JPH059869B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk cassette used to house a magnetic sheet disk-shaped recording medium, and particularly relates to a sliding lid provided on the casing. .

[Summary of the invention]

The disk cassette of the present invention has a notch in the sliding lid for slidingly operating the sliding lid provided on the housing, so that the sliding lid can be easily inserted and/or ejected from the recording/reproducing apparatus. The sliding lid can be easily opened and closed automatically, and the sliding lid is difficult to open and close when the disk cassette is not in use.

[Conventional technology]

Conventionally, disk cassettes that rotatably store disk-shaped recording media (hereinafter referred to as ``disks'') such as magnetic sheets have a cross-sectional structure in which openings such as magnetic head insertion holes and pad insertion holes can be opened and closed. Some are covered with letter-shaped sliding lids. This is to prevent dust from entering through the insertion hole and adhering to the recording/reproducing surface of the disk, or from accidentally touching the recording/reproducing surface with your hand or the like and damaging it.

[Problem that the invention seeks to solve]

However, such a disk cassette with a sliding lid has the trouble of having to manually open and close the sliding lid each time before inserting the cassette into the cassette holder of the recording/reproducing apparatus and after ejecting the cassette. Furthermore, since the sliding cover is opened and closed manually, there is a risk that a hand or the like may accidentally touch the recording/reproducing surface of the disk and damage it.

The present invention has been made to solve these problems, and it is possible to easily open and close the sliding lid automatically when inserting and/or ejecting a disk cassette into a recording/reproducing device, and furthermore, To provide a disk cassette whose sliding lid is difficult to open and close when the cassette is not in use.

[Means for Solving the Problems] The disk cassette according to the present invention includes a flat cassette housing made of synthetic resin in which a disk-shaped recording medium is rotatably housed, and a flat cassette housing formed on at least one of the upper and lower surfaces of the cassette housing. an aperture that exposes a part of the disc-shaped recording medium to the outside during recording and reproduction; A sliding lid having a U-shaped cross section for opening and closing the opening, and a notch for sliding operation of the sliding lid formed at a front end of the sliding lid facing a side surface of the cassette housing. It is something.

[Effect]

According to the disk cassette of this invention,
When a disk cassette is inserted into and/or ejected from a recording/reproducing device, the sliding operation means provided on the recording/reproducing device is engaged with the notch of the sliding lid, thereby inserting and/or ejecting the sliding lid. Alternatively, the sliding lid can be easily opened and/or closed automatically using the ejection operation.

Moreover, since the engaging part of the sliding lid with respect to the sliding operation means is configured as a notch rather than a protrusion, when the disk cassette is not in use, it can easily be pulled against other objects when the disc cassette is not in use, unlike when the engaging part is a protrusion. There is less risk of the sliding lid being opened unexpectedly if it gets stuck.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

(Description of configuration of recording and reproducing apparatus) As shown in FIG. 1, the recording and reproducing apparatus 1 includes a main body 2 and a cassette mounting device 3 attached to the main body 2. A flat brushless motor 6 is provided on the chassis 5 of the apparatus main body 2, and a rotary table 7 is integrally attached to a rotating shaft 6a of the motor 6. The rotary table 7 is provided with a rotation drive pin 8 and a magnet 9, respectively. The chassis 5 is also provided with a head support 12 supported at both ends by a feed screw 10 and a guide shaft 11 that are parallel to each other, and a magnetic head 13 is mounted approximately in the center of the head support 12. ing. The feed screw 1 is then driven by a step motor 14 connected to one end of the feed screw 10.
0 rotates intermittently, and the magnetic head 13 is configured to intermittently reciprocate linearly at a constant pitch in the radial direction of the rotating shaft 6a of the brushless motor 6.

