JPS61250882A - Disc cartridge - Google Patents

Abstract

PURPOSE:To prevent the damage of the information face of a recording medium by providing a projected part onto a non-information region at the inner circumference of the recording medium in order to form a gap between a shutter and a recording medium. CONSTITUTION:In order to form the gap between the shutter 9 and the recording medium 3, the projection 18 is provided on the non-information region B at the inner circumference of the recording medium 3'. In case of storage or transportation of the disc cartridge 1', each opening of upper and lower cases 4, 5 is closed by a shutter 9. In this case, when an external force F is exerted to the shutter 9 from the openings 6, 7 of the upper/lower cases 4, 5, since the movement of the shutter 9s is retained by the prjection 18, the gap remains between the shutter 9 and the recording medium 3. Thus, the damage of the information face of the recording medium 3 is prevented.

Description

[Detailed Description of the Invention] [Summary] In order to protect the opening of the cartridge case containing a disc-shaped recording medium from dust, fingerprints, etc., a shutter provided inside the cartridge case receives external force. too,
The structure has a convex portion that prevents the shutter from scratching the information surface of the recording medium.

[Industrial application field]

The present invention relates to a disk cartridge in which a shutter for shielding an opening provided inside a cartridge case is deformed by pressure from the outside to prevent it from contacting and damaging the information surface of a recording medium.

A disk-shaped recording medium 1 housed in a cartridge case has an opening into which a head is inserted and an opening for rotating the recording medium, for example, in order to concentrically record information or reproduce it. It has a motor spindle insertion opening, etc.

The above-mentioned recording medium, especially an optical disk, has a high information density, and the adhesion of dust, fingerprints, etc., or mechanical damage causes bit errors, which is a serious problem.

In order to minimize the chance of dust, fingerprints, etc. adhering to the recording medium, the above opening is opened when the recording medium is loaded into the drive device, while the opening is opened when the recording medium is stored or carried outside the drive device. Sometimes a shutter is provided such that the opening is closed.

The above-mentioned shank has a structure that is installed between the cartridge case and the recording medium, and the gap between the shutter and the recording medium is small, so the shutter can easily scratch the recording medium, and the disk cartridge cannot be scratched by the shutter. is requested.

[Conventional technology]

2. Description of the Related Art Conventionally, for example, there is an optical disk cartridge as shown in FIG. 6 as a disk cartridge.

Figure 6 is a diagram showing an optical disk cartridge, and Figure (a)
is a plan view, and (b) is a side view.

In FIG. 6, an optical disk cartridge 1 (hereinafter referred to as disk cartridge 1) includes a recording medium 3 having a center hole (a hole into which a motor spindle is inserted) 2;
The recording medium 3 is covered inside with an upper case 4 and a lower case 5. The upper case 4 has a central hole 6 exposing the center hole 2, a recording/reproducing opening 7 and an index detecting opening 8 provided radially to the central hole 6, and the recording medium 3 has both sides. The lower case 5 and upper case 4 have the same shape. Furthermore, in the upper and lower cases 4.5,
There is a shutter 9 that slides on the inside to cover the central hole 6, the recording/reproducing opening 7, and the index detection opening 8, and one end a of the shutter 9 is the center of rotation, and the longitudinal end is located on the case. A spring 11 wound around a bobbin 10 is connected and constantly tensioned to the left in the figure. Further, one end of a steel heald 12 is fixed to the tip end, and the other end engages with a pin 13 of a drive device to move a rectangular guide member 14.
and are fixed with screws 15 (see Fig. 7). Note that 16 is a roller that guides the steel belt 12, and 17 is a groove for moving the guide member 14.

When this rectangular guide member 14 engages with the pin 13 of the drive device and moves to 14', the shutter 9 opens the opening, and the engagement between the pin 13 of the drive device and the guide member 14 is released. As a result, the guide member 14 is
The shutter 9 is returned to its original state and the shutter 9 is closed.

[Problem that the invention seeks to solve]

Conventional disk cartridge 1 shown in Fig. 6 (a) and (b)
The shutter 9 is located inside the upper and lower cases 4.5, and by moving the other end in the longitudinal direction with one end as the center of rotation, the shutter 9 is opened to the center hole 6 of the upper and lower cases 4.5 and the recording/reproducing opening 7.
, the index detection opening 8 is opened or closed.

For example, when the disk cartridge 1 is stored or carried outside the drive device, each opening of the upper and lower cases 4.5 is closed by the shutter 9.

However, the gap between the shutter 9 and the recording medium 3 (0°8~1
1 m) is small, and the shutter 9 is a long plate made of aluminum material with a thickness of 1.6 m. Therefore, for example, when an external force F is applied to the aperture 7 as shown in FIG. There is a problem in that the information surface A is damaged and bit errors occur. Further, the resin material of the upper and lower cases 4.5 is also thin, and the shutter 9 is easily deformed when subjected to external force, and the same can be said of the above.

Also, if the disk cartridge 1 is outside the drive device,
As shown in FIG. 8, the lower shutter 9 and the recording medium 3 are in contact with each other due to gravity, and by being inserted into the drive device, the recording medium 3 is moved to the center of the upper and lower cases 4.5 as shown by the dotted line. (See FIG. 6) As the guide member 14 moves, the shutter 9 opens.

Since the shutter 9 is in contact with the recording medium 3 when it is started, there is a problem in that the recording medium 3 is scratched by the shutter 9.

