JPH07220431A - Disk cartridge - Google Patents

Abstract

PURPOSE:To reduce an insertion resistance into a cassette holder with simple structure by providing a convex surface part to be brought into pressure contact with a pushing member on a cassette holder side within the cassette holder in the upper surface of a case. CONSTITUTION:When a disk cassette DK is inserted, it is inserted almost without receiving the load except that a convex part 9a on the inserted front side of the cassette DK-comes into contact with the pushing member 35b of a cassette holder 30. The respective convex parts 9a to 9c are first brought into contact with the respective pushing member 53a to 53c slightly on this side of an installation position to receive a load, but since the cassette DK is moved at a sufficient speed by the automatic drawing operation of an automatic infection mechanism E, the cassette DK is smoothly inserted. Therefore, with simple structure that merely the convex parts 9a to 9c are provided, a load at the time of inserting the cassette DK into the cassette holder 30 can be reduced, thereby being able to ensure the smooth insertion of the cassette DK.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc cassette, and more particularly to a disc cassette suitable for use in a disc drive device having an auto-injection function.

[0002]

2. Description of the Related Art A conventional disc cassette is shown in FIGS. In FIGS. 17 and 18, this disk cassette DK is for magneto-optical recording, and a disk-shaped magneto-optical disk 2 (disk) is rotatably housed in a case 1 having an eccentric shape. A hub 3 is fixed to the center of the magneto-optical disk 2, and the turntable of the disk drive device is attached to the hub 3.

The case 1 comprises an upper half member 1a and a lower half member 1b, and the upper half member 1a and the lower half member 1b are joined together in a butted state. Openings 4 are formed at the opposing positions of the upper half member 1a and the lower half member 1b. A part of the magneto-optical disk 2 is exposed from the opening 4 of the upper half member 1a, and the opening 4 of the lower half member 1b is larger than that of the upper half member 1a. Is partially exposed and the hub 3 is exposed.

A shutter 5 is slidably provided in the case 1 in the direction of the arrow in FIGS. 17 and 18, and both openings 4 are opened and closed by the shutter 5. One end of a torsion coil spring (not shown) is hooked on the shutter 5, and the shutter 5 is biased toward the closed position by the spring force of the torsion coil spring. A bridge portion 5a is provided so as to project from the shutter 5, and the bridge portion 5a is arranged along the insertion front end face 1c of the case 1.

Positioning grooves 6 are formed at symmetrical positions on the rear end side of the lower half member b on the rear side of the cassette insertion, and the positioning pins of the disk drive device are inserted into the pair of positioning grooves 6 to insert the disk into the disk. The cassette is positioned. Further, an erroneous erasure prevention member 7 is slidably provided in the hole of the case 1 on the rear end side of the cassette insertion, and whether or not writing is possible is selected by the position of the erroneous erasure prevention member 7. Further, pull-in grooves 8 are formed at symmetrical positions on the front end side of the cassette 1 of the case 1.

On the other hand, a disk cassette device is shown in FIGS. 19 and 20. 19 and 20, a slide plate 11 is slidably arranged on the chassis 10 in the directions of arrows A and A ', and is displaced between an unrotating position and a loading position. One end of a coil spring 13 is hooked on the slide plate 11, and the spring force biases the slide plate 11 toward the loading position (direction of arrow A).

The elevating plate body 17 is arranged so as to be movable up and down with respect to the chassis 10, and the elevating plate body 17 is guided by the inclined groove 11a of the slide plate 11 and moved up and down. The lifting plate 17 has a spindle motor 19
The turntable 20 is fixed, and a pair of left and right positioning pins 52 are provided upright.

The cassette holder 30 is fixed to the chassis 10 while being placed on the upper surface of the reference receiving surface 10a of the chassis 10. The cassette holder 30 includes an upper surface portion 30a, a lower surface portion 30b, and left and right side surface portions 30c, and the disk cassette DK is enclosed in an internal space surrounded by these.
Can be inserted and removed freely. An auto-injection mechanism E and a slide plate lock mechanism F are provided on the lower surface side of the lower surface portion 30b of the cassette holder 30.

