 19 extending in the insertion direction A of the disk cartridge 10 is formed at the front end of each side wall of the case 12. The guide slot 19 extends to the front end corner 12 c of the case 12 and opens on the front end side of the case 12. When the disk cartridge 10 is inserted into an optical disk drive (not shown), a guide pin 19 provided on the drive side enters the guide slot 19 from the front end side with the insertion operation, and the disk cartridge 1 is inserted.
Guides the insertion operation of 0. The front end of each guide slot 19 is provided with a case 1 so that the guide pin 19 can be easily inserted.
2 gradually widens toward the front end side.

As shown in FIGS. 1 to 3 and 8, the shutter 22 includes a pair of elongated rectangular shielding plates 22 a each having a size capable of closing the window 16 of the case 12. A connection plate 22b connecting these shield plates. The shielding plates 22a are opposed to each other in parallel at predetermined intervals, and
“b” extends perpendicular to the shield plate and connects one end of the shield plate. In addition, of the two side edges of each shielding plate 22a,
A rectangular notch 22c is formed at the end on the b side corresponding to the front end corner 12c of the case 10.

The shutter 22 includes a pair of left and right guide projections 52a and 52b and a pair of movable spring receivers 54. That is, a pair of guide projections 52a and 52b are provided on the inner surface of one end in the width direction of the connection plate 22b.
And one movable spring receiver 54 is provided.
a pair of guide projections 52 on the inner surface at the other end in the width direction of b.
a, 52b and the other movable spring receiver 54 are provided.

The guide projections 52a and 52b are formed in a plate shape, project from the inner surface of the connecting plate 22b in parallel with the shielding plate 22a, and face each other at a distance substantially equal to the thickness of the bridge portion 21 of the case 12. doing. The guide projection 52a has a projection 56a (first projection) projecting from the extension end thereof toward the guide projection 52b, and a projection 56b (second projection) projecting from the extension end toward the shield plate 22b. When,
These projections extend in a direction parallel to the connecting plate 22b, that is, in the sliding direction B of the shutter 22. Also,
Each of the protrusions 56a and 56b is formed to be slightly inclined, for example, about 0.1 to 0.2 mm from the tip of the guide protrusion 52a toward the connecting plate 22b and the opening 32 of the case 12. . Thus, the distal end of the guide projection 52a is formed to have a substantially anchor-shaped cross section as a whole.

Similarly, the guide projection 52b has a projection 56a (first projection) projecting from the extension end thereof toward the guide projection 52a, and a projection 5 projecting from the extension end toward the shielding plate 22b.
6b (second protrusion), and these protrusions extend in a direction parallel to the connecting plate 22b, that is, in the sliding direction G of the shutter 22. Each of the protrusions 56a and 56b is formed to be slightly inclined from the tip of the guide protrusion 52b toward the connecting plate 22b. Thus, the distal end of the guide projection 52b is formed to have a substantially anchor-shaped cross section as a whole.

The guide projection 52a extends from the widthwise edge of the connecting plate 22b toward the center of the connecting plate. Also,
The guide projection 52b extends toward the center of the connection plate from a position slightly separated from the widthwise edge of the connection plate 22b. That is, the width of the guide projection 52b along the sliding direction G of the shutter 22 is shorter than the width of the guide projection 52a, and as described later, when the shutter 22 is moved to the open position, the guide projection 52b interferes with the shutter spring. Not configured. Further, of the first and second protrusions 56a and 56b of the guide protrusion 52b, the end 5 on the side of the edge of the connecting plate 22b.
In order to more reliably prevent interference with the shutter spring when the shutter 22 is moved to the open position, 6c has an outer corner cut off and formed in an oblique or arc shape.

The guide projection 52a is formed such that the width of the shutter 22 in the sliding direction G is longer than the width of the guide projection 52b. As described later, the guide groove 40 is provided at both the closed position and the open position of the shutter. Maintain an engagement state with the first and second portions. Also, the guide projection 52
5A, the first protrusion 56a is formed to have a shorter length in the width direction than the second protrusion 56b, and the end on the edge side of the connecting plate 22b is omitted, and is separated from this edge. This is to prevent interference between the guide projection 52a and the shutter spring when the shutter 22 is moved to the open position.

The other set of guide projections 52a, 52
b is formed symmetrically with the one set of guide projections described above and is arranged upside down. In addition, each movable spring receiver 5
4 is also formed in a plate shape, and the shielding plate 2
2a, and the guide projection 52
a, 52b. Each movable spring receiver 54
The connecting plate 22b extends from the edge in the width direction toward the center of the connecting plate, and a concave portion 54a is formed at the edge. The recess 54a is provided with the locking spring receiver 3 of the case 12 described above.
8 are formed in almost the same size and shape.

As shown in FIGS. 2, 8 and 9, the connecting plate 22b of the shutter 22 has a rectangular box-shaped protruding portion 50 protruding outward at the center in the width direction. A pair of steps 51 is formed. These steps 5
Numerals 1 extend perpendicular to the sliding direction G of the shutter 22 and face each other at a predetermined interval. When the disk cartridge 10 is loaded in the optical disk drive, a shutter opening / closing pin 70 (see FIGS. 9C and 21) of a shutter opening / closing mechanism for sliding the shutter 22 is engaged with the one step portion 51.

