JPH05303862A - Adaptor and compatible disk player for cd/md using the same - Google Patents

Abstract

PURPOSE:To provide a player by which both CD and MD can be used. CONSTITUTION:An adaptor 4 is a plate-shaped plate whose central part is protruded, and the convex surface has the shape of the turn table of the CD, and the concave surface has the shape almost adhered to or in contact with the turn table of the MD. Moreover, the thickness of the adaptor is constituted so that a distance between the information face of the MD and a pickup at the time of arranging the MD at the turn table of the MD can be almost the same as the distance between the information face of the CD and the pickup at the time of mounting the adaptor on the turn table of the MD, and mounting a CD 9 on the convex surface. Then, at the time of mounting the MD, the turn table for the MD is used as it is, and at the time of mounting the CD 9, the adaptor 4 is mounted on the turn table, and then the CD 9 is mounted on the pertinent adaptor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD / MD dual-use disc player capable of using both CD and MD.

[0002]

2. Description of the Related Art Conventionally, a compact disc (hereinafter referred to as C
(Abbreviated as “D”) has become popular and various CD players have been developed. FIG. 5 is an external view of a CD. FIG. 5 (A) shows
The top view and FIG. 5B are cross-sectional views. The outer diameter of the CD is
There are 12 cm and 8 cm, and the thickness is 1.2.
mm, the central opening has a diameter of 15 mm.

Recently, a mini disk (hereinafter abbreviated as MD) has newly appeared as an audio medium (JAS).
Journal, 1991, August issue, pages 37-42).

FIG. 6 is an external view of the MD, and FIG. 7 is an enlarged cross-sectional view of the MD. In the figure, 10 is a disk, 11 is a clamping plate, 12 is a cartridge, 15 is a shutter, 16 is an opening, and a is a step size. As shown in the figure, the outer shape of the MD cartridge 12 is almost a thin plate, and has a width of about 72 mm, a length of about 68 mm, and a thickness of about 5 mm. An optical disk or a magneto-optical disk on which information is actually recorded is stored in this cartridge. The outer diameter of the disk 10 stored is 64.
mm or 64.8 mm, central opening 16 is 11 mm
Then, a step-like step is provided on the disk 10 near the opening 16, and the dimension a of the step is about 0.8 mm. Clamping plate 11 is placed on the bottom of this step.
Is stuck.

For writing and reading information, the shutter 15 is slid to expose the read / write opening provided in the cartridge 12, and the disc 10 housed in the cartridge 12 is irradiated with light to reflect light. Information is read by receiving light, and information is written using magnetism.

For 12 cm and 8 cm CDs, equipment has been developed which allows both of them to be played by one player. It is considered that with the spread of MD, there is an increasing demand for a so-called compatible device that can use both CD and MD. The compatibility machine is more advantageous to the user in terms of space and cost than a case where a CD player and an MD player are separately provided.

The MD is designed to record information in the same way as the CD, and the drive system of the pickup and the motor can use the same mechanism as the conventional CD player. However, since the MD and the CD have different shapes as described above, they cannot be used together as they are.
One of the reasons is that the disk clamping method and the size of the turntable for driving the disk are different.

The method of clamping the CD and MD and the difference in the size of the turntable will be described in detail. Figure 3
FIG. 6 is a schematic view showing an example of conventional clamping of a CD player. In the figure, 1 is a motor, 5 is a clamper yoke, 6 is a clamper magnet, 9 is a disk, 14
Is a turntable for CD.

FIG. 3 is a schematic view showing an example of conventional clamping in a CD player, showing a method using a magnet. The disk 9 is placed on the CD turntable 14. On the CD turntable 14, there is provided a convex portion substantially equal in diameter to the central opening of the disc 9, and the convex portion fits into the central opening of the disc 9,
The disk 9 will be placed without displacement. Further, a clamper including a clamper yoke 5 and a clamper magnet 6 is provided on the upper portion of the disc 9, and the disc 9 is provided by the clamper magnet 6 provided under the clamper yoke 5 and the CD turntable 14.
Sandwich. The CD turntable 14 is made of a magnetic material, and the magnetic force of the clamper magnet 6 fixes the disk 9 thereto.

In addition to the above-mentioned clamping method, a pressing member is used instead of the clamper magnet 6 and the clamper yoke 5, and a portion corresponding to the clamper yoke 5 is
A method of pressing and supporting at the rotation center to perform clamping has also been conventionally used.