The auto-injection mechanism E has a first injection plate 36, and the first injection plate 36 is provided so as to be movable in the A and A'arrow directions with respect to the cassette holder 30. The second injector plate 39 is rotatably provided in the directions of arrows B and B ′ with the rotation support shaft 38 of the first injector plate 36 as a fulcrum. The support pin 37 of the cassette holder 30 is inserted into the cam groove 40 of the second inject plate 39, and the cassette pull-in pin 41 is provided in the second inject plate 39. The third injector plate 42 is rotatably provided in the directions of arrows C and C ′ with the support shaft 43 of the cassette holder 30 as a fulcrum, and one end thereof is locked to the first injector plate 36. A hold pin 44 is provided on the other end of the third injector plate 42. One end of a coil spring 46 is hooked on the third inject plate 42, and the third inject plate 42 is biased in the C arrow rotation direction. When the slide plate 11 is located at the unloading position, the slide plate 11
The injector holding piece 45 is locked to the hold pin 44 of the third injector plate 42, and the rotation of the third injector plate 42 is restricted.

The slide plate lock mechanism F has a lock claw plate 47, and the lock claw plate 47 is fixed to the lower surface portion 30b of the cassette holder 30.
It is provided so as to be rotatable in the directions of arrows D and D'in FIG. One end of a torsion coil spring (not shown) is hooked on the lock claw plate 47, and the lock claw plate 47 is biased in the direction of the arrow D by this spring force. Further, the release lever portion 5 is provided on the lock claw plate 47.
1 is provided. Then, the lock claw plate 47 engages with the lock pin 50 of the slide plate 11 to lock the slide plate 11 at the unloading position.

The upper surface portion 30a of the cassette holder 30
Are provided with leaf spring-shaped pressing members 53a to 53c at three positions. The pressing members 53a to 53c are the cassette holder 3
The disk cassette DK in 0 is pressed downward.

In FIGS. 19 and 20, A is an auto eject mechanism, B is a disk rotating mechanism, C is a head mechanism, and D is a mechanism.
Is a shutter opening / closing mechanism, and G is a cassette positioning mechanism.

Next, the operation of the above configuration will be described. The lock pin 50 of the slide plate 11 is positioned at the unloading position by being locked by the lock claw plate 47, and the injector holding piece 45 of the slide plate 11 is engaged with the hold pin 44 of the third injector plate 47. Then, the rotation of the third injector plate 42 is stopped, and the cassette pull-in pin 41 is positioned at the standby position.

When the disc cassette DK is inserted into the cassette holder 30 in this state, first the insertion front end face 1c of the disc cassette DK pushes the shutter opening pin 34,
The shutter opening pin 34 moves along the cam hole 33 against the spring force of the torsion coil spring 35 to open the shutter 5. Further, when the disc cassette DK is inserted into the cassette holder 30, the insertion front end face 1c of the disc cassette DK pushes the release lever portion 51, and the lock claw plate 47 resists the spring force of the torsion coil spring 49 and the D'arrow. Rotate in the direction.

When the lock claw plate 47 is disengaged from the lock pin 50, the slide plate 11 moves in the direction of the arrow A '(loading position side) by the spring force of the coil spring 13, and this movement causes the third injector plate 42 to move.
Is rotated in the direction of arrow C by the spring force of the coil spring 46. The rotation of the third injector plate 42 causes the first injector plate 36 to move in the direction of the arrow A'and the second injector plate 36 to rotate in the direction of the arrow B, so that the cassette pull-in pin 41 is moved to the disc cassette. Enter the groove 8 for drawing in the DK. Further, when the first inject plate 36 moves in the direction of arrow A, the cassette pull-in pin 41 pushes the case 1, and the disc cassette DK is automatically pulled into the cassette holder 30. Then, the insertion front end face 1c of the disc cassette DK is inserted to a position where it abuts on the cassette stopper portion 32, and the disc cassette DK is positioned at the mounting position.

