WO1999010883A1

WO1999010883A1 - Recording medium and method of manufacturing recording media

Info

Publication number: WO1999010883A1
Application number: PCT/JP1997/003829
Authority: WO
Inventors: Tetsuya Oguchi
Original assignee: Tetsuya Oguchi
Priority date: 1997-08-22
Filing date: 1997-10-23
Publication date: 1999-03-04
Also published as: AU4722897A

Abstract

A recording medium adapted to improve the quality of sound or image recorded on optical recording media including CD, DVD, LD and CD-ROM which are used to record various kinds of data and programs, such as music, pictures and numerical formulae. As shown in the figure, this recording medium is provided with doubly arranged first and second holes (4, 5) in an inner silent region (2) constituting an inner non-recording region around a central hole (1), and third holes (7) in an outer silent region (3) constituting an outer non-recording region.

Description

Recording medium and method of manufacturing recording medium

1. Technical Field

The present invention relates to a recording medium and a method of manufacturing the recording medium, and more specifically, a CD, DVD, LD, and CD for recording various data programs such as music, video, and mathematical formulas.

The present invention relates to an optical recording medium such as a ROM and a method for manufacturing the recording medium.

2. Background Art In general, optical recording media such as CDs, DVDs, LDs, and CD-ROMs for recording various data and programs such as music, video, and mathematical formulas are donuts having a central hole. And has a recording area between a non-recording area inside around the center hole and a non-recording area outside around the edge.

Up to now, means for improving the quality of data reading or writing and improving quality on the side of the recording medium reading or writing device, for example, means for providing a stabilizer like some high-grade CD players Existed.

However, the effect is not absolute and also contributes to the high cost. In many cases, such as in a portable type reading / reproducing device, there is no structural difficulty.

Therefore, without providing means for improving the quality of the data reading or writing device, it is necessary to improve the accuracy of reading or writing the data in the recording medium, etc. Means were desired.

3. Disclosure of the invention

The present inventor has conducted intensive studies to solve the above-mentioned problems, and as a result, reducing the consumption of the servo current leads to the improvement of the quality. To reduce the servo current, it is most effective to reduce the vibration of the motor. Was found. In addition, the present inventor further contributes to quality improvement by increasing the center hole of the recording medium by about 0.1 to 0.8 mm, preferably about 0.2 to 0.5 mm from the standard. I also found out.

By forming an opening or recess in the non-recording area inside the recording medium that the clamp contacts, the contact area is reduced, and the vibration transmitted through the clamp is reduced. For example, it has been found that it is possible to remove, for example, distortion of sound that occurs at the time of reading or writing without applying any special means to the data reading or writing device.

In addition, by providing holes or recesses in the non-recording area outside the recording medium, it is possible to further increase the apparent mass increase due to the centrifugal force generated by the rotation of the recording medium, and thereby to expect a further synergistic effect. In addition, the present inventors have found that deformation due to expansion or the like can be prevented even in devices such as car audio and computers that are greatly affected by heat, and have completed the present invention.

That is, means for solving the problems of the present invention are as follows.

First, a recording medium that has an opening other than the center hole.

Second, a recording medium in which an opening is formed in a non-recording area inside the center hole. Third, the recording medium according to the second, wherein the positions are shifted to form double or more openings.

Fourth, a recording medium in which an opening is formed in an inner non-recording area around a center hole and an opening is also formed in an outer non-recording area.

Fifth, a recording medium with concave portions formed.

Sixth, a recording medium in which an opening is formed and the center hole is formed to be 0.1 to 0.8 mm larger than the standard.

Seventh, a recording medium obtained by using any one of the first to sixth recording media as a master and copying the master.

Eighthly, a method for producing a recording medium, which is produced by forming an opening in a recording medium having a central hole.

Ninth, a method for manufacturing a recording medium, which is manufactured by forming a concave portion in a recording medium having a central hole. A tenth aspect is a method for manufacturing a recording medium, wherein a recording medium obtained by forming an opening or a recess in a recording medium having a center hole is used as a master, and the master is copied to manufacture the recording medium.

