JP2001357649A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge applicable to a large-sized head by largely protruding an information recording disk from a cartridge casing. SOLUTION: A disk protruding port 4 is provided in the end surface of the cartridge casing 3, a hub moving groove 6 which extends from the approximate center to the disk protruding port 4 side is formed in the plane of the cartridge casing 3, and a shutter 7 for opening and closing the hub moving groove 6 and a lid member 5 for opening and closing the disk protruding port 4 are provided in the cartridge casing 3. When the cartridge is used, the shutter 7 is opened and also the lid member 5 is inclined down to this side to open the disk protruding port 4, a hub 1 is chucked by a chucking mechanism of a recording/reproducing device, the cartridge casing 3 is moved, and whereby the hub 1 is relatively moved within the hub moving groove 6. Thus, the information recording disk 2 is largely protruded from the cartridge casing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk cartridge such as an optical disk cartridge or a magnetic disk cartridge, and more particularly to a disk cartridge structure applicable to a large head.

[0002]

2. Description of the Related Art In recent years, an optical information recording apparatus which records a large amount of data at a high density and rapidly reproduces the data in response to multimedia has been receiving attention. This optical information recording device is C
D, using a read-only disk that can only read information by stamping information on the disk when manufacturing the disk, such as a laser disk, and a write-once type that can record only once, such as a CD-R There are those using a disk and those using a rewritable disk in which data can be rewritten / erased any number of times using a magneto-optical recording method or a phase change recording method. Among these optical information recording devices, magneto-optical recording devices are mainly used in fields requiring a high transfer rate.

Further, data recording / reproducing is performed using a light spot in which a laser beam is narrowed down to a diffraction limit by a lens. The size of this light spot is about λ / NA, where λ is the wavelength of the laser beam and NA is the numerical aperture of the lens. In order to record / reproduce a higher density, that is, a smaller pattern, a smaller laser beam spot is required.

In order to reduce the light spot, λ / N
From the formula of A, two methods of reducing the wavelength λ of the laser beam and increasing the numerical aperture NA of the lens can be considered. The numerical aperture NA of the lens is expressed as NA = sin θ, where θ is the half angle of the aperture of the lens, and is a value smaller than 1.

[0005] The numerical aperture NA of an objective lens used in an optical information recording apparatus currently in practical use is at most 0.1.
It is about 6. This is because as the numerical aperture NA increases,
This is because coma and astigmatism when the optical axis of the objective lens is inclined with respect to the substrate increase.

In order to solve this problem, the thickness of a transparent layer through which light passes (corresponding to the thickness of a transparent substrate in a conventional optical information recording apparatus) is reduced, and the optical axis of the objective lens is positioned on the transparent substrate. It is important not to lean against it. Therefore, grooves and pits for obtaining tracking signals and address signals are formed on a transparent substrate, a recording layer including a reflective layer is formed thereon, and a transparent resin layer having a thickness of about 0.1 mm is formed thereon. There has been proposed an optical information recording medium which performs recording and reproduction by using an information recording medium formed with a recording medium and pressing a slider having an objective lens or the like against the surface of the transparent resin layer of the information recording medium, and a method of manufacturing the same ( See JP-A-8-235638).

However, in this optical information recording medium, the slider moves while being pressed against the transparent resin layer.
There is a problem that the transparent resin layer is easily damaged by the sliding contact between the slider and the transparent resin layer.

Further, the transparent resin layer formed on the recording layer is
It is formed by spin-coating an ultraviolet curable resin or by bonding a transparent resin film. When bonding a transparent resin film, it is necessary to bond the film and the recording layer in such a manner that no air pockets or air bubbles are formed between them, and productivity becomes a problem.

Further, the thickness of the ultraviolet curable resin layer is 0.1 mm.
When the coating is formed to the extent of about 5 to 10 times as thick as the protective film thickness of the ordinary optical information recording medium of 10 to 20 μm,
It is necessary to set the resin viscosity considerably high. in this case,
Problems such as the uniformity of the transparent resin layer and the generation of air bubbles due to the entrainment of air occur, causing problems in productivity and yield as in the case of bonding the transparent resin film.

On the other hand, light is focused on an information recording medium through a solid hemispherical lens (SIL), and the distance between the SIL and the surface of the optical information recording medium is 1 / 4λ (λ: wavelength of laser light).
As the degree, the N of the objective lens is effectively reduced by using the near-field light.
A near-field optical recording / reproducing method that increases A has been proposed.
However, even in this case, when the wavelength of the laser beam is 650 nm, the distance between the bottom surface of the SIL and the surface of the optical information recording medium is very narrow, 160 nm, and there is a problem that the surface of the optical information recording medium is damaged by the SIL. Become. For this reason, in a cartridge for storing a disc,
It is necessary to minimize the attachment of dust and the like to the disk surface when not in use.

In addition, these recording methods allow recording and reproduction on both sides of the disc. But,
As a result, the height and size of the head are doubled. Further, in the case of an optically assisted hard disk or the like which is expected as a technology for increasing the density of an information recording medium, an increase in the size of the head is inevitable.

