JPH0617234Y2 - Disc cartridge - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a disk cartridge, and more particularly to a hermetic (sealed) cartridge for housing a disk in an airtight manner.

[Outline of device]

According to the present invention, in a disk cartridge for rotating a disk by applying a rotating magnetic field from an external magnetic field provided outside the housing to a rotor rotatably provided integrally with the disk, the rotor is fixed to a portion of the housing facing the rotor. The rotor cover is configured to suppress the warp of the housing, so that the disc cartridge has a structure to overcome the internal and external pressures.

[Conventional technology]

In recent years, as a disc cartridge, a so-called hermetic cartridge has been proposed in which the disc is hermetically housed so that it can be used in a special environment (for example, “Japanese Patent Publication No. 60-48818”).

[Problems to be solved by the device]

This hermetic cartridge is, for example, in an aircraft,
It is often used in places where pressure changes drastically. In this case, since the conventional general disk cartridge has an internal space, the housing warps when an internal pressure or an external pressure is applied,
For this reason, the disk cartridge is greatly deformed and cannot be inserted into the disk drive device, and there is a problem that rotation of the housed disk is hindered.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a disk cartridge having a structure that overcomes the internal and external pressure applied to the housing.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the disk cartridge of the present invention rotatably supports the disk inside the housing, and the disk provided by the rotating magnetic field applied from the outside of the housing to the rotor provided on the inner peripheral portion of the disk. In a disk cartridge that is driven to rotate, a rotor cover is arranged on a portion of the housing facing the rotor so as to be flush with the one plane of the housing, and a step portion is formed on one plane of the housing to form one plane of the housing. And a substantially central portion of the rotor cover is fixed to the other surface of the housing while the rotor cover is in surface contact with the step portion.

[Action]

With this configuration, even if the inner surface of the housing is warped due to changes in the inner and outer pressures of the disk cartridge, the warp is minimized by the rotor cover, and therefore the disk cartridge is not deformed. .

〔Example〕

An embodiment of a disk cartridge of the present invention will be described below with reference to the drawings.

In this example, a disk cartridge that houses a magneto-optical disk used for magneto-optical recording will be described.

In the figure, (1) shows a disk cartridge as a whole, and this disk cartridge (1) is formed by combining an upper housing (2) and a lower housing (3) made of metal having a required strength, for example, aluminum, by screwing. , A magneto-optical disk (hereinafter simply referred to as a disk) (4) is rotatably housed inside the disk. That is, the circular disk storage recesses (2) are formed on the inner surfaces of the upper housing (2) and the lower housing (3), respectively.
a) and (3a) are formed, and the disc storage recess (2
A disk (4) is arranged in a) and (3a).

Further, a groove (5) is formed on the outer periphery of the disc housing recess (2a) in the upper housing (2), and an O-ring (6) is provided in the groove (5) to form the upper housing (2) and the lower housing (3). ), The disk cartridge (1) is inserted by the O-ring (6).
The internal airtightness is maintained, and the disk (4) is completely shielded from the outside air.

In addition, the inner surface of the two housings (2) and (3), that is, the disk storage recess (2
In (a) and (3a), a plurality of ribs (7) and (8) are formed radially from the center toward the outer periphery, respectively.
By (8) and (8), both housings (2) and (3) have the required rigidity.

The disc (4) is rotatably supported at its center, that is, the disc housing recess (3a) of the lower housing (3).
The fixed shaft (9) is fixed by the screw (10) at the center of
A hub (12) made of iron material is rotatably supported on the fixed shaft (9) via a ball bearing (11), and a disk (4) is attached to the hub (12) at its center by an adhesive. It is fixed.

And on the upper surface of this hub (12) the rotor magnet (13)
Is fixed, and when the disc cartridge (1) is inserted into the disc drive as will be described later, the rotor magnet (13) is formed so as to correspond to the stator coil arranged on the disc drive side. ing.

