JPH03142767A - Recording medium of optical disk - Google Patents

Abstract

PURPOSE:To improve portability and to enhance a memory capacity, access speed and transfer speed by embedding a ferromagnetic material into the slope of the through-hole of a case and forming a part of a hub of a soft magnetic material. CONSTITUTION:The optical disk 1 is housed into a disk-housing recess 21 of the case 2. The ring of the ferromagnetic material or magnetic powder is embedded near the circumference of the through-hole 23 of the case 2 and a part of the hub 12 is constituted of the soft magnetic material. The optical disk 1 is, therefore, attracted to the case 2 by magnetic force and is integrally fixed to the case 2 while the optical disk 1 is held housed in the case 2. The dislodgment of the disk from the case 2 is thus prevented. Since the case is opened on one side, the thickness of the case may be as small about 50% up the thickness of the disk. This recording medium is as thick as a card calculator and is convenient to carry.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical disc recording medium used for storing various information such as code information and image information.

(Prior Art) In recent years, optical disks have come to be widely used as large-capacity external storage devices for large-sized computers and file devices for OA terminals, taking advantage of their characteristic high density.

In particular, write-once and rewritable optical discs with a diameter of 130 m are becoming increasingly standardized and are about to become the first optical discs to be used in large quantities. Further, studies are progressing on optical discs with a diameter of 90III and 11, and it is now technically possible to realize them. The storage capacity of these media is approximately 200 MB to 600 MB, which is extremely large compared to conventional floppy disks.

(Problem to be Solved by the Invention) However, conventional optical disc recording media have an outer shape of
The size is about 0 cm to 15 cm, which is not necessarily a size suitable for carrying, and it is difficult to say that it is excellent in portability.

On the other hand, there are magnetic cards and IC cards as storage media designed for portability, but these have a storage capacity of several hundred kilobytes.
The following is not satisfactory.

Recently, research on optical cards has been actively conducted, but since the recording method is linear stripes in which the card is moved back and forth, the recording mechanism is complicated and expensive. In addition, the recording density is low and the storage capacity is insufficient at several MB. Furthermore, due to the limitations of the recording mechanism, the transfer speed and access time are slow, which limits its uses.

The present invention has been made in view of the above circumstances, and its purpose is to have a size similar to that of a magnetic card or an IC card and excellent portability, a storage capacity of several tens of MB or more, and a 90 m+s An object of the present invention is to provide an optical disc recording medium that can achieve high access speeds and transfer speeds similar to those of optical discs.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an optical disc having a recording film on one side and a hub coupled to a drive unit of an optical disc drive mechanism in the center thereof; a card-shaped case having a recess for storing the optical disk on one side and a through hole in the center of the recess into which the hub fits; the through hole of the case has a slope; A ring of ferromagnetic material or magnetic powder is embedded in the slope, and the hub has a slope opposite to the case slope, and at least a portion is formed of a soft magnetic material or at least a portion includes soft magnetic powder. A mixed optical disc recording medium was constructed.

(Function) According to the present invention, the optical disc is stored in the disc storage recess of the case. A ferromagnetic ring or magnetic powder is embedded near the through hole of this case, and
A part of the hub is made of soft magnetic material, so when the optical disc is stored in the case, the optical disc is attracted to the case by magnetic force and is integrally fixed to the case, so it will not fall out of the case. .

(Embodiment) Fig. 1 is an overall perspective view showing an embodiment of an optical disc recording medium according to the present invention, in which (a) in Fig. 1 is a perspective view of the optical disc, and (b) in Fig. 1 is a perspective view of the optical disc. It is a perspective view of a case.

In (a) and (b) of FIG. 1, 1 is an optical disk;
11 is a recording film, 12 is a hub, 13 is a center hole, 2 is a case, 21 is a concave part for storing the optical disc 1 (hereinafter referred to as a disc storage part), 22 is a recess, and 23 is a case center hole (
through hole).

Further, FIG. 2 is a cross-sectional view for explaining the details of the structure of the optical disc recording medium according to the present invention.
a) is a cross-sectional view of the disk taken along line A-A in (a) of Figure 1, and (b) of Figure 2 is a case taken along line B-B in <b> of Figure 1. FIG.