During the opening / closing operation of the shutter 22, the height of the projecting portion 50, that is, the projecting length of the step portion 51 is adjusted so that the shutter opening / closing pin 70 maintains the engagement state with the step portion 51 without fail. The setting is made in consideration of the diameter of the pin 70. Since the corners of the protruding portion 50 are formed in an arc shape, the extension length h of the flat portion of the step portion 51 is also considered in consideration of the arc portion.
Is set to be 1.5 times or more the radius of the shutter opening / closing pin 70.

For example, the diameter of the shutter opening / closing pin 70 is 3 m.
In the case of m, the entire height of the protruding portion 50 is set to 3 mm, and the extension length h of the straight portion is set to about 2.5 mm. The shutter 22 having the above configuration is integrally formed of resin. The thickness d1 of the connection plate 22b is set to be approximately twice the thickness d2 of each shielding plate 22a. Further, in order to improve the strength of the protruding portion 50 and the connecting plate 22b, two ribs 58 extending in the longitudinal direction of the connecting plate 22b are integrally formed inside the protruding portion 50. Also, the guide projections 52a, 52
In order to improve the strength and positional accuracy of the movable spring receiver 54 and the movable spring receiver 54, a padding 59 is provided at the base end thereof.

Further, a recess 60 is formed on the inner surface of the projecting portion 50 of the connecting plate 22b. The recess 60 faces the gate position J when the shutter 22 is injection-molded, and acts to make the flow of resin uniform during injection molding. The guide projections 52a and 52b, the movable spring receiver 5
4. The ribs 58 and the like are formed symmetrically about the gate position J.

The shutter 22 configured as described above
As shown in FIG. 2, the free end of the shielding plate 22a is
Is attached to the case 12 by pushing in the direction of arrow E from the front end face 12a side of the. At this time, the guide protrusions 52a and 52b of the shutter 22 are pushed in a state where they are aligned with the mounting guide grooves 46 formed in the bridge portion 21. Thereby, the guide projections 52a and 52b of each pair move along the mounting guide groove 46 while sandwiching the bridge portion 21 from above and below.

By further pushing the shutter 22 in the direction of arrow E, the guide projections 52a and 52b are
And the connecting plate 22b is engaged with the first portion 40a of the case 1.
2 and adjacently opposes the front end face 12a. The pair of movable spring supports 54 projecting from the inner surface of the connecting plate 22b
1 is slidably inserted into a moving groove 44 formed in the distal end surface.

The shielding plate 22a moves on each upper surface of the case 12, and its free end is located between the bottom surface of the recess 15 formed on each surface of the case 12 and the protrusion 17 for retaining. Is inserted and retained. With the above operation, the shutter 2
2 is attached to the case 12.

As shown in FIGS. 1, 3, 10 and the like, when the shutter 22 is mounted on the case 12, each shielding plate 22a is parallel to the upper surface of the corresponding half case 13,
And the connecting plate 22b is located in the recess 15a.
Is opposed to the front end face 12a of the case 12 in parallel.

As shown in FIG. 10, when the shutter 22 is in the closed position, the two windows 16 of the case 12 are closed.
Are closed by the shutter shielding plates 22a, respectively. The width of each shielding plate 22 a is formed slightly larger than the width of the window 16, and both side edges of the shielding plate overlap the upper wall of the case 12.

As shown in FIGS. 10 and 11,
When the shutter 22 is closed, the recesses 54 a of the pair of movable spring receivers 54 are aligned with the locking spring receivers 38 provided at both ends of the bridge portion 21 of the case 12. Further, the movable spring receiver 54 and the locking spring receiver 38 aligned with each other are provided so as to be located in an overlap region 60 between the shutter 22 and the upper wall of the case 12.

As shown in FIGS. 10 and 12, when the shutter 22 is closed,
a and 52b sandwich the bridge portion 21 of the case 12 from both sides. Also, the protrusions 56a inside the guide protrusions 52a and 52b respectively correspond to the first portions 40 of the guide grooves 40.
a is slidably engaged with a. That is, the guide protrusion 5
2a and 52b guide the movement of the shutter 22 by sliding the inner protrusion 56a in the first portion 40a while moving on the bridge portion 21.

On the other hand, as shown in FIG.
Is moved from the closed position to one of the open positions, the two shielding plates 22a of the shutter separate from the windows 16 to open the windows. At this time, the movable spring receiver 54 of the shutter 22
Move out of the movement groove 44 of the bridge portion 21 and into the spring housing portion 30 on the open side.

