JP2003091815A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the consumption of a resin material, the amount of dust and cost for manufacturing and transporting a recording disk in a manufacturing stage for the recording disk while the compatibility with a DVD (registered mark) is maintained. SOLUTION: A thin and circular optical disk 101 is sandwiched by transparent table 1 formed in a disk shape and a pressing plate 5 and rotated by a spindle mortar 2. An optical pickup device 8 performs recording and reproduction to/from the optical disk 101 through the transparent table 1. The transparent table 1 consists of polycarbonate resin and has 0.6 mm thickness from the surface thereof to a signal recording surface of the optical disk 101.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device for writing or reading an information signal on a recording disc which is an optical recording medium.

[0002]

2. Description of the Related Art Conventionally, a recording disc such as a so-called optical disc has been proposed, and as such an optical disc, a so-called "DVD (recording medium for software such as computer programs, images, music, etc., which is created by a stamper, (Registered trademark) "is proposed.

Such an optical disc has the advantage that the same one can be manufactured in a large amount in a short time and the manufacturing cost is low, but since it is manufactured and consumed in a large amount, it can be further miniaturized (thinned, It is desired to reduce the diameter and reduce the manufacturing and transportation costs.

Further, when manufactured in large quantities, since a large amount of polycarbonate resin is used as a material, a large amount of resources are consumed and at the same time a large amount of dust is generated. From such a viewpoint, in order to reduce the amount of resin material required and to reduce the manufacturing and transportation costs, an optical disk thinner than before, for example, a thickness of about 0.3 mm to 0.5 mm. Is proposed. Such optical discs are disclosed, for example, in Japanese Patent Laid-Open Nos. 6-60423, 10-308059, and 11-2.
No. 13471 gazette.

[0005]

By the way, the above-mentioned thinner optical discs are used for optical discs such as "CD (registered trademark)" and "DVD (registered trademark)" which have been used so far. In the optical disc device, the recording and reproduction cannot be performed as it is, and a dedicated optical disc device is required.

[0006] In this, the "CD
Both (registered trademark) and “DVD (registered trademark)” optical disc devices and optical disc devices for thin optical discs must be used, which is complicated.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and has been used so far in "DV".
D (registered trademark) compatibility can be maintained, the amount of resin material used in the manufacturing process of the recording disk can be reduced, the amount of dust can be reduced, and the manufacturing and transportation costs of the recording disk can be reduced. The present invention intends to provide an optical disk device that can also be realized.

[0008]

In order to solve the above-mentioned problems, an optical disk device according to the present invention is provided with a disk having a disk-shaped recording disk having a signal recording layer, the disk having a diameter at least larger than that of the recording disk. -Shaped transparent table, a recording disk placed on the transparent table in cooperation with the transparent table, and a disc-shaped pressing plate having a diameter larger than at least the recording disk, and the transparent table and the pressing plate are rotated. It is characterized in that it is provided with an operating spindle motor and an optical pickup device for writing or reading an information signal through the transparent table with respect to a recording disk sandwiched between the transparent table and the pressing plate. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[1] Overview of Optical Disk Device As shown in FIG. 1, the optical disk device according to the present invention has a disk-shaped recording disk 101 having a signal recording layer and at least a larger diameter than the recording disk 101. It has a disk-shaped transparent table 1. This transparent table 1
Is formed of a polycarbonate resin material which is the same material as the disk base material of the recording disk 101, and the central portion thereof is supported by the drive shaft 3 of the spindle motor 2 via a hub member 4. .

As shown in FIGS. 2 and 3, this optical disk device has a diameter larger than at least the recording disk 101 sandwiching the recording disk 101 placed on the transparent table 1 in cooperation with the transparent table 1. It has a disc-shaped holding plate 5. As shown in FIG. 1, the pressing plate 5 attracts the metal plate 7 attached to the central portion of the hub member 4 by a magnet 6 provided in the central portion,
The recording disk 101 on the transparent table 1 is sandwiched together with the transparent table 1 by being biased toward the transparent table 1.

The spindle motor 2 has a recording disk 10 in which a transparent table 1 and a pressing plate 5 are sandwiched between them.
Rotate with 1.

The optical disk device has a recording disk 101 sandwiched between the transparent table 1 and the pressing plate 5.
On the other hand, an optical pickup device 8 for writing or reading information signals is provided through the transparent table 1.