[Failure to solve the problem]

FIG. 1 is a diagram explaining the present invention in detail, and the figure is a diagram showing the conventional sixth embodiment.
Figure (7) is a sectional view of the present invention of a portion corresponding to the PP cross section.

In the figure, the upper and lower cases 4 of the disk cartridge 1'
．． 5 and shutter 9 are exactly the same as those of the conventional disk cartridge 1 shown in FIG. 6(A). In the recording medium 3' of the present invention, a convex portion 18 is provided on the insensitive area B on the inner circumference of the recording medium 3 in order to form a gap between the shutter 9 and the recording medium 3'. 3 has a double-sided structure, and the convex portions 18 are provided on both sides). The other parts are the same as those in the conventional FIG. 6(a), so their explanation will be omitted.

[Effect]

That is, the disk cartridge 1' shown in FIG. 1 has a shutter 9 inside the upper and lower cases 4.5, and when the disk cartridge 1' is outside the drive unit, such as when storing or carrying,
Each opening of the upper and lower cases 4.5 is closed by a shutter 9.

When the shutter 9 receives external force F from the opening 6.7 of the upper and lower cases 4.5, the convex portion 18 provided in the non-information area B on the inner circumference of the recording medium 3 causes the shutter 9 Since the receiver is stopped and becomes like a dotted line and does not come into contact with the recording medium 3, the information surface will not be damaged.

〔Example〕

FIG. 3 is a diagram explaining the present invention in detail.

Note that the same reference numerals refer to the same objects throughout the design.

In FIG. 3, the recording medium 3' of the present invention has a convex portion 18 (see FIG. 1) on the inner circumference of the recording medium 3' to form a gap between the shutter 9 and the recording medium 3'. It is provided on area B (the recording medium 3' has a double-sided structure, and the convex portions 18 are provided on both sides).

The convex portion 18 is formed by the recording medium 3' itself, and the convex portion 18 is formed by the machine history of the recording medium currently used.

A label displaying the following may be pasted or formed on the non-information area B on the inner circumference of the recording medium 3.

The other parts are the same as the conventional figure 6 (a), so
Explanation will be omitted.

When storing or carrying the disk cartridge 1', each opening of the upper and lower cases 4.5 is closed with a shutter 9. In this case, 1. (see Figure 2) opening 6. of upper and lower cases 4.5.
When the external force F is applied to the shutter 9 from 7, the movement of the shutter 9 is stopped by the convex portion 18, as shown by the dotted line,
There is a gap between the shutter 9 and the recording medium 3'', and the recording medium 3
It will not damage the information side of.

FIG. 4 shows another embodiment of the present invention, and FIG. 5 shows a section taken along line X--X.

Upper and lower cases 4 of disk cartridge 1'' shown in Fig. 4
', 5' are used to provide a gap between the shutter 9 and the recording medium 3 of the conventional disk cartridge 1 shown in FIG.
A convex portion 19 is provided to support one circumference (excluding the movement area of the shutter 9) or a part of the outer edge portion of the recording medium 3, which is a non-information area.

The rest of the structure is exactly the same as the conventional one, and the explanation will be omitted.

When the disk cartridge 1' is not in use and is outside the drive unit, the recording medium 3 is moved by gravity to the protrusion 19 of the lower case.
There is a gap between the recording medium 3 and the shack 9. When the disk cartridge III is inserted into the drive device during use, the shutter 9 can move without contacting the recording medium 3 and does not damage the information surface.

As described above, by providing a convex portion in the non-information area on the inner or outer circumference of the recording medium 3 and providing a gap between the shutter 9 and the recording medium 3, the information surface of the recording medium 3 can be prevented from being scratched by the shutter 9. can be prevented.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent the information surface of the recording medium from being scratched by the shutter due to the convex portion in the non-information area on the inner or outer circumference of the recording medium.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the present invention in detail, Fig. 2 is a diagram explaining the shutter pressurization by external force of the present invention, Fig. 3 is a diagram explaining the present invention in detail, and Fig. 4 is a diagram explaining the present invention in detail. Figure 5 is a sectional view taken along line XX in Figure 4, Figure 6 is a diagram illustrating a conventional optical disk cartridge, and Figure 7 is a sectional view taken along line PP in Figure 6. , FIG. 8 is a diagram for explaining the starting state of the recording medium. In the figure, 1' and 1'' are the disk cartridges, 3' is the recording medium, 4 is the upper case, 5 is the lower case, 6 is the center hole, 7 is the head insertion opening, 9 is the shutter, and trap α) Now to ℃ (”) = to

Claims (3)

[Claims] (1) A disc-shaped recording medium (3') is housed inside the cartridge case (1'), and an opening (7) for recording and reproducing information on the recording medium (3'), and the recording The cartridge case (1') has a spindle engaging opening (6) for rotating the medium, and an openable/closable shutter (9) that can cover or open each opening as required. ), the disc cartridge (1') having a guide member inside the cartridge case (1') for opening and closing the shutter (9) from the outside of the cartridge case (1') with an opening/closing pin on the drive device side; A disc characterized in that a convex portion (18) for forming a gap between (9) and the recording medium (3') is provided in a non-information area on the inner or outer circumference of the recording medium (3'). cartridge. (2) The convex portion (18) for forming the gap is formed by pasting a label on the non-information area on the inner periphery of the upper recording medium (3'). Disk cartridge as described in section. (3) The gap between the shutter (9) and the recording medium (3') is formed by supporting one or a part of the non-information area on the outer periphery of the recording medium excluding the movement range of the shutter (9). A disc cartridge according to claim 1, characterized in that: