JP5134285B2 - Optical disc body - Google Patents

Description

  The present invention relates to an optical disc body, and is particularly suitable for an optical disc body including a flexible thin optical disc.

  As the information society advances and an enormous amount of information is exchanged, an optical disk device for recording a large amount of information has become widespread. Along with this, it is desired to increase the recording density of the optical disc, and a thin thin optical disc with low rigidity and flexibility has been devised.

  As a recording medium (optical disc body) provided with such a thin optical disc, there is one shown in FIG. 4 of JP-A-10-308059 (Patent Document 1). The recording medium includes a flexible optical disc, a stabilizing plate that rotates together with the optical disc, and a cartridge that houses the optical disc and the stabilizing plate.

Japanese Patent Laid-Open No. 10-308059 (FIG. 4)

However, in the recording medium of Patent Document 1, since the gap between the thin optical disk and the rotation stabilizing plate is closed at the center, the negative pressure is stably generated sufficiently between the thin optical disk 1 and the rotation stabilizing plate 2. There is a problem that it is difficult to stably suppress the surface shake of the thin optical disk. In particular, in recent optical disc apparatuses, in order to improve the recording / reproducing speed, the recording medium has been rotated at a high speed at a rotational speed close to 10000 rpm, and it is important to stably suppress the surface shake of the thin optical disc. It has become.

  An object of the present invention is to provide an optical disc body capable of stably suppressing surface wobbling of a thin optical disc even when it is rotated at a high speed by a general optical disc apparatus.

In order to achieve the above-described object, the present invention provides an optical disc body that is inserted into and removed from an optical disc device and rotated by a motor in the optical disc device, and has a flexible thin optical disc and an air A rotation stabilizing plate provided with an air hole for guiding the thin optical disc and a protective portion for protecting the thin optical disc, and the thin optical disc and the rotational stabilizing plate facing each other at a predetermined interval and held in an integrated state. And an optical disc body comprising a holding means.

A more preferable specific configuration example of the present invention is as follows.
(1) The holding means detachably holds the thin optical disk and the rotation stabilizing plate.
(2) The holding means includes a first disk holder formed of a magnet or a magnetic body fixed to the thin optical disk, and a second disk holding formed of a magnetic body or a magnet fixed to the rotation stabilizing plate. And one of the first disk holder and the second disk holder is formed of a magnet, and the other is formed of a magnetic material.
(3) A spacer for ensuring a predetermined gap between the thin optical disk and the rotation stabilizing plate is provided.
(4) The second disk holder also serves as a spacer for ensuring a predetermined gap between the thin optical disk and the rotation stabilizing plate.
(5) The holding means is constituted by means for holding the thin optical disk and the rotation stabilizing plate mechanically.
(6) The holding means includes a hinge provided on the rotation stabilizing plate and a disk holder that is rotatably attached to the hinge and presses the thin optical disk.
(7) The protective portion that was only set to the outer peripheral portion of the rotation stabilizing plate.
(8) The said protection part is a protection nail | claw formed in the multiple places of the outer peripheral edge part of the said rotation stabilization board.
(9) The thin optical disk is used in an optical disk apparatus using a red DVD optical system, and the rotation stabilizing plate is made of a transparent material having optically substantially the same properties as the base layer of the thin optical disk. That it is formed.
(10) An optical disc body having a height and an outer diameter dimension set so as to be able to be inserted into and removed from a case of the optical disc apparatus, wherein a plurality of air holes of the rotation stabilizing plate are provided inside a recording area of the thin optical disc. Was it.
(11) A mechanism for combining the thin optical disk and the rotation stabilizing plate is provided.

  According to the optical disc body of the present invention, it is possible to stably suppress the surface shake of the thin optical disc even when it is rotated at a high speed by a general optical disc apparatus.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent.
(First embodiment)
An optical disc body according to a first embodiment of the present invention will be described with reference to FIGS.

  First, the optical disc body 20 of the present embodiment will be described with reference to FIG. FIG. 1 is an exploded perspective view of an optical disc body 20 according to the first embodiment of the present invention.

  The optical disc body 20 includes a flexible thin optical disc 1, a rotation stabilizing plate 2 provided with air holes 2a, and a holding means 3 for holding the thin optical disc 1 and the rotation stabilizing plate 2 in a detachable manner. ing.