FIG. 4 is a schematic view showing an example of conventional clamping of MD. In the figure, 1 is a motor, 2 is a turntable, 3 is a clamping magnet, 10 is a disk, 11 is a clamping plate, 12 is a cartridge, and 13 is a cartridge holder.

Also in the MD, the central opening of the disk 10 is fitted into a convex portion provided on the turntable 2 and having a diameter substantially equal to the diameter of the central opening of the disk 10.
0 will be placed without displacement. But MD
1, a clamping plate 11 made of a magnetic material is provided above the central opening of the disk 10, and is clamped by the magnetic force of the clamping magnet 3 embedded in the center of the convex portion of the turntable 2. The ping plate 11 is attracted and the disc 10 is fixed to the turntable 2. At this time, the disk 10
Must be held out of contact with the cartridge 12. Therefore, the cartridge 12 is mounted on the cartridge holding portion 13, and the height of the mounting surface of the cartridge holding portion 13 and the turntable 2
It is necessary to adjust the height of the so that it has a predetermined relationship.

As described above, in the MD, since the disk 10 is housed in the cartridge 12, it is not possible to use a clamping method of pressing the disc from above by a clamper like the CD, and conversely, in the CD. Since there is no clamping plate, it is not possible to use a clamping method of the type that attracts with a clamping magnet like MD.

The diameter of the central opening is, as described above,
The CD has a length of 15 mm, while the MD has a length of 11 mm, and the convex portions provided on the turntable 2 are different in size.

Further, in the case of a CD, the area placed on the turntable 2 is substantially the same as the surface on which information is recorded (hereinafter referred to as the information surface), whereas
In the MD, there is a step having a dimension a around the center opening. Therefore, when the discs are placed on the turntables having the same height, the heights of the information surfaces are different, and a structure for adjusting the focal length of the pickup to each information surface is required.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and provides a player capable of utilizing both CD and MD with the information surface at the same position. The purpose is.

[0017]

According to the present invention, in the invention described in claim 1, there is provided an adapter used for a disc player for both CD and MD, which is a plate-shaped plate having a convex central portion. , The convex surface has the shape of a CD turntable, and the concave surface has a shape that makes close contact or contact with the MD turntable, and the distance between the information surface and the pickup when the MD is placed on the MD turntable, and this adapter Is placed on the turntable of the MD, and the CD is placed on the convex surface, the information surface of the CD and the pickup have a thickness that is substantially the same.

According to the second aspect of the invention,
In a disc player for both CD and MD, M
A turntable for D is provided, and when the MD is loaded, the adapter is mounted as it is, and when the CD is loaded, the adapter according to claim 1 is placed on the turntable, and the CD is placed on the adapter.
It is characterized by mounting.

Further, in the invention of claim 3, in the CD / MD dual-use disc player of claim 2, a clamping magnet is embedded in the convex portion of the MD turntable, and When the described adapter is made of a magnetic material, it is attracted to the clamping magnet.

According to a fourth aspect of the present invention, in the CD / MD dual-use disc player according to the second or third aspect, when the CD is mounted, the CD is clamped and rotated to mount the MD. In this case, a clamper device including a clamper that holds the MD cartridge and a clamper arm that contacts the clamper when the MD is placed and fixes the clamper is characterized.

[0021]

According to the present invention, in the adapter according to claim 1, the shape is a plate shape having a convex central portion, the convex surface is a CD turntable shape, and the concave surface is an MD turntable. By forming the adapter to be in close contact with or in contact with the MD turntable, the MD turntable can be used as the CD turntable only by mounting the adapter on the MD turntable.

Further, the thickness of the adapter is set to the distance between the information surface and the pickup when the MD is placed on the MD turntable, and the adapter is placed on the MD turntable and the CD is placed on the convex surface. By setting the thickness such that the distance between the information surface of the CD and the pickup when placed is almost the same, it is possible to focus on the information surface of the CD and MD even if the pickup side does not have a focus adjusting mechanism.

In the invention described in claim 2, both the CD and the MD can be used by allowing the player to mount the adapter described in claim 1.