On the other hand, as clearly shown in FIG. 2, the cassette mounting device 3 has a pair of left and right side plates 16 and 17 which are screwed and fixed to the chassis 5 of the device main body 2 in a state where they face each other. A cassette holder 18 is provided between the pair of side plates 16 and 17 so as to be movable in the vertical direction. The cassette holder 18 includes an upper plate part 19 and a pair of side plate parts 20 and 21 provided on both left and right sides of the upper plate part 19 and having a U-shaped cross section. A disk cassette 22, which will be described later, is inserted between the pair of side plates 20 and 21, so that both left and right sides of the disk cassette are supported by the side plates 20 and 21. In FIG. 2, reference numeral 15 indicates an insertion portion of the disk cassette 22, and 23 and 24 indicate stopper pieces for preventing movement of the disk cassette 22 in the insertion direction.

Also between the pair of side plates 16 and 17 is a connecting plate 2 that constitutes the vertical movement mechanism of the cassette holder 18.
5 is provided. The left and right sides of the connecting plate 25 form a pair of side plate portions 25a bent downward, and a pair of left and right fulcrum pins 26, 27 are provided on the pair of side plate portions 25a. One of the fulcrum pins 26 is fixed to the side plate 16 with set screws 28 and 29.
The other fulcrum pin 27 is inserted into the pin hole 31 of the mounting plate 30 attached to the vertical piece 3 of the side plate 17.
It is inserted into the pin hole 33 of No. 2. The connecting plate 25 is rotatable in the vertical direction in FIG. 1 about a pair of fulcrum pins 26 and 27. On both the left and right sides of the connecting plate 25, from the both side plate parts 25a to the both side plate parts 20, 21 of the cassette holder 18 and the both side plates 1
A pair of arm portions 34 and 35 are provided between 6 and 17 and extend toward each other. On the other hand, the pair of side plate portions 20 and 21 of the cassette holder 18 are provided with a pair of left and right bracket portions 36 and 37. The distal ends of the pair of arm parts 34, 35 and the pair of bracket parts 36, 37 are rotatably connected by a pair of coupling pins 38, 39. Further, the side plate portion 21 of the cassette holder 18 is provided with another bracket portion 40 below the bracket portion 37. On the other hand, the vertical piece 32 of the side plate 17
Another pin hole 41 is provided below the pin hole 33, and the bracket portion 40 and pin hole 41 are connected by a link plate 42 that is substantially parallel to the arm portion 35 of the connecting plate 25. In Figure 2, 43,
44 are both ends of the link plate 42 and the bracket part 40
and a stop pin for interconnecting the pin holes 41, respectively. Arm part 35, link plate 4
2. The vertical piece 32 and the brackets 37 and 40 constitute a parallel quadruple link, so that the cassette holder 18 can move up and down while maintaining its horizontal position. Note that one side plate portion 25a of the connecting plate 25 is provided with a spring locking portion 45, while the side plate 16 is provided with another spring locking portion 46 located below this spring locking portion 45. There is. A tension spring 47 is interposed between the pair of upper and lower spring locking parts 45 and 46, and the connecting plate 25 is connected to the tension spring 47.
is constantly urged to rotate downward.

As shown in FIG.
52 are provided. These long holes 50-52
, long holes 50 and 51 are arranged on the left and right, and long hole 52
is arranged on the rearward extension line of the elongated hole 51.
The upper plate portion 19 is also provided with an inclined guide groove 53 inclined at approximately 45 degrees with respect to the elongated holes 50 to 52, and a notch 54 located on the side of the guide groove 53. The front and rear ends of the inclined guide groove 53 have a pair of non-slanted parts 53a and 53b extending along the front and back direction of the cassette holder 18, respectively, and the front and rear ends have a substantially doglegged shape. has been completed.

A first movable body 55 is provided on the upper surface of the upper plate portion 19 and is slidable in the front-rear direction, that is, in the insertion and ejection direction of the disk cassette 22. This first
The movable body 55 has a generally U-shape as a whole, and includes a pair of left and right sliding plate portions 56, 57, and a connecting plate portion 58 that interconnects the rear sides of the pair of sliding plate portions 56, 57. It consists of and a pair of sliding plate parts 5
Screw holes 59 are provided at the tips of the connectors 6 and 57 and at one end of the connecting plate 58, respectively. On the other hand, three guided pins 60 are slidably inserted into the three elongated holes 50 to 52 of the upper plate part 19 from below, and the upper ends of these three guided pins 60 The formed screws 60a are inserted and fixed into the three screw holes 59. Therefore, the first moving body 55
is slidable in the front-rear direction of the cassette holder 18 while being guided by three elongated holes 50-52.
Note that a spring locking portion 64 is provided at one end of the connecting plate portion 58.
A spring locking hole 65 is provided in the upper plate portion 25b of the connecting plate 25. A tension spring 66 is interposed between the spring locking portion 64 and the spring locking hole 65, and the first movable body 55 is always urged in the direction of ejecting the disk cassette 22 by the tension spring 66.