In addition, a rotor cover (14) is attached to the upper housing (2) at a portion facing the rotor magnet (13). That is, a fixing hole (15) is formed in the center of the upper housing (2), and the fixing hole (15) has a rotor cover (14) whose upper surface is the same as the upper plane of the upper housing (2). Fit so that it becomes a surface,
The central portion is screwed to the fixed shaft (9) with a screw (16), and the outer peripheral surface of the rotor cover (14) and the inner peripheral surface of the fixing hole (15) are bonded with an adhesive.

As will be described later, the rotor cover (14) is made of a material having a small eddy current loss with respect to the rotating magnetic field applied from the stator coil on the disk drive side when the disk cartridge (1) is inserted into the disk drive, for example, It is made of stainless steel. As the material having a small eddy current loss, a non-magnetic material having a required strength such as hard plastic can be used.

Further, in the disc cartridge (1) of this example, the rotor cover (14) holds the upper casing (2) so as not to cause warping. That is, a flange (14a) is formed on the upper edge of the outer peripheral surface of the rotor cover (14) so as to project over the entire circumference, while the upper casing is correspondingly formed.
At the upper opening edge of the fixing hole (15) of (2), a stepped portion (15a) that is lowered one step lower is formed, and the flange (14a) of the rotor cover (14) is faced to this stepped portion (15a). By fixing the center part of the rotor cover (14) to the fixed shaft (9) on the lower housing (3) side with the screw (16) in the state of being engaged in a contact state, the upper housing is fixed.
The central portion of (2) is pressed down by the rotor cover (14) to suppress upward warping.

Further, in the rotation support part of the disc (4), the fixed shaft (9)
The O-ring (17) is inserted into the groove formed in the lower end surface of the so as to be sandwiched between the lower housing (3) and the fixed shaft (9), and the fixed shaft (9)
An O-ring (18) is inserted into a groove formed on the upper end surface of the so as to be sandwiched between the rotor cover (14) and the fixed shaft (9), and these O-rings (17) and (18) are used. Each screw (10)
The inside of the disk cartridge is hermetically sealed so that outside air does not enter through the holes (16).

In the disc cartridge (1) of this example in which the disc (4) is rotatably enclosed as described above, the lower housing
A window portion (19) is formed in the concave portion (3b) formed in the front portion of (2) in the radial direction of the disc (4), and the window portion (19) is fixed to the inner surface side of the glass. The entire surface is covered with a window (20), and a light beam enters and exits through this glass window (20) during recording / reproduction.

Further, the lower housing (3) is provided with a shutter (21) for opening and closing the window hole (19). The shutter (21) is slidable in the front-rear direction, covers the window hole (19) at the front sliding position when not in use, i.e. in a storage state, and when in use, i.e., the disc cartridge (1) is a disc drive device. When inserted in, it is slid rearward to expose the window hole portion (19).

Corresponding to the window hole portion (19), the upper housing (2) is provided with a concave cutout portion (22) extending from the front end edge thereof toward the center. The notch (22) has a predetermined depth, and the back side of the bottom of the notch (22) corresponds to the disc (4) at a slight interval so that when the disc cartridge (1) is inserted into the disc drive. The external magnetic field generating means for magneto-optical recording provided on the disk drive side is arranged in the notch (22). Also, in this example, this notch
The bottom part of (22) is formed particularly thin as compared with the other parts, that is, the thickness of the flat plate part of both housings (2) and (3) is, for example, 2.5 mm.
The thickness of the bottom of this notch (22) is 1
The magnetic field of the external magnetic field generating means is made closer to the disk (4) by forming it to about mm.

Furthermore, both housings (2) of this disk cartridge (1) and
Elastic cushions (23) and (24) are fixed to the four corners of (3), respectively.When the disc cartridge (1) is accidentally dropped, the elastic cushions (23) and (24) are ) To absorb the shock and protect the disk (4).

On the other hand, reference numeral (30) shows a disk drive device into which the disk cartridge (1) is inserted and loaded.

