JPH04310682A - Optical disk cartridge and optical disk driving device - Google Patents

Abstract

PURPOSE:To perform the stable tracking control simultaneously onto the both surfaces for an optical disk equipped with an information recording surface at both surfaces. CONSTITUTION:In an optical disk cartridge 1, two optical disks 102 having an information recording surface on one side surface are stored in a case body respectively independently rotatably, an optical disk driving device 2 is equipped with 2 sets of a turn table 206 and a optical pick-up, and by respective sets of the turn table 206 and the optical pick-up, 2 optical disks 102 are driven and accessed respectively independently. Since the eccentric quantity of the rotation shaft can be lessened for each information recording surface, the stable tracking control can be simultaneously performed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc cartridge and an optical disc drive device.

0002

2. Description of the Related Art Optical disk devices are often used in which a cartridge containing an optical disk, which is an information storage medium, can be attached to and removed from an optical disk drive device at will.

Some optical disks have recording tracks, ie, information recording surfaces, on both sides. Such a double-sided type disc is made by bonding two optical disc substrates each having an information recording surface formed on one surface to the other surface. During this bonding, it is difficult to accurately align the centers of the tracks on each information recording surface, resulting in some deviation. For this reason, in the case of a double-sided optical disc, each information recording surface is provided with a hub mechanism, and these hub mechanisms are placed precisely at the center of each track.

[0004]The optical disc drive device rotates the optical disc with almost no eccentricity by chucking the hub mechanism on either side of the disc onto the turntable as needed.

By the way, for example, Japanese Patent Application Laid-Open No. 2-16543
As seen in Japanese Patent No. 9, an optical disc has been proposed in which each information recording surface is accessed simultaneously while the optical disc is driven by one hub mechanism.

[0006]

[Problem to be solved by the invention] However, when accessing each information recording surface simultaneously as in this proposal,
When using a normal optical disc made by bonding two optical disc substrates together, a large eccentricity occurs on one information recording surface.

[0007] When an optical disc drive device accesses the information recording surface of an optical disc, tracking control is performed to cause a laser beam emitted from an optical pickup to follow the displacement of the track position due to eccentricity. However,
The accuracy of this tracking control decreases and becomes unstable as the amount of eccentricity increases.

[0008] Therefore, as proposed above, when two information recording surfaces are accessed at the same time, there is a problem in that the amount of eccentricity becomes large, making it impossible to perform stable tracking control.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide an optical disc cartridge and an optical disc drive device that can simultaneously perform stable tracking control on a plurality of information recording surfaces.

0010

[Means for Solving the Problem] To this end, the optical disc cartridge of the present invention accommodates a plurality of optical discs each having an information recording surface on one side in a case so as to be rotatable independently, and each optical disc has an optical disc. A hub mechanism for chucking is attached to each turntable on the drive device side.

[0011] Furthermore, the optical disc drive device of the present invention has two optical discs, and the optical disc cartridge is housed in parallel with each information recording surface facing outward. On the other hand, one turntable and one optical pickup are placed facing each other, and the turntable and optical pickup
Each of the optical discs is driven and accessed independently.

0012

According to the above-mentioned optical disc cartridge, a plurality of optical discs are chucked onto separate turntables and driven, so that the rotation axis can be accurately aligned with the center of each track. Thereby, stable tracking control can be performed simultaneously on a plurality of information recording surfaces.

Furthermore, according to the above optical disc drive device, since two optical discs are chucked onto separate turntables and driven, stable tracking control can be performed in the same way as described above. Also, in this case,
As in the past, the optical disc is controlled from the target positions on both sides of the case body of the optical disc cartridge, so the optical disc cartridge can be used in the same manner as in the past, such as by turning it over and installing it as necessary.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an external perspective view of an optical disc cartridge according to an embodiment of the present invention, and FIG. 2 shows a sectional view thereof. In the figure, an optical disc cartridge 1 houses two optical discs 102 in a rectangular plate-shaped case body 101. Both sides of the case body 101 have an opening 1 of a constant width from the center to one side.
01a is formed, and a shutter 103 is formed in that portion.
is installed. This shutter 103 is connected to the case body 1
The case body 101 is slidably attached along one side of the case body 101, and the case body 101 is opened and closed by sliding. Slightly depressed recesses 101b are formed on other side portions of the case body 101.

