JP3285972B2 - Disk Cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge such as an optical disk cartridge or a magneto-optical disk cartridge, and more particularly to a disk cartridge having a structure in which a tray can be inserted into and removed from the inside of a cartridge case. It is about.

[0002]

2. Description of the Related Art FIG.
FIG. 48780 is an exploded perspective view of a disk cartridge.

As shown in FIG. 1, the disk cartridge mainly comprises a lid 101, a magazine frame 102, a shutter plate 103, a magazine plate 104, and an information recording disk 105.

The rim 101 has a plate shape, a hole 106 is formed in the center, and a stabilizer 107 for holding an information recording disk 105 is arranged inside the hole 106.

[0005] At the center of the magazine frame 102, a circular cutout 180 for accommodating the information recording disk 105 is formed.

A circular hole 109 is formed in the center of the shutter plate 103, and an elongated hole 110 communicating with the circular hole 109 is provided. A shutter lever 111 is rotatably connected to one end of the shutter plate 103, and a spring 112 is arranged between the shutter lever 111 and a groove (not shown) formed on the lower surface of the magazine frame 102. ing.

A turntable insertion hole 113 is formed at the center of the magazine plate 104, and a laser light introduction hole 114 is provided near the turntable insertion hole 113.

The rim 101 is a magazine frame 10
The magazine plate 104 is supported rotatably about a base 115 with respect to the magazine frame 102.
The shutter plate 103 is rotatably disposed between the magazine frame 102 and the magazine plate 104.

When the lid 101 is closed and stored, the magazine 101, the shutter frame 10 and the shutter plate 10 are closed.
The information recording disk 1 is located in a space formed between
05 is stored. Further, the slot 110 of the shutter plate 103 corresponds to the laser light introduction hole 11 of the magazine plate 104.
4 does not match, and the laser beam introduction hole 114 is closed by the shutter plate 103.

There are two modes for using the information recording disk 105. One of them is provided in the recording / reproducing apparatus by mounting the information recording disk 105 in a state where the information recording disk 105 is stored. The leading end 116 of the shutter lever 111 is pushed by a pin for opening the shutter, whereby the shutter plate 103 is rotated, and the oblong hole 110 of the shutter plate 103 is aligned with the laser light introducing hole 114 of the magazine plate 104. In this method, the laser light introduction hole 114 is opened to record or reproduce information.

Another use mode is the magazine frame 102
In this method, the lid 101 is opened, the information recording disk 105 is taken out of the storage space, and the single disk is mounted in the recording / reproducing apparatus. Which usage mode is adopted is determined by the configuration of the recording / reproducing apparatus used.

[0012]

In this disk cartridge, since the shutter plate 103 is disposed immediately below the information recording disk 105, the shutter plate 103 is opened and closed, or the disk cartridge is transported. At times, the shutter plate 103 comes into contact with the recording surface of the information recording disk 105 and damages the recording surface, thereby causing errors in recording and reproduction.

Further, since the drive shaft insertion hole is exposed, dust can easily enter the case.

In order to prevent this from happening, a shutter having a U-shaped or L-shaped cross section is slidably mounted on the outside of the cartridge case, and the shutter does not come into direct contact with the information recording disk. A structure is employed in which the shaft insertion hole and the laser light introduction hole are covered with a shutter.

However, in this structure, since the shutter is exposed to the outside, the shutter can be easily slid. When the shutter is opened, the recording surface of the information recording disc is touched with a finger through the head insertion hole, and oils and fats adhere. And that causes an error.

Further, the U-shaped shutter is likely to be opened in a direction perpendicular to the surface of the cartridge case,
There is a problem that a gap is formed between the shutter and the cartridge case, and dust enters through the gap and adheres to the recording surface, which also causes an error.

In order to solve the above-mentioned drawbacks of the prior art, the present inventors have developed a cartridge case having a tray insertion opening formed on a side surface, a tray which is inserted into and removed from the cartridge case. A disk cartridge including a shutter slidably disposed between the cartridge case and the tray has been proposed.

The present invention relates to an improvement in a cartridge case and a tray in a disk cartridge having this configuration, and an object thereof is to provide a highly reliable disk cartridge capable of preventing intrusion of dust from the outside. It is in.

