JP2003016693A - Optical disk, optical disk adapter, and optical disk unit - Google Patents

Abstract

(57) [Problem] To provide an optical disk unit, an optical disk, and an optical disk adapter capable of obtaining a good signal state. An optical disk unit (1) comprising: a ring-shaped optical disk (3) having a center hole (7); and an optical disk adapter (5) mounted on the optical disk (3) and adapted to the size of a storage section of the optical disk drive. The clamp portion 9 of the central hole 7 is provided with a through hole 9a that fits into the projection 5b of the optical disk adapter 5, and the through hole 9a
The protrusion 5 and the projection 5 are fitted to each other in the axial direction of the central hole 7 of the optical disc 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc such as a CD (compact disc), an optical disc adapter, and an optical disc unit.

[0002]

2. Description of the Related Art At present, two types of CDs (compact discs), which are optical discs, having a diameter of 12 cm and so-called single CDs having a diameter of 8 cm are in widespread use. When a CD is used for reproduction and recording, it is generally used by inserting it into a single groove on a tray such as a CD player for reproducing a CD or a tray for a hard disk for reproducing and recording a CD. .

In the case of a slot-in type reproducing device, recording device, changer device or the like that does not have a tray for inserting a single CD, the outer diameter is 12
cm, inner diameter 8 cm, donut type adapter, single C
It is common to use an optical disk unit with D attached.

Most of such conventional adapters are provided with a projection claw provided on a donut-shaped adapter in order to prevent the displacement of the single CD with respect to the adapter in use, and the projection claw is a single CD. The single CD is attached to the adapter by sandwiching the outer peripheral edge thereof (for example, Japanese Utility Model Laid-Open No. 1-78371).

[0005]

However, since the projection claws sandwich the outer peripheral edge of the single CD, stress may be applied in the inner peripheral direction of the single CD, and birefringence may occur in the reflected light from the single CD. . Due to the influence of this birefringence, the intensity of the return light (reflected light) received by the light receiving element of the reproducing device or the recording device becomes uneven. In particular, it remarkably appears in a recording device having a polarizing plate in the optical system.

That is, when the unrecorded single CD is attached to the above-mentioned adapter, the birefringence of light occurs in the portion held by the protruding claw of the adapter, and the reflected signal level is lowered. Therefore, in an unrecorded single CD, the focus error signal and the track error signal are also affected by the birefringence of light,
Due to the disturbance of these signals, the reproduction accuracy such as focusing and tracking is lowered, and in the CD after recording, the recording signal amplitude is lowered and the error rate is remarkably increased, and the recording signal of the CD is disturbed. There is a problem that it will end.

Therefore, the present invention provides an optical disk and an optical disk adapter which can obtain a good signal condition.
The purpose is to provide an optical disc.

[0008]

According to a first aspect of the present invention, there is provided an optical disc having a ring shape having a central hole, and an optical disc adapter is attached to the optical disc drive so as to match the size of a storage portion of the optical disc drive. In the periphery of the central hole,
An optical disk is characterized in that a fitting section for the optical disk adapter is provided, and the fitting section is fitted in the optical disk adapter in the axial direction of the central hole of the optical disk.

According to the first aspect of the invention, the optical disk can be housed in the housing part of the optical disk drive which is larger than the optical disk by being fitted with the optical disk adapter. The optical disc is fitted to the optical disc adapter around the central hole, and by not holding the outer peripheral edge of the optical disc with protruding claws as in the conventional case,
Since stress is less likely to be applied in the radial direction of the optical disk and light birefringence due to the stress applied to the optical disk is less likely to occur, the reproduction stability and recording stability of the optical disk are improved and a good signal state can be obtained.

According to a second aspect of the invention, in the first aspect of the invention, the fitting portion is a through hole provided in the thickness direction or a recess provided on the label surface side. Is fitted to a protrusion provided on the optical disk adapter.

According to the invention of claim 2, claim 1
In addition to providing the same effect as the invention described in (1), the optical disc is fitted into the optical disc adapter by the concavity and convexity, so that stress is less likely to be applied in the radial direction of the optical disc, and the optical disc is provided with a through hole or a depression. Yes, the configuration is simple.

According to a third aspect of the present invention, in the invention according to the second aspect, a substrate having a through hole and a substrate having no through hole are bonded to each other to close one of the through holes, thereby forming a recess. It is characterized by being formed.

According to the invention described in claim 3, claim 2
In addition to the same effect as the invention described in (1), the recess can be formed by simply bonding the substrate having the through hole and the substrate having no through hole, and the recess can be formed without performing a process such as shaving the optical disk. Since it can be formed, the depression can be easily formed.