The guide projections 52a of the shutter 22
52b, as shown in FIG. 14 and FIG.
a slides in the first portion 40a of the guide groove 40,
Each of the spring housing portions 30 on the open side passes through the slit 42.
Move in. At this time, the guide protrusions 52a, 5
The first projection 56a of 2b comes off the first portion 40a,
Instead, the outer second protrusion 56 b is
To the portion 40b. Here, each guide projection 52a
Is formed to be longer in the width direction than the guide protrusion 52b, so that the second protrusion 56b of the guide protrusion 52a is formed.
Has its end slidably engaged with the second portion 40b of the guide groove 40 even in the closed position of the shutter 22. Therefore, when the shutter 22 is slid from the closed position to the open position, the second protrusion 5 of the guide protrusion 56a on the open side is used.
6b can smoothly enter the second portion 40b of the guide groove 40.

Thereafter, the projection 56b of the guide projections 52a, 52b moves in the second portion 40b until the shutter 22 reaches the open position. That is, the guide projection 52
a, 52b, while moving in the spring accommodating portion 30, the outer projection 56b is provided on the first portion 4 provided in the spring accommodating portion.
The movement of the shutter 22 is guided by sliding within 0b.

The first and second portions 40a and 40b of each guide groove 40 formed in the case 12 have first and second anchor-shaped first and second portions 40a and 40b as can be clearly understood from FIGS. The shutter 22 is formed in a shape slightly inclined toward the connecting plate 22b side corresponding to the protrusions 56a and 56b. Therefore, even when the shutter 22 receives a biasing force in the direction of pulling out of the case 12 by a shutter spring described later, the first and second protrusions 56a and 56b are respectively connected to the first and second portions 40a and 40a of the guide groove 40. 4
0b is reliably maintained. Therefore, the shutter 20 is prevented from being accidentally dropped from the case 12.

As shown in FIGS. 2, 16 to 18,
Spring housing 3 formed on both sides of window 16 of case 12
As the pair of shutter springs 8 housed in a pair 0, those having the same structure are used in a point-symmetric manner. That is, each shutter spring 8 includes a coil portion 8a and two arms 9 extending from both ends of the coil portion in directions substantially opposite to each other.
a, 9b. The tip of one arm 9a is bent at a right angle to the coil portion 8a side to form a fixed end 11a. The tip of the other arm 9b is bent at a right angle toward the coil 8a to form a movable end 11b.

The shutter spring 8 having the above-described structure
2 with the front end face 1 of the case 12 held in the closed position.
The springs are mounted in the spring accommodating portions 30 from the opening portions 32 that are opened in 2a. That is, first, the shutter 22 is moved to the closing position, and the movable spring receiver 54 of the shutter 22 and the locking spring receiver 38 formed on the bridge portion 21 are aligned with each other. In this state, the pair of arms 9a and 9b of each shutter spring 8 are slightly elastically deformed in a direction approaching each other, and then inserted into the spring accommodating portion 30 through the opening 32 from the coil portion 8 side.

Subsequently, the fixed end 11a of the shutter spring is connected to the guide surface 34 of the fixed spring receiver 34 formed on the case 12.
a, and the movable end 11b is brought into contact with the guide surface 38a of the movable spring receiver 54 and the locking spring receiver 38 aligned with each other. When the pressing force applied to the arms 9a and 9b is released in this state, the arms 9a and 9b move in a direction away from each other by their own elasticity. At this time, the fixed end 11a and the movable end 11b of the shutter spring 8 move along the guide surfaces 34a and 38a, respectively, and the fixed end 11a
Engages with the fixed spring receiver 34, and the movable end 11b engages with the locking spring receiver 38 of the bridge portion 21 and the movable spring receiver 54 of the shutter 22.

By the above operation, the pair of shutter springs 8
Is completed. As shown in FIGS. 16 to 18,
When the shutter 22 is in the closed position, each movable spring receiver 54 of the shutter is aligned with the corresponding locking spring receiver 38 of the case 12, and the movable end 11b of each shutter spring 8 is Stop spring receiver 38
Is engaged. Thus, the shutter 22 is urged from both sides by the two shutter springs 8 and is held at the closed position.

In this case, the movable end 11 of each shutter spring 8
b engages with the locking spring receiver 38 of the case 12 in addition to the movable spring receiver 54, so that an excessive biasing force is prevented from acting on the shutter 22 from the shutter spring 8 and the shutter 22 is , Is held at the closed position by the preload of the shutter spring 8. Therefore, even when the biasing forces of the two shutter springs 8 vary due to manufacturing variations or the like, the shutter 22 can accurately hold the shutter 22 at the closed position.

On the other hand, as shown in FIGS.
For example, when the opening / closing pin 70 of the shutter opening / closing mechanism (not shown) on the optical disk drive side moves along the front end surface of the case 12 and engages with the step portion 51 of the shutter 22, the shutter 22 moves from the closed position to any open position. The movable spring receiver 54 positioned on the shutter open side of the movable spring receiver 54 of the shutter 22 is moved from the position aligned with the locking spring receiver 38 of the case 12 into the spring housing portion 30 on the shutter open side. Go to At this time, the movable spring receiver 54 holds the movable end 11 while maintaining the engagement state with the movable end 11b of the shutter spring 8 located on the shutter open side.
b is pressed toward the spring accommodating portion 30 to be separated from the locking spring receiver 38. The movable spring receiver 54 is provided with the shutter 22.
Until reaches the open position, the movable end 11b of the shutter spring 8 is pressed and moved to the vicinity of the fixed end 11a.

