JP3286992B2 - Disc cartridge shutter lock mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording device provided in a disk cartridge containing a disk-shaped information recording medium such as an optical disk capable of recording information signals such as tone signals and video signals. The present invention relates to a shutter lock mechanism for a disk cartridge that holds a shutter member that opens and closes an opening at a position where the opening is closed.

[0002]

2. Description of the Related Art Conventionally, a disc which is a disc-shaped information recording medium such as an optical disc capable of recording an information signal such as a musical tone signal or a video signal is housed in a rectangular cartridge body. Cartridges are widely used.

As described above, by accommodating the disc in the cartridge main body, adhesion of dust to the disc and damage to the disc are prevented, and the protection of the disc is achieved.

[0004] Conventionally, as a disk cartridge accommodating an optical disk, a disk cartridge configured as described below is used.

That is, this disk cartridge is
As shown in FIG. 11, a cartridge body 4 having a rectangular shape for accommodating the optical disk 1 configured by butt-joining an upper half 2 and a lower half 3 is provided.
In the cartridge main body 4, a disk storage section for rotatably storing the optical disk 1 is formed.

The cartridge body 4 has a disk table entry opening 5 into which a disk table of a disk rotation drive for rotating the optical disk 1 housed in the cartridge body 4 is inserted when the disk cartridge is mounted on a recording / reproducing apparatus. Has been established. The disk table entry opening 5 is formed so that an inner peripheral portion including a center hole 1a placed on the disk table of the optical disk 1 housed in the cartridge body 4 can face outward. As shown in FIG. 13, the lower half 3 is formed with a circular opening substantially at the center.

The upper and lower halves 2 and 3 constituting the upper and lower surfaces of the cartridge body 4 are provided with information signals for causing at least a part of the signal recording area of the optical disk 1 housed therein to face outward over the inner and outer circumferences. Openings 6 and 7 for recording and reproduction are provided. These information signal recording / reproducing openings 6, 7
As shown in FIG. 11, a rectangular shape is formed at a position substantially at the center in the left-right direction of the cartridge main body 4 from a position close to the disk table entry opening 5 to a front side of the cartridge main body 4. It becomes.

Further, dust is prevented from entering the cartridge body 4 through the information signal recording / reproducing openings 6 and 7 and adhering to the optical disk 1 stored therein. Therefore, a shutter member 8 for closing the information signal recording / reproducing openings 6 and 7 is provided.
The shutter member 8 is formed by punching and bending a thin metal plate, and includes shutter portions 8a and 8b for closing the information signal recording / reproducing openings 6 and 7, respectively.
A connecting piece 8c for connecting the base ends of these shutter portions 8a and 8b is formed, and is formed in a U-shaped cross section as a whole. On one side of the connecting piece 8c, a slide guide portion 9 for projecting so that the shutter member 8 can slide in parallel along the front side of the cartridge main body 4 is provided in a protruding manner.

The shutter member 8 is fitted from the front side of the cartridge body 4 so that the shutter portions 8a and 8b extend over the information signal recording / reproducing openings 6 and 7, respectively. 13 and the closing positions of the information signal recording / reproducing openings 6 and 7 as indicated by solid lines in FIG. 13 and the information signal recording / reproducing openings 6 and 7 as indicated by virtual lines in FIG. And is mounted on the cartridge body 4 so as to be slidable between opening positions where the cartridge is opened.

On the other hand, a shutter member 8 is provided at one corner on the front side of the lower half 3 constituting the cartridge body 4.
In order to prevent the information signal recording / reproducing openings 6 and 7 from being opened by careless movement when the information signal recording / reproducing openings 6 and 7 are closed, As shown in FIGS. 11 and 12, a shutter lock member 11 that engages with the engaged piece 10 formed by bending a part thereof and holds the shutter member 8 at the closed position is provided.

The shutter lock member 11 is formed by molding a synthetic resin.
As shown in FIG. 1, the attachment portion 12 to the lower half 3 is provided on the base end side.
The lock arm 13 which is curved and extends from one end of the mounting portion 12. A notch engaging portion 14 with which the engaged piece 10 provided on the shutter member 8 is relatively engaged is formed at the top on the outer surface side of the lock arm portion 13. The portion of the lock arm 13 that is connected to the mounting portion 12 on the base end side is an elastic displacement portion 15 that is formed to be thin and elastically displaceable.