On the other hand, the slide plate 12 continues to slide even after the disc cassette DK is positioned at the mounting position, and the elevating plate body 17 moves from the lowered position of FIG.
And is displaced to the raised position of FIG. Then, the turntable 20 attracts the hub 3 of the disc cassette DK,
The rotation of the spindle motor 19 causes the magneto-optical disk 2 to rotate.
Is made rotatable and a pair of positioning pins 52
Is inserted into the positioning groove 6 of the disc cassette DK. As shown in FIGS. 22 and 23, the case 1 of the disk cassette DK is positioned in the height direction and positioned by pressing the case 1 against the lower surface portion 30b of the cassette holder 30 by the pressing force of the pressing members 53a to 53c. The pin 52 is inserted into the positioning groove 6 for horizontal positioning.

[0017]

However, according to the above-mentioned conventional example, as shown in FIGS. 21 and 22, the lower surface portion 30b of the cassette holder 30 and the pressing members 53a to 53c.
The dimension L _{4 from the} front end surface of the disc cassette is set smaller than the thickness L _{1 of the} disc cassette DK. Therefore, when the disc cassette DK is inserted, the disc cassette DK must always be inserted against the frictional force of the pressing members 53a to 53c, which causes a large load on the auto-injection mechanism or is worn by the disc cassette DK. There was a problem that occurs. Here, the pressing members 53a-5
3c is configured as a mechanism capable of moving up and down, and only when the disc cassette DK is located at the mounting position, the pressing members 53a to
It is possible to press the disk cassette DK with 53c, but this is not practical because the mechanism becomes complicated.

Therefore, the present invention has a simple structure and
An object of the present invention is to provide a disk cassette that can be inserted into a cassette holder without receiving a load from a pressing member as much as possible.

[0019]

A disk cassette according to the present invention for achieving the above object is inserted into a cassette holder and positioned at a mounting position. At this mounting position, a case is formed by a pressing member on the side of the cassette holder. In the disc cassette to be pressed downward, a projecting surface portion is provided on the upper surface of the case at a position facing the pressing member at the mounting position, and only the projecting surface portion is in pressure contact with the pressing member. .

[0020]

When the disc cassette is inserted into the cassette holder, the disc cassette is smoothly inserted because it does not come into pressure contact with the pressing member except the projecting surface portion of the disc cassette, and the projecting surface portion comes into pressure contact with the pressing member only at the mounting position at the insertion completion position. Therefore, a load is applied from the pressing member immediately before the completion of insertion, and smooth insertion is not hindered.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 13 show a first embodiment of the present invention. FIG. 1 shows a perspective view of the disc cassette viewed from the upper side. In FIG. 1, the disc cassette DK has substantially the same configuration as that of the conventional example, and therefore, the same components are designated by the same reference numerals in the drawing, and the description thereof will be omitted. Only different components will be described. That is, case 1
The upper surface of the projecting surface is provided with projecting surface portions 9a to 9c at three positions higher than the other surfaces, and each of the projecting surface portions 9a to 9c is located at a mounting position in the cassette holder 30 and each pressing member 53a to 53c described below is provided. It is arranged at a position facing. Each of the projecting surface portions 9a to 9c is preferably made of a member having high wear resistance, and may be formed integrally with the upper case member 1a.

FIG. 2 is an exploded perspective view of the disk drive device, and FIG. 3 is an exploded perspective view of the disk drive device further disassembled without the cassette holder and the like. 2 and 3, the chassis 10 is formed of a highly rigid member (for example, aluminum die cast),
A slide plate 11 is arranged on the chassis 10. The slide plate 11 is guided by the guide pins 12 of the chassis 10 and slides in the directions of arrows A and A ', and is displaced between the unloading position of FIG. 7 and the loading position of FIG. One end of a coil spring 13 is hooked on the slide plate 11, and the spring force biases the slide plate 11 toward the loading position (direction of arrow A).