The movable spring receiver 54 and the fixed spring receiver 3
The shutter springs 8 are shifted from each other in the insertion direction of the cartridge 10, and the fixed arm 9a of each shutter spring 8 is formed shorter than the movable arm 9b. Therefore, even when the shutter 22 is moved to the open position, the movable spring receiver 54 and the fixed spring receiver 34 do not interfere with each other, and the fixed end 11a and the movable end 11b of the shutter spring 8 interfere with each other. Not even. Therefore, the shutter 22 can be reliably and smoothly opened.

Further, a notch 22c is formed at the front end of each shielding plate 22a of the shutter 22, so that when the shutter 22 moves to the open position, the protruding portion of the front end corner 12c of the case 12 has the notch. 22c. Therefore, the shutter 22 can sufficiently move to the open position without being obstructed by the front end corner 12c.

Further, among the guide projections of the shutter 22, the guide projection 52b adjacent to the movable arm 9b of the shutter spring 8 is formed shorter than the other guide projection 52a, and the end 56c is cut off and inclined. Alternatively, it is formed in an arc shape. Also, the longer guide projection 5
2a is formed by omitting the end of the first projection 56a facing the movable arm 9b of the shutter spring 8. Therefore, even when the shutter 22 is moved to the open position, these guide projections 52a, 52b and the shutter spring 8
The movable side arm 9b does not interfere with each other, and the shutter 22 can be more reliably and smoothly opened.

On the other hand, the movable spring receiver 5 of the movable spring receiver 54 of the shutter 22
4 moves away from the locking spring receiver 38 of the case 12 with the movement of the shutter 22, and moves in the movement groove 44 of the bridge portion 21 toward the spring opening portion 30 on the shutter open side.

When the movable spring receiver 54 is separated from the locking spring receiver 38, it is also separated from the movable end 11b of the shutter spring 8 on the opposite side. Therefore, the movable end 11b of the shutter spring 8 on the opposite side is maintained in a state of being engaged with the locking spring receiver 38 of the case 12, and the shutter spring 8 located on the side opposite to the shutter open side is held in the initial state. You.

Accordingly, the shutter 22 is moved to the open position by the opening / closing pin 70 while receiving the urging force of only the shutter spring on the shutter open side without being affected by the shutter spring 8 located on the side opposite to the opening direction. You.

Here, as shown in FIG.
2, the width of the shielding part 22a and the center part 16a of the window part 16.
Is set such that the central portion 16a is completely opened even when the shutter 22 moves to any open position. The width of the shielding portion 22a of the shutter 22 and the width of the extending portion 16b of the window portion 16 are different from the center line C of the window portion 16 and the extending portion 1 when the shutter 22 is moved to each open position.
The distance d1 between the shutter 22 and the opposite edge of the shutter 22 is set to be larger than the distance d2 between the center line C and the edge of the shutter shielding portion 22a on the window side.

Thus, when the cartridge is loaded in an optical disk drive (not shown) and the optical head 70 performs information processing on the optical disk 14 with the shutter 22 opened, interference between the optical head 70 and the shutter 22 is prevented. , Smooth information processing becomes possible. Further, since the bridge portion 21 of the case 12 is formed to have a thickness smaller than the thickness of the case, when the optical head 70 moves, interference between the optical head and the bridge portion is prevented.

As shown in FIG. 21, when the disk cartridge 10 is loaded at a predetermined position of the optical disk drive, it is mounted on the tray 80 on the drive side and the front end of the case 12 is Abut Here, since the front end corner 12c of the case 12 is formed to protrude forward from the case front end face 12a by a distance L (see FIG. 4A), when the shutter 22 is moved to the open position, A predetermined gap g is formed between the connecting plate 22b of the second member 22 and the stopper 81. Accordingly, the shutter 22 can smoothly move to the open position without the connecting plate 22b being caught by the stopper 81.

When the pressing force applied to the shutter 22 by the opening / closing pin 70 is removed when the shutter is closed, the shutter 22 is pressed toward the closed position by the open-side shutter spring 8 engaged with the shutter. And moved to the closed position. When the shutter 22 moves to the closing position, the movable spring receiver 54 of the shutter
And aligned with. Then, the movable end 11b of the shutter spring 8 that has pressed the shutter 22 also engages with the locking spring receiver 38 of the case 12, and thereafter, excessive bias acting on the shutter 22 is restricted. As a result, the shutter 22 is held at the closed position.

When the shutter spring 8 returns from the contracted state shown in FIG. 21 to the initial state shown in FIG. 17, that is, when the shutter 22 returns from the open position to the closed position, the arm 9b of the shutter spring Immediately before returning to the initial state, the guide surface 36 provided on the inner surface side of the case 12 is provided.
Guided to a predetermined position by a. Therefore, the movable end 11b of the arm 9b is
Can always be accurately engaged at a fixed position.

Therefore, even when the shutter spring 22 is slightly displaced due to the opening / closing operation of the shutter 22, the shutter spring can be reliably returned to the predetermined initial state every time the shutter returns from the open position to the closed position. As a result, it is possible to prevent the shutter spring from coming off or being caught, thereby improving reliability.