The shutter lock member 11 thus formed is provided with a pair of mounting pins 16
16 is fitted to the lower half 3 so that the notch engaging portion 14 faces the front face of the cartridge body 4 as shown in FIG.

When the shutter member 8 attached to the cartridge body 4 is slid to the position for closing the information signal recording / reproducing openings 6 and 7, as shown in FIG. Is engaged with the notch engaging portion 14 of the shutter lock member 11, and is locked at the position where the information signal recording / reproducing openings 6, 7 are closed.

As described above, the disk cartridge provided with the shutter lock member 11 for locking the shutter member 8 at the position where the information signal recording / reproducing openings 6 and 7 are closed,
When the user inserts the cartridge into the cartridge mounting portion of the recording / reproducing apparatus with the direction indicated by arrow A in FIG. 12 being inserted, the shutter provided on the recording / reproducing apparatus side in the shutter opening operation member insertion groove 18 formed on the front side of the cartridge body 4. The release operation pin 20 enters. When the disc cartridge is inserted into the disc mounting portion, the shutter opening / closing pin is moved to the lock arm portion 13 of the shutter lock member 11.
Ride up from the base side outer surface toward the tip side,
While the elastic displacement portion 15 is elastically displaced, the lock arm portion 13 is pressed toward the inside of the cartridge body 4 in the direction of arrow B in FIG. By the inward movement of the lock arm 13 to the cartridge body 4, the engagement of the engaged piece 10 with the notch engaging portion 14 is released, and the shutter member 8 is moved by the shutter opening operation pin 20 to the information signal. It is moved in a direction to open the recording and reproducing openings 6 and 7.

By the way, a conventionally used shutter lock member 1 of a disk cartridge is used.
Since No. 1 is formed as a molded body of a synthetic resin, it is extremely difficult to form it with sufficient molding accuracy due to heat shrinkage and the like during molding.

FIG. 14 shows a conventional shutter lock member 11 in which a lock arm 13 is extended from one end of an attachment portion 12 through an elastic displacement portion 15.
As shown in (1), the height dimension (h) from the mounting portion 12 serving as the mounting reference to the cartridge body 4 to the top of the lock arm portion 13 where the notch engaging portion 14 is formed becomes inconsistent. Therefore, when the mounting portion 12 is mounted on the cartridge main body 4 based on the mounting reference, the shutter opening / closing member insertion groove 18 formed on the front surface of the cartridge main body 4 is formed.
, The position of the lock arm portion 13 is not constant, and the amount of pressing displacement when the pressing operation is performed by the shutter opening / closing pin 20 varies. As a result, there is a possibility that a stable unlocking operation of the shutter member 8 cannot be performed.

Further, the engaged piece 10 is provided with the notch engaging portion 1.
4, the shutter member 8 cannot be securely locked at the opening closed position, the information signal recording / reproducing openings 6, 7 are inadvertently opened, and the optical disk housed in the cartridge body 4 1 may be damaged.

Therefore, the present invention makes it possible to securely lock the shutter member at a position where the opening formed in the cartridge body is closed, even when a shutter member made of synthetic resin is used. The present invention has been proposed for the purpose of providing a disk cartridge shutter lock mechanism capable of reliably protecting a disk housed in a cartridge body.

[0018]

In order to achieve the above object, a shutter lock mechanism for a disk cartridge according to the present invention accommodates a disc-shaped information recording medium and at least one of the information recording media. A cartridge body formed with an opening that allows the portion to face outward in the radial direction; a cartridge body slidably mounted on one side of the cartridge body to open and close the opening and to be formed on the one side of the cartridge body. A shutter member provided with an engaged piece facing the opened shutter opening operation groove;
The pivot portion provided at the proximal end portion is pivotally supported by a support shaft implanted in the cartridge main body, and is supported and disposed so as to be rotatable around the support shaft, and from the proximal end side. The shutter member has an engagement portion with which the engaged piece relatively engages at a position where the opening is closed, and a rotation position regulating step which engages with a position regulating portion formed on the cartridge body. The shutter arm includes a shutter lock member extended so that the lock arm portion and the elastic displacement portion face each other.