Here, the opening is not limited to a circular shape, but includes any shape such as an elliptical shape and a bow shape, and the number thereof may be one or more.

Here, the recess may be a recess formed on the general surface, and includes a continuous or discontinuous groove.

The recording medium that is the object of the present invention is not limited to music CDs and MDs, but includes video CDs, DVDs, LDs, CD-Rs that store or intend to store various data programs such as audio, video, and mathematical formulas. Any object related to an optical recording medium such as CD_R〇M is applicable.

At the same time, analog records such as LPs and SPs, analog recording / reproducing devices such as record players, and turntable stabilizers such as reading / writing optical recording media such as CDs and LDs. The same effect can also be expected for any mechanical components interposed between the recording medium and the motor. When the opening or the concave portion is circular, the diameter thereof is 0.5 mm or more for a medium having a diameter of 12 cm, preferably 1.0 to 4.0.

Here, in addition to forming the opening or the concave portion when creating the recording medium, the opening or the concave portion is newly formed for each recording medium on which various data programs such as music are already recorded. You can also.

As a recording medium having an aperture / recess, a single or double or more aperture / recess is formed concentrically in a non-recording area inside or outside the center hole. When the recess is formed in two or more layers, it may be formed by shifting the position with respect to the radiation from the center hole to the outer edge.

When forming two or more holes / recesses, it is preferable that one or more holes / recesses formed in the non-recording area inside the recording medium exist on the radiation from the center to the outer edge. .

In addition, by forming a continuous or intermittent OS portion such as a groove on the recording medium, the sound quality and image quality can be improved by improving the data reading or writing accuracy of the recording medium. It can be of high quality. ^Four

Furthermore, by coloring the processing portion of the opening or the concave portion on the recording medium side green, or coloring the entire processing surface including the processing portion green, similarly, the reading or writing accuracy of data on the recording medium can be similarly improved. Improvements can improve the quality of sound and image quality.

ADVANTAGE OF THE INVENTION According to this invention, a sound quality, an image quality, etc. can be made high quality, without providing a means for quality improvement in the data reading or writing apparatus side.

4. Brief description of drawings

FIG. 1 is a perspective view of Embodiment 1 of a music recording medium according to the present invention, and FIG. 2 is a perspective view and a longitudinal sectional view of a main part of the music recording medium shown in FIG. A shows a perspective view of the main part, and FIG. 2B shows a longitudinal sectional view of the main part.

3 is a perspective view and a longitudinal sectional view of a main part of a second embodiment of a music recording medium according to the present invention. Specifically, FIG. 3A is a perspective view of the main part, and FIG. The longitudinal section of the main part is shown.

FIG. 4 is a perspective view and a longitudinal sectional view of a main part of a third embodiment of the music recording medium according to the present invention. Specifically, FIG. 4A is a perspective view of the main part, and FIG. The longitudinal section of the main part is shown.

5 BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1)

The recording medium of the first embodiment is a music CD having a diameter of 12 cm, and has a center hole 1 having a diameter of 15.4 mm, which is 0.4 mm larger than 15 which is a standard of CD.

Around the central hole 1, an inner silence area 2 having a width of 20 mm is formed as an inner non-recording area.

On the other hand, on the edge of the recording medium, an outer silence area 3 having a width of 8 mm from the edge is formed as an outer silence area.

In the inner silence area 2, 18 first holes 4 with a diameter of 2.5 mm are formed concentrically at 9 thighs at equal intervals, and 18 second 3.5 holes with a diameter of 3.5 are formed. Opening 5 has a diameter of 13 mra And are formed at regular intervals at positions shifted from the position of the first opening 4. That is, in the inner silent region 2, the second openings 5 are formed so as to be located between the adjacent first openings 4 with the opening positions shifted, and the openings are formed in a double manner. A heavily formed aperture will always be present on the radiation going from the center to the outer edge.

Outside the inner silence area 2, a recording area 6, which is a recording area for recording music, is formed.

Outside the dotted line indicating the outer edge of the recording area 6, the outer silence area 3 is formed.

In the outer silence region 3, 72 third holes 7 having a diameter of 3.5 mm are formed concentrically with a diameter of 54 mm at regular intervals.