[0019]

In order to achieve the above object, the present invention provides a head insertion hole on a case and a drive shaft insertion hole on a case at predetermined positions, and a tray insertion hole on one side. Cartridge case, and a disk storage recess for storing an information recording disk, and a head insertion hole on the tray and a drive shaft insertion hole on the tray at a position corresponding to the head insertion hole on the case and the drive shaft insertion hole on the case. Each disk cartridge is provided with a tray which is provided to be removably inserted from a tray insertion opening of the cartridge case, and an information recording disk which is removably inserted into a disk storage recess of the tray.
It is assumed that. The first means of the present invention, the
Almost in the middle of the opening edge of the tray insertion slot of the cartridge case
The tray is provided with an engaging projection, and the tray is
Tray in the cartridge case when inserted into the
The pinch that comes into contact with the opening edge and is exposed outside the cartridge case
Forming an engaging portion on the tray, and
A holding recess is provided at the position facing the
It is characterized in that Second means of the present invention
When inserting the tray into the car Toritsuji case
Abut the edge of the cartridge case tray opening
Form a knob on the tray that is exposed outside the cartridge case
Then, insert the tray of the cartridge case at the knob.
At a position corresponding to almost the middle of the entrance opening edge,
Pressing protrusion that holds the tray insertion opening edge of the azalea case
A part is formed .

[0020]

[Function] When a tray insertion port is formed on the side of the cartridge case, the tray insertion port is deformed into a swelling shape.
There may be a gap between the tray and the tray. Then, debris intrudes from the gap and adheres to the surface of the information recording disk, which causes an error during recording and reproduction.

As described above, according to the present invention, the engaging portion for engaging with a part of the tray when the tray is inserted into the cartridge case is provided substantially at the middle position of the tray insertion opening edge of the cartridge case. By providing, even if the tray insertion opening of the cartridge case is deformed like a medium bulge, it is corrected, troubles due to intrusion of garbage are solved,
A highly reliable disk cartridge with few errors can be provided.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a disk cartridge according to the embodiment, FIG. 2 is a longitudinal sectional view of the disk cartridge, and FIG.
FIG. 4 is a perspective view of the disk cartridge viewed from the bottom, FIG. 4 is a perspective view of the disk cartridge with a tray pulled out, FIG. 5 is an enlarged perspective view of a shutter used for the disk cartridge, and FIG. FIG. 7 is an enlarged cross-sectional view for explaining the opening operation of the shutter, FIG. 7 is a perspective view of a groove for opening the shutter of the disk cartridge, and FIG. 8 is a part showing a state before a tray is inserted into a cartridge case. FIG. 9 is an enlarged sectional view showing a state where the tray is inserted into the cartridge case.

As shown in FIG. 1, the disk cartridge mainly comprises a first case half 1, a second case half 2, an information recording disk 3 such as an optical disk, a tray 4, and a shutter 5. ing.

The first case half 1, the second case half 2, the tray 4, and the shutter 5 are made of, for example, ABS resin, P
It is injection molded with a synthetic resin such as S resin and PC resin.

The first case half 1 has a substantially rectangular planar shape, and has an arrow and "IN" on its upper surface to indicate the direction of insertion of the disk cartridge into the recording / reproducing apparatus. A display unit 6 made of characters is provided. The first case half 1 has side walls 7, 7 and a rear wall 8, and no wall is formed on the front side, so that the first case half 1 is open.

Similarly, the second case half 2 has a substantially rectangular planar shape, and has a circular case-shaped drive shaft insertion hole 9 formed at the center thereof, and is connected to the substantially case-shaped drive shaft insertion hole 9. A head insertion hole 10 is provided. A recess 11 for allowing the shutter 5 to slide is formed in a region including the drive shaft insertion hole 9 and the head insertion hole 10 on the inner surface of the second case half 2. A pair of positioning holes 12a and 12b each formed of a circular hole and an elliptical hole are formed at a predetermined interval before the drive shaft insertion hole 9.

The second case half 2 has side walls 13, 13 and a rear wall 14, and no wall is formed on the front side, so that it is open. Lower ends of both sides 7, 7 on the near side of the first case half 1 and the second case half 2
Notches 15 are respectively provided at the upper ends on the front side of both side walls 13 and 13 (total of four places), and the first case half 1 and the second case half 2 are joined to form a cartridge case. At this time, the notches 15 are opposed to each other, and engagement openings 42 (see FIGS. 3 and 4) are formed on both side surfaces of the cartridge case.