According to a fourth aspect of the present invention, there is provided an optical disk adapter, which is mounted on a ring-shaped optical disk having a central hole to fit the size of a storage portion of an optical disk drive, and in which a mating portion with the optical disk is provided. The fitted part is an optical disk adapter characterized in that the fitted part is fitted to the peripheral part of the central hole of the optical disk in the axial direction of the central hole of the optical disk.

In the invention according to the fourth aspect, the optical disk adapter is fitted into the optical disk, so that the fitted optical disk can be housed in the housing portion of the optical disk drive which is larger than the optical disk. Since the optical disk adapter is fitted to the optical disk around the center hole of the optical disk, stress is less likely to be applied in the radial direction of the optical disk, and birefringence of light due to the stress applied to the optical disk is less likely to occur. The reproduction stability and the recording stability are improved, and a good signal state can be obtained.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the fitted portion is a through hole provided in a thickness direction around a central hole of the optical disk or a label surface side of the optical disk. It is characterized in that it is a protrusion that fits into the provided recess.

In the invention described in claim 5, claim 4
In addition to providing the same effect as the invention described in, the optical disc adapter is fitted on the optical disc by concave and convex, so that stress is less likely to be applied in the radial direction of the optical disc, and only a protrusion is provided on the optical disc adapter. , The configuration is simple.

According to a sixth aspect of the present invention, there is provided an optical disc unit including a ring-shaped optical disc having a central hole and an optical disc adapter which is mounted on the optical disc and adapted to the size of the storage portion of the optical disc drive. A fitting portion for fitting the optical disk adapter is provided around the central hole of the optical disk, and a fitting portion for fitting the fitting portion of the optical disc is provided for the optical disk adapter. Is an optical disk unit characterized by being fitted to each other in the axial direction of the central hole of the optical disk.

According to the invention of claim 6, the optical disk and the optical disk adapter are fitted to each other, so that the optical disk drive is larger than the optical disk in the housing portion.
Allows storage of optical discs. Since the optical disk is fitted in the optical disk adapter around the central hole, stress is less likely to be applied in the radial direction of the optical disk, and light birefringence due to the stress applied to the optical disk is less likely to occur. The reproduction stability and recording stability are improved, and a good signal state can be obtained.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, the fitting portion of the optical disc is a hole provided in the thickness direction or a recess provided on the label surface side, and the optical disc adapter is provided. The fitted portion of is a projection that fits into a hole or a recess.

According to the invention of claim 7, claim 6
In addition to the same effects as the invention described in (1), the optical disc is fitted with the optical disc adapter by the concavity and convexity, so that stress is less likely to be applied in the radial direction of the optical disc, and the optical disc is provided with a through hole or a recess. Just provide a protrusion on the adapter for
Simple to configure.

[0022]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1
FIG. 2 is a plan view showing an optical disc unit according to an embodiment, FIG. 2 is a sectional view showing the optical disc unit of FIG. 1 in an exploded manner, (a) is a sectional view showing an optical disc adapter, and (b) is a sectional view showing the optical disc adapter. FIG. 3 is a sectional view showing an optical disc.

As shown in FIG. 1, the optical disk unit 1
Includes an optical disk 3 and an optical disk adapter (hereinafter, simply referred to as “adapter”) 5 to which the optical disk 3 is attached, and the optical disk 3 is reproduced and recorded by being stored in a storage unit of an optical disk drive (not shown). I do. In the present embodiment, the optical disc 3 is a CD-R (CD Recorder) capable of recording only once.
ble) is used. As the optical disk drive, for example, a hard disk of a personal computer or a CD player can be used.

The optical disk 3 has a ring shape and has a label surface 3a to which a label having a trade name, a standard and the like is attached, an incident surface 3b on which light from the drive is incident, and an optical disk drive. The central hole 7 through which the clamper is inserted, and the clamp portion (peripheral portion) 9 formed around the central hole 7. Through holes (fitting portions) 9 a are provided in the clamp portion 9 around the central hole 7 at 90 ° intervals.
Is formed.

In this embodiment, as shown in FIG. 2B, in the optical disc 3, the length L1 from the central hole 7 to the side edge is 40 mm (the outer diameter of the optical disc 3 is 80 mm).
The radius L2 of the central hole 7 is 7.5 mm (the diameter of the central hole 7 is 15 mm), and the diameter L3 of the through hole 9a is 2 m.
m, the length L4 from the center line M1 of the central hole 7 to the center line M2 of the through hole 9a is 10 mm (the length between the centers of the through holes 9a facing each other is 20 mm), and the thickness of the optical disk 3 is W1 is 1.2 mm.

The outer diameter of the adapter 5 is the same as that of the accommodating portion of the optical disk drive, and has a link shape. The adapter 5 is for allowing the optical disk 3 to be stored in the storage section of the optical disk drive when the storage section of the optical disk drive is larger than the optical disk 3.