[2] Recording Disc As shown in FIG. 4, the recording disc 101 has an outer diameter of 80 m.
m or 120 mm disk-shaped with an inner diameter of 15
It has a central hole of mm. This recording disk 101
As shown in FIG. 5, as in the so-called “DVD-ROM” disc, the light-transmitting layer 102 made of transparent polycarbonate resin, the reflection film 103 made of aluminum,
It has a structure in which a protective film 104 made of an ultraviolet (UV) curable resin or the like is laminated. One surface of the light transmitting layer 102 is a flat surface on which light is incident, and the other surface is a surface on which embossed pits representing data contents are formed. The signal recording surface (reflection film) 103 and the protective film 10 are formed on the surface where the embossed pits are formed.
4 are laminated and deposited. The shape and data format of the embossed pits are the same as the format used in the "DVD-ROM".

The thickness of this recording disk 101 is 0.0
The thickness is 5 mm to 0.3 mm, and in this embodiment, it is 0.1 mm. This recording disk 101 is a “DVD-ROM” which has been used conventionally.
By making it 0.9 mm to 1.15 mm thinner than the disc, the amount of polycarbonate resin used for manufacturing can be significantly reduced (about 76% to 96% reduction), material cost is reduced, and weight is reduced. To reduce transportation costs,
In addition, the amount of dust generated can be reduced.

Further, the recording disk 101 has flexibility by reducing the thickness. Therefore, the recording disk 101 is less likely to be damaged even when the packaging condition is not good, for example, when the recording disk 101 is distributed between magazines as a magazine appendix.

[3] Transparent Table And, as shown in FIGS. 2 and 3, the transparent table 1 has a disk shape having an outer diameter of, for example, about 120 mm and a thickness of 0.3 mm to 0.55 mm. Is formed in. In this embodiment, as shown in FIG. 6, the transparent table 1 has a thickness of 0.5 mm, and the total thickness of the transparent table 1 and the recording disk 101 is 0.6 mm. The thickness of the transparent table 1 is determined according to the thickness of the recording disc 101. In any case, the total thickness of the transparent table 1 and the recording disc 101 is 0.
It should be 6 mm.

[4] Optical Pickup Device As shown in FIG. 1, the optical pickup device includes a light emitting and receiving composite element 9 including a light emitting element (semiconductor laser) and a light receiving element, and a light receiving and emitting composite element 9. The objective lens 10 that focuses the emitted laser beam on the signal recording surface 103 of the recording disk 101 is configured. The objective lens 10 is supported by a biaxial actuator 11 and can be moved in the optical axis direction and in a direction orthogonal to the optical axis.

The optical system of the optical pickup device 8 is
Transparent table 1 and transparent layer 102 of recording disc 101
It is designed so that the light flux can be condensed on the signal recording surface 103 through a transparent layer having a thickness of 0.6 mm.

The optical pickup device 8 is
The light beam reflected by the signal recording surface 103 is received by the light receiving element of the light emitting and receiving composite element 9 via the objective lens 10. Based on the light detection output of this light receiving element, a read signal (RF signal) of an information signal from the recording disk 101,
Various error signals (focus error signal and tracking error signal) can be generated.

[5] Control Circuit and Modulation / Demodulation Circuit In this optical disc device, the spindle motor 2 and the optical pickup device 8 are controlled and operated by the control circuit 13. The spindle motor 2 has a circuit board 12
Is connected to a control circuit 13 through which the rotation start and stop and the rotation speed are controlled. The optical pickup device 8 controls the light emission and extinction of the light emitting element (semiconductor laser) and the light emission output, and
The axis actuator 11 is controlled.

The control of the biaxial actuator 11 is based on the output signal from the optical pickup device 8.
Based on the focus error signal and the tracking error signal generated in 3, the position of the objective lens 10 in the optical axis direction (focus direction) and the position of the recording disk 101 in the radial direction (tracking direction) are determined.

The output signal from the optical pickup device 8 is sent to the modulation / demodulation circuit 14, and the recording disk 1
It is demodulated as a reproduction signal from 01 and output to the outside. When recording on the recording disk 101, a signal input from the outside is modulated by the modulation / demodulation circuit 14 and sent to the optical pickup device 8. Based on the signal thus modulated, for example, the light emission output of the light emitting element is modulated to record the information signal on the recording disk 101. The modulation / demodulation circuit 14 is also controlled by the control circuit 13.

