JPH07220428A - Disk adapter - Google Patents

Abstract

PURPOSE:To obtain a disk adapter which can easily mount and remove a disk, prevent the disk from being damaged, and can positively mount the disk. CONSTITUTION:A disk adapter 10 is provided with an identical outer diameter dimension of a normal size CD (12cm) and is constituted by overlapping a first ring plate 12 and a second ring plate 14 so that they can be rotated relatively. A CD pad shelf part 18 is provided at the inner-periphery edge of the disk adapter, a gear-lock nib 16 which can be elastically deformed is provided at one ring plate, and a cam guide 30 for pushing out the gear-lock nib to the inside in inner-diameter direction is provided at the other ring plate in periphery direction. With a single-size CD (8 cm) laid out in a center hole 10a of the disk adapter, the outer-periphery edge is held between the pad shelf part and the elastically deformed gear-lock nib when the second ring plate is rotated in reference to the first ring sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc adapter for arranging a single-size compact disc in the central portion thereof so that a single-size compact disc can be reproduced by a compact disc reproducing device dedicated to a normal size.

[0002]

2. Description of the Related Art Compact discs (hereinafter simply abbreviated as CD) are classified into a normal size having a diameter of 12 cm and a single size having a diameter of 8 cm. Recent CD reproducing devices are capable of reproducing both sizes of discs. However, there are some CD playback devices that can only play normal size CDs. For example, there is a CD reproducing device in which a CD is stored in each disc stocker having a plurality of storage stages and each disc in the disc stocker is selected and reproduced.

In such a CD reproducing apparatus, since a single size CD cannot be directly reproduced, it is general that this CD is attached to a so-called disk adapter and its outer diameter is changed to a normal size CD diameter which can be used. Has become. An example of this type of disk adapter is disclosed in Japanese Utility Model Laid-Open No. 1-78371. The CD adapter of this publication is a ring-shaped disc made of a flexible material having the same outer diameter as that of a normal-sized CD. The lower surface and the side surface of the CD are supported, and the upper surface of the CD is pressed by the projection claws provided at a plurality of locations on the inner peripheral portion.

Specifically, each projection claw is integrally provided on the inner peripheral portion of the disk so as to be elastically deformable. When the CD is attached to the CD adapter, the protruding claws are elastically deformed, respectively, and are placed on the disc receiving shelf and the supporting portion C.
Insert each protruding claw into the outer peripheral edge of D. And
The CD is held at the center of the disc by the elastic force of each protruding claw. When the CD is removed from the CD adapter, each projecting claw is elastically deformed and each projecting claw is released from the open peripheral edge of the CD, as in the case of mounting.

[0005]

However, in the above-mentioned CD adapter, when the CD is attached and detached, each protruding claw has to be individually operated.
I can't easily install and remove. Further, if the CD adapter is attached and detached in an unreasonable state, the outer peripheral edge of the CD may be damaged.

Further, since the CD adapter is held on the CD only by the elastic force of the projecting claw, the projecting claw may come off the outer peripheral edge of the CD when it is subjected to vibration from the outside, and the CD adapter falls off the CD. There is a risk. Further, in this CD adapter, the surface vibration of the CD adapter occurs during the reproduction of the CD, which causes unnecessary vibration. Furthermore, C
If the CD adapter is dropped in the D playback device, the dropped C
The D-adapter remains in the CD player, and the CD cannot be easily taken out, and also causes a failure of the CD player.

The present invention has been made in consideration of the above-mentioned circumstances, and an object thereof is to easily attach and detach a disc and prevent the disc from being damaged.
Moreover, it is to provide a disk adapter capable of reliably holding a disk.

[0008]

DISCLOSURE OF THE INVENTION A disk adapter according to the present invention is a disk adapter for arranging a small-diameter disk in a central portion and enabling reproduction of a small-diameter disk by a large-diameter disk reproducing device. A ring disc having the same outer diameter dimension as the disc, the first ring plate and the second ring plate being superposed so as to be relatively rotatable,
A receiving shelf portion projecting integrally from the inner peripheral edge of the ring disk over a predetermined range in the circumferential direction and supporting the outer peripheral edge of the small diameter disk when the small diameter disk is arranged in the center hole of the ring disk; And a plurality of locking claws that are integrally formed on one of the second ring plate, are spaced apart in the circumferential direction of the ring disc, and are elastically deformable radially inward toward the central hole, and integrally on the other ring plate. And a plurality of cam guides that push the corresponding locking claws radially inward when the second ring plate is rotated to a predetermined rotation position with respect to the first ring plate.