  The thin optical disk 1 is made of a transparent disk that is thin and has low rigidity and flexibility. In this embodiment, the thin optical disk 1 has recording areas formed on both the A side (the surface or the surface on the side opposite to the rotation stabilizing plate) and the B side (the back side or the surface on the rotation stabilizing plate side). It may have a recording area. A circular hole 1 a is formed in the center of the thin optical disc 1 to be held by the rotation stabilizing plate 2.

  The rotation stabilizing plate 2 is constituted by a disc having an outer diameter substantially the same as or slightly larger than the outer diameter of the thin optical disk 1. A plurality of air holes 2a are provided in the central portion of the rotation stabilizing plate 2 for guiding air to the optical disk side during rotation. When the thin optical disk 1 and the rotation stabilizing plate 2 rotate together, air flows between the thin optical disk 1 and the rotation stabilizing plate 2 from the inner peripheral side to the outer peripheral side through the air holes 2a. Due to this air flow, a negative pressure is stably generated between the thin optical disk 1 and the rotation stabilizing plate 2, and the thin optical disk 1 is stably sucked toward the rotation stabilizing plate 2. Stable rotation with no runout occurs without contact with the In other words, the air layer between the thin optical disc 1 and the rotation stabilizing plate 2 can be kept constant during the rotation of the thin optical disc 1 and the rotation stabilizing plate 2 due to the effect of the air holes 2a provided in the rotation stabilizing plate 2. In addition, surface vibration can be suppressed, and stable recording and reproduction can be performed even on the thin optical disk 1 having no rigidity.

  The effect of even one air hole 2a is obtained, but the effect can be further enhanced by providing a plurality of air holes 2a at equal intervals in the circumferential direction as in the present embodiment. 1 can be further reduced in thickness.

  Further, the air hole 2a is provided on the inner side (inner peripheral side) of the recording area of the thin optical disc 1, and this hinders the irradiation of the light of the optical system 8 to the recording area of the thin optical disc 1 through the rotation stabilizing plate 2. It is supposed not to be.

  The holding means 3 includes a first disk holder 3A and a second disk holder 3B, and holds the thin optical disk 1 and the rotation stabilizing plate 2 in a detachable and magnetic manner in a state of facing each other. Is. The first disk holder 3A is composed of a circular ring-shaped magnet, and is fixed to the center of the A surface of the thin optical disk 1 by bonding. The second disk holder 3B is formed of a circular ring-shaped magnetic body, and is fixed to the central portion of the rotation stabilizing plate 2 by adhesion. The second disc holder 3B includes a step portion 3Ba and a tapered portion 3Bb. The thin optical disk 1 is held on the rotation stabilizing plate 2 by the magnetic attractive force between the second disk holder 3B and the first disk holder 3A.

  The step portion 3Ba is for preventing the rotation stabilizing plate 2 and the thin optical disc 1 from coming into close contact with each other, and is provided at a height of about 0.1 to 0.5 mm located inside the air hole 2a. . The taper portion 3Bb having a tapered outer peripheral surface is for aligning the rotation center axis of the rotation stabilizing plate 2 and the thin optical disk 1 with the rotation center axis of the spindle motor 7 (see FIGS. 2 and 3). It is formed at the center of the portion 3Ba. A center hole 3Bc is formed at the center of the tapered portion 3Bb. The center hole 3Bc is also the center hole of the rotation stabilizing plate 2.

  The second disk holder 3B may be integrally formed at the center of the rotation stabilizing plate 2, and in this case, a magnetic material is mixed in the portion of the second disk holder 3B. Further, the first disk holder 3A may be formed of a magnetic material, and the second disk holder 3B may be formed of a magnet.

  Next, the case where the optical disc body 20 of FIG. 1 is used for the optical disc apparatus 30 using a red DVD for the optical system 8 will be described. FIG. 2 is a cross-sectional view of a state in which recording / reproduction is performed using the optical disc body 20 of FIG. 1 in the optical disc apparatus 30 using a red DVD for the optical system 8.

  The optical disk device 30 in FIG. 2 is a general optical disk device using a red DVD for the optical system 8, and rotates the optical disk at a high rotational speed close to 10,000 rpm. The optical disk device 30 includes a front panel 4, a case 5, a tray 6, a spindle motor 7, an optical system 8, a clamper 9 that fixes the thin optical disk 1, and the like.

  The front panel 4 is provided so as to cover the front opening of the case 5. The tray 6 is provided so as to be inserted into and removed from the case 5 through the tray loading / unloading opening of the front panel 4. The optical disk body 20 is set to a height and an outer diameter so that the optical disk body 20 is placed on the tray 6 and can be inserted into and removed from the case 5 in the same manner as a general optical disk.