That is, as described above, the outer diameter of the optical disc 3 is 8 cm (generally called a single CD),
This is mounted on the optical disc 3 so that it can be stored in the storage portion of the 12 cm size optical disc drive. The adapter 5 has a storage portion 5a into which the optical disc 3 is fitted and has a substantially rectangular cross section, and a projection (fitted portion) 5 which fits into a through hole 9a of the fitted optical disc 3.
b, and an insertion hole 5c into which the drive clamper is inserted.

The material of the adapter 5 is not particularly limited as long as it can maintain its shape.
Examples thereof include metals such as US (stainless steel), polycarbonate resins, acrylic resins, polystyrene resins, vinyl chloride resins, epoxy resins, polyester resins, and paper.

In this embodiment, as shown in FIG. 2A, in the adapter 5, the length L5 from the center of the insertion hole 5c to the side end is 60 mm (the outer diameter of the adapter 5 is 120 mm).
mm), the radius L6 of the insertion hole 5c is 8 mm (the diameter of the insertion hole 5c is 16 mm), and the width L7 of the protrusion 5b is 2 mm.
The length L8 from the center line M3 of the insertion hole 5c to the center line M4 of the protrusion 5b is 10 mm (the length between the centers of the protrusions 5b facing each other is 20 mm). The thickness W2 of the adapter 5 is 1.4 mm, the depth W3 of the storage portion 5a is 1.2 mm, and the thickness W of the bottom portion of the storage portion 5a is W.
4 is 0.2 mm, and the height W5 of the protrusion 5b is 0.5 m
m. The dimensions of each part of the optical disc 3 are not limited to the above numerical values.

Next, the operation of this embodiment will be described based on the above-mentioned configuration. When the optical disc 3 is attached to the adapter 5, the protrusion 5b of the adapter 5 and the fitting hole 9a of the optical disc 3 are fitted in the direction of the arrow (the axial direction of the central hole 7 of the optical disc 3) while the storage portion 5a of the adapter 5 is fitted. This is done by fitting the optical disk 3 into the.

The optical disk 3 is fitted to the optical disk adapter 5 at the clamp portion 9 of the central hole 7, and the outer peripheral edge of the optical disk is not held down by the protruding claws or the like as in the conventional case. Since stress is less likely to be applied in the direction and birefringence of light due to the stress applied to the optical disc 3 is less likely to occur, the reproduction stability and recording stability of the optical disc 3 are improved, and a good signal state can be obtained.

That is, this optical disk unit 1 is used as a signal evaluation device (DDU-10 manufactured by Pulstec Industrial Co., Ltd.).
As a result of confirming the reflected signal from (00), no decrease in reflectance or signal recording amplitude was observed (reproduction stability and recording stability of the optical disc 3 were improved), and a good signal was obtained.

Next, other embodiments will be described. In the description, the same parts as those described above are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 3 is a sectional view showing an optical disk according to the second embodiment. The second embodiment differs from the first embodiment in that a recess (fitting portion) 11 that fits into the protrusion 5b of the adapter 5 is provided on the label surface 3a side of the optical disc 3.

In the present embodiment, the first substrate 13 having the through holes 3c formed therein and the second substrate 15 having no through holes are bonded to each other by the ultraviolet curable adhesive, whereby the recess 11 of the optical disk 3 is formed. Is provided. The thickness of the first substrate 13, that is, the depth W6 of the recess 11 is 0.6 mm, and the thickness W7 of the second substrate 15 is 0.6. Through hole 3
c is formed on the first substrate 13 and the second substrate having no through hole
The recess 11 is formed only by bonding the substrate 15 to each other, and the recess 11 can be provided without performing processing such as shaving the optical disk, and thus the recess 11 can be easily formed.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. For example, if the through hole 9a of the optical disk 3 is 4
However, for example, two, three, five, etc. through holes 9 are formed.
The number of a formed is not particularly limited.

In this embodiment, the optical disk 3 is provided with the through hole 9a or the recess 11 and the adapter 5 is provided with the projection 5b. However, the optical disk 3 is provided with the projection and the adapter 5 is fitted to the projection of the optical disk 3. Possible through holes or depressions 11 may be provided.

In the present embodiment, the optical disk 3 is applied as the optical disk, but the present invention is not limited to this, and the CD-ROM is used as a read-only CD for a CD or a computer.
(CDRead Only Memory), a CD-RW (CD that is a rewritable CD that uses the phase change recording method.
Similar effects can be obtained when applied to an optical disk such as a rewritable) and an adapter for the optical disk.