A second movable body 61 is provided on the connecting plate portion 58 and is slidable in the longitudinal direction thereof, that is, in a direction perpendicular to the insertion and ejection direction of the disk cassette 22. For details, as shown in Figures 2 and 3,
The connecting plate portion 58 is provided with a long hole 62 along its longitudinal direction, and the second movable body 61 is provided with a long hole 62 along its longitudinal direction.
A pair of left and right engaging portions 63 that engage with 2 are provided. Therefore, the second movable body 61 has its pair of engaging portions 63 guided through the elongated holes 62 while connecting the connecting plate portion 5.
8 in the longitudinal direction. Also the second
A screw hole 67 is provided at one end of the movable body 61, and a screw portion 68a of a guided pin 68, which is slidably inserted into the inclined guide groove 53 from below the upper plate portion 19, is inserted into the screw hole 67. Insertion is fixed. Therefore, when the first movable body 55 moves in the front-rear direction of the cassette holder 18, the guided pin 68 is guided by the inclined guide groove 53, and the second movable body 61 slides along the long hole 62. It's starting to move.

Then, as described later, the disk cassette 22
The sliding operation means of the sliding lid 70 is connected to the second moving body 61.
is made up of.

An L-shaped leaf spring 69 is attached to the substantially central portion of the second moving body 61. This leaf spring 69
The downwardly bent portion constitutes an engaging portion 69a, and this engaging portion 69a is connected to the cassette holder 18.
It protrudes below the upper plate part 9 from a notch 54 provided in the upper plate part 19 . Therefore, as will be described later, the engaging portion 69a engages with a recess 71 formed in the sliding lid 70 of the disk cassette 22.

A locking pin 73 is attached to the base end of the sliding plate portion 56 of the first moving body 55 by a support plate 72 . This locked pin 73 is attached to the side plate 1.
6, and a roller 74 is rotatably inserted into the locked pin 73. On the other hand, the side plate 16 is provided with an L-shaped cutout groove 75 into which the plate lock pin 73 is inserted.
Specifically, the cutout groove 75 includes a horizontal portion 75a and a vertical portion 75b extending vertically downward from the rear end of the horizontal portion 75a. When the first movable body 55 moves horizontally and the locked pin 73 comes to the rear end of the horizontal portion 75a,
The cassette holder 18 is moved downward together with the first moving body 55 by a tension spring 47. In FIGS. 2 to 4, reference numeral 76 denotes a first portion that contacts the left end portion 78 of the front wall of the disk cassette 22.
This protruding piece 76 of the movable body 55 projects downward from the upper plate part 19 of the cassette holder 18 through an elongated hole 77 formed in the upper plate part 19 in the front-rear direction.