  In the case of the optical disc apparatus 30 of FIG. 2, it is necessary to correct the optical path difference between the thin optical disc 1 and a general optical disc. The rotation stabilizing plate 2 is formed to be transparent so as to correct an optical path difference between the thin optical disc 1 and a general optical disc. Therefore, recording and reproduction can be performed by placing the optical disc body 20 on the tray 6 so that the rotation stabilizing plate 2 is placed between the thin optical disc 1 and the optical system 8.

In a state where the tray 6 is moved into the case and the thin optical disk 1 is disposed immediately above the spindle motor 7, the spindle motor 7 is moved upward, and the spindle fixed to the rotation shaft of the spindle motor 7 is the center of the thin optical disk 1. It is fitted into the hole 2a. In this state, the clamper 9 is moved downward, and the optical disc body 20 is fixed between the spindle and the clamper 9. Thereby, the thin optical disk 1 and the rotation stabilizing plate 2 are rotated with the rotation of the spindle motor 7. Due to the rotation of the thin optical disk 1 and the rotation stabilizing plate 2, the air stably flows from the inner peripheral side to the outer peripheral side through the air hole 2a between the thin optical disk 1 and the rotation stabilizing plate 2.

  The optical system 8 includes a pickup as recording / reproducing means for writing information to the thin optical disk 1. The light from the optical system 8 is transmitted through the rotation stabilizing plate 2 to the thin optical disk 1 as described above.

  Next, the case where the optical disc body 20 of FIG. 1 is used for the optical disc apparatus 30 using a blue DVD for the optical system 8 will be described. FIG. 3 is a cross-sectional view of a state in which recording / reproduction is performed using the optical disc body 20 of FIG. 1 in the optical disc apparatus 30 using blue DVD for the optical system 8.

  The optical disk device 30 shown in FIG. 3 is a general optical disk device using a blue DVD for the optical system 8 and rotates the optical disk at a high rotational speed close to 10000 rpm. In the case of this optical disk device 30, since it is not necessary to correct the optical path difference of the thin optical disk 1, the optical disk body 20 is installed on the tray 6 so that the thin optical disk 1 of the optical disk body 20 is on the optical system 8 side. Recording and playback are possible. The rotation stabilizing plate 2 does not need to be optically corrected, and therefore does not need to be made of a transparent material. Further, the air hole 2a of the rotation stabilizing plate 2 is installed in the range of the recording area of the thin optical disc 1. There is no problem.

According to the optical disk body 20 of the present embodiment, it is possible to stably suppress the surface vibration of the thin optical disk 1 even when the optical disk body 30 is rotated at a high speed.
(Second to seventh embodiments)
Next, second to seventh embodiments of the present invention will be described with reference to FIGS. 4 to 9 are exploded perspective views showing optical disc bodies according to second to seventh embodiments of the present invention. The second to seventh embodiments are different from the compared embodiments in the following points, and are basically the same as the compared embodiments in other points.
(Second Embodiment)
In the second embodiment shown in FIG. 4, a circular ring-shaped spacer 10 is arranged between the thin optical disk 1 and the rotation stabilizing plate 2 instead of the second disk holder 3B of the first embodiment. . The spacer 10 has an outer diameter smaller than the innermost peripheral radius of the recording area of the thin optical disk 1, is formed of a magnetic material having a thickness of about 0.1 to 0.5 mm, and is bonded and fixed to the rotation stabilizing plate 2. ing. By superimposing the thin optical disk 1 on the rotation stabilizing plate 2, a magnetic attractive force is generated between the first disk holder 3 </ b> A and the spacer 10, and the thin optical disk 1 can be held on the rotation stabilizing plate 2. .
(Third embodiment)
In the third embodiment shown in FIG. 5, the first disk holder 3A of the first embodiment is eliminated, and two circular ring spacers 10a and 10b are arranged instead of the second disk holder 3B. . The spacer 10 a has an outer diameter smaller than the innermost peripheral radius of the recording area of the thin optical disk 1, is formed of a magnetic material having a thickness of about 0.1 to 0.5 mm, and is bonded to the B surface of the thin optical disk 1. It is fixed. The spacer 10b has an outer diameter slightly smaller than that of the central hole of the spacer 10a, is formed of a magnet having the same thickness as the spacer 10a, and is bonded and fixed to the rotation stabilizing plate 2. By superimposing the thin optical disk 1 on the rotation stabilizing plate 2, the spacer 10b fits into the central hole of the spacer 10a, and a magnetic attractive force is generated between the spacer 10a and the spacer 10b. 2 is possible. In the third embodiment, the thickness dimension of the disk body 20 can be reduced.
(Fourth embodiment)
In the fourth embodiment shown in FIG. 6, the first disk holder 3A of the first embodiment is configured to be elliptical and divided into two parts, and the second disk holder 3B is configured by a hinge mechanism. . The second disk holder 3B is attached to the rotation stabilizing plate 2, and the first disk holder 3A divided into two is rotatably attached to the second disk holder 3B.