A notch 16 is formed in the rear wall 14 of the second case half 2 on the upstream side in the disk cartridge insertion direction, and a guide having a lower height than the rear wall 14 is provided slightly forward of the rear wall 14. A wall 17 is provided. The guide wall 17 is formed continuously from one side wall 13 to the other side wall 13. The same notch and guide wall 18 (FIG. 2 and FIG.
Reference) is formed.

On the front side of the guide wall 17, a spring hook pin 19 and a stopper 20 are provided in a protruding manner. In addition,
The stopper 20 can also be provided on the guide wall 17.
Further, a rectangular contact hole 21 and a step 22 surrounding the periphery thereof are formed on the front side of the spring hook pin 19. A printed board 24 on which a memory capable of electrically erasing information, a so-called EEROM 23 is mounted. A plurality of terminal portions 41 are provided on the lower surface of the printed circuit board 24, and these terminal portions 41 are exposed from the contact holes 21 (FIG. 3).
reference). The EEPROM 23 stores, for example, data related to the information recording disk 2 via a control unit of a recording / reproducing apparatus to which the disk cartridge is mounted.

A substantially tray-shaped drive shaft insertion hole 25 is formed substantially at the center of the tray 4, and a substantially rectangular tray head insertion hole 26 is provided so as to communicate therewith. A substantially C-shaped disk storage recess 27 is formed in a region surrounding the drive shaft insertion hole 25 and excluding the head insertion hole 26.

The outer peripheral portion of the drive shaft insertion hole 25 except for the portion communicating with the head insertion hole 26 and the disk storage recess 27
A continuous or discontinuous disk support 2
8a and 28b are protruded (in this embodiment, the inner disk support 28a is formed continuously and the outer disk support 28b is formed discontinuously). When the information recording disk 3 is inserted into the disk storage recess 27 and placed on the disk support portions 28a and 28b, the recording surface (lower surface) of the information recording disk 3 is prevented from directly contacting the bottom surface of the disk storage recess 27. (See FIG. 2).

A knob portion 29 is formed on the front side of the tray 4, and elastic portions 31 which can be elastically deformed inwardly through slits 30 are integrally provided at both ends thereof.

Protrusions 32a and 32b are formed on both sides of the elastic portion 31 and on both sides on the rear side of the tray 4, respectively.

The shutter 5 is composed of a shutter plate 33 and a slider 34. The shutter plate 33 is continuously punched from a thin sheet-shaped material, and has an area that reliably covers the drive shaft insertion hole 9 and the head insertion hole 10 of the second case half 2.

The slider 34 is composed of an elongated slide portion 35 having a substantially H-shaped or rectangular cross section, which is the same as or longer than the width of the shutter plate 33, and a plate mounting portion 36 integrally formed inside the slide portion 35. It is configured.
One end of the shutter plate 33 is connected to the lower surface of the plate mounting portion 36 by an appropriate means such as ultrasonic fusion, strong fitting or adhesion.

In this embodiment, a separate shutter plate 33 is provided.
Although the slider 34 and the slider 34 are prepared and the two are integrated, the shutter plate 33 and the slider 34 can also be integrally formed by design.

As shown in FIG. 5, a stepped portion 37 is formed on the upper surface of the plate mounting portion 36, and a spring hook pin 38 is provided on the upper surface thereof. As shown in FIG.
By stretching a spring 39 between the spring hook pin 38 and the spring hook pin 19 of the second case half 2, the shutter 5 can be elastically biased toward the closed position side by the tensile force of the spring 39. The end face of the plate mounting portion 36 comes into contact with the stopper 20 of the first case half 1 or the second case half 2. In this manner, the end surface of the plate mounting portion 36 is
0, the edge of the thin shutter plate 33 does not directly contact the end of the concave portion 11 in the second half case 2, but the drive shaft insertion hole 9 and the head insertion hole of the second half case 2. 10 is to be closed. As the spring 39, a torsion spring can be used.

When the edge of the shutter plate 33 directly contacts the end of the recess 11 at the closed position of the shutter 5, the end of the thin shutter plate 33 is curled inward while the shutter 5 is repeatedly opened and closed. There is a concern that a gap may be formed between the second case half 2 and the shutter 5. If the slider 5 is pulled by the spring 39 and the edge of the shutter plate 33 is brought into contact with the end of the concave portion 11 to position the shutter 5, the shutter plate 3
Shear stress is generated at the joint between the slider 3 and the slider 34, and the shutter plate 33 may come off from the slider 34.