When the shutter 22 moves to the other open position, the operation of each part is the same, except that the operation direction is reversed. According to the disk cartridge 10 configured as described above, the shutter 22 can be opened and closed in both directions with a simple configuration in which the pair of shutter springs 8 are provided on both sides of the window portion 16, and the shutter is located at the center. Can be held at the closed position.

The disc cartridge 10 includes a case 12, a shutter 22, a pair of shutter springs 8,
And the minimum number of parts
The shutter 22 can be mounted on the case only by inserting it into the case 12 from the front end side, and similarly, a pair of shutter springs can be mounted on the case only by inserting it through the opening 32 of the case. Therefore, the assembling is easy, and the automatic assembling of the disk cartridge becomes possible.

Further, the disk cartridge 1 having the above configuration
According to 0, although the pair of left and right shutter springs 8 is provided, the opening and closing operation of the shutter 22 is performed by only one shutter spring corresponding to the opening direction. That is, when the shutter 22 moves to one open position, the movable end 11 of the shutter spring 8 provided on the shutter open side is moved.
b is the distance between the locking spring receiver 38 of the case 12 and the shutter 22.
The movable end 11b of the other shutter spring 8 is separated from the movable spring receiver 54 of the shutter 22 and is held in a state of being engaged with the locking spring receiver 38 of the case 12.

Accordingly, the shutter 22 is opened and closed without being affected by the other shutter spring 8 and in a state of being engaged only with the shutter spring 8 on the open side. As a result, the opening / closing stroke of the shutter 22 can be made sufficiently large, and, for example, a disk cartridge containing a large-diameter optical disk having a diameter of about 120 mm can be handled.

Further, the disk cartridge 1 having the above configuration
According to 0, although the opening 32 for inserting the shutter spring 8 is formed on both sides of the bridge portion 21 at the front end of the case 10, the movement of the shutter 22 can be reliably guided. .

That is, when the guide projections 52 a and 52 b provided on the shutter 22 move on the bridge portion 21, the inner projection 56 a is moved to the first portion 40 of the guide groove 40.
a, the outer projection 56b engages with the second portion 40b of the guide groove 40 formed on the inner surface of the case 12 when the shutter 22 is moved in each opening 32. This guides the movement of the shutter 22. Therefore, at any of the movement positions, the movement of the shutter 22 can be reliably guided by the guide protrusions 52a and 52b.

Since the four corners of the case 12 are formed in an arc shape having a radius of 4 mm or less, erroneous mounting of the disk cartridge 10 on the CD caddy drive can be reliably prevented. At this time, the width of the corner portion 12c on the front end side of the case is limited by the interference with the shutter 22.
Is provided, interference with the shutter 22 can be prevented, and the width W of the corner portion 12c can be sufficiently ensured. Therefore, the front end corner 12c of the case can be formed in a desired arc shape to prevent erroneous mounting.

The connecting plate 22b of the shutter 22 is provided with a pair of steps 51 with which the opening / closing pins 70 of the shutter opening / closing mechanism are engaged. It is set to be much larger than. Therefore,
During the opening / closing operation of the shutter 22, the opening / closing pin 70 can be reliably engaged with the step portion 51, and the stable opening / closing operation of the shutter 22 becomes possible.

Further, since the region of the front end surface 12a of the case 12 where the connecting plate 22b of the shutter 22 slides is formed recessed toward the rear end of the case, the connecting plate 22b interferes with the stopper on the drive side. Shutter 2
2 can be smoothly opened and closed.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, in the above embodiment, the shutter 22
Has two pairs of guide projections 52a and 52b. However, the same operation and effect as those of the above-described embodiment can be obtained with a configuration in which only one pair of these guide projections is provided. In this case, the guide projections 52a and 52b are provided at the center of the connecting plate 22b of the shutter 22, and have a sufficiently large width along the moving direction of the shutter 22.

In the above-described embodiment, the width W of the case front end corner 12c is ensured by providing the notch 22c in the shielding plate 22a of the shutter 22, but the present invention is not limited to this. As shown in FIG. 22, each shielding plate 22a of the shutter 22 is formed so that its width gradually decreases from its free end side toward the connecting plate 22b side, and at the same time, the recess 15 of the case 12 May be formed so that the width gradually decreases from the rear end side to the front end surface 12a side. Even with such a configuration, the width of the case front end corner 12c can be secured to a predetermined value,
Erroneous mounting of the disk cartridge can be prevented.

Alternatively, as shown in FIG. 23, an arc-shaped notch 84 may be formed in a portion of both side edges of each shielding plate 22a adjacent to the center portion 16a of the window portion 16. According to this configuration, the notch 84 completely opens the central portion 16a of the window 16 without opening the shutter 22 to its limit. Therefore, the width of the case side edge portion including the front end corner portion 12c of the case 10 can be widened, and the corner portion 12c can be formed in an arc shape having a sufficient width.

In the present invention, as the information recording medium,
The present invention is not limited to an optical disk having a recording / reproducing surface on both sides, and an optical disk having a recording / reproducing surface on only one side may be used.