Preferably, three or more locking claws and cam guides are provided.

[0010]

According to the desk adapter described above, first, the second ring plate is rotated to the predetermined release position with respect to the first ring plate, and the small-diameter disc is placed in the central hole. The small-diameter disk arranged in the central hole is supported by the receiving shelf. In this state, each locking claw has not yet been elastically deformed inward in the radial direction.

From this state, when the second ring plate is rotated to the predetermined rotation position, that is, the locking position with respect to the first ring plate, each locking claw is pushed radially inward by the corresponding cam guide. In this state, the small-diameter disk arranged in the central hole is sandwiched between the locking claws whose outer peripheral edges are elastically deformed radially inward by the cam guide and the receiving shelf. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, there is shown a disk adapter 10 of the present invention. This desk adapter 10
It has the same outer diameter as a normal size (12 cm diameter) compact disc, and has a ring shape. A single size (8c
A compact disc (m) (hereinafter simply abbreviated as CD) can be placed.

Specifically, this disk adapter 10
As shown in FIG. 2, the first ring plate 12 and the second ring plate 12
The ring plate 14 and the ring plate 14 are rotatably overlapped with each other. These first and second ring plates 1
2, 14 are integrally formed from a material such as a synthetic resin which is lightweight and excellent in flexibility. In addition, in FIG.
Reference numeral 12a indicates a central hole of the first ring plate 12,
Reference numeral 14a indicates a central hole of the second ring plate 14.
The central hole 12a is formed larger than the central hole 14a.

More specifically, the outer diameter of the second ring plate 14 is smaller than the outer diameter of the first ring plate 12, and the outer peripheral edge and the inner peripheral edge are sandwiched from the inside and the outside. Is fitted inside. Figure 3
The first and second ring plates 12 and 14 will be described in detail with the addition of FIG.

A plurality of (for example, three) locking claws 16 are integrally formed on the inner peripheral edge of the first ring plate 12 at equal angular intervals in the circumferential direction. Each locking claw 16 is formed by cutting the inner peripheral edge of the first ring plate 12 from the central hole 12a side toward the circumferential direction side. From a different point of view, the locking claw 16 is composed of a locking block 16a and an arm portion 16b, and the locking block 16a is an arm portion 16b extending integrally from the first ring plate 12 in the circumferential direction. Is attached to the tip of. The locking block 16a has almost the same thickness as the CD, and the arm portion 16b is formed to be thinner and longer than the locking block 16a.

Further, the locking block 16 of each locking claw 16
As shown in FIGS. 3 and 5, the a is provided with a claw portion 16c on its upper surface side. The claw portion 16c extends radially inward for a predetermined length. Therefore, each locking claw 16
The elastic block of the arm portion 16b allows the locking block 16a to move radially inward.

At the inner peripheral edge of the first ring plate 12, a step in the radial direction, that is, a receiving shelf 18 is formed except the portions of the locking claws 16. The receiving rack 18 supports the outer peripheral edge (excluding the program area) of the CD arranged in the central hole 10a of the disk adapter 10. First guide portions 20 are formed on the outer sides of the receiving rack portions 18 in the radial direction. This first guide portion 20
Is positioned in the center of the receiving shelf 18 when viewed in the circumferential direction, and is bent in a key shape toward the outside in the radial direction, as shown in FIG.

Further, circumferentially elongated holes 22 are formed along the first guide portions 20 on the radially outer sides of the respective first guide portions 20, and the elongated holes 22 are formed in the first guide portions 20.
It extends longer in the circumferential direction. By providing the elongated hole 22, the portion of the first guide portion 20 can be elastically deformed in the radial direction. Further, on the outer peripheral edge of the first ring plate 12, a peripheral wall 24 extending along the outer periphery to the upper surface side is formed. A second wall extending inward in the radial direction is provided on the peripheral wall 24.
The guide portions 26 are formed at four locations in the circumferential direction so as to be separated from each other.