[6] Operation of Optical Disc Device Next, the reason why the recording disc 101 can be reproduced in the optical disc device according to the present invention like the conventional “DVD-ROM” will be described. Conventional "DVD-RO
M ”means that, as shown in FIG.
It has a structure in which a protective film 112 made of an ultraviolet (UV) curable resin, a reflective film 111 made of aluminum (a signal recording surface) and a light transmission layer 110 made of a polycarbonate resin are laminated. Each thickness is 0.6 mm. Therefore, "DVD
The "ROM" as a whole is configured as a bonded disk having a thickness of 1.2 m. This "DVD-RO
The optical system for reproducing the information signal from "M" has a thickness of 0.
It is designed to read the information signal on the reflective film 111 through the 6 mm light transmitting layer 110.

In the optical disk device according to the present invention, as shown in FIG. 6, the recording disk 101 is sandwiched between the transparent table 1 and the pressing plate 5, and the pressing plate 5, the protective film 104, the reflective film 103, It has a structure in which the light transmitting layer 102 and the transparent table 1 are laminated. In order to read an information signal from this recording disk 101 by the same optical system as that for "DVD-ROM", the thickness of the transparent layer including the transparent table 1 and the light transmitting layer 102 is "DVD-ROM". Must be 0.6 mm as well. In this optical recording medium, as shown in FIG. 6, the light beam focused by the objective lens 10 of the optical pickup device passes through the transparent table 1 and the recording disc 101.
The light is transmitted through the light transmission layer 102 and is focused on the embossed pits on the reflection film 103. The thickness of the transparent table 1 where the light flux passes is 0.5 mm.
In addition to the thickness of 0.1 mm of the light transmission layer 102 of 0.1,
It will be 6 mm. This is the same thickness as the light transmitting layer 110 of the "DVD-ROM" disc. Since the transparent table 1 is also made of the same transparent polycarbonate resin as the light transmission layer 102 of the recording disk 101, the optical condition is "D".
This is the same as the light transmission layer 110 of the "VD-ROM" disk, and the information signal can be read by the optical system for "DVD-ROM".

The pressing plate 5 is a "DVD-ROM".
It corresponds to the disc base material 113 in the disc. The pressing plate 5 has a thickness of 0.6 mm, and the total thickness from the transparent table 1 to the pressing plate 5 is 1.2 mm. This is the same as the total thickness of a "DVD-ROM" disc.

Further, the transparent table 1 and the pressing plate 5 sandwiching the recording disk 101 have the outer diameter of 120 mm and the inner diameter of the central hole of 15 like the "DVD-ROM" disk.
The size is mm, and the external shape can be handled in the same manner as a “DVD-ROM”. The transparent table 1 and the pressing plate 5 are also within the standard of the "DVD-ROM" disk in terms of the weight, inertia, and weight balance as a whole. Since the shape of the embossed pits on the reflective film 103 of the recording disk 101 and the data format are the same as those of the "DVD-ROM" disk, the processing of the read data is different from that of the "DVD-ROM". You can do the same.

That is, in this optical disk device, if the transparent table 1 and the pressing plate 5 are detachable, the "DVD-ROM" can be reproduced with the transparent table 1 and the pressing plate 5 removed, and these transparent Recording disk 1 if table 1 and pressing plate 5 are attached
Since 01 can be recorded and reproduced, compatibility with "DVD-ROM" can be maintained.

In this optical disk device,
If the user has one set of the transparent table 1 and the pressing plate 5, the user can exchange and mount a plurality of recording disks 101 to perform recording and reproduction of each recording disk 101. That is, in this optical disk device, it is possible to significantly reduce the amount of the resin material used as the material of the recording disk while ensuring compatibility with the conventional "DVD-ROM" disk.

Although the thickness of the recording disk 101 is 0.1 mm and the thickness of the transparent table 1 is 0.5 mm in the above-mentioned embodiment, the optical disk device according to the present invention uses these numerical values. The transparent table 1 and the light transmission layer 102 of the recording disk 101 are not limited to these.
It suffices that the total thickness is 0.6 mm.

In the above embodiment, the recording disk 101 is compatible with the "DVD-ROM", but in this optical recording medium, the recording disk is a so-called "DVD-R" disk. Or "DV
The D-RW "disc may be compatible. In this case, as shown in FIG. 7, the recording disk 105 has an outer diameter of 80 mm or 120 mm.
Is formed into a disk shape having a center hole with an inner diameter of 15 mm,
As shown in FIG. 8, the light transmitting layer 1 of polycarbonate resin
06, recording film 107, reflection film 108 and ultraviolet rays (UV)
A protective film 109 made of a curable resin is laminated and configured.