FIGS. 24 and 25 show a single-sided disk cartridge. An optical disk (not shown) having a recording / reproducing surface only on one side is accommodated in the case 12 of the cartridge. As shown in FIG.
In the surface of the case 12 opposite to the recording / reproducing surface of the optical disk, that is, at the rear end corner of the effective surface, a detection hole 86 for an effective surface non-effective surface and write holes located on both sides of the detection hole 86 are provided. A protection through-hole 87 and a spare through-hole 88;
Are formed. These detection holes 86, through holes 87, 8
Reference numerals 8 are provided side by side on a straight line parallel to the sliding direction G of the shutter 22. Also, at both ends of the rear part of the case 12,
A pair of reference positioning holes 24 for positioning the disk cartridge with respect to the optical disk drive are formed.

The distance d3 between the detection hole 86 and the through-hole 87, the distance d4 between the detection hole 86 and the through-hole 88, and the distance d5 between the through-hole 88 and the reference positioning hole 24 are all a plurality of commercially available micro-microstrips. It is set to be the same as the interval between the detection pins of the switch or an integral multiple thereof. For example, each distance is
It is set to 5.5 mm or an integral multiple thereof. Therefore, it is possible to perform various detections using a commercially available multiple microswitch.

The four corners of the case 12 are formed in an arc shape with a radius of 4 mm or less. Further, the pair of case front end corners are formed to have mutually different widths. That is,
The width W1 of the front end corner portion 12d on the side that comes into contact with the erroneous insertion prevention stopper pin on the drive side (not shown) is, for example, 3.8+.
The width W2 of the front end corner 12e on the side that does not contact the stopper pin is set to 0.5 mm, and is smaller than W1, for example, 3.8 to 0.5 mm. Along with this, a cutout 22c is formed in the shielding plate 22a of the shutter 22 only at the end on the side of the front end corner 12d.

The guide slot 19 is
Of the side walls, it is formed only on the side wall on the side of the front end corner 12d. As shown in FIG. 25, the opposite surface of the case 12,
That is, at the rear end portion of the non-effective surface side, no detection holes such as a detection hole for the non-effective surface, a through hole for write protection, and a through hole for reference positioning are not formed. That is, these detection holes are provided only on the effective surface side of the case 12.

As shown in FIGS. 24 and 25, a disk entrance 92 is formed in the rear wall of the case 12 so as to extend over the entire rear wall. At the rear end of the case 12, a lid 90 that opens and closes a disk slot 92 is rotatably attached. Then, by rotating the lid 90 to open the disk entrance 92, the optical disk is moved through the disk entrance 92 to the case 1.
2 can go in and out. Therefore, the optical disk can be used in any form of a disk cartridge stored in the case 12 and a single disk taken out of the case.

The other structure is the same as that of the above-described embodiment, and the same portions are denoted by the same reference characters and will not be described in detail. In the single-sided disk cartridge configured as described above, the same operation and effect as those of the above-described embodiment can be obtained. Further, according to the present embodiment, the width of the one front end corner 12d is formed sufficiently large and the detection hole is provided only on the effective surface of the case 12, so that the optical disk drive can be effectively used. It is possible to reliably prevent the wrong orientation between the surface and the non-effective surface.

[0105]

As described in detail above, according to the present invention, the shutter can be opened and closed in both directions with a simple structure having only a pair of shutter springs, and the shutter can be reliably moved to the closed position. Can be retained,
A disk cartridge that can be automatically assembled can be provided.

Further, according to the present invention, since the shutter is biased by using only one of the shutter springs in accordance with the opening direction of the shutter, a simple configuration in which the opening and closing stroke of the shutter can be set large. Can be provided. Further, according to the present invention, it is possible to provide a disk cartridge capable of reliably preventing erroneous mounting on a disk drive.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disk cartridge according to an embodiment of the present invention, with a shutter closed.

FIG. 2 is an exploded perspective view of the disk cartridge.

FIG. 3 is a perspective view of the disk cartridge in a state where a shutter is opened.

FIG. 4 is an enlarged plan view showing a front end of a half case of the disk cartridge, an enlarged view of a fixed spring receiver, and a side view showing an enlarged guide slot of the disk cartridge.

FIG. 5 is an exploded perspective view showing a bridge portion of a case of the disk cartridge.

FIG. 6 is a front view of the case.

FIG. 7 is a perspective view showing a bridge portion of the case.

FIG. 8 is a perspective view showing an inner surface side of a shutter of the disk cartridge.

9 is a sectional view taken along line BB of FIG. 8, a sectional view of a guide protrusion, and a plan view of a shutter protrusion.

FIG. 10 is a plan view showing a front end portion of the disk cartridge in a state where the shutter is closed.

FIG. 11 is a perspective view showing a positional relationship between a locking spring receiver of the case and a movable spring receiver of the shutter when the shutter has moved to a closing position.

FIG. 12 is a sectional view taken along the line FF of FIG. 10;

FIG. 13 is a plan view showing a front end portion of the disk cartridge in a state where the shutter has moved to an open position.