On the other hand, a first step portion 28 is formed on the inner peripheral edge of the second ring plate 14 and has three circumferential portions.
Notches are provided at the points. The notch serves as a cam guide 30 provided corresponding to each locking claw 16 of the first ring plate 12. Therefore, the circumferential position of each cam guide 30 corresponds to the circumferential position of each locking claw 16. Further, a step in the circumferential direction, that is, a cam surface 30a is formed at the peripheral edge portion of each cam guide 30.

A circumferential elongated hole 32 is formed further on the outer peripheral side of each cam guide 30. The elongated hole 32 extends longer than the circumferential length of the cam guide 30. By providing this long hole 32, the cam surface 30 of the cam guide 30
The portion a is elastically deformable outward in the radial direction while maintaining rigidity. A second step portion 34 is formed on the outer peripheral edge of the second ring plate 14, and notches 34a corresponding to the second guide portion of the first ring plate 12 are provided in the circumferential direction of the second step portion 34 so as to be spaced apart from each other. Has been.

Therefore, the second guide 26 of the first ring plate 12 and the notch 34 of the second ring plate 14 are formed.
The first ring plate 12 is aligned with the circumferential position with a.
The second ring plate 14 is fitted into the first ring plate 12 while each of the first guide portions 20 is expanded radially inward. Then, when the second ring plate 14 is rotated with respect to the first ring plate 12, as shown in FIG. 1, each locking claw 16 of the first ring plate 12 causes the corresponding cam guide 30 of the second ring plate 14 to move. Each is housed inside. At this time, the first step portion 28 of the second ring plate is attached to the first guide portion 20 of the first ring plate 12, and the second step portion 34 of the second ring plate is attached to the first guide portion 20.
The second guide portions 26 of the ring plate 12 are guided respectively.

A stopper pin 36 is provided so as to project downward at a predetermined position on the lower surface side of the second ring plate 14, and the first ring plate 12 has a circumferential direction at a position corresponding to the stopper pin 36. Is formed with a pin guide hole 38. When the first ring plate 12 is fitted to the second ring plate 14, the stopper pin 36
Is guided in the pin guide hole 38.
Since the stopper pin 36 is guided in the pin guide hole 38, the first ring plate 12 and the second ring plate 1
The amount of relative rotation with respect to 4 is regulated within a predetermined range.

Next, the operation of the disk adapter 10 will be described with reference to FIGS. First, align the second ring plate 14 with respect to the first ring plate 12 at a predetermined relative rotation position, that is, the release position shown in FIG.
C from the top side into the central hole 10a of the disk adapter 10
Place D (FIGS. 6 and 7).

In this state, the locking block 16a of the locking claw 16 is in the state shown in FIGS. 1 and 8, and the claw portion 16c of the locking block 16a is the first ring plate 1
It is located radially outward of the second receiving shelf portion 18.
Therefore, the CD arranged in the central hole 10a is arranged on the receiving shelf 18 of the first ring plate 12 without interfering with the claws 16c (FIGS. 8 and 9).

Next, as shown in FIG. 10, the second ring plate 14 is rotated counterclockwise with respect to the first ring plate to a predetermined rotation position, that is, a locking position as viewed in FIG. At this time, the locking block 16a is guided by the cam surface 30a of the cam guide 30, the arm portion 16b connecting the locking block 16a is elastically deformed, and the locking block 16a is pushed out inward in the radial direction. Locking block 16
When a is pushed inward in the radial direction, the claw portion 16c projects into the central hole 10a.

In this state, the disk adapter 10
The outer peripheral edge of the CD arranged in the central hole 10a is supported by the receiving shelf portion 16 of the first ring plate 12 on the lower surface side and the claw portion 16c of the locking block 16a is supported on the upper surface side ( (Fig. 11). At this time, the outer peripheral edge of the CD is pushed by the cam surface 30a of the cam guide 30 and is rigidly and elastically locked inward in the radial direction. As a result, the CD is inserted into the central hole 10a of the disk adapter 10.
Are arranged concentrically.

When removing the CD from the disk adapter 10, the relative rotational position of the second ring plate 14 with respect to the first ring plate 12 may be returned to the release position, that is, the original state (FIGS. 1 and 8). By doing this, each locking claw is released from the outer peripheral edge of the CD, and the disk adapter 1
You can remove the CD from scratch. According to the above-mentioned disk adapter, the C arranged in the central hole 10a
The outer peripheral edge of D is sandwiched from both sides, and further, it is rigidly and elastically held inward in the radial direction. Therefore, even if the disk adapter 10 receives a vibration from the outside, the vibration does not cause the disk adapter 10 to drop from the CD, and the CD and the disk adapter 10
And are kept very stable. Therefore, C
It is possible to prevent the disc adapter from falling off in the D playback device,
Failure of the playback device can be prevented.