In the invention according to claim 3, the clamping magnet is embedded in the convex portion of the MD turntable, and the adapter according to claim 1 is made of a magnetic material, so that the adapter is attracted to the clamping magnet. , It is possible to prevent the rotation shift between the adapter and the turntable.

Furthermore, by using the clamper and the clamper arm according to the fourth aspect, it is possible to provide a clamping mechanism having both functions of fixing the CD and fixing the MD cartridge.

[0026]

FIG. 1 is a schematic view showing an embodiment of a clamping portion when a CD is placed on a CD / MD dual-use disc player according to the present invention. In the figure, parts similar to those in FIGS. 3 and 4 are designated by the same reference numerals, and description thereof will be omitted.
4 is an adapter and 7 is a clamper holder.

The disc 9 used in FIG. 1 is a CD.
However, the motor 1 and the turntable 2 are shown in FIG.
The same as the one for MD is used. Further, the positional relationship with a pickup (not shown) is similar to that of the MD. A clamping magnet 3 is provided on the convex portion of the turntable 2.

The adapter 4 is a plate-shaped member having a convex central portion, and has a concave surface which is in close contact with or in contact with the MD turntable 2. Therefore, the concave surface and the turntable 2 rotate together to function as an integrated turntable. If the contact area between the adapter 4 and the turntable 2 is as large as possible, the frictional force can be increased and slippage or the like can be avoided. Further, the convex surface has a turntable shape of the disk 9, and a convex portion is formed in accordance with at least the size of the central opening of the disk 9. Therefore, the disk 9 can be placed on this adapter without displacement. Also, the adapter 4
It is possible to increase the frictional force between the disk 9 and the adapter and between the adapter and the turntable by roughening the surface of the disk and the surface of the turntable 2 to some extent or providing a film having a large friction coefficient.

The thickness of the adapter 4 is approximately the same as the dimension a of the step near the center opening of the MD. for that reason,
The distance between the information surface and the pickup when the MD is placed on the MD turntable, and the information surface and the pickup of the disc 9 when this adapter is placed on the MD turntable and the disc 9 is placed on the convex surface. Distance from
It will be almost the same. With such a thickness, a large-scale drive mechanism such as a focus adjustment mechanism is not required on the pickup side.

The adapter 4 is made of a magnetic material in this embodiment. Therefore, the clamping magnet 3 on the convex portion of the turntable 2 attracts the turntable 2 and the adhesion between the turntable 2 and the adapter 4 can be increased.
Further, the disk 9 can be clamped in cooperation with the clamper magnet 6 on the clamper side. If the clamper is not a magnet type but a pressing type and a sufficient frictional force with the turntable 2 can be obtained, the material of the adapter 4 does not need to be a magnetic material.
It may be a non-magnetic material such as hard plastic or aluminum.

The clamper comprises a clamper yoke 5, a clamper magnet 6 and a clamper holder 7,
The clamper magnet 6 is sandwiched between the clamper yoke 5 and the clamper holder 7. The clamper holder 7 abuts on the disc 9. The clamper holder 7 is made of a non-magnetic material, for example, plastic, and the top of the central portion is joined to the clamper yoke 5 by an appropriate means to hold the clamper magnet 6 as described above and also to hold the clamper magnet 6. 6 is protected.

A clamper arm 8 is located between the outer periphery of the clamper yoke 5 and the outer periphery of the clamper holder 7. The clamper arm 8 is fixed to the main body, but may be fixed via an elastic member.
When the disk 9 is being clamped, the clamper arm 8 is located at an intermediate portion between the outer circumference of the clamper yoke 5 and the outer circumference of the clamper holder 7, and is not in contact with any of them. Therefore, with respect to the rotation of the disk 9, the clamper yoke 5 and the clamper magnet 6 can rotate while the disk 9 is clamped.

FIG. 2 is a schematic view showing an embodiment of the clamping part when the MD is placed. The same parts as those in FIGS. 1 and 4 are designated by the same reference numerals and the description thereof will be omitted.

The disc 10 in FIG. 2 is a disc housed in the cartridge 12 of the MD. The motor 1, the turntable 2 in which the clamping magnet 3 is embedded, and the cartridge holder 13 are the same as those in FIG. However, in the case of MD, the adapter 4 is placed on the clamper side and attracted by the magnetic force of the clamper magnet 6.