To maintain compatibility with the "DVD-R" disc, a dye-based recording film is used as the recording film 107 and gold is used as the reflective film 108. Also, "DVD
To maintain compatibility with the “-RW” disc, a layer-change recording film is used as the recording film 107 and aluminum is used as the reflective film 108. In addition, these "DVD-
In the case of maintaining the compatibility with the "R" disk or the "DVD-RW" disk, in the case of maintaining the compatibility with the "DVD-ROM" disk, embossed pits in which data is recorded on one surface of the light transmitting layer 102. The presence of such embossed pits does not exist, and the light transmission layer 1
A groove called a group is formed on one surface of 06. The shape of the groove and the data format conform to the standards of the "DVD-R" disc and the "DVD-RW" disc, respectively.

These recording discs 105, when sandwiched between the transparent table 1 and the pressing plate 5, have a "DVD-R" disc or a "DVD-RW" with respect to their outer shape and the like.
Since it is the same as the disc, the optical disc device according to the present invention is configured as a device having the same optical system and signal processing system as the optical disc device for the “DVD-R” disc and the optical disc device for the “DVD-RW” disc. By doing so, the information signal can be reproduced.

[0034]

As described above, in the optical disk device according to the present invention, the recording disk sandwiched between the disk-shaped transparent table and the pressing plate is transmitted through the transparent table, and the optical pickup device outputs the information signal. Writing or reading is performed.

Since the recording disk used in this optical disk device can be made thinner than the conventional "DVD (registered trademark)" disk, compatibility with this "DVD (registered trademark)" is maintained. , The amount of polycarbonate resin used as a material can be significantly reduced,
It is possible to conserve resources and reduce the amount of waste generated.

Since the recording disc is thin, it has flexibility and is not easily damaged. When this recording disk is used, the recording disk is sandwiched by the transparent table and the pressing plate to have a flat shape, so that the flatness allowable range required at the time of manufacture is wide.

That is, the present invention can maintain compatibility with the "DVD (registered trademark)" that has been used so far, reduces the amount of resin material used in the manufacturing process of a recording disk, and reduces the amount of dust generated. Therefore, it is possible to provide an optical disc device which can reduce the manufacturing cost and the transportation cost of the recording disc.

[Brief description of drawings]

FIG. 1 is a side view showing a structure of an optical disk device according to the present invention with a part thereof cut away.

FIG. 2 is a side view showing a configuration of a main part when a recording disc is mounted on the optical disc device.

FIG. 3 is a side view showing a configuration of a main part when a recording disc is mounted on the optical disc device.

FIG. 4 is a plan view showing a configuration of a recording disc used in the optical disc device.

FIG. 5 is a vertical cross-sectional view showing the structure of the recording disk.

FIG. 6 is a vertical cross-sectional view showing a state where a recording disc is being reproduced in the optical disc device according to the present invention.

FIG. 7 is a plan view showing another example of a recording disk used in the optical disk device according to the present invention.

8 is a vertical cross-sectional view showing the structure of the recording disk shown in FIG.

FIG. 9 is a vertical cross-sectional view showing a state of reproducing a “DVD-ROM” disc.

[Explanation of symbols]

1 transparent table, 2 spindle motor, 5 pressing plate, 8 optical pickup device, 13 control circuit, 10
1,105 recording disc,

Claims (6)

[Claims] 1. A transparent disk-shaped disc on which a disk-shaped recording disc having a signal recording layer is mounted, and a recording disk mounted on the transparent table are transparent. A disc-shaped pressing plate having a diameter larger than that of at least the recording disk sandwiched in cooperation with the table, a spindle motor for rotating the transparent table and the pressing plate, and a transparent table and the pressing plate. An optical pickup device comprising: an optical pickup device for writing or reading an information signal through a transparent table on a recording disc. 2. The transparent table is formed of a polycarbonate resin, and the thickness of the transparent layer from the surface of the transparent table on the optical pickup device side to the signal recording surface of a recording disc mounted on the transparent table is: 0.6 m
2. The optical disk device according to claim 1, wherein the number is m. 3. A recording disk comprising a transparent disk substrate coated with a signal recording layer is used, and the recording disk has a thickness of 0.05 m.
3. The optical disk device according to claim 2, wherein the thickness is m to 0.3 mm. 4. The optical recording medium according to claim 2, wherein the diameter of the recording disk is 80 mm. 5. The optical recording medium according to claim 2, wherein the diameter of the recording disk is 120 mm. 6. The transparent table, the recording disk and the pressing plate have a total thickness of 1.185 mm ± 0.04.
5 mm, and their total weight is 13 g to 20
3. The optical disk device according to claim ² , wherein g, total inertia is 0.04 gm ² or less, and total dynamic balance is 0.01 gm or less.