The auto-eject mechanism A has an eject motor 14 arranged on the chassis 10, and the output gear 15 is rotated by this driving force. The output gear 15 is provided with a locking pin 15a, and the locking pin 15a is locked to the bent claw portion 16 (shown in FIG. 3) of the slide plate 11 only for a predetermined rotation angle section, so that the slide plate 11 is moved from the loading position to the unloading position against the spring force of the coil spring 13.

The disk rotating mechanism B has an elevating plate body 17 arranged on the chassis 10, and the elevating plate body 17 is provided so as to be vertically guided by a guide block body 18. A guide pin 17a is provided on the elevating plate body 17, and the guide pin 17a is engaged with the inclined groove 11a of the slide plate 11. The elevating plate body 17 is located in the lowered position at the unloading position of the slide plate 11 and is located in the raised position at the loading position. A spindle motor 19 is provided on the lower surface side of the elevating plate body 17, and a turntable 20 that is rotated by the drive of the spindle motor 19 is provided on the upper surface side of the elevating plate body 17. When the turntable 20 is in the ascending position, the magneto-optical disk 2 is generated by magnetic force.
Adsorb the hub 3 of.

The head mechanism C has a head carriage 24 arranged on the chassis 10, and the head carriage 24 is slidable along the pair of guide rails 25 in the directions of arrows A and A '. A pair of left and right linear motors 26 are arranged on both sides of the head carriage 24, and a sliding force is applied to the head carriage 24 by the linear motors 26. The magnetic head 2 is provided above the head carriage 24 via an arm portion 27.
8 are provided. An optical head 29 is provided at the position of the head carriage 24 facing the magnetic head 28, and the magneto-optical disk 2 of the disk cassette DK located at the mounting position is located between the two heads 28, 29. Magneto-optical recording / reproduction is performed on the magneto-optical disk 2 by the interaction between the two heads 28 and 29.

The cassette holder 30 is formed by bending one plate, and is composed of an upper surface portion 30a, a lower surface portion 30b, and left and right side surface portions 30c, and the disc cassette DK is inserted into and removed from the space surrounded by these. It The cassette holder 30 is fixed to the chassis 10 while being placed on the reference surfaces 10a formed on the left and right ends of the chassis 10. A large notch (not shown) for entering the turntable 20, the optical head 29, etc. is formed in the lower surface portion 30b, and the magnetic head 28 is also formed in the upper surface portion 30a.
A cutout portion 31 is formed for the entry. Further, the upper surface portion 30a is provided with a cassette stopper portion 32, and the position where the disc cassette DK contacts the cassette stopper portion 32 is the mounting position. The cassette holder 30 is provided with a shutter opening / closing mechanism D, an auto eject mechanism E, and a slide plate lock mechanism F.

As shown in detail in FIG. 4, the shutter opening / closing mechanism D engages with the cam hole 33 formed in the upper surface portion 30a of the cassette holder 30, the cam hole 33, and along the cam hole 33. It is composed of a movable shutter opening pin 34 and a torsion coil spring 35 hung between the shutter opening pin 34 and the upper surface portion 30a. The shutter opening pin 34 is biased toward the starting end position (position in FIG. 4) by the spring force of the torsion coil spring 35.

As shown in detail in FIG. 4, the auto-injection mechanism E has a first injector plate 36 arranged on the lower surface side of the lower surface 30b of the cassette holder 30, and the first injector plate 36 is provided. 36 is the lower surface 30
It is provided slidably in the directions of arrows A and A'in FIG. A rotation support shaft 38 is fixed to one end side of the first injection plate 36, and a second injection plate 39 is rotatably provided on the rotation support shaft 38. A cam groove 40 is formed in the second injector plate 39, and the guide pin 37 is inserted in the cam groove 40.
Further, a cassette pull-in pin 41 is erected on the second inject plate 39, and the cassette pull-in pin 41 is rotated in the directions of arrows B and B ′ in FIG. 4 by the rotation of the second inject plate 39.