In this embodiment, in order to solve such a problem, the slider 34 is brought into contact with a part of the first case half 1 or the second case half 2 so that the edge of the shutter plate 33 becomes the second case half. The structure does not directly contact a part of the two-case half 2.

For example, as shown in FIG. 1, FIG. 4 and FIG. 8, an engaging projection 52 is integrally formed substantially at the center of the upper and lower tray insertion opening opening edges 51 in the cartridge case. On the other hand, a holding recess 53 (see FIG. 8) into which the engaging projection 52 is fitted is formed at a position facing the engaging projection 52 in the knob 29 of the tray 4. As shown in FIG.
The engagement protrusion 52 has a tapered surface for smooth insertion.

Accordingly, the tray 4 is placed in the cartridge case.
Is inserted, the upper and lower engaging projections 52 of the cartridge case are forcibly fitted into the holding recesses 53, respectively.
Therefore, even if the tray insertion opening of the cartridge case is deformed in a bulging shape, the engaging projection 52 is retained in the holding recess 53.
, The deformation is corrected. Therefore, no gap is formed between the cartridge case and the tray, and an excellent dustproof effect can be obtained.

Next, the order of assembling the disk cartridge will be described.

The shutter 5 is placed on the recess 11 by inserting the lower groove 40 (see FIG. 6) of the slider 34 into the guide wall 17 of the second case half 2, and the spring pin 19 and the spring A spring 39 is stretched between the hanging pin 38.

The printed circuit board 24 is placed on the step portion 22 of the second case half 2, and the terminal portion 41 provided on the lower surface of the printed circuit board 24 is connected to the contact hole 21 as shown in FIG.
It is exposed outward from.

Next, the first case half 1 is placed on the second case half 2 so that the guide wall 18 thereof is inserted into the upper groove 43 of the slider 34 as shown in FIG. ,
13 and the rear walls 8 and 14 are joined by an appropriate means such as ultrasonic welding. With this joining, the notch portions 15 of the first case half 1 and the second case half 2 are aligned with each other to form engagement openings 42 (see FIGS. 3 and 4) on both left and right sides, and a tray is provided on the near side. An insertion slot 47 is formed, and the first case half 1 and the second case half 2 constitute a cartridge case having a U-shaped cross section.

Further, by joining the first case half 1 and the second case half 2, the slider 34 is moved to the first case half 1.
And the second case half 2 are securely engaged.

Further, by joining the first case half 1 and the second case half 2, as shown in FIG.
The notches 16, 16 of the rear walls 8, 14 in 2 are aligned with each other to form a shutter opening groove 44 having an open end toward one side.

The tray 4 is inserted with a relatively strong force from the tray insertion opening 47, and the projection 32b is fitted into the engagement opening 42,
The drawer completion position of the tray 4 is secured. In this state, the information recording disk 3 is inserted into the storage recess 27 of the tray 4 and placed on the disk support 28 (see FIG. 4).

Then, the tray 4 is inserted into the cartridge case, and the projection 32a is fitted into the engagement opening 42 to be locked, so that the insertion completion position of the tray 4 is ensured. The tray insertion opening 47 of the case is closed (see FIG. 3), and the assembly of the disk cartridge is completed.

When the information recording disk 3 is mounted on the recording / reproducing apparatus while being stored in the cartridge case, the first
With the case half 1 facing upward, the disk cartridge is inserted into the recording / reproducing apparatus along the direction of the display unit 6 (see FIG. 1). As shown in FIG. 6, a shutter opening pin 45 protrudes from the cartridge insertion path in the recording / reproducing apparatus, and when the disk cartridge is inserted, the pin 45 automatically enters the shutter opening groove 44. , Comes into contact with the end of the slider 34.

By further inserting the disk cartridge, the shutter plate 33 slides in the recess 11 together with the slider 34 against the tensile force of the spring 39, and the drive shaft insertion holes 9, 25 and the head insertion holes 10, 26 are inserted. Open at the same time.

As in this embodiment, the slider 35 is made relatively longer than the width of the shutter plate 33 and is slid along the upper and lower guide walls 17 and 18, so that the shutter 5 does not rattle more smoothly. Moving. In this way, information is recorded or reproduced on the information recording disk 3.

Further, as described above, the shutter 5 has the recess 11
When the shutter 5 slides, the tray 4
Never touch.