(31) is a stator yoke, (32) is this stator yoke (31)
A stator coil fixed to the lower surface of the stator coil (1) when the disc cartridge (1) is inserted, the stator coil (32) faces the rotor magnet (13) through the rotor cover (14), A flat brushless motor is constituted by 13) and the rotor magnet (13).
Then, by energizing the stator coil (31) to generate a rotating magnetic field, the rotor magnet (13) is rotated, so that the disk (4) is rotationally driven integrally with the rotor magnet (13).

Further, (33) is an optical head, and when the disc cartridge (1) is inserted, the optical head (33) is brought into a state corresponding to the window hole (19). Then, the light beam emitted from the objective lens of the optical head (33) passes through the glass window (20) and forms a spot on the recording medium surface of the disc (4), thereby recording / reproducing signals. Be done.

Further, (34) is a magnet as an external magnetic field generating means for signal recording, and when the disk cartridge (1) is inserted, the magnet (34) is placed in the notch (22), and this magnet ( An external magnetic field for magneto-optical recording is applied to the recording medium surface of the disk (4) by 34).

Then, with this external magnetic field applied, the optical head (33)
The light beam emitted from the laser beam is imaged on the surface of the recording medium of the disk (4), so that the reversal of the magnetization occurs due to the external magnetic field, thereby recording the signal.

The disc cartridge of this example configured as described above is
Since it is a hermetic cartridge in which the disks (4) are housed in the upper and lower casings (2) and (3) in an airtight manner, it can be used in, for example, an airplane or in the future in a special environment such as outer space.

And this disc cartridge (1) is
Since the structure is used to hold down the central part of the upper housing (2) by (14), even if the upper housing (2) is warped upward due to changes in the internal or external pressure of the disk cartridge (1), Warpage is minimized by the rotor cover (14), which is why the disc cartridge (1)
Does not cause significant deformation.

Further, when the disc (4) is driven to rotate, the rotor cover (14) is made of stainless steel or the like with little eddy current loss, so that the rotating magnetic field by the stator coil (32) is sufficiently applied to the rotor magnet (13). Therefore, the disk (4) is stably rotated.

Further, in this disc cartridge (1), a notch portion in which a magnet (34) as an external magnetic field generating means is arranged
Since the notch (22) is formed thin by providing the (22), the distance between the magnet (34) and the disc (4) becomes short, and therefore the external magnetic field due to the magnet (34) is generated by the disc (4). ) Is sufficiently applied to the surface of the recording medium, so that reliable magneto-optical recording is performed.

In the present embodiment, the disk cartridge for accommodating the magneto-optical disk has been described, but the present invention is not limited to this, and it is needless to say that the invention can be applied to a disk cartridge for accommodating a general optical disk, a magnetic disk or the like. Is.

[Effect of device]

As described above, the disk cartridge of the present invention has the structure in which the warp of the housing is suppressed by the rotor cover fixed to the portion of the housing facing the rotor, so that the warp of the housing due to the internal pressure or the external pressure is minimized. Therefore, since the disc cartridge is not significantly deformed, the disc cartridge can be smoothly inserted into the disc drive device and the rotation of the disc is not hindered.

[Brief description of drawings]

FIG. 1 is a vertical side view of the disc cartridge of the present invention inserted in a disc drive, FIG. 2 is a perspective view of the disc cartridge of the present invention, and FIG. 3 is a perspective view of the disc cartridge seen from below. The figure is an exploded perspective view of the same. In the figure, (1) is the disk cartridge, (2) is the upper housing,
(3) is the lower housing, (4) is the disc, (14) is the rotor cover,
(14a) is a flange, (15) is a fixing hole, and (15a) is a step.

Claims (1)

[Scope of utility model registration request] 1. A disk is rotatably supported in a window-closed housing, and the disk is rotationally driven by a rotating magnetic field applied from outside the housing to a rotor provided on an inner peripheral portion of the disk. In the disk cartridge, a rotor cover is arranged on a portion of the housing facing the rotor so as to be flush with the one plane of the housing, and a step portion is formed on the one plane of the housing. And the rotor cover in surface contact with the stepped portion, the substantially central portion of the rotor cover is screwed to the other surface of the housing, and the rotor cover suppresses warping of one surface of the housing. A disk cartridge characterized in that