The third injector plate 42 is rotatably provided in the directions of arrows C and C'in FIG. 4 with the support shaft 43 of the lower surface portion 30b as a fulcrum, and one end thereof is the other end of the first injector plate 36. Is locked to. A hold pin 44 is provided at the other end of the third injector plate 42, and the hold pin 44 is disengaged from the injector holding piece 45 of the slide plate 11. One end of a coil spring 46 is hooked on the third injector plate 42, and the spring force biases the third injector plate 42 in the direction of the arrow C.

The slide plate lock mechanism F has a lock claw plate 47, and the lock claw plate 47 is supported rotatably in the directions of arrows D and D'with a support shaft 48 of the chassis 10 as a fulcrum. This lock claw plate 4
7 is biased in the direction of the arrow D by the spring force of the torsion coil spring 49, and is disengaged from the lock pin 50 of the slide plate 11. Further, the lock claw plate 47 is provided with a release lever portion 51.

On the other hand, the cassette positioning mechanism G has a pair of left and right positioning pins 52 which are erected on the elevating plate body 17, and the pair of positioning pins 52 of the disc cassette DK is at the ascending position of the elevating plate body 17. It is inserted into each of the pair of positioning grooves 6. In addition, pressing members 5 provided at three positions on the upper surface portion 30a of the cassette holder 30.
3a to 53c, and each of the pressing members 53a to 53c is composed of a leaf spring. One end side of this leaf spring is fixed to the upper surface portion 30 a, and the tip end side thereof projects into the cassette holder 30. Further, as shown in detail in FIGS. 6A and 6B, there is a sphere 54 arranged in the groove 10b near each reference surface 10a of the chassis 10, and each sphere 54 is slightly lower than the center. The side is buried in the groove 10b. The upper surface side of each sphere 54 is arranged in each hole 55 formed in the lower surface portion 30b of the cassette holder 30, and the diameter of each hole 55 is formed smaller than the diameter of the sphere 54 so that each sphere 54 has a groove 10b.
It is configured to rotate freely without falling off. or,
The upper end of each sphere 54 is configured to always project upward regardless of the dimensional error of the lower surface portion 30b, and the disc cassette DK inserted in the cassette holder 30 has each sphere 54
Will be placed on top. Therefore, the upper end of the sphere 54 becomes the case reference surface n for the case 1. The dimension between the case reference surface n and the tip ends of the pressing members 53a to 53c is L, and the case 1 of the disc cassette DK is
Has a thickness of L ₁ , and the projecting surface portion 9a of the disc cassette DK
When the thickness of the casing 1, including ~9c and L _2, L ₁
The relationship of <L <L ₂ is set.

Next, the operation of the above configuration will be described. The lock pin 50 of the slide plate 11 is positioned at the unloading position with the lock pin 50 being locked by the lock claw plate 47, and the slide plate 1 is at the unloading position.
The eject holding piece 45 of No. 1 is locked to the hold pin 44 of the third eject plate 42, and the cassette pull-in pin 41 is positioned at the standby position (state of FIG. 7).