An eject operation plate 80 is attached to the side plate 16 and is slidable in the front-rear direction. More specifically, as shown in FIGS. 2 and 5, guide holes 81 and 82 extending horizontally are formed at two locations in the front and rear of the side plate 16, and on the other hand, the eject operation plate 80 has holes formed in these guide holes 81 and 82, respectively. A pair of front and rear protrusions 83 and 84 that are slidably engaged are provided. Further, the side plate 16 is provided with a spring locking portion 85 that protrudes below the eject operation plate 80, while the rear end of the eject operation plate 80 is provided with a spring locking portion horizontally opposite to the spring locking portion 85. A section 86 is provided. A tension spring 87 is interposed between these spring locking parts 85 and 86, and the eject operation plate 80
is always biased forward. An inclined portion 88 and a stopper portion 89 are formed on the upper edge of the eject operation plate 80, respectively. This inclined portion 88
is for rotating the connecting plate 25 upward, and the inclined portion 88 is inclined downward toward the rear end side of the eject operation plate 80. A pressed pin 90 implanted and fixed to one side plate portion 25a of the connecting plate 25 projects above the inclined portion 88.
Further, the stopper portion 89 is located at the front end portion 75 of the notch groove 75.
c, and normally overlaps with the front end portion 755c as shown in FIG. 5, but when the eject operation plate 80 is moved forward as shown in FIG. 13, it overlaps with the horizontal portion 75a. It's summery. Therefore, when the first movable body 55 moves backward while the eject operation plate 80 is moving forward, the roller 74 of the locked pin 73 comes into contact with the stopper part 89, and the first movable body 55's return movement is now prevented. In addition, in FIGS. 1 to 5, 91 is a pressed portion of the eject operation plate 80.

The sliding plate portion 57 of the first movable body 55 has a slider extending between the side plate portion 21 of the cassette holder 18 and the side plate 17, as shown in FIGS. 2 to 4, FIGS. 7a and 7b. An L-shaped support plate portion 93 is provided. A cassette lock lever 95 is provided inside the lower end of this support plate portion 93 by a support shaft 94.
is rotatably supported in the vertical direction. This cassette lock lever 95 is always urged to rotate clockwise in FIGS. 7a and 7b by a tension spring 96. The cassette lock lever 95 has a pressed pin 97 at its front end and a lock pawl 98 at its rear end, as shown in FIGS. 7a and 7b. The pressed pin 97 projects horizontally toward the side plate 17. On the other hand, a vertical piece 99 is provided at the front end of the side plate 17.
A pressing inclined portion 100 is formed at 9 . When the first movable body 55 moves back, the pressed pin 97 is pressed against the pressing inclined portion 100 and rotates counterclockwise against the tension spring 96, as shown in FIG. 7a. It's summery. Further, the lock claw 98 protrudes upward, and locks the disk cassette 22 inserted into the cassette holder 18 and the first movable body 55.
It has become possible to lock the two together. 7a and 7b on one side of the lower wall of the disk cassette 22 supported by the side plate 21.
As shown in the figure, a lock hole 101 is provided, into which the lock pawl 98 is inserted. Note that the side plate portion 21 is formed with a cutout portion 102 extending in the front-rear direction so that the lock pawl 98 can be inserted therethrough.

(Description of structure of disk cassette) As shown in FIG. 3, the disk cassette 22 has a magnetic disk 115, which is a disk-shaped recording medium, rotatably housed in a flat cassette housing 107 made of synthetic resin. A disk-shaped core metal 108 is attached to the center of the magnetic disk 115. This core metal 108 is connected to the cassette housing 10.
It is rotatably fitted into a circular opening 109 provided in the lower wall of 7. An insertion hole 110 into which the rotating shaft 6a of the brushless motor 6 is inserted and a pin insertion hole 111 into which the rotation drive pin 8 is inserted are provided on the lower surface of the core metal 108, respectively.

A pad insertion hole 112 and a head insertion hole 1 are provided in the upper and lower walls of the front side of the cassette housing 107.
13 are provided respectively. When the disk cassette 22 is installed, the magnetic head 13 is inserted into the head insertion hole 113, and a pad (not shown) is inserted into the pad insertion hole 112 so that the recording/reproducing surface of the magnetic disk 108 comes into contact with the magnetic head 13. It's getting old. The above pad insertion hole 112
and the head insertion hole 113 in the cassette housing 107.
A sliding lid 70 with a U-shaped cross section that sandwiches the front side of the
It is always covered by The sliding lid 70 is slidable along the front side surface 107a of the cassette housing 407 in the directions of arrows a and b in FIG. A pair of communication holes 114 are provided. Then, when the sliding lid 70 is slid in the direction of arrow a in FIG.
This pair of communication holes 114 are connected to the pad insertion hole 11.
These insertion holes 112 and 113 are opened in alignment with the head insertion hole 113 and the head insertion hole 113. Further, the front end 70a of the sliding lid 70 facing the side surface 107a of the cassette housing 107 has a notch in which an engaging portion 69a of a leaf spring 69 attached to the second movable body 61, which is a sliding operation means, engages. A recessed portion 71 is provided. Furthermore, cassette housing 1
A lock hole 101 into which the lock pawl 98 of the cassette lock lever 95 is inserted is provided in one side of the lower wall of the cassette lock lever 95, as described above.