In FIGS. 2(a) and (b), 14 is a slope formed on the outer periphery of the hub 12, 15 is a ring-shaped soft magnetic material part provided along the outer periphery of the hub 12, and 24 is a case. The slope 25 is a ring-shaped ferromagnetic portion formed along the case slope 24.

The configuration and functions of FIGS. 1 and 2 will be explained in detail below.

In FIG. 1(a) and FIG. 2(a), the optical disc 1 is made of the same material as a normal optical disc, such as polycarbonate or PMMA, and has a diameter of 50 mm and a thickness of 0.5 m.
It is formed with a structural parameter of about m to 1.2 degrees. Furthermore, grooves or bits are previously formed on the surface on which the recording film 11 is formed during injection molding.

That is, the grooves or two symmetrical series of bits necessary for tracking the light beam formed on the stamper are transferred and formed. On the groove or bit,
A write-once recording film such as TeSb, in which bits are formed by light energy, and a rewritable recording film, such as TbPe, in which minute magnetization reversal regions are formed, are formed by sputtering or the like.

Further, when the hub 12 attached to the recording film 11 side of the central part of the optical disc 1 is inserted into a disc drive device (hereinafter referred to as a disc drive), it is coupled with a flange 33 for driving the disc, which will be described later, and generates a driving force. is transmitted to the optical disc 1. A slope 14 is formed on the outer periphery of the hub 12, and a ring-shaped soft magnetic material portion 15 is embedded near the slope 14. The soft magnetic material portion 15 may be a ring of magnets, or may be molded with a block or powder of soft magnetic material. Although not shown, a penetrating hole may be provided in the center of the optical disc 1, including the purpose of removing irregularly shaped portions during material supply during injection. Plastic optical discs usually have a hollow in the center, but glass discs may not have a hollow. In this case, a hub may be attached.

Further, as shown in FIG. 2(b), the case 2 has, for example, a length of 60 mm to 90 mm, a width of 54 mm, and a thickness of 1.5 mm.
(thicker than the optical disc 1). The disc storage section 21 stores the optical disc 1.
It is formed by hollowing out a circular shape with a certain depth on one side of the case 2 to a size that allows insertion. Moreover,
On the inner surface of the case 2 facing the grooved portion of the optical disc 1, a recess 22 is further formed to prevent direct contact between the recording film 11 and the inner surface of the case. . Note that this relief 22 is not necessarily necessary.

The case center hole 23 is formed at the center of the disc storage section 21. The case slope 24 formed at the edge is
It is formed at an angle to fit with the slope 14 of the hub 12 of the optical disk 1, and a ring-shaped ferromagnetic material portion 25 is molded along the edge thereof. This ferromagnetic material part 2
5 doesn't matter whether it's on the surface or buried inside. It is desirable that the height of the hub 12 and the thickness of the case 2 be approximately the same in order to increase the attraction force of the magnet and to make the entire device thinner. From the viewpoint of attractive force, it is desirable that the direction of magnetization of the magnet is from the inner circumference to the outer circumference or vice versa. Note that instead of molding a ring-shaped ferromagnetic material, ferromagnetic powder may be embedded.

FIG. 3 is a diagram for explaining the mutual relationship when the optical disc recording medium according to the present invention is inserted into a disc drive, and (a) of FIG. This is a diagram showing the state, as shown in Figure 3 (
b) is a diagram showing a rotatable state. In FIGS. 3(a) and (b), 31 is a motor, 32 is a spindle,
A flange 33 regulates the position of the optical disk 1 in the height direction (in the axial direction of the motor), and is made of a ferromagnetic material inside or in its entirety. 34 is the spindle center, and the hub 12
The center hole 13 of the optical disc 1 is fitted to determine the center of the optical disc 1. A loading mechanism 35 has a function of automatically loading the optical disc 1 onto the spindle 32 of the disc drive when a user pushes an optical disc recording medium into the disc drive.

36 is a case holder within the loading mechanism 35.

Although the mechanism is omitted in FIG. 3, the loading mechanism 35 has the function of transporting the case holder 36 in the front-rear direction to align the center of the optical disc 1 with the spindle center 34, and the function of transporting the optical disc 1 in the front-rear direction after centering.
It has a vertical transfer function for attaching to the case 2 held by the case holder 36, and is electrically actuated based on an input, a manual switch operation, or a command from the host. The optical disc 1 can be attached to the flange 33.

