JPH05334601A - Sound quality improving sheet for optical disk - Google Patents

Abstract

PURPOSE:To provide the sound quality improving sheet for an optical disk which can improve the quality of reproduced sounds without modifying the optical disk or the reproducing device therefor. CONSTITUTION:This sheet is provided with a sheet body 3 having a plane shape equal to or smaller than the outside diameter of the optical disk 11 and a hole 2 aligning to the central hole of the optical disk. At least one surfaces of this sheet body 3 are formed as color surfaces 5 having a prescribed hue.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound quality improving sheet for an optical disk which can detect a digital signal recorded on an optical disk in the best condition and can improve a reproduced sound.

[0002]

2. Description of the Related Art As audio software that replaces vinyl records,
Recently, optical discs such as compact discs (CDs) and laser discs (LDs) have been remarkably popularized, and the sound quality is clearer than that of records and magnetic tapes and reproduced with a clear sound, and can be stored in place. It has advantages such as excellent durability in use, and has succeeded in achieving record records.

[0003]

However, even in the optical disk having many advantages as described above, the reproduced sound is metallic and too sharp, and the sound quality is felt lightly. You are being asked.

In an optical disc, a jetter error due to irregular reflection of light when a signal on the disc surface is read by an optical pickup and a rotation error due to a change in linear velocity when the disc is rotated are derived, and these have a delicate influence on the sound quality. , It is thought that they obscure the sounds or impede the ability to separate sounds from each other.

An object of the present invention is to provide a sound quality improving sheet for an optical disk, which can greatly improve the sound quality of a reproduced sound only by setting the optical disk and the reproducing apparatus together with the optical disk in the reproducing apparatus without any modification. It was made.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the above-mentioned prior art, and the present invention has a planar shape equal to or smaller than the outer diameter of the optical disc and conforms to the center hole of the optical disc. It is characterized in that a sheet main body having a hole is formed, and at least one surface of the sheet main body is a color surface having a predetermined hue.

[0007]

[Function] When the optical disc is reproduced, the sound quality improving sheet is placed on the tray of the reproducing device with the recording surface facing down, and the sound quality improving sheet is placed on the optical disc, and when the tray is in a reproducible state, the sound quality is improved between the optical disc and the rotation axis. The seat is supported coaxially. During reproduction, light from the optical pickup is diffusely reflected in the tray, and before being picked up by the optical pickup again, the diffused reflected light is absorbed by the color surface of the surface of the sound quality improvement sheet, and the diffused reflected light is extinguished to remove clouding of the sound. Also, because the sound quality improvement sheet is set on the optical disc,
The function as a stabilizer is exhibited, the rotation error is suppressed by the weighting action, and the sound quality is further improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

The sound quality improving sheet 1 according to the present invention is made of a synthetic resin such as vinyl chloride and has a thickness of about 0.5 to 1.5 mm, as shown in the plane view of FIG. 1 and the cross section of FIG. When a CD is used as a base of a sheet material, a sheet body 3 having a diameter of about 120 mm and a disk shape substantially the same size as the CD, and having a hole 2 at the center, which coincides with the center hole of the CD, is formed. This sheet main body 3 is formed of a colored material itself, or another colored film 4 is attached to one surface of the transparent sheet main body 3 as shown in FIG. Is defined as a color surface 5 having a specific hue.

When the hue used is green, which is the opposite color of the reddish light used in the optical pickup of the optical disk reproducing apparatus, particularly opaque deep green, the reproduced sound gives a sense of depth and the outline becomes clear. , The amount of reproduction information increases, and the sound is clear with good balance. Also, if it is blue (transparent), it will expand in the middle and high frequencies and suppress the low frequencies, and the sound balance will be closer to the high frequencies. Therefore, the sound quality improvement sheet 1 having the color surfaces 5 of various hues according to the preference of the timbre and sound quality.
By preparing, it is possible to obtain a reproduced sound that suits an individual's taste.