Here, the lock arm portion is preferably
The central portion is formed so as to bulge, the engagement portion is provided at the top of the central portion, and the inclined guide surface is formed at the distal end side.

[0020]

In the shutter lock mechanism of the disk cartridge according to the present invention, the shutter member closes the opening of the cartridge body by the engaged piece of the shutter member engaging with the lock arm of the shutter lock member. Hold in position.

When the distal end of the lock arm is pressed, the shutter lock member is rotated around the pivot while elastically displacing the elastically displaceable portion, so that the engagement portion of the engagement piece of the shutter member is engaged. Is disengaged.

[0022]

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

First, a description will be given of a disk cartridge to which the shutter lock mechanism according to the present invention is applied. As shown in FIG. And a cartridge body 34 having a rectangular shape formed by abutting and joining the cartridge bodies 33 to each other. In the cartridge body 34, a disc-shaped information recording medium, for example, an optical disc 31 capable of re-recording an information signal is rotatably housed to form a disc cartridge.

On the outer periphery of the upper half 32 and the lower half 33 constituting the cartridge body 34, rising peripheral walls 35a and 35b which abut against each other and constitute the outer peripheral wall 35 of the cartridge body 34 are formed. On the inner surfaces of the upper half 32 and the lower half 33 that oppose each other, disk storage portion forming walls 36a and 36b that abut against each other to form a disk storage portion are formed to rise. These disk storage portion forming walls 36a, 36b
Is formed so as to form an arc inscribed in each of the rising peripheral walls 35a and 35b. Furthermore, butt fitting projections 37a and 37b which are butt-fitted with each other on the opposing inner surfaces of the upper half 2 and the lower half 3 respectively.
Is protruding.

The upper half 32 and the lower half 33 are
The rising peripheral walls 35a and 35b and the disk storage portion forming walls 36a and 36b are butted, and the butting fitting projections 37a and 37b are fitted to each other, and the butting fitting projections 37a and 37b are welded or the like. Thus, the cartridge main body 34 that is integrated by being coupled and rotatably stores the optical disk 31 is configured.

When the disc cartridge is mounted on the recording / reproducing apparatus, the optical disk 31 housed in the cartridge main body 34 is rotated and operated. An opening 38 for entry of a disk table into which a disk table of a rotating disk drive enters is provided. Specifically, the disk table entry opening 38 includes a center hole 31a of the optical disk 31 housed in the cartridge body 34 and a metal plate 31b for closing the center hole 31a and provided for a magnet clamp. As shown in FIG. 1, the lower half 32 is formed with a circular opening substantially at the center thereof so that the peripheral portion of the center hole 31 a placed on the table can face outward.

The upper and lower halves 32 and 33 forming the upper and lower surfaces of the cartridge body 34 are provided with information signals for causing at least a part of the signal recording area of the optical disk 31 housed therein to face outward over the inner and outer circumferences. Recording / reproducing opening 3
9, 40 are set up facing each other. As shown in FIGS. 1, 2 and 3, the information signal recording / reproducing openings 39 and 40 extend from the position close to the disk table entry opening 38 to the front side of the cartridge body 34. 34 is formed in a square shape at a substantially central position in the left-right direction.

The cartridge body 34 includes:
In order to prevent dust and the like from entering through the information signal recording / reproducing openings 39 and 40 and sticking to the optical disk 31 stored therein, the information signal recording / reproducing openings 39 and 40 are prevented. A shutter member 41 for closing the opening 39 is movably attached to open and close the openings 39 and 40.

On the front side of the cartridge body 34 where the shutter member 41 moves, a recording / reproducing apparatus is provided for moving the shutter member 41 for opening and closing the information signal recording / reproducing openings 39 and 40. A shutter opening operation pin insertion groove 42 into which the shutter opening operation pin enters is formed. As shown in FIGS. 2 and 3, the shutter opening operation pin insertion groove 42 has an opening end 42 a on one side surface orthogonal to the front surface of the cartridge body 34 and is formed in the movement direction of the shutter member 41. Become.

A shutter slide guide wall 43 for ensuring stable movement of the shutter member 41 is formed in the shutter opening operation pin insertion groove 42. As shown in FIG. 1, the shutter slide guide wall 43 is formed upright on the inner surface of the lower half 33.