By ejecting the disk cartridge from the recording / reproducing apparatus, the pin 4 for opening the shutter is released.
5. The shutter 5 relatively comes out of the shutter opening groove 44, and the shutter 5 returns to the home position by the pulling force of the spring 39 accompanying the shutter opening groove 44, and simultaneously closes the drive shaft insertion holes 9, 25 and the head insertion holes 10, 26. .

When the information recording disk 3 is taken out of the cartridge case and used alone, the knob 29 is used.
The elastic portions 31, 31 provided at both left and right ends of the are pinched and pressed inward to each other. Then, the projection 32a is displaced inward from the engagement opening 42 and the lock is released. In this state, the tray 4 is pulled toward the user, and the projection 32b is fitted into the engagement opening 42 as shown in FIG. In this state, the tray 4 is prevented from falling out of the cartridge case, and the information recording disk 3 is completely exposed from the cartridge case.

Since the shutter 5 is always engaged with the upper and lower guide walls 17 and 18 as shown in FIG. 2, even if the tray 4 is pulled out, the shutter 5 remains in the cartridge case as it is. As a result, the drive shaft insertion hole 25 provided in the tray 4 as shown in FIG.
Are opened without being disturbed by the shutter 5.

Accordingly, the drive shaft insertion hole 25 of the tray 4 is moved from the disc side drive shaft insertion hole 46 of the information recording disk 3.
The information recording disk 3 can be easily taken out of the tray 4 by inserting a fingertip. Then, the information recording disk 3 alone is mounted on a recording / reproducing apparatus to record or reproduce information.

After recording and reproduction, the information recording disk 3 is again stored in the concave portion 27 of the tray 4 and the tray 4 is pushed into the cartridge case, as shown in FIG.
Engages with the engagement opening 42 to lock the tray 4 with respect to the cartridge case, so that the tray 4 does not come out unexpectedly.

FIGS. 10 and 11 are diagrams for explaining a second embodiment of the present invention. In the case of this embodiment, a holding portion for holding the tray insertion opening opening edge 51 of the cartridge case at a position corresponding to the center of the tray insertion opening opening edge 51 of the cartridge case of the knob portion 29 formed on the tray 4. A protrusion 54 is formed.

Accordingly, the tray 4 is placed in the cartridge case.
11, the center of the tray insertion opening opening edge 51 in the cartridge case is pushed by the holding projection 54 as shown in FIG. 11. Therefore, even if the tray insertion opening of the cartridge case is deformed in a bulging manner, the center of the opening edge 51 of the tray insertion opening is forcibly pushed by the holding projection 54, and the deformation is corrected. You. Therefore, no gap is formed between the cartridge case and the tray,
Excellent dustproof effect can be obtained.

In the case of this embodiment, the central portion of the tray insertion opening opening edge 51 of the cartridge case corresponds to an engaging portion that engages with the holding projection 54 of the tray 4.

FIG. 12 and FIG. 13 are views for explaining a third embodiment of the present invention. In the case of this embodiment, a rounded convex portion 52a is provided at the tip end of the engaging projection 52, while an opening 55 into which the convex portion 52a is fitted is formed at the root of the pressing projection 54 of the tray 4. Is formed. The engagement between the convex portion 52a and the opening 55 can prevent the tray 4 from unexpectedly coming out.

FIG. 14 is a diagram for explaining a fourth embodiment of the present invention. In the case of this embodiment, the engaging projection 52 and the holding projection 54 engage with each other on an inclined surface.

FIGS. 15 and 16 are views for explaining the fifth embodiment of the present invention. In the case of this embodiment, engaging recesses 56 are provided at the edges of the opening of the tray insertion opening of the first case half 1 and the second case half 2, and the pressing projections 54 of the tray 4 are provided in the engaging recesses 56. Insert. Steps 57 are formed inside the holding projections 54, 54. As shown in FIG. 16, the first case half 1 and the second case half are located between the step 57 and the holding projection 54. The tray insertion opening opening edge 51 of the body 2 is sandwiched.

In each of the above embodiments, the engaging projection 52 is used.
Alternatively, one engaging recess 56 is provided at a substantially intermediate position of the tray insertion opening opening edge 51, but the present invention is not limited to this, and the engaging protrusion 52 or the engaging recess 56 is provided.
May be provided at predetermined intervals along the tray insertion opening edge 51, and the engagement projection 52 or the engagement concave portion 56 may be formed over substantially the entire length of the tray insertion opening edge 51.