When the disc cassette DK is inserted into the cassette holder 30 in this state, as shown in FIG. 7, the insertion front end face 1c of the disc cassette DK first pushes the shutter opening pin 34, and the shutter opening pin 34 twists. The shutter 5 is opened by moving along the cam hole 33 against the spring force of the coil spring 35. Furthermore, the disc cassette D
When K is inserted into the cassette holder 30, as shown in FIG. 8, the insertion front end face 1c of the disc cassette DK pushes the release lever portion 51, and the lock claw plate 47 resists the spring force of the torsion coil spring 49 to D. ′ The disc cassette DK is allowed to be inserted by rotating in the direction of the arrow. And in FIG.
As shown in FIG. 7, when the lock pin 50 is about to be unlocked, the cassette pull-in pin 41 is located at the entrance of the pull-in groove 8 of the disc cassette DK. As shown in FIG. 10, when the lock pin 50 is unlocked, the slide plate 11 slides in the direction of the arrow A (loading position), and this slide releases the restriction on the hold pin 44, so that the third injector plate is released. 42 rotates in the direction of arrow C. This third injector plate 42
Rotation of the first inject plate 36 causes the first inject plate 36 to slide in the direction of the arrow A'and the second inject plate 3
9 rotates in the direction of arrow B, and the cassette pull-in pin 41 enters the pull-in groove 5 of the disc cassette DK. In this state, the first injector plate 36 is further slid in the direction of arrow A so that the disc cassette DK
Is automatically drawn into the interior of the cassette holder 30, and as shown in FIG.

At the time of inserting the disc cassette DK, the disc cassette DK receives almost no load except that the projecting surface portion 9a on the insertion front side of the disc cassette DK comes into contact with the pressing member 53b of the cassette holder 30. Is inserted. Rather, the disc cassette D
The lower surface of the case 1 of K is the lower surface portion 30b of the cassette holder 30.
The disc cassette D is placed on the more protruding ball 54.
Since the ball 54 rotates with the movement of K, it is inserted very smoothly. The projecting surface portions 9a to 9c come into contact with the pressing members 53a to 53c and receive a load only shortly before the mounting position. Therefore, even a weak retraction force can be fully retracted. Rather,
Since the load from each pressing member 53a to 53c fulfills the damper function, it is possible to prevent the disc cassette DK from colliding strongly with the cassette stopper portion 32.

On the other hand, the slide plate 11 continues to slide after the disc cassette DK is pulled into the mounting position, and the slide plate 11 is displaced to the raised position by this slide. Then, as shown in FIGS. 12 and 13, the turntable 20 is connected to the hub 3 of the magneto-optical disk 2.
And the spindle motor 19 is driven to make the magneto-optical disk 2 rotatable. Further, the pair of positioning pins 52 is inserted into the positioning groove 6 of the disc cassette DK. The disk cassette DK includes pressing members 53a to
The lower surface of the case 1 is pressed against the four balls 54 by the pressing force of 53c for positioning in the height direction, and the positioning pin 52 is inserted into the positioning groove 6 for positioning in the horizontal direction. Done.

Here, the magneto-optical disk 2 of the disk cassette DK is positioned in the height direction at the height H ₁ of the upper surface of the turntable 20 with respect to the reference surface m, and the case 1 of the disk cassette DK has the reference surface m. On the other hand, the positioning in the height direction is performed at the height H ₂ of the upper surface of the sphere 54 (case reference surface n). Then, the height H ₁ from the reference surface m to the upper surface of the turntable 20 can be set very accurately as compared with the conventional case,
The height H ₂ from the reference plane m to the upper surface of the sphere 54 is also the sphere 54.
It can be accurately set because it can be formed with high dimensional accuracy. Therefore, it is possible to reduce the cost by using the sphere 54 to set the relative height between the magneto-optical disk 2 and the case 1 within an allowable error range.

13 to 16 show a second embodiment of the present invention. In the second embodiment, a roller 56 is used instead of the ball 54 of the first embodiment. That is, as shown in detail in FIGS. 16 (a) and 16 (b), the roller 56 is composed of a cylindrical portion 56 a and a shaft portion 56 b projecting to both sides thereof as an integral member.
Is rotatably housed in the groove 10c with the lower surface side buried. Further, the upper end surface of the columnar portion 56a is configured to slightly project from the hole 57 of the lower surface portion 30b of the cassette holder 30. Since other configurations are similar to those of the first embodiment, the same reference numerals are given to the drawings and the description thereof will be omitted.