The inner surface of the front edge of the information signal recording / reproducing opening 39 formed in the upper half 32 is abutted against the inner surface of the lower half 33 and the cartridge in the shutter opening operation pin insertion groove 42 is formed. A butt wall 44 that functions to prevent the thickness of the main body 34 from bending in the thickness direction is formed upright.

The information signal recording / reproducing openings 39,
A shutter member 41 for opening and closing the shutter 40 is formed by punching and bending a thin metal plate. The shutter members 41a and 41b for closing the information signal recording / reproducing openings 39 and 40, respectively, Parts 41a, 41b
And a connecting piece 41c for connecting the base end side of the base member, and is formed in a U-shaped cross section as a whole.

At both ends of the connecting piece 41c, first and second slide guide portions 45, which guide the shutter member 41 to move stably in parallel along the front side of the cartridge body 34, 46 are protrudingly provided, respectively. These first and second slide guide portions 45, 4
6 is formed by bending formed so as to form a U-shaped cross-section having a substantially corresponding height H ₂ to the height H ₁ of the front side of the lower half 33.

When the shutter member 41 is attached to the cartridge body 34, the leading end of the first slide guide portion 45 is inserted into a shutter opening operation pin insertion groove 42 formed on the front side of the cartridge body 34. In addition, an engaged piece 48 which is relatively engaged with a shutter lock member 47 provided in the cartridge body 34 is bent.

The first and second slide guides 4
At the tip of the portion extending to the lower half 33 side of 5, 46,
The stopper half engages with a slide guide groove 49 formed on the outer surface of the lower half 33 to guide the moving direction of the shutter member 41 and to prevent the shutter member 41 from coming off the cartridge body 34. Guide piece 5
0 and 51 are bent.

The shutter member 41 constructed as described above
As shown in FIGS. 2 and 3, each shutter section 41a,
The cartridge 41 is fitted from the front side of the cartridge body 34 so as to extend over the information signal recording / reproducing openings 39 and 40.

At this time, the first and second slide guide portions 45 and 46 are inserted into the shutter opening operation pin insertion groove 42 while the retaining guide pieces 50 and 51 are engaged with the slide guide groove 49. Side portion is extended on the upper end surface of the shutter slide guide wall 43 so that
To support the front side. The engaged piece 48 formed by bending the first slide guide portion 45 is
The shutter-opening operation pin protrudes into the insertion groove 42.

As described above, the shutter member 41 fitted and disposed in the cartridge body 34 so that the front side of the lower half 33 is sandwiched by the first and second slide guide portions 45 and 46 is a retaining guide piece. The sliding direction is guided by the slide guide groove 49 with which the first and second slide guide portions 45 and 46 are slid by the shutter slide guide wall 43, and the information signal recording is performed. Reproduction openings 39, 40
Is slidably attached to the cartridge body 34 between an opening closing position where the opening is closed and an opening opening position where the information signal recording / reproducing openings 39 and 40 are opened.

Incidentally, the information signal recording / reproducing opening 39, in which the shutter member 41 of the cartridge body 34 slides,
Shutter slide recesses 52, 53 having a thickness substantially equal to the thickness of the plate member forming the shutter member 41 are provided in a region extending from the peripheral edge of the shutter 40 to one side surface and the front side of the cartridge body 34.
And 54 are formed. By forming the shutter slide recesses 52, 53 and 54 in this manner, the shutter member 41 can be fitted and disposed flush with the surface of the cartridge body 34, and the shutter member 41 is fitted. The cartridge body 34
Is prevented from being thick.

On the other hand, a shutter member 4 attached to the cartridge
A shutter lock member 47 is provided to hold 1 at a position where the information signal recording / reproducing openings 39 and 40 are closed.

The shutter lock member 47 is formed by molding a synthetic resin or the like, and as shown in FIGS.
The support shaft 5 erected on the inner surface of the lower half 33 that constitutes 4
5 has a pivotal support portion 57 in which an insertion hole 56 is formed, and a concave engaging portion 58 is formed from the pivotal support portion 57 so that the engaged piece 48 formed on the shutter member 41 is engaged with the pivotal support portion 57. The lock arm 59 is extended. Further, an elastic displacement portion 60, which is easily elastically displaced by being pressed, is extended from the pivot portion 57 so as to face the lock arm portion 59.