A protruding partition portion 101c is formed on the inner surface of the case body 101. This partition portion 101c is located between two optical discs 102, and is located between two optical discs 102.
02 comrades are prevented from coming into contact with each other. optical disc 10
2 each have an information recording surface 102a on one outer surface.

A hub 10 is located at the center of the optical disk 102.
21 is fixed. This hub 1021 is chucked to a turntable on the optical disc drive side, and has a center hole 1021a bored in its center.

FIG. 3 shows a schematic side view of the main parts of an optical disk drive device according to an embodiment of the present invention. In the figure, an optical disc drive device 2 is equipped with an optical disc cartridge 1 as required, and a lower chassis 201 and an upper chassis 202, which serve as bases for attachment parts, are disposed inside the device. On the lower chassis 201, a spindle motor 203 and a moving optical section 204 and a fixed optical section 205, which constitute an optical pickup, are arranged.

The spindle motor 203 is connected to the lower chassis 2.
01, and a turntable 20 is attached to its rotation axis.
6 is installed. The upper surface of the turntable 206 is recessed, and a permanent magnet 2061 is fixed to the recessed portion. The moving optical unit 204 is attached to the lower chassis 201 so as to slide linearly thereon. The fixed optical section 205 is housed within a case body formed in the lower chassis 201.

A guide shaft 207 is fixed to the upper part of the case body of the fixed optical section 205. A hole 202a is bored in the upper chassis 202.
2a and the guide shaft 207 are fitted together. This causes the upper chassis 202 to move up and down.

A moving optical section 208 and a spindle motor 209 are arranged on the lower surface of the upper chassis 202. The moving optical section 208, similar to the above moving optical section 204,
It constitutes an optical pickup together with the fixed optical section 205, and is attached so as to slide linearly. Similarly, the spindle motor 209 is connected to the upper chassis 20.
2, and a turntable 210 is attached to its rotation axis.
is fixed. A permanent magnet 2011 is attached to the bottom surface of the turntable 210.

Although not shown, the moving optical section 20
Seek device for moving 4,208, upper chassis 202
A driving device for moving the optical disc cartridge 1, and a loading device for moving the optical disc cartridge 1 inserted from the outside to a predetermined position and pushing it out to a predetermined position when removing the optical disc cartridge 1 are provided.

With the above configuration, next, the operation of the optical disc drive device 2 of this embodiment will be explained.

[0024] When the optical disc drive device 2 does not have the optical disc cartridge 1 installed, the upper chassis 2
02 has moved upward, and the distance between turntables 206 and 210 has become wider.

Now, assume that the operator inserts the optical disc cartridge 1 into an insertion slot (not shown) of the optical disc drive device 2. Then, the loading device (not shown)
This is detected and the optical disc cartridge 1 is transported to a predetermined position. During this transportation, the opening 101a of the optical disc cartridge 1 opens. And turntable 2
The hub 1021 of the optical disc 102 is placed on the optical disc 06. At this time, the shaft of the spindle motor 203 is inserted into the center hole 1021a.
At the same time, the permanent magnet 2061 attracts the hub 1021.

Next, the upper chassis 202 is driven downward, and as shown in FIG. 4, the turntable 210 is fitted into the hub 1021 of the other optical disk 102 in the same manner as described above. As a result, the two optical discs 102 are chucked onto the turntable 206 and the turntable 210, respectively.

After this, the spindle motors 203 and 209
is activated, and the two optical disks 102 rotate. Then, the moving optical sections 204 and 208 are driven to a predetermined track position, and the fixed optical section 205 emits a laser beam. The laser light emitted from the fixed optical section 205 is irradiated onto the optical disk 102 via the moving optical sections 204 and 208. Further, the laser beam reflected on the optical disk 102 is transmitted to the fixed optical section 2 via the opposite route to that described above.
It is incident on 05. The fixed optical section 205 records information on the optical disc 102 using emitted laser light, and reads recorded information using an incident laser light.