FIG. 14 is a perspective view showing an engagement state between a guide protrusion of the shutter and a guide groove of a case when the shutter moves from a closed position to an open position.

FIG. 15 is a sectional view taken along lines HH in FIG. 13;

FIG. 16 is a front view of the disk cartridge in which the shutter is in a closed position.

FIG. 17 is a plan view showing the front end of the half case and a pair of shutter springs in a state where the shutter is in a closed position.

FIG. 18 is a perspective view showing a positional relationship between a locking spring receiver of the case and a movable spring receiver of the shutter and an engagement relationship between the spring receiver and a shutter spring in a state where the shutter has moved to a closing position. .

FIG. 19 shows the positional relationship between the locking spring receiver of the case and the movable spring receiver of the shutter and the engagement relationship between these spring receivers and the shutter spring when the shutter moves from the closed position to the open position. FIG.

FIG. 20 is a front view of the disk cartridge with the shutter at an open position.

FIG. 21 is a plan view showing the front end of the half case and a pair of shutter springs in a state where the shutter has moved to an open position.

FIG. 22 is a plan view showing a modified example of the shutter and the case.

FIG. 23 is a plan view showing another modified example of the shutter and the case.

FIG. 24 is a perspective view showing an effective surface side of a disk cartridge according to another embodiment of the present invention.

FIG. 25 is a perspective view showing a non-effective surface side of a disk cartridge according to another embodiment.

[Explanation of symbols]

 Reference Signs List 8 shutter shutter 8a coil part 9a, 9b arm 10 disk cartridge 11a fixed end 11b movable end 12 case 12a front end surface 12c, 12d, 12e front end corner 13 half case 14 optical disk 16 Window 19 ... Guide slot 21 ... Bridge 22 ... Shutter 22a ... Shielding plate 22b ... Connecting plate 22c ... Notch 24 ... Reference positioning hole 30 ... Spring receiving part 32 ... Opening part 34 ... Fixed spring receiver 38 ... Lock spring receiver 40 ... Guide groove 40a ... First part 40b ... Second part 44 ... Movement groove 50 ... Protrusion part 51 ... Step part 54 ... Movable spring receiver 70 ... Opening / closing pin 84 ... Notch part 86 ... Detection holes 87,88 ... (Detection hole)

Claims (14)