The lock arm portion 59 constituting the shutter lock member 47 is formed in a substantially rectangular shape so as to protrude at the central portion, and is provided at the top of the protruding portion at the central portion. Engagement piece 4 formed on shutter member 41
8 is formed by notching an engaging portion 58 that is relatively engaged.
The engaging portion 58 is closed on one side of the lock arm portion 59 by a closing wall 59a.
Is formed as a concave portion in which only a portion extending from the top to the other side surface is opened. This prevents the mechanical strength of the lock arm portion 59 from deteriorating by forming the engaging portion 58 in a notch across the thickness direction of the lock arm portion 59, and This is to ensure sufficient mechanical strength.

Further, when the engaged piece 48 formed on the shutter member 41 is relatively engaged with the engaging portion 58 on one side surface of the distal end side of the lock arm portion 59, it is easily and surely engaged. For this purpose, an inclined guide surface 61 for guiding the engaged piece 48 to ride on the lock arm portion 59 is formed.

Further, on the base end side of the lock arm portion 59, the other side surface of the lock arm portion 59 is notched so as to make a portion from the front end side to the base end side thinner, thereby restricting the rotation position. A step 62 is formed. When the shutter lock member 47 is attached to the cartridge body 34, the rotation position regulating step 62
The shutter lock member 47 restricts the rotation position of the shutter lock member 47 by engaging with a later-described shutter lock member rotation restriction wall formed on the inner surface of the lower half 33 constituting the fourth half 4.

On the other hand, a contact portion 63 bulging in a semicircular cross section is formed on the distal end side of the elastic displacement portion 60.

As shown in FIG. 6, the shutter lock member 47 formed as described above allows the pivot portion 57 to be inserted through and supported by the support shaft 55 planted on the inner surface of the lower half 33 through the insertion hole 56. Thus, it is arranged in the cartridge body 34. Then, the shutter lock member 47
The support shaft 55 is supported at the front side of the cartridge body 34, and is disposed in a shutter lock member mounting area 65 of a corner on one side where the opening end 42a of the shutter opening operation pin insertion groove 42 is exposed. It is planted integrally from the lower half 33.

On the front side of the corner where the support shaft 55 of the lower half 33 is erected, a rotation position regulating step formed on the lock arm 59 of the shutter lock member 47 in parallel with the shutter slide guide wall 43. A shutter lock member rotation restricting wall 66 with which the portion 62 is engaged is formed. Further, the corner where the support shaft 55 of the lower half 33 is erected is provided with the disk storage portion forming wall 3 constituting the disk storage portion.
6b, the shutter lock member rotation restricting wall 6
A contact support piece 67 is provided so that the contact portion 63 at the tip of the elastic displacement portion 60 of the shutter lock member 47 is supported in parallel with the contact lock piece 67. Furthermore, a lock arm 59 of the shutter lock member 47 is provided on the inner surface of the lower half 33.
A lock arm support lug 68 for supporting the front end of the arm is formed upright.

Then, the shutter lock member 47 is
As shown in FIG. 7, the insertion hole 56 formed in the pivotal support portion 57 is inserted through the support shaft 55, and the rotation position regulating step 62 formed in the lock arm portion 59 is engaged with the shutter lock member rotation regulating wall 66. At the same time, the contact portion 63 at the tip of the elastic displacement portion 60 is supported by the contact support piece 67 so as to be disposed in the shutter lock member mounting area 65 in the lower half 33. At this time, the distal end side of the lock arm portion 59 is supported on the lock arm portion support projection 68.

By arranging in the shutter lock member mounting area 65 in this manner, the shutter lock member 47
As shown in FIG. 6, the lock main body 3 extends along the shutter opening operation pin insertion groove 42 formed on the front side of the cartridge main body 34 so as to form the cartridge main body 3.
4 inside. Then, an engaging portion 58 formed on the top of the lock arm portion 59 faces the shutter opening operation pin insertion groove 42, and the engaged piece 48 of the shutter member 41 sliding on the front side of the cartridge body 34 is engaged. It becomes a state in which relative engagement is possible.