Next, assume that the operator performs an eject operation using an operation section (not shown).

In this case, the optical pickup stops operating, the spindle motors 203 and 209 stop rotating, and the upper chassis 202 moves upward as shown in FIG. Then, the loading device ejects the optical disc cartridge 1 to the insertion slot.

As described above, in this embodiment, the optical disc cartridge 1 stores the two optical discs 102 with the information recording surface 102a facing outward, and the optical disc drive device 2 stores the two optical discs 102 with the information recording surface 102a facing outward. The turntables 206 and 210 are driven separately.

In this case, the hub 10 on the optical disk 102 side
21 and the turntables 206, 210 can be accurately aligned because they only need to be aligned with the center of the track on one information recording surface. As a result, the optical disc 1
The amount of eccentricity during rotation of the optical disc 102 is reduced, and stable tracking control can be performed simultaneously on the two optical discs 102.

Furthermore, since the turntables 206 and 210 and the moving optics 204 and 208 are disposed at opposite positions on both sides of the optical disc cartridge 1, they can be used in the same manner as conventional methods, such as by turning the optical disc cartridge upside down and installing it. can do.

Furthermore, when the optical disk cartridge 1 is attached or removed, the turntable 210 and the moving optical section 208 are moved upward, so there are no obstacles when the optical disk cartridge 1 is inserted or removed. The optical disc cartridge 1 can be easily transported by the loading device.

Furthermore, in the case body 101 of the optical disc cartridge 1, the two optical discs 102 are separated by the partition portion 101c, so that the optical discs 10
2 can be prevented from coming into contact with each other and being damaged.

In the above-described embodiment, the optical disc cartridge accommodates two optical discs, but if three or more discs are accommodated and the necessary openings are formed on the sides, etc., the optical disc drive device can accommodate them. It is also possible to access multiple optical discs simultaneously.

Next, FIG. 5 shows an optical disc drive device according to another embodiment of the present invention. In the figure, the same reference numerals as in FIG.
The point is that it is equipped with a.

The electromagnets 2062 and 2102 rotate together with the turntable 206 or 210, and during the rotation, the two are powered by a power source E and a changeover switch SW, as shown in FIG. One of the two is selectively energized.

The optical disc cartridge 3 has a case body 3.
01 contains one optical disk 302. The optical disc 302 is made up of two optical disc substrates 3021 and 3022 each having an information recording surface formed on one side, which are glued together with the information recording surface outside, and hubs 3023 and 30 on each surface.
24 is attached.

With this configuration, the optical disc cartridge 3 is attached and detached while the upper chassis 202 is driven and the turntable 210 is moved upward, as described above.

If the optical disc cartridge 3 is now inserted, the optical disc drive device 2 transports the optical disc cartridge 3 to a predetermined position and determines which information recording surface of the optical disc 302 is to be accessed. For example, if the bottom surface of the optical disk 302 is to be accessed, the electromagnet 2062 side is energized. As a result, the hub 3024 is chucked onto the turntable 206. In this state, the optical disc drive device 2 uses the moving optical section 204 to record and reproduce information.

On the other hand, when accessing the top surface of the optical disk 302, electricity is applied to the electromagnet 2102 side. As a result, the hub 3023 is chucked onto the turntable 210. In this state, the optical disc drive device 2 uses the moving optical section 208 to record and reproduce information.

In this case, since the hubs 3023 and 3024 are arranged precisely at the center of the track on the optical disk substrate 3021 or 3022 side, stable tracking control can be performed with a small amount of eccentricity.

As described above, in this embodiment, the electromagnet 20 is used as the magnet for chucking the turntables 206 and 210.
By using the hubs 62 and 2102, the hubs 3023 or 3024 are chucked one by one to access each information recording surface.

As a result, when continuously accessing both sides of the optical disc cartridge 3, the optical disc cartridge 3
This eliminates the need for the operator to turn over and reinstall.

By the way, in the optical disc cartridge shown in FIG. 2, the partition part 101c is formed in the case body 101, but as shown in FIG. You may also do so. This separates the two optical disks 102 and prevents them from coming into contact and being damaged.