[Claims] 1. A case containing a disk-shaped recording medium and having a window exposing a part of the recording medium, a closing position for closing the window, and positions on both sides of the window. Two open positions for opening the windows, respectively; a shutter movably attached to the case; and a shutter disposed inside the case on both sides of the shutter, each of which faces the shutter toward the closed position. A pair of shutter springs biased and held at the closed position, wherein the case includes two parallel main surfaces each having the window formed therein, a front end surface, and two parallel side surfaces. And a spring accommodating portion formed on both sides of the window portion and accommodating the shutter spring, respectively, and an opening at a front end surface of the case. A shutter that is in communication with the shutter housing and through which the shutter spring can be inserted; and a bridge that is located between the openings and faces the window. A pair of substantially rectangular shielding plates closing the window portion, and a connecting plate which is located opposite to the front end face of the case and connects the pair of shielding plates to each other, The four corners of the case have a radius of about 4 ± 0.
A disk cartridge formed in a 2 mm arc shape. 2. A pair of front end corners located on the front end face side among the corners of the case project from the front end face by a predetermined length, and at least one of the front end corners has an arcuate portion. The width along the moving direction of the shutter is 3.6
2. The disk cartridge according to claim 1, wherein the disk cartridge is formed to have a thickness of not less than mm. 3. The at least one front end corner has an arc-shaped portion having a width of 3.8 + 0.5 mm, and the other front end corner has an arc-shaped portion having a width of 3.8-0.5 mm. 3. The disk cartridge according to claim 2, wherein the disk cartridge is set. 4. The shutter according to claim 1, wherein the shutter has a notch for partially accommodating the at least one front end corner when moved to the closed position. The disc cartridge as described. 5. The shutter according to claim 1, wherein each shielding plate of the shutter is formed so as to gradually increase in width from the connecting plate side to the free end side. The disk cartridge according to the item. 6. A window according to claim 1, wherein each of said windows is located substantially at the center of said main surface and has a substantially circular center facing said center of said recording medium, and extends from said center to said bridge. A substantially rectangular extension, wherein each shielding plate of the shutter is located on both sides of the center of the window at the closed position, and faces the center of the window at the closed position. The disk cartridge according to any one of claims 1 to 3, further comprising an arc-shaped notch. 7. A case containing a disk-shaped recording medium and having a window exposing a part of the recording medium, a closing position for closing the window, and positions on both sides of the window. Two open positions for opening the windows, respectively; a shutter movably attached to the case; and a shutter disposed inside the case on both sides of the shutter, each of which faces the shutter toward the closed position. A pair of shutter springs biased and held at the closed position, wherein the case has two parallel main surfaces each having the window formed therein, a front end surface, a rear end surface, and two parallel main surfaces. A spring receiving portion formed on both sides of the window portion and containing the shutter springs, and a front end surface of the case. And two opening portions communicating with the spring accommodating portion and through which the shutter spring can be inserted, and a bridge portion located between the opening portions and opposed to the window portion. A detection hole formed at each corner on the rear end face side, and a detection area extending at a predetermined width along each side surface at the end on the rear end face side and having no detection hole. The shutters each include a pair of substantially rectangular shielding plates that are respectively located on the main surface of the case and close the window, and the pair of shielding plates are located opposite to a front end surface of the case. A disk cartridge, comprising: a connecting plate connecting the plates to each other; and being provided movably along an extending direction of the front end surface of the case. 8. A case containing a disk-shaped recording medium and having a window exposing a part of the recording medium, a closing position for closing the window, and positions on both sides of the window. Two open positions for opening the windows, respectively; a shutter movably attached to the case; and a shutter disposed inside the case on both sides of the shutter, each of which faces the shutter toward the closed position. A pair of shutter springs biased and held at the closed position, wherein the case has two parallel main surfaces each having the window, a front end surface, a rear end surface, and two parallel main surfaces. A spring receiving portion formed on both sides of the window portion and containing the shutter springs, and a front end surface of the case. Two openings respectively communicating with the spring accommodating portion and through which the shutter spring can be inserted, a bridge portion located between the openings and facing the window, and at least one main surface on the rear end surface side. And a plurality of detection holes formed at the corners, and the interval between the plurality of detection holes is 5.5 mm or 5.5 mm.
The shutter is set to an integral multiple of 5 mm. The pair of shutters is located on the main surface of the case and closes the window, and a pair of substantially rectangular shielding plates are positioned opposite to the front end surface of the case. And a connecting plate connecting the pair of shielding plates to each other, and provided movably along an extending direction of the front end surface of the case. 9. A case containing a disk-shaped recording medium having an information recording surface on one surface and having a window exposing a part of the recording medium, and a closing position for closing the window. And two open positions respectively located on both sides of the window to open the window, a shutter movably attached to the case, and disposed on both sides of the shutter in the case, respectively. A pair of shutter springs for urging the shutter toward the closed position and holding the shutter at the closed position, wherein the case has the window and an effective surface facing the information recording surface of the recording medium. A flat rectangular shape having the window portion, a non-effective surface facing the other surface of the recording medium, a front end surface, a rear end surface, and two side surfaces parallel to each other. , On both sides of the window A spring accommodating portion formed therein and accommodating the shutter spring, two openings which are open at the front end face of the case and communicate with the spring accommodating portion, respectively, and through which the shutter spring can be inserted; A bridge portion positioned between the bridge portion and the window portion, and a plurality of detection holes formed only on the effective surface, wherein the shutter is located on a main surface of the case and the window portion is disposed on the main surface of the case. A pair of substantially rectangular shielding plates to be closed, and a connecting plate located opposite to the front end surface of the case and connecting the pair of shielding plates to each other, and extending direction of the front end surface of the case. A disk cartridge movably provided along the line. 10. The case has a guide slot formed on at least one side surface, and the guide slot extends from a substantially intermediate portion of the side surface to a front end surface of the case, and is provided on the front end surface side. 10. The disc cartridge according to claim 1, wherein an end of the disc cartridge is formed so as to gradually increase in width toward the front end face. 11. A guide means for guiding the movement of the shutter, wherein the guide means is formed on a first portion formed on the bridge portion and on an inner surface of the case in each of the spring receiving portions. A pair of guide grooves having a pair of second portions linearly aligned with the first portion and extending along a front end surface of the case on each main surface side of the case; A pair of guide projections provided on the connecting plate of the shutter so as to face each other so as to sandwich the guide projections, the guide projections moving on the bridge portion and in each spring accommodating portion in accordance with the movement of the shutter. A first projection which engages with the first portion when moving on the bridge portion, and a second projection which engages with the second portion when moving within the spring accommodating portion. Has 2. The method according to claim 1, wherein
0. The disk cartridge according to any one of 0. 12. The case has a locking spring receiver located adjacent to the window and a fixed spring receiver located near a side surface of the case in each of the spring accommodating portions. 12. The disk cartridge according to claim 11, further comprising a pair of movable spring receivers protruding from the connection plate and aligned with the locking spring receivers at the closed position. 13. The locking spring receiver is formed on the bridge portion so as to face the spring receiving portion, and the bridge portion extends through the vicinity of the locking spring receiver and is provided on the shutter. 13. The disk cartridge according to claim 12, further comprising a moving groove in which the movable spring receiver moves. 14. Each of the shutter springs is formed of a torsion spring, and has a fixed end engaged with the fixed spring receiver and the locking spring receiver and a movable member aligned therewith when the shutter is in the closed position. When the shutter is engaged with the spring receiver and the shutter moves from the closed position toward one open position,
When the shutter moves toward the fixed end and separates from the locking spring receiver while being engaged with the movable spring receiver, when the shutter moves from the closed position toward the other open position, the shutter moves from the movable spring receiver. 14. The disk cartridge according to claim 13, further comprising a movable end that is separated and held by the locking spring receiver.