(Description of Operation) Next, the loading and unloading operations of the disk cassette 22 in the recording/reproducing apparatus 1 configured as described above will be explained.

(Mounting operation) Before inserting the disk cassette 22 into the cassette holder 18, the first moving body 55 and the second moving body 61 are in the return position shown in FIG. The screw 68 of 61 is located at the front end of the inclined guide groove 53, that is, at the non-inclined portion 53a. When the disk cassette 22 is inserted from this state into the cassette holder 18 from the direction of arrow c in FIG.
The concave portion 71 of the sliding lid 70 contacts the leaf spring 6 of the second moving body 61.
It engages with the engaging portion 69a of No.9. At this time, since the first movable body 55 has not yet started forward movement, the pressed pin 97 of the cassette lock lever 95 is pressed by the pressing inclined portion 100 and is in the rotation position shown in FIGS. 6 and 7a. , the lock pawl 98 is located below the notch 102 of the cassette holder 18. Therefore, the disk cassette 22 and the first moving body 55 are not yet locked together.

However, when the disk cassette 22 is further inserted in the direction of the arrow c in FIG. Begin to. Therefore, the cassette lock lever 95 is rotated clockwise by the tension spring 96 as shown in FIG. 7b. Then, the lock pawl 98 is inserted into the lock hole 101 of the disk cassette 22 through the notch 102, and the disk cassette 22 and the first moving body 55 are locked together. Note that the guided pin 68 of the second movable body 61 moves on the non-slanted portion 53a until this locked state is reached. Therefore, until the lock state is reached, the second movable body 61 does not move in the sliding direction of the sliding lid 70 (in the directions of arrows a and b), and the engaging portion 69a of the leaf spring 69 and the sliding lid 70 is surely engaged with the recess 71.

Thereafter, when the disk cassette 22 is inserted in the direction of arrow c as shown in FIGS. 8 and 9, the guided pin of the second movable body 61 moves in the same direction as the first movable body 55 68 is the inclined guide groove 53
The second moving body 61 is guided by the arrow d in FIG.
move in a direction. Therefore, when the sliding lid 70 moves forward in the direction of arrow a in FIG. 9 and the guided pin 68 reaches the non-slanted portion 53b, the pair of communication holes 114 of the sliding lid 70, the pad insertion hole 112, The head insertion holes 113 are aligned with each other, and these insertion holes 11
2,113 is completely opened as shown in FIG. Immediately after this open state is reached, the roller 74 of the locked pin 73 of the first movable body 55 reaches the vertical portion 75b of the notched groove 75. Therefore, the connecting plate 25 is rotated clockwise by the tension spring 47 as shown in FIG.
As shown in the figure and FIG. 12, it moves downward while remaining in a horizontal state. Then, insert the brushless motor 6 into the insertion hole 40 and pin insertion hole 41 of the disk cassette 22.
The rotating shaft 6a and rotation drive pin 8 are inserted, and the magnetic head 13 is inserted into the head insertion hole 113.
Pads (not shown) are inserted into the pad insertion holes 112 through the notches 54, and the disk cassette 2
The second mounting operation is completed. At this time, the locked pin 73 of the first movable body 55 enters the vertical portion 75b of the notched groove 75 and is locked.

Although the sliding lid 70 is opened as described above,
Even if the sliding lid 70 is not completely closed when inserting the disk cassette 22 into the cassette holder 18, there is no problem in the opening operation of the sliding lid 70. That is, the second moving body 61 is the sliding lid 70
Since the moving stroke is equal to the opening/closing stroke of engage with. Therefore, malfunctions such as when the disk cassette 22 is mounted at the cassette mounting position without the sliding lid 70 being completely opened will not occur.