Further, when the CD is mounted in the central hole 10a of the disk adapter 10, the claw portion 16c of the locking block 16a is released to the outside in the radial direction from the receiving shelf portion 18 as shown in FIG. . Therefore, the CD receiving shelf 1
Since the claw portion 16c does not interfere with the outer peripheral edge of the CD when it is placed on the disk 8, the CD can be easily attached to and detached from the disk adapter 10, and the C
Damage to D can also be prevented.

Further, since the elongated hole 32 is formed on the outer peripheral side of the cam guide 30 that pushes the locking block 16a inward, even if the outer diameter of the CD is slightly larger than the standard, the cam is slightly larger. By bending the portion of the guide 30 toward the outer peripheral side, the amount of overstroke can be effectively absorbed and the CD can be reliably held. Also, once C
If D is held, the movement of the locking block 16a is blocked by the cam guide 30, so that there is an effect that there is no risk of the CD falling off due to unintentional external vibration.

The present invention is not limited to the above-described embodiment, but various modifications can be made. For example,
The locking claw 16 is formed on the second ring plate 14 side, and
The cam guide 30 may be formed on the ring plate 12 side.

[0031]

As described above, in the disk adapter of the present invention, the small-diameter disk arranged in the central hole of the disk adapter has the outer peripheral edge thereof elastically deformed radially inward by the cam guide. Since it is sandwiched between the locking piece and the receiving shelf, the small-diameter disc can be securely held. Therefore, it is possible to prevent the disc adapter from falling out of the playback device, and thus prevent the playback device from being damaged. Further, when the second ring plate is at a position deviated from the predetermined rotation position with respect to the first ring plate, since the respective locking claws are not elastically deformed, the respective locking claws are positioned radially outward. Therefore, when the small diameter disc is attached to the center hole of the disc adapter, or when the small diameter disc is removed from the center hole of the disc adapter, the small diameter disc and the respective locking claws do not interfere with each other. Therefore, the small-diameter disc can be easily attached and detached, and the disc can be prevented from being damaged at this time.

[Brief description of drawings]

FIG. 1 is a plan view of a disk adapter.

FIG. 2 is an exploded view of a desk adapter.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a view in the direction V in FIG.

FIG. 6 is a schematic perspective view showing a disk adapter before placing a CD.

FIG. 7 is a schematic perspective view showing a disk adapter in which a CD is arranged.

FIG. 8 is an enlarged view of a part of the disk adapter.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is an enlarged view of a part of the disk adapter.

11 is a cross-sectional view taken along the line XI-XI in FIG.

[Explanation of symbols]

 10 Disc Adapter 10a Central Hole 12 First Ring Plate 14 Second Ring Plate 16 Locking Claw 18 Receiving Shelf 30 Cam Guide 30a Cam Surface CD Compact Disc

Claims (2)

[Claims] 1. A disc adapter for arranging a small-diameter disc in a central portion to enable reproduction of a small-diameter disc by a large-diameter disc reproducing device, the first ring having the same outer diameter dimension as the large-diameter disc. A ring disc (10) formed by superimposing a plate and a second ring plate so as to be rotatable relative to each other, and a ring disc (10) integrally projecting from an inner peripheral edge of the ring disc over a predetermined range in the circumferential direction, and in a central hole of the ring disc. When the small-diameter disc is arranged, a receiving shelf portion (18) that supports the outer peripheral edge of the small-diameter disc and one of the first and second ring plates are integrally formed, and are separated from each other in the circumferential direction of the ring disc, A plurality of locking claws (1 that can be elastically deformed radially inward toward the central hole)
6) and a plurality of members that are integrally formed on the other ring plate and that push out the corresponding locking claws radially inward when the second ring plate is rotated with respect to the first ring plate to a predetermined rotation position. A small-diameter disc provided in the central hole is provided with a cam guide (30), and the outer peripheral edge of the locking claw elastically deformed inward in the radial direction by the cam guide and the receiving shelf portion. A disk adapter that is sandwiched between. 2. The disk adapter according to claim 1, wherein three or more locking claws are provided.