The inner surface of the upper half 32 engages with the lower half 33 to which the shutter lock member 47 is attached so as to slightly protrude from the side surface of the lock arm 59. A concave portion 59b which escapes a closing wall 59a that closes one side surface of the portion 58 is formed.

By arranging the shutter lock member 47 in the cartridge main body 34 as described above, the shutter member 41 closes the information signal recording / reproducing openings 39 and 40 as shown in FIGS. When the moving operation is performed to the closed position of the opening, the engaged piece 48 is engaged with the engaging portion 58 as shown in FIG.

The disk cartridge provided with the shutter lock member 47 is moved in the direction indicated by an arrow X in FIG. 2 in accordance with the insertion direction support mark 70 provided on the upper surface of the cartridge body 34.
When the insertion operation is performed in a cartridge mounting portion provided with a cartridge holder and the like disposed in the recording / reproducing apparatus, the recording / reproducing apparatus is inserted into a shutter opening / closing member insertion groove 42 formed on the front side of the cartridge body 34. The shutter release operation pin 71 provided on the side enters. When the disc cartridge is inserted into the disc mounting portion, the shutter release operation pin 71 is moved to the lock arm portion 5 of the shutter lock member 47 as shown in FIG.
Will ride toward the distal end side from the base end side outer surface of 9, presses the locking arm 59 inwardly in FIG arrow Y ₁ direction of the cartridge holder 34. When the lock arm 59 is pressed, the locking arm portion 59 is rotationally operated in FIG. 7 by the arrow Y ₁ direction around the pivot portion 57 pivotally supported on the support shaft 55, the contact supporting piece 67
The elastically displacing portion 60, which has the contacting portion 63 in contact with the first portion, is elastically displaced. Then, the shutter member 41 is engaged with the engaged piece 48.
Is disengaged from the engaging portion 58, and the device becomes free to move.

After the shutter member 41 has been freely moved, when the disc cartridge is further inserted into the cartridge mounting portion, the shutter member 41 is pressed by the shutter release operation pin 71, and the shutter member 41 shown in FIGS. Sliding operation is performed in the direction of the opening position of the arrow O,
As shown in FIGS. 8 and 9, the information signal recording / reproducing openings 39 and 40 of the cartridge body 34 are opened.

When the shutter member 41 is slid to the opening position, the pressing operation of the lock arm portion 59 is released by the shutter opening operation pin 71, and the elastic displacement portion 60 that has been elastically displaced is elastically returned. The lock arm portion 59 is centered on the pivotal support portion 57 by an arrow Y ₂ in FIG.
In the direction, and the engaging portion 58 faces the shutter opening operation pin insertion groove 42.

In the disk cartridge of this embodiment, the information signal recording / reproducing openings 39, 4 are provided.
When the cartridge is mounted on the cartridge mounting portion in the recording / reproducing apparatus by releasing 0, the shutter closing pin provided on the recording / reproducing apparatus side is engaged. It is drilled substantially at the center of 41c. Then, when the shutter closing pin is engaged with the shutter closing pin engaging hole 72 and the disc cartridge mounted on the cartridge mounting portion is ejected, the shutter member 41 is relatively moved with respect to the cartridge body 34. 2 and 3 in the direction of the closing position of the opening. When the shutter member 41 is slid in this manner, the elastic displacement portion 6
0 engaged piece 48 rides over the locking arm 59 distal end of the inclined guide surface 61 of the shutter locking member 47 in a state of being rotated restored in 10 arrow Y ₂ direction after being rotated is elastically displaced To go. When the disc cartridge is further pulled out from the cartridge mounting portion from here, the engaged piece 48 engages with the engaging portion 58 formed on the shutter lock member 57 as shown in FIG. As shown, the shutter member 41 is locked at the opening closing position.

In the above-described embodiment, an example in which the present invention is applied to a disk cartridge containing an optical disk 31 has been described. However, the present invention is slidable in the cartridge main body so as to open and close an opening formed in the cartridge main body. The present invention can be widely applied to a disk cartridge provided with a shutter member.