When the MD is placed on the turntable 2 as in the conventional case, the cartridge 12 is inserted into the cartridge holding portion 13.
On top of that, the disc 10 is placed on the turntable 2,
The disk 10 is clamped by the clamping magnet 3 on the turntable 2 and separated from the cartridge 12 so as to be rotatable. At this time, the information surface of the disk 10 is above the surface of the turntable 2 by the distance a, as described above. However, since the CD was raised by the distance a by the adapter 4 when the CD was placed,
With the adapter 4 removed from the turntable 2, MD
Is placed on the turntable 2, so that the information surface of the MD is focused without changing the focal length of the pickup.

The clamper used for clamping the CD is the cartridge 12 of the MD when the MD is mounted.
Placed on top. At this time, the upper surface of the clamper holder 7 contacts the lower surface of the clamper arm 8, and the MD cartridge 12 is pressed and fixed by the clamper.

When the MD is used, as the type of the disk 10 to be stored, a read-only disk similar to the conventional CD and a magneto-optical disk capable of writing are also used. When a magnetic force method is used for clamping the CD, the magnetic force of the clamper magnet 6 may disturb the magnetism for writing on the disc. However, when using MD, the adapter 4 which is a magnetic body
Is located under the clamper holder 7, the magnetic force of the clamper magnet 6 is magnetically shielded so as not to disturb the writing magnetism. When the clamping method by pressing is used and the MD is used, the adapter 4 does not have to be positioned on the clamper side.

The adapter 4 may be attached / detached by the user, or an adapter mechanism may be provided to automatically attach / detach. Although it may be possible for the user to attach and detach the portable player or the top loading type player, it is preferable to automatically attach and detach the front loading type player. Further, the present invention can be applied to a loading mechanism of a type in which a disc is lowered from the top of a turntable and a loading mechanism of a type in which a turntable is raised from below the disc.

[0039]

As described above, according to the present invention, it is possible to provide a player capable of utilizing both CD and MD by simply attaching and detaching the adapter.
Further, by making the adapter a magnetic body, it can be attracted by the clamping magnet at the tip of the MD turntable, and the rotational displacement between the turntable and the adapter can be prevented. In addition, the clamper and the clamper arm can provide a clamping mechanism having both functions of fixing the CD and fixing the cartridge of the MD.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a clamping part when a CD is placed in a CD / MD dual-use disc player of the present invention.

FIG. 2 is a schematic view showing an example of a clamping portion when an MD is placed in the CD / MD dual-use disc player of the present invention.

FIG. 3 is a schematic diagram showing an example of conventional clamping of a CD player.

FIG. 4 is a schematic diagram showing an example of conventional clamping of an MD.

FIG. 5 is an external view of a CD.

FIG. 6 is an external view of an MD.

FIG. 7 is an enlarged cross-sectional view of MD.

[Explanation of symbols]

 1 Motor 2 Turntable 3 Clamping Magnet 4 Adapter 5 Clamper Yoke 6 Clamper Magnet 7 Clamper Holder 8 Clamper Arm 9, 10 Disk 11 Clamping Plate 12 Cartridge 13 Cartridge Holder

Claims (4)

[Claims] 1. An adapter for use in a disc player for both CD and MD, wherein a plate-shaped plate having a convex central portion, the convex surface of which is a turntable shape of CD, and the concave surface of which is almost the same as that of an MD turntable. It has a shape that makes close contact or contact, and when the MD is placed on the MD turntable, the distance between the information surface and the pickup, and this adapter is placed on the MD turntable and the CD is placed on the convex surface. An adapter for a CD / MD dual-use disc player, which has a thickness such that the distance between the information surface of the CD and the pickup is almost the same. 2. A disc player for both CD and MD, which has a turntable for MD, and when the MD is loaded, the adapter as described in claim 1 is mounted on the turntable as it is. A CD / MD which is mounted and a CD is mounted on the adapter.
Dual-purpose disc player. 3. A clamping magnet is embedded in the convex portion of the MD turntable, and the adapter according to claim 1 is made of a magnetic material so as to be attracted to the clamping magnet. The CD / MD dual-use disc player according to claim 2. 4. A clamper that clamps and rotates the CD when the CD is mounted, holds a MD cartridge when the MD is mounted, and a clamper arm that contacts the clamper when the MD is mounted and fixes the clamper. The CD / MD dual-use disc player according to claim 2 or 3, further comprising a clamper device comprising