[0012]

For this reason, there is a demand for a disk cartridge having a large head opening. However, a conventional disk cartridge has a rectangular head opening sectioned at a predetermined position of a cartridge case. When using a large head from such a background,
There is a problem in that the peripheral case portion that defines the head opening becomes an obstacle, and when the disk cartridge is mounted on the recording / reproducing apparatus, the head collides with the case portion, causing various troubles.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk cartridge which can be applied to a large-sized head by making an information recording disk protrude largely from a cartridge case.

[0014]

In order to achieve the above object, the present invention provides an information recording disk such as an optical disk or a magnetic disk having a hub at the center, and a disk cartridge having a cartridge case for accommodating the information recording disk. A shutter for opening and closing the hub moving groove, wherein a disc protrusion is provided on an end surface of the cartridge case, and a hub moving groove extending from substantially the center to the disk protrusion side is formed in a plane of the cartridge case;
A lid member for opening and closing the disk protrusion is provided in the cartridge case.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, according to the present invention, a disc protrusion is provided on an end face of a cartridge case, and a hub moving groove extending from a substantially center to a disc protrusion side is formed in a plane of the cartridge case. A shutter for opening and closing the hub moving groove and a lid member for opening and closing the disk projection opening are provided in the cartridge case. In use, the shutter is opened, and the lid member is turned down to open the disk projection opening to record the hub. The information recording disk protrudes from the cartridge case by chucking by the chucking mechanism of the playback device and moving the cartridge case, thereby moving the hub relatively in the hub moving groove. In this case, recording and reproduction are performed without collision between the head and the cartridge case.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view when the disk cartridge according to the embodiment is not used, and FIG. 2 is a plan view when the same is used.

The disc cartridge includes an information recording disc 2 having a hub 1 in the center, and the information recording disc 2
Is provided.

The disk cartridge of the present invention
A disc protrusion 4 is formed on an end face of the cartridge case 3, and a lid member 5 for opening and closing the disc protrusion 4 is provided. The cover member 5 stands up and closes the disk protrusion 4 in the unused state of the disk cartridge shown in FIG. 1, while in the used state of the disk cartridge shown in FIG.
The disc is opened horizontally by tilting it horizontally toward the front side. The closed state of the cover member 5 is maintained by a lock means (not shown). When the disk cartridge is used, the locked state is released and the disk protrusion 4 is opened.

Further, in the disk cartridge of the present invention, a hub moving groove 6 linearly extending from substantially the center to the disk projecting opening 4 side is formed on the plane of the cartridge case 3, and the hub moving groove 6 is opened and closed. Shutter 7 is provided. The shutter 7 closes the hub moving groove 6 when it is not used as shown in FIG. 1, while it moves to the left in the figure to open the hub moving groove 6 when it is used as shown in FIG.

Next, the operation of the disk cartridge will be described. At the time of use shown in FIG. 2, the shutter 7 is opened, and the cover member 5 is tilted forward to open the disk protrusion 4, and
The hub 1 is supported by the chucking mechanism of the recording / reproducing apparatus, and the cartridge case 3 is moved in the direction of arrow X, whereby the hub 1 is relatively moved in the hub moving groove 6, and the information recording disk 2 is moved in the cartridge case. 3 is made to protrude greatly. In this state, the information recording disk 2 is driven to rotate, and information is recorded and reproduced by the head.

As described above, the recording and reproduction are performed by making the information recording disk 2 largely protrude from the cartridge case 3. Therefore, even if the head becomes large, the recording and reproducing can be performed without collision between the head and the cartridge case 3. Can be played.

[0022]

As described above, according to the present invention, a disc protrusion is provided at an end face of a cartridge case, and a hub moving groove extending from a substantially center to a disc protrusion side is formed in a plane of the cartridge case. A shutter for opening and closing the moving groove and a lid member for opening and closing the disk protrusion are provided in the cartridge case. In use, the shutter is opened, and the cover member is turned down to open the disk protrusion and the hub is connected to the recording / reproducing apparatus. The information recording disk protrudes from the cartridge case by chucking with the chucking mechanism and moving the cartridge case relatively in the hub moving groove, thereby increasing the size of the head. However, recording and reproduction can be performed without collision between the head and the cartridge case.

[Brief description of the drawings]

FIG. 1 is a plan view when a disk cartridge according to an embodiment of the present invention is not used.

FIG. 2 is a plan view when the disk cartridge is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub 2 Information recording disk 3 Cartridge case 4 Disk protrusion 5 Lid member 6 Hub moving groove 7 Shutter

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hitoshi Watanabe 1-88 Ushitora, Ibaraki-shi, Osaka Hitachi Maxell Co., Ltd. (72) Inventor Satoshi Yamagata 1-88 1-1 Ushitora, Ibaraki-shi, Osaka Hitachi Maxell, Inc.

Claims (1)

[Claims] 1. A disc cartridge comprising an information recording disk having a hub at the center and a cartridge case for accommodating the information recording disk, wherein a disc protrusion is provided at an end surface of the cartridge case, and the cartridge case has a substantially flat surface. A hub moving groove extending from the center to the disk protrusion opening side is formed, and a shutter for opening and closing the hub movement groove and a lid member for opening and closing the disk protrusion opening are provided in the cartridge case. Disk cartridge.