Also, the disk cassette 22 and the first moving body 5
5 are integrally locked by the cassette lock lever 95, so even if the disk cassette 22 is suddenly pulled out while it is being inserted into the cassette holder 18, the plate springs will not be removed from the recess 71 of the sliding lid 70. The engaging portion 69a of the sliding cover 69 will not come off, and therefore, there will be no mistake in opening or closing the sliding lid 70.

(Ejecting Operation) The ejecting operation (ejecting operation) of the disk cassette 22 is performed by moving the eject operation plate 80 forward in the direction of arrow e in FIG. That is, when the pressed portion 91 of the eject operation plate 80 is pressed against the tension spring 87 and moved in the direction of arrow e in FIG. 11, the inclined portion 88 pushes the pressed pin 90 of the connecting plate 25 upward. When pressed, the connecting plate 25 rotates counterclockwise in FIG. 11 against the tension spring 47. Therefore, the cassette holder 18 moves upward while remaining in a horizontal state, and the locked pin 73 moves to the vertical part 7.
5b and becomes unlocked. Yotsutte 1st
The movable body 55 moves back together with the disk cassette 22 in the direction of the arrow h in FIG. 9 by the tension spring 66. At this time, the guided pin 68 of the second movable body 61 is guided by the inclined guide groove 53, and the second movable body 61 moves back in the direction of the arrow i in FIG. Therefore, the sliding lid 70 slides in the direction of arrow b in FIG.
2 and the head insertion hole 113 are covered by a sliding lid 70.

Next, FIG. 13 shows a state immediately before the first movable body 55 completes its backward movement, and the eject operation plate 80 is maintained at the forward movement position until this time. Then, the locked pin 73 that has been guided by the horizontal portion 75a and has moved back comes into contact with the stopper portion 89 of the eject operation plate 80 before coming into contact with the front end portion 75c, and the backward movement of the first movable body 55 is temporarily stopped. thwarted. Therefore, when the first moving body 55 is stopped, the disk cassette 22 is moved to the first moving body 55 by the cassette lock lever 95.
Since the disk cassette 22 remains locked, the disk cassette 22 will not fly out of the cassette holder 18 due to inertial force in the direction of the arrow h in FIG.

Next, when the pressure on the pressed portion 91 of the eject operation plate 80 is released, the eject operation plate 80 and the first movable body 55 are moved back as shown in FIG. 5 by the tension springs 87 and 66, respectively. Then, the pressed pin 97 of the cassette lock lever 95 rides on the pressing slope 100, and the cassette lock lever 95
rotates counterclockwise as shown in Figure 7a,
The lock pawl 98 comes off from the lock hole 101 of P22. However, the backward movement speed of the first moving body 55 to the disk cassette 22 at this time is determined by the tension spring 66.
The speed is extremely low because the tensile force is weakening.
Therefore, even if the engagement between the lock pawl 98 and the lock hole 101 is released, there is no fear that the disk cassette 22 will fly out of the cassette holder 18.

Next, a modified example of the cassette loading device will be described in the 14th example.
This will be explained based on the diagram. In this modified embodiment, four rollers 120 to 123 are freely rotatable at four locations on the front, back, left, and right on the first moving body 55, as shown in FIG. 14, without employing the inclined guide groove 53 shown in the above embodiment. It is installed. An endless driving thread 124 is wound around these rollers 120 to 123 in a rectangular shape.
The driving thread 124a between the two and the second movable body 61 are connected to each other by a pair of fasteners 125. Further, a long hole 126 is formed in the first moving body 55 along a straight line connecting the rollers 120 and 123, and a tip 127a of a stopper 127 fixed to the upper plate portion 19 of the cassette holder 18 is inserted into the long hole 126. is inserted. The roller 1 is attached to this tip 127a.
The drive thread 124b between threads 20 and 123 is fixed.