In order to mount the thin optical disk 1 on the rotation stabilizing plate 2, the first disk holder 3A divided into two is passed through the circular hole 1a of the thin optical disk 1 in a standing state, and then divided into two divided first disks. The 1-disc holder 3A is opened and the thin optical disc 1 is pressed at both ends of the first disc-holder 3A. Accordingly, it is possible to hold the rotation stabilizing plate 2 and the thin optical disk 1 using a mechanical holding force without using a magnetic attractive force.
(Fifth embodiment)
In the fifth embodiment shown in FIG. 7, claws 2 b that protect the thin optical disk 1 are formed at a plurality of locations on the outer peripheral end of the rotation stabilizing plate 2. The optical disk body 20 needs to have the opposite positional relationship between the thin disk 1 and the rotation stabilizing plate 2 when used in a red DVD optical system optical disk device and when used in a blue DVD optical system optical disk device. In general optical disk devices, the device may be used in a vertical position. At this time, in order to prevent the thin optical disk 1 from being peeled off from the rotation stabilizing plate 2 and being damaged, a plurality of thin optical disk peeling preventing claws 2 b are provided on the rotation stabilizing plate 2.
(Sixth embodiment)
In the sixth embodiment shown in FIG. 8, compared to the fifth embodiment, flanges 2c that cover the outer periphery of the thin optical disk 1 are formed at the outer peripheral end of the rotation stabilizing plate 2, and the flanges 2c are thin at a plurality of locations. A claw 2b for protecting the optical disc 1 is formed. By providing the flange 2c, the thin optical disk 1 can be more reliably protected.
(Seventh embodiment)
In the seventh embodiment shown in FIG. 9, a mechanism for attaching and detaching the thin optical disk 1 and the rotation stabilizing plate 2 is provided. This attachment / detachment mechanism includes a protective member 11 a for the thin optical disk 1, a rotation stabilizing plate fixing member 11 b, a thin optical disk fixing handle 11 c, a thin optical disk 1, and a fixing shaft 11 d for the rotation stabilizing plate 2. A method for attaching and detaching the thin optical disk 1 and the rotation stabilizing plate 2 is as follows.

  First, the first disk holder 3A and the thin optical disk 1 are mechanically fixed to the thin optical disk protection member 11a by a holder (not shown) connected to the thin disk fixing handle 11c. On the other hand, the rotation stabilization plate 2 is fixed to the rotation stabilization plate fixing member 11b. Here, the thin disk protecting member 11a to which the thin optical disk 1 and the first disk holder 3A are fixed, and the rotation stabilizing plate fixing member 11b to which the rotation stabilizing plate 2 is fixed, are fixed shafts 11d of the thin optical disk 1 and the rotation stabilizing plate 2. Overlapping at the position. The thin optical disk 1 and the first disk holder 3A are separated from the thin optical disk protection member 11a by rotating the thin optical disk fixing handle 11c in a state where these are overlapped. The first disk holder 3A is made of a magnetic material or a magnet. Since the second disk holder 3B made of a magnet or a magnetic material is fixed to the rotation stabilizing plate 2, the opened thin optical disk 1 and the first optical disk 1 The disk holder 3A is magnetically held by the rotation stabilizing plate 2 and the second disk holder 3B.

  When the thin optical disk 1 is separated from the rotation stabilizing plate 2, the optical disk body 20 is fixed on the rotation stabilizing plate fixing member 11b at the position of the fixed shaft 11d. Further, the thin optical disk protection member 11a is overlapped, and the thin optical disk fixing handle 11c is rotated in the reverse direction. Thus, the thin optical disk 1 and the first disk holder 3A are separated from the rotation stabilizing plate 2 and mechanically fixed to the thin optical disk protection member 11a.