[0066]

As described above, according to the present invention, when the tray is inserted into the cartridge case, it is engaged with a part of the tray substantially at the middle position of the edge of the tray insertion opening of the cartridge case. Since the portion is provided, the tray insertion opening of the cartridge case is prevented from being deformed in a bulging manner, so that troubles caused by invasion of dust can be eliminated, and a highly reliable disk cartridge can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a disk cartridge according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the disk cartridge.

FIG. 3 is a perspective view of the disk cartridge seen from the bottom.

FIG. 4 is a perspective view of the disk cartridge with a tray pulled out.

FIG. 5 is an enlarged perspective view of a shutter used for the disk cartridge.

FIG. 6 is an enlarged cross-sectional view for explaining an opening operation of the shutter in the disk cartridge.

FIG. 7 is a perspective view of a groove for opening a shutter of the disk cartridge.

FIG. 8 is a partially enlarged cross-sectional view showing a state before a tray is inserted into a cartridge case.

FIG. 9 is a partially enlarged cross-sectional view showing a state where a tray is inserted into a cartridge case.

FIG. 10 is a partial plan view of a disk cartridge showing a second embodiment of the present invention.

FIG. 11 is an enlarged sectional view taken along the arrow line in FIG.

FIG. 12 is a partial sectional view of a disk cartridge showing a third embodiment of the present invention.

FIG. 13 is a partial perspective view of a first case half used in the embodiment.

FIG. 14 is a partial sectional view of a disk cartridge showing a fourth embodiment of the present invention.

FIG. 15 is a partial perspective view of a disk cartridge showing a fifth embodiment of the present invention.

FIG. 16 is a partial sectional view of the disk cartridge of the embodiment.

FIG. 17 is an exploded perspective view of a conventionally proposed disk cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st case half 2 2nd case half 3 Information recording disk 4 Tray 5 Shutter 9 Case upper drive shaft insertion hole 10 Case upper head insertion hole 25 Tray upper drive shaft insertion hole 26 Tray upper head insertion hole 27 Disk storage recess 47 Tray insertion opening 51 Tray insertion opening opening edge 52 Engagement projection 53 Pressing recess 54 Pressing projection 56 Engaging recess

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kintane Tsuburaya 1-88 Ushitora, Ibaraki-shi, Osaka Hitachi Maxell Co., Ltd. (56) References JP-A-2-1233582 (JP, A) JP-A Sho 58-153279 (JP, A) JP-A-57-176562 (JP, A) JP-A-63-34780 (JP, A) JP-A-61-83174 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 23/03

Claims (2)

(57) [Claims] 1. A cartridge case having a head insertion hole on the case and a drive shaft insertion hole on the case at predetermined positions and having a tray insertion hole on one side surface, and a disk storage recess for storing an information recording disk. Have
A tray head insertion hole and a tray drive shaft insertion hole are provided at positions corresponding to the case head insertion hole and the case drive shaft insertion hole, respectively, and the tray is inserted so as to be able to be taken in and out of the tray insertion port of the cartridge case. And a disc cartridge having an information recording disc removably inserted into and removed from the disc storage recess of the tray.
An engagement projection is provided at the position between the trays, and the tray is inserted when the tray is inserted into the cartridge case.
Abut the edge of the tray insertion opening of the cartridge case.
Form a knob on the tray that is exposed outside the ridge case.
And engages the knob at a position facing the engaging projection.
A disc cartridge having a holding recess into which a projection is fitted . 2. A head insertion hole on a case at a predetermined position.
And a drive shaft insertion hole on the case.
A cartridge case with an insertion slot, and a disk storage recess for storing an information recording disk,
Head insertion hole on the case and drive shaft insertion on the case
At the position corresponding to the hole, insert the head
(A) Provide the upper drive shaft insertion holes, and
Tray that can be inserted and removed from the tray
Lee and, out allows insertion of the disk housing recess of the tray
Disk cartridge with an information recording disk
In the above, when the tray is inserted into the cartridge case, a knob portion which comes into contact with an opening edge of the tray insertion opening of the cartridge case and is exposed outside the cartridge case is formed on the tray, and the cartridge portion of the knob portion is formed. A disc cartridge characterized by forming a holding projection for holding the tray insertion opening edge of the cartridge case at a position substantially corresponding to a middle position of the tray insertion opening edge of the case.