Therefore, when the disk cassette 22 is inserted in the direction of the arrow c in FIG.
is relatively driven in the direction of arrow j in FIG. 14 at the tip 127a. Therefore, the second moving body 61 and the sliding lid 70 move forward in the direction of the arrow d and the direction of the arrow a in FIG. 14, respectively, and the sliding lid 70 opens. Further, when the first movable body 55 moves back together with the disk cassette 22 in the direction of the arrow h in FIG.
b is relatively driven in the direction of arrow k in FIG. Therefore, the second movable body 61 and the sliding lid 70 move back in the directions of arrows i and b, respectively, in FIG. 14, and the sliding lid 70 closes.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment and can be modified in various ways.

〔Effect of the invention〕

As described above, according to the disk cassette of the present invention, when the disk cassette is inserted into and/or ejected from the recording/reproducing apparatus, the sliding operation means provided on the recording/reproducing apparatus can be used to Since the sliding lid can be opened and/or closed automatically and easily using the notch, there is no need to manually open and close the sliding lid as with conventional disk cassettes. Therefore, the disk cassette can be quickly attached to the recording/reproducing device, and erroneous operation such as attaching the disk cassette with the sliding cover closed can be reliably prevented. In addition, when the disk cassette is removed from the recording/playback device, the sliding lid is always closed, so there is a risk that your hands, etc. may touch the recording/playback surface of the disk-shaped recording medium and accidentally damage it. Not at all.

Moreover, the engaging part of the sliding lid with respect to the sliding operation means is configured as a notch rather than a protrusion, so that when the disk cassette is not in use, it can be easily pulled against other objects unlike when the engaging part is a protrusion. Since the risk of the sliding lid being accidentally opened is reduced, the sliding lid is difficult to be opened when the disk cassette is not in use, resulting in very high safety.

However, since the sliding lid with a U-shaped cross section is attached to the outside of the side and top and bottom surfaces of the cassette housing, it is easy to attach the sliding lid to the cassette housing.
A low-cost disk cassette can be obtained. Since the sliding lid has a U-shaped cross section, a notch for sliding operation can be easily formed at the front end of the sliding lid facing the side surface of the cassette housing. Very convenient to open and close.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view showing a recording/reproducing device separated into the main body and a cassette mounting device, and Fig. 2 is an exploded perspective view of the cassette mounting device. 3 is a plan view of the cassette loading device and the disk cassette, FIG.
6 is a left side view of FIG. 4 in the initial state when the disk cassette is inserted into the cassette holder, and FIG. 7a is an enlarged view showing the main parts of the same.
FIG. 7b is an explanatory diagram showing a state immediately after the disk cassette is locked, FIG. 8 is an explanatory diagram showing a state in which the disc cassette of FIG. 6 is installed,
FIG. 9 is an explanatory diagram showing a state in which the disk cassette shown in FIG. 3 is being inserted, FIG.
Figure 1 is a side view taken along the line XI-XI of Figure 10, Figure 12 is a side view taken along the line XII-XII of Figure 10, and Figure 13 is a side view taken along the line
FIG. 14 is an explanatory view showing a state in which the eject operation plate is activated, and FIG. 14 is a plan view showing a modification of the cassette mounting device. Also, in the symbols used in the drawings, 22...
Disk cassette, 61... second moving body (sliding operation means), 70... sliding lid, 71... recess (notch), 107... cassette housing, 107a...
Side surface of cassette housing, 112... Pad insertion hole (opening), 113... Head insertion hole (opening), 11
5... Magnetic disk (disc-shaped recording medium).

Claims (1)

[Scope of Claims] 1. A flat cassette housing made of synthetic resin in which a disk-shaped recording medium is rotatably housed, and a flat cassette housing formed on at least one of the upper and lower surfaces of the cassette housing so that the disk-shaped recording medium can be used during recording and reproduction. an aperture that exposes a part of the cassette to the outside; and a sliding member having a U-shaped cross section that is overlapped on the outside of the side and upper and lower surfaces of the cassette housing and that slides along these side and upper and lower surfaces to open and close the aperture. A disk cassette comprising: a movable lid; and a notch for sliding operation of the sliding lid formed at a front end of the sliding lid facing a side surface of the cassette housing.