[0039]

According to the first aspect of the invention, the optical disc is fitted to the optical disc adapter at the peripheral portion of the central hole thereof, and the outer peripheral edge of the optical disc is not held down by the protruding claws or the like unlike the conventional case. As a result, stress is less likely to be applied in the radial direction of the optical disc, and birefringence of light due to the stress applied to the optical disc is less likely to occur. Therefore, reproduction stability and recording stability of the optical disc are improved, and a good signal state can be obtained. it can.

According to the invention described in claim 2, the same effect as that of the invention described in claim 1 is obtained, and the optical disk is fitted on the optical disk adapter by the concavo-convex, so that the stress is further applied in the radial direction of the optical disk. In addition to the difficulty, the structure is simple because only through holes or depressions are provided in the optical disc.

According to the invention described in claim 3, the same effect as that of the invention described in claim 2 can be obtained, and the recess can be formed without performing a process such as shaving the optical disk. Therefore, the formation of the recess is easy. .

In the invention described in claim 4, since the optical disk adapter is fitted to the optical disk in the peripheral portion of the central hole of the optical disk, stress is less likely to be applied in the radial direction of the optical disk, and stress applied to the optical disk. Since the birefringence of the light due to is less likely to occur, the reproduction stability and the recording stability of the optical disc are improved, and a good signal state can be obtained.

According to the invention described in claim 5, the same effect as that of the invention described in claim 4 is obtained, and the optical disk adapter is fitted on the optical disk by concave and convex, so that stress is further applied in the radial direction of the optical disk. In addition to the difficulty, the structure is simple because only the protrusion is provided on the optical disk adapter.

According to the sixth aspect of the present invention, since the optical disc is fitted to the optical disc adapter at the peripheral portion of the central hole, stress is less likely to be applied in the radial direction of the optical disc. Since the birefringence of light is less likely to occur, the reproduction stability and recording stability of the optical disc are improved, and a good signal state can be obtained.

In the invention described in claim 7, the same effect as that of the invention described in claim 6 is obtained, and the optical disk is fitted in the optical disk adapter by the concavity and convexity, so that the stress is further applied in the radial direction of the optical disk. In addition, it becomes difficult, and the through hole or the recess is provided in the optical disc, and the projection is provided in the optical disc adapter, so that the configuration is simple.

[Brief description of drawings]

FIG. 1 is a plan view showing an optical disc unit according to a first embodiment.

2 is a sectional view showing the optical disk unit of FIG. 1 in an exploded manner, (a) is a sectional view showing an optical disk adapter, and (b) is a sectional view showing an optical disk.

FIG. 3 is a cross-sectional view showing an optical disc according to a second embodiment.

[Explanation of symbols]

1 Optical disk unit 3 optical disks 7 Central hole 5 Optical disk adapter 5b Protrusion (fitted part) 9 Clamp part (peripheral part) 9a Through hole (fitting part) 11 recess (fitting part) 13 First substrate (substrate with through holes) 15 Second substrate (substrate without through holes)

Claims (7)

[Claims] 1. An optical disk having a ring shape having a central hole, which is fitted with an optical disk adapter to fit the size of a storage portion of an optical disk drive, wherein an optical disk adapter is provided around the central hole. An optical disc, wherein a fitting portion is provided, and the fitting portion is fitted to an optical disk adapter in an axial direction of a central hole of the optical disk. 2. The fitting part is a through hole provided in the thickness direction or a recess provided on the label surface side, and the through hole or the recess fits into a protrusion provided on the optical disk adapter. The optical disc according to claim 1, wherein 3. The optical disk according to claim 2, wherein a substrate having a through hole and a substrate having no through hole are bonded to each other to close one of the through holes to form a recess. . 4. An optical disk adapter which is mounted on a ring-shaped optical disk having a central hole to fit the size of a storage section of an optical disk drive, wherein a section to be fitted with an optical disk is provided and the section to be fitted is provided. Is an optical disk adapter, which is fitted to the optical disk in the axial direction of the central hole of the optical disk, around the central hole of the optical disk. 5. The fitted portion is a through hole provided in the thickness direction around the central hole of the optical disc or a protrusion fitted in a recess provided on the label surface side of the optical disc. The optical disk adapter according to claim 4. 6. An optical disk unit comprising: a ring-shaped optical disk having a central hole; and an optical disk adapter mounted on the optical disk to fit the size of a storage section of an optical disk drive, the peripheral part of the central hole of the optical disk. The optical disk adapter is provided with a fitting portion with the optical disk adapter, and the optical disk adapter is provided with a fitting portion with the fitting portion of the optical disk. The fitting portion and the fitted portion are central holes of the optical disk. An optical disk unit characterized in that they are fitted to each other in the axial direction. 7. The fitting part of the optical disk is a hole provided in the thickness direction or a recess provided on the label surface side, and the fitted part of the optical disk adapter is a protrusion fitting into the hole or the recess. The optical disk unit according to claim 6, wherein