  By repeating these steps, the thin optical disk 1 can be replaced without touching the thin optical disk 1 directly. Further, even if the thin optical disk protection member 11a and the rotation stabilization plate fixing member 11b have a hinge-like structure sharing one side, there is no problem in the exchange function of the thin optical disk 1 and the rotation stabilization plate 2.

1 is an exploded perspective view of an optical disc body according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a state where recording / reproduction is performed using the optical disc body of FIG. 1 in an optical disc apparatus using a red DVD as an optical system. FIG. 2 is a cross-sectional view of a state in which recording / reproduction is performed using the optical disc body of FIG. 1 in an optical disc apparatus using a blue DVD as an optical system. It is a disassembled perspective view which shows the optical disk body of 2nd Embodiment of this invention. It is a disassembled perspective view which shows the optical disk body of 3rd Embodiment of this invention. It is a disassembled perspective view which shows the optical disk body of 4th Embodiment of this invention. It is a disassembled perspective view which shows the optical disk body of 5th Embodiment of this invention. It is a disassembled perspective view which shows the optical disk body of 6th Embodiment of this invention. It is a disassembled perspective view which shows the optical disk body of 7th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Thin optical disk, 1a ... Circular hole, 2 ... Rotation stabilization board, 2a ... Air hole, 2b ... Disk protection nail, 3 ... Holding means, 3A ... 1st disk holder, 3B ... 2nd disk holder, 3Ba ... Stepped portion, 3Bb ... Tapered portion, 3Bc ... Center hole, 3 ... Disk presser, 4 ... Front panel, 5 ... Case, 6 ... Tray, 7 ... Spindle motor, 8 ... Optical pickup, 9 ... Clamper, 10, 10a, 10b DESCRIPTION OF SYMBOLS ... Spacer, 11a ... Thin optical disk protection member, 11b ... Rotation stabilization plate fixing member, 11c ... Thin optical disk fixing handle, 11d ... Fixed shaft, 20 ... Optical disk body, 30 ... Optical disk apparatus.

Claims (12)

An optical disc body that is taken in and out of the optical disc device and rotated by a motor in the optical disc device,
A flexible thin optical disk;
A rotation stabilizing plate provided with an air hole for guiding air to the optical disc side during rotation and a protective portion for protecting the thin optical disc ;
An optical disc body comprising holding means for holding the thin optical disc and the rotation stabilizing plate facing each other at a predetermined interval and holding them in an integrated state.   2. The optical disc body according to claim 1, wherein the holding means holds the thin optical disc and the rotation stabilizing plate in a detachable manner.   3. The holding means according to claim 2, wherein the holding means is a first disk holder made of a magnet or a magnetic material fixed to the thin optical disk, and a second magnetic material or a magnet fixed to the rotation stabilizing plate. An optical disk body comprising a disk holder, wherein one of the first disk holder and the second disk holder is formed of a magnet and the other is formed of a magnetic material.   3. The optical disc body according to claim 2, further comprising a spacer that secures a predetermined gap between the thin optical disc and the rotation stabilizing plate.   4. The optical disc body according to claim 3, wherein the second disc holder also serves as a spacer for ensuring a predetermined gap between the thin optical disc and the rotation stabilizing plate.   3. The optical disc body according to claim 2, wherein the holding means is configured by means for mechanically holding the thin optical disc and the rotation stabilizing plate.   7. The holding means according to claim 6, wherein the holding means includes a hinge provided on the rotation stabilizing plate, and a disk holder that is rotatably attached to the hinge and presses the thin optical disk. Optical disc body. In claim 2, the optical disc body the protective unit is characterized by digits set on the outer periphery of the rotation stabilizing plate.   9. The optical disc body according to claim 8, wherein the protective portion is a protective claw formed at a plurality of locations on an outer peripheral end portion of the rotation stabilizing plate.   3. The thin optical disk according to claim 2, wherein the thin optical disk is used in an optical disk device using a red DVD optical system, and the rotation stabilizing plate is a transparent optically having substantially the same property as the base layer of the thin optical disk. An optical disc body made of a material.   6. The optical disk body according to claim 5, wherein a height and an outer diameter dimension are set so that the optical disk apparatus can be inserted into and removed from the case, and the air hole of the rotation stabilizing plate is located inside the recording area of the thin optical disk. An optical disc body comprising a plurality of optical disc bodies.   3. The optical disc body according to claim 2, further comprising a mechanism for combining the thin optical disc and the rotation stabilizing plate.

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