The sound quality improvement sheet 1 in the above embodiment is
The case where the entire surface is the color surface 5 of the same color is shown. The sheet main body 3 is transparent as shown in FIG. 4 and the cross section is shown in FIG. Three
Even if the ring-shaped color surfaces 5 and 5 of the hue are provided on the peripheral edge portion 3a of the CD and the peripheral edge portion 3b corresponding to the peripheral edge of the label surface of the CD, absorption is performed at a portion where diffused reflection light easily reaches. It does not obscure the label side.

The color surfaces 5 and 5 can be formed by attaching a film 6 having the color surfaces 5a and 5a to the transparent sheet body 3 as shown in the cross section in FIG.

Besides, as shown in FIG. 7, C is placed in the CD case.
A cutout line 8 having a diameter corresponding to the outer diameter of the CD and a cutout line 9 of a hole corresponding to the center hole of the CD on one surface 7a of the inner cover paper 7 inserted to enhance the texture of the transparent resin which is a constituent material of the case. And are made concentrically, and the cutout lines 8 and 9
A color surface 5 of a specific hue is formed by printing or the like on the entire surface of the entire space or a portion corresponding to each peripheral edge portion as in the case of FIG. It can be the improvement sheet 1. Further, an adhesive sheet may be attached to one surface of the sheet body 3 or an adhesive may be applied to be integrated with the optical disc for use.

Therefore, at the time of reproducing the optical disk, FIG.
As described above, the recording surface of the optical disk 11 is set on the tray 10 of the reproducing apparatus (CD player) with the recording surface of the optical disk 11 facing downward, and the sound quality improvement sheet 1 is placed on the tray 10 with the color surface 5 facing upward. When the tray is made reproducible in this way, the optical disk 11 and the sound quality improvement sheet 1 are coaxially supported between the rotating shafts 12 and 13 of the reproducing device.

When the reproducing device is operated, the signal recorded on the optical disk is detected by the laser light from the optical pickup of the reproducing device and reproduced as sound. At this time, a part of the laser light is recorded on the recording surface of the optical disk. Is diffusely reflected by a transparent plastic coating surface that protects the light, and the diffusely reflected light is absorbed by the color surface 5 of the sound quality improvement sheet 1 before reaching the optical pickup,
It is possible to prevent the diffusely reflected light from being picked up by the optical pickup again and to affect the sound quality. This improves the SN ratio and improves the sound quality.

Further, the sound quality improving sheet 1 is placed on the optical disc 11 and held between the rotating shafts, so that a weighting action is given to the optical disc 11, and the effect as a stabilizer is added to stabilize the optical disc during rotation. At the same time, sound quality deterioration due to rotation error is prevented.

[0017]

As described above, according to the present invention, since it is only necessary to put the optical disc on the optical disc when reproducing the optical disc, it is possible to improve the sound quality by using the existing reproducing apparatus, and it is easy and easy. The reproduced sound can be improved at low cost. In addition, by selecting the hue of the color surface of the sound quality improvement sheet, it is possible to reproduce with the sound quality that suits individual tastes, so it is possible to reproduce a lot of software recorded on the optical disk, which is very versatile. You can enjoy the sounds. Since they are set on the optical disc, they also have a stabilizer effect, so that the sound quality deterioration due to the rotation error can be prevented at the same time.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a sound quality improvement sheet according to the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view showing a modified example of FIG.

FIG. 4 is a plan view showing another embodiment of the present invention.

FIG. 5 is a sectional view of the same.

6 is a cross-sectional view showing a modified example of FIG.

FIG. 7 is a perspective view showing still another embodiment of the present invention.

FIG. 8 is a perspective view of the sound quality improvement sheet obtained from FIG. 7.

FIG. 9 is an explanatory diagram showing a state in which the sound quality improvement sheet according to the present invention is set on an optical disc in an overlapping manner.

[Explanation of symbols]

 1 Sound quality improvement sheet 2 Hole 3 Sheet body 4 Colored film 5 Color surface 6 Film 7 Inner cover paper 8, 9 Cutout line 10 Tray 11 Optical disk

Claims (1)

[Claims] 1. A sheet body having a planar shape which is equal to or smaller than the outer diameter of an optical disc and has a hole matching the center hole of the optical disc, at least one surface of the sheet body having a predetermined hue. A sound quality improvement sheet for optical disks, which is characterized by