Next, the operation of the optical disc recording medium in the disc drive according to the present invention will be explained with reference to FIG.

First, as shown in FIG. 3(a), immediately after the optical disc 1 is inserted into the disc drive, the optical disc 1 is positioned directly above the spindle 32 by the loading mechanism 35. As shown in FIG. At this time, the optical disk 1 is still attracted to the case 2 by the magnetic attraction force.

Next, the case holder 36 is loaded by the loading mechanism 35.
When the disk moves downward, the disk center hole 13 first fits into the spindle center 34, and the hub 12 fits into the flange 33.
At the same time, it is fixed by magnetic force.

Furthermore, when the case 2 is lowered together with the case holder 36, the case 2 and the optical disc 1 are separated, and a gap is formed between the slope 14 and the case slope 24, as shown in FIG. 3(b). In this state, the disk drive motor 31
begins to rotate, and the operation of writing and reading information to and from the optical disc 1 is started.

When the information write/read operation is completed, the disk drive starts an unloading operation by a manual switch operation or by a command from the host. As a result, the loading mechanism 35 begins to rise,
After the case slope 24 comes into contact with the slope 14 of the hub 12 of the optical disc 1, the optical disc 1 is separated from the flange 33 surface. At the same time, the optical disk 1 is fixed to the case 2 by the attraction force of the ferromagnetic portion 25 of the case slope 24.

After the lifting operation by a predetermined amount, the loading mechanism 35 performs a movement operation in the left-right direction and carries out the optical disc recording medium to the outside of the disc drive.

Note that it is desirable to house the optical disc recording medium according to the present invention in a thin carrying case made of paper or plastic from the viewpoint of protecting the medium from dust and scratches.

(Effects of the Invention) As explained above, according to the optical disc recording medium according to the present invention, the following effects can be obtained. That is, (1) rotating an optical disk having a recording film to record and reproduce;
Since it can be used in the same way as a so-called normal optical disc, it can increase storage capacity, access speed, and information transfer speed. ■Since one side of the case is open, the thickness of the case is approximately 50% greater than the thickness of the disc. It is thin and about the same thickness as a credit card calculator, making it convenient to carry. ■The optical disc is attracted to the case by the magnetic force around the hub, so even if the case is turned upside down, the optical disc will not fall out, and the - It can be handled like a card, ■The recording side faces the inner surface of the case, so it won't get scratched, and it is highly effective in protecting against dirt and dust.It has extremely great practical effects.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing one embodiment of an optical disc recording medium according to the present invention, and FIG. 2 is a sectional view for explaining details of the structure of the optical disc recording medium according to the present invention.
(a) of the figure is a cross-sectional view of the disk taken along line A-A in the viewing direction in (a) of Figure 1, and (b) of the m2 figure is B in (b) of Figure 1.
FIG. 3 is a sectional view of the case in the viewing direction along line -B, and is a diagram for explaining the mutual relationship when the optical disc recording medium according to the present invention is inserted into a disc drive. In the figure, 1... optical disk, 11... recording film, 12...
... hub, 13... center hole, 14... slope formed on the outer periphery of the hub 12, 15... ring-shaped soft magnetic material part provided along the outer periphery of the hub 12, 2 ...Case, 21...Disc storage section (recess), 22...
Relief, 23...Case center hole (through hole), 24...
- Case slope, 31...Motor, 32...Spindle, 33...Flange that regulates the position of the optical disc in the height direction (motor axial direction), 34...Spindle center, 35...Loading mechanism , 6...Case holder. Patent applicant Nippon Telegraph and Telephone Corporation

Claims (1)

[Scope of Claims] An optical disc having a recording film on one side and having a hub in the center thereof that connects to a drive unit of an optical disc drive mechanism; and an optical disc having a recess for storing the optical disc on one side; It consists of a card-like case with a through hole in the center of the recess into which the hub fits, and the through hole of the case has a slope, and a ferromagnetic ring or magnetic powder is embedded in the slope. . An optical disc recording medium, wherein the hub has a slope facing the case slope, and is at least partially formed of a soft magnetic material or at least partially mixed with soft magnetic powder.