In each of the above embodiments, the pressing member 53
If the positions of a and the pressing member 53b are shifted with respect to the cassette insertion direction, the front surface 9a of the disk cassette DK does not contact the pressing member 53b, so that the disk cassette DK can be inserted more smoothly.

Also in the second embodiment, the same operation and effect as in the first embodiment can be obtained.

In each of the above embodiments, the disk cassette DK is for magneto-optical recording, but the present invention is also applicable to magnetic recording or optical recording.

[0041]

As described above, according to the present invention, since the projecting surface portion which presses the pressing member on the cassette holder side at the mounting position in the cassette holder is provided on the upper surface of the case, it is easy to simply provide the projecting surface portion. With such a configuration, the load at the time of insertion into the cassette holder can be reduced, and smooth insertion can be guaranteed.

[Brief description of drawings]

FIG. 1 is a perspective view of a disc cassette as viewed from the top side (first embodiment).

FIG. 2 is an exploded perspective view of a disk drive device (first embodiment).

FIG. 3 is an exploded perspective view of a disk drive device in which a cassette holder and the like are omitted (first embodiment).

FIG. 4 is a perspective view of a cassette holder side and a slide plate (first embodiment).

FIG. 5 is an enlarged transverse cross-sectional view of a main part of the disk drive device (first embodiment).

FIG. 6A is a perspective view of a main part of a cassette positioning mechanism,
FIG. 3B is a sectional view of a main part of the cassette positioning mechanism (first embodiment).

FIG. 7 is a plan view of a main part (first embodiment) showing a process of inserting a disc cassette.

FIG. 8 is a plan view of the main parts (first embodiment) showing the process of inserting the disc cassette.

FIG. 9 is a plan view of a main part showing the insertion process of the disc cassette (first embodiment).

FIG. 10 is a plan view of a main part (first embodiment) showing a process of inserting the disc cassette.

FIG. 11 is a plan view of a main part showing the insertion process of the disc cassette (first embodiment).

FIG. 12 is an enlarged vertical sectional view of a main part showing a mounted state of a disc cassette (first embodiment).

FIG. 13 is an enlarged transverse cross-sectional view of a main part showing a mounted state of a disc cassette (first embodiment).

FIG. 14 is an exploded perspective view of a disk drive device (second embodiment).

FIG. 15 is an exploded perspective view of a disk drive device in which a cassette holder and the like are omitted (second embodiment).

16A is a perspective view of a main part of a cassette positioning mechanism, and FIG. 16B is a sectional view of a main part of the cassette positioning mechanism (second).
Example).

FIG. 17 is a perspective view of a disc cassette as viewed from the top side (conventional example).

FIG. 18 is a perspective view of a disc cassette as seen from the lower surface side (conventional example).

FIG. 19 is an exploded perspective view of a disk drive device (conventional example).

FIG. 20 is an exploded perspective view of a disk drive device in which the cassette holder side is omitted (conventional example).

FIG. 21 is an enlarged cross-sectional view of a main part of a disk drive device (conventional example).

FIG. 22 is an enlarged vertical cross-sectional view of a main part showing a mounted state of a disc cassette (conventional example).

FIG. 23 is an enlarged transverse cross-sectional view of a main part showing a mounted state of a disc cassette (conventional example).

[Explanation of symbols]

 DK ... Disk cassette 1 ... Cases 9a to 9c ... Projection surface portion 30 ... Cassette holder 53a to 53c ... Pressing member

Claims (1)

[Claims] 1. A disk cassette which is inserted into a cassette holder and is located at a mounting position, and in which the case is pressed downward by a pressing member on the side of the cassette holder, wherein the mounting surface is mounted on the upper surface of the case. A disc cassette, wherein a protruding surface portion is provided at a position facing the pressing member, and only this protruding surface portion is in pressure contact with the pressing member.