[0057]

As described above, the shutter lock mechanism for a disk cartridge according to the present invention has a lock arm portion with which an engaged piece provided on a shutter member is engaged, and a lock arm portion when the lock arm portion is pressed. An elastic displacement portion that elastically displaces is independently formed, and when the lock arm portion is pressed, the elastic displacement portion is displaced and rotated around a pivotal support portion to engage the engaged piece of the shutter member. Since the shutter arm is provided with the shutter lock member for releasing the engagement from the joint, the lock arm on which the engagement part is formed can be formed with high precision, and the shutter member can be reliably locked. That is, since there is no need to provide an elastic displacement portion on the lock arm portion, it is possible to easily form the lock arm portion into a predetermined size even when the lock arm portion is formed by molding of a synthetic resin or the like.

Further, since the shutter lock member is attached to the cartridge main body via the pivotal support, the mounting operation is easy, the detaching operation is easy, and the lock which is pivotally displaced. Since the rotation position regulating step is provided on the arm portion and is engaged with the position regulating portion formed on the cartridge body side, the rotation direction of the lock arm portion is regulated, and stable operation can be realized. A stable and reliable arrangement can be realized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a disk cartridge to which a shutter lock mechanism according to the present invention is applied.

FIG. 2 is a top perspective view of a disk cartridge to which the shutter lock mechanism according to the present invention is applied.

FIG. 3 is a perspective view from the lower surface side of a disk cartridge to which the shutter lock mechanism according to the present invention is applied.

FIG. 4 is a perspective view from one side of a shutter lock member constituting the shutter lock mechanism according to the present invention.

FIG. 5 is a perspective view from the other side of the shutter lock member constituting the shutter lock mechanism according to the present invention.

FIG. 6 is a partial plan view showing a state where the shutter lock member is arranged in a cartridge body.

FIG. 7 is a partial plan view of the cartridge main body in a state where the shutter lock member has been rotated and the shutter member has been unlocked.

FIG. 8 is a perspective view from the top side of the disk cartridge in a state where the shutter member has been moved to the opening opening position.

FIG. 9 is a perspective view from the lower surface side of the disk cartridge in a state where the shutter member has been moved to the opening opening position.

FIG. 10 is a partial plan view of the cartridge main body showing the shutter lock member in a state where the shutter member has been moved to the opening position.

FIG. 11 is an exploded perspective view of a disk cartridge to which a conventional shutter lock mechanism is applied.

FIG. 12 is a perspective view from the top side of a disk cartridge to which a conventional shutter lock mechanism is applied.

FIG. 13 is a perspective view from the lower surface side of a disk cartridge to which a conventional shutter lock mechanism is applied.

FIG. 14 is a partial plan view of a cartridge body showing a conventional shutter lock mechanism.

[Explanation of symbols]

34 cartridge main body, 39, 40 information signal recording / reproduction opening, 41 shutter member, 42 shutter opening operation pin insertion groove, 47 shutter lock member,
48 an engaged portion formed on a shutter member, 55 a support shaft, 57 a pivotal support portion of a shutter lock member, 58 an engagement portion, 59 a lock arm portion, 60 an elastic displacement portion,
61 inclined guide surface, 62 rotation position regulating step, 6
6 Shutter lock member rotation restricting wall, 68 Lock arm portion support projection, 71 Shutter release operation pin

Claims (2)

(57) [Claims] 1. A cartridge body in which a disc-shaped information recording medium is accommodated and at least an opening for exposing at least a part of the information recording medium outward in a radial direction is formed; A shutter member slidably mounted on one side and opening and closing the opening, and a shutter member provided with an engaged piece facing a shutter opening operation groove formed on the one side of the cartridge body; and the pivot portion is pivotally supported on a support shaft which is erected in the cartridge body, while being arranged to be pivotable in the center of the support shaft, it closes the said opening from said proximal end An engaging portion of the shutter member at which the engaged pieces are relatively engaged with each other, and the cartridge body
A lock arm portion having a rotational position regulating step portion engaged with the position regulating portion formed on the shutter member, and a shutter lock member extended so that the elastic displacement portion is opposed to the lock arm portion. A shutter lock mechanism for a disk cartridge. 2. The lock arm portion according to claim 1, wherein a central portion is formed so as to bulge, and the lock arm portion has the engaging portion at a top portion of the central portion and an inclined guide surface at a tip end side. Item 2. A shutter lock mechanism for a disk cartridge according to Item 1.