In each of the above-described embodiments, the upper chassis 202 was moved in parallel in order to widen the distance between the turntables 206 and 210. It goes without saying that the method described above may also be used.

[0047]

As described above, according to the optical disc cartridge of the present invention, a plurality of optical discs each having an information recording surface on one side are accommodated in a case body, and a hub mechanism for chucking is formed on each optical disc. Therefore, since each optical disk can be driven with a small amount of eccentricity, stable tracking control can be performed simultaneously on a plurality of information recording surfaces.

Further, according to the optical disc drive device of the present invention, two sets of turntables and an optical Since each optical disc is driven and accessed by a pickup, it is possible to simultaneously perform stable tracking control in the same way as above, but it can also be used in the same way as before, such as by installing the optical disc cartridge upside down. can do.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an optical disc cartridge according to an embodiment of the present invention.

FIG. 2 is a sectional view of the optical disc cartridge.

FIG. 3 is a schematic side view of main parts of an optical disc drive device according to an embodiment of the present invention.

FIG. 4 is a schematic side view of the main parts of the optical disc drive device with an optical disc cartridge installed.

FIG. 5 is a schematic side view of the main parts of an optical disc drive device according to another embodiment of the present invention.

FIG. 6 is a circuit diagram showing a method of energizing the electromagnet in the above embodiment.

FIG. 7 is a sectional view of an optical disc cartridge according to another embodiment of the present invention.

[Explanation of symbols]

1, 3 Optical disc cartridge 2 Optical disc drive device 101, 301 Case body 101a Opening 101c Partition 102, 302 Optical disc 102a, 102a Information recording surface 103 Shutter 201, 201 Lower chassis 202 Upper chassis 202a Hole 203, 209 Spindle motor 204, 208 Moving optical section 205 Fixed optical section 206, 210 Turntable 207 Guide shaft 1021, 3023, 3024 Hub 1021a
Center hole 1021b, 1021b Thick part 2011, 2061 Permanent magnet 2062, 2102 Electromagnet 3021, 3022 Optical disk board E Power SW Changeover switch

Claims (6)

[Claims] 1. An optical disc having a fixed hub mechanism is built in, and when the hub mechanism is mounted in an optical disc drive device, the hub mechanism is chucked to a turntable and rotated,
An optical disc cartridge whose information recording surface is accessed by an optical pickup includes a plurality of optical discs each having an information recording surface on one side, a case body housing each of the plurality of optical discs so as to be rotatable independently, and a case body that accommodates each of the plurality of optical discs so as to be rotatable independently, and a case body that accommodates each of the optical discs. An optical disc cartridge comprising: a hub mechanism that is fixed and chucked to the turntable. 2. The optical disc cartridge according to claim 1, wherein two optical discs are housed in parallel in the case body with their information recording surfaces facing outward. 3. An optical disc in which, when an optical disc cartridge is installed, an optical disc hub mechanism built into the optical disc cartridge is chucked to a turntable and driven to rotate, and an optical pickup accesses the information recording surface of the optical disc. In a drive device, a cartridge mounting means for mounting an optical disc cartridge in which two optical discs are housed in parallel in a case with their information recording surfaces facing outward; 1. An optical disk drive device comprising: a turntable and an optical pickup; and drive access means for independently driving and accessing the two optical disks using the turntable and the optical pickup. 4. Cartridge attachment/detachment means for loading and unloading the optical disk cartridge into and out of the device box, and an arrangement that widens the arrangement interval between the turntable and the optical pickup, which are arranged in pairs to face each other, when loading and unloading the optical disk cartridge. 4. The optical disc drive according to claim 3, further comprising: an interval enlarging means; and an arrangement interval reducing means for approaching the arrangement interval to a constant distance when driving the optical disc and accessing its information recording surface. Device. 5. The optical disc cartridge according to claim 2, wherein the case body includes a mechanism for preventing two optical discs from coming into contact with each other. 6. The two turntables each include an electromagnet that chucks the hub mechanism by adsorbing it, and selectively selects one of the two optical discs by turning on and off power to the electromagnet. 4. The optical disk drive device according to claim 3, further comprising control means for chucking the optical disk.