Each hole to be formed in the above-mentioned recording medium is newly formed not only when creating a recording medium but also for a recording medium in which music, video, various data, programs, etc. are already recorded. You can also.

The diameter of the opening formed in the outer non-recording area may be smaller than the diameter of 3.5 holes corresponding to the width of the non-recording area.

(Example 2)

The recording medium of Example 2 was the same as the recording medium of Example 1 except that the recording medium of Example 2 corresponded to each opening of the recording medium of Example 1 and formed a concave portion having a spherical bottom, and had a diameter of 12 cm. It has a center hole 1 with a diameter of 15.4 mra, which is 0.4 mm larger than the standard 15 for CDs.

Around the center hole 1, an inner silence area 2 having a width of 20 mm is formed as an inner non-recording area. A concave portion is formed, and a spherical-bottom second concave portion is formed at a position where the second opening 5 is formed. On the other hand, at the edge of the recording medium, an outer silent region 3 having a width of 8 thighs from the edge is formed as an outer silent region.

As shown in FIGS. 3A and 3B, the third concave portion 27 having a spherical bottom portion of Example 2 formed in the outer silent region 3 has a spherical bottom portion having a diameter of 3.5 mm and a center depth of 0.6 mm. It is formed in a concentric shape with a diameter of 54 mm at regular intervals, like the third opening 7 of the first embodiment. Each recess formed in the recording medium described above can be formed not only when a recording medium is created, but also newly formed on a recording medium on which music, video data, programs, etc. are already recorded. it can.

(Example 3)

The recording medium of Example 3 was the same as the recording medium of Example 1 except that it corresponded to each opening of the recording medium of Example 1 and formed a short cylindrical concave portion, and had a diameter of 12 cm. It has a center hole 1 with a diameter of 15.4 mm, which is 0.4 mm larger than the standard for CDs, 15 mm.

Around the center hole 1, an inner silence area 2 having a width of 20 cm is formed as an inner non-recording area. Although not shown, a short columnar first area 4 is formed at the location where the first aperture 4 is formed. A concave portion is formed, and a short cylindrical second concave portion is formed at a position where the second opening 5 is formed. On the other hand, an outer silence area 3 having a width of 8 mm from the edge is formed as an outer silence area on the edge of the recording medium.

As shown in FIG. 4A and FIG. 4B, the short cylindrical third concave portion 37 of the third embodiment formed in the outer silent region 3 has a short cylindrical shape having a diameter of 3.5 mm and a depth of 0.6 mm. As in the case of the third opening 7 of the first embodiment, the holes are formed in a concentric shape having a diameter of 54 mm at regular intervals. Each recess formed in the above recording medium should be newly formed not only when creating the recording medium but also as a recording medium in which music, video, various data, programs, etc. are already recorded. Can also.

(Example 4)

The recording medium of Example 4 was manufactured by using the recording medium on which the music obtained in Example 1 was recorded as a master and copying the recording medium to a new CD-ROM based on the master.

(Test Example 1)

The music CD according to the present invention described in Example 1 above and the same music as the present invention except that the opening is not formed and the center hole is 15 mm as specified. The sound quality was tested by listening to a CD with a comparative product under the same conditions by eight testers.

The music recorded on the CD for music used in this test was of a pop style with female vocals.

In the test, the same track of the comparative product, the second comparative product, and the third comparative product were viewed and listened to in the same manner under the same conditions of the playback device, volume, etc. I asked them to judge the impressions of the second and third songs with “〇” and “X” and write their impressions.

At this time, each tester was informed in advance that only one out of three times was either the conventional product or the product of the present invention, but it was completely unclear which time it was. I didn't know.

As a result of the test, six subjects were given the first time as "X", the second time as "〇", the third time as "X", and one person with the first time as "〇", the second time as "X", and the third time as "X".残り ”, and the remaining one had“ X ”for the first,“ 〇 ”for the second, and“ 〇 ”for the third.

In the second impression, four people wrote that "the sound was clearly heard." Other than that, "the contrast increased," "the sound resonated," and "the sound quality was overheard." "Easy" "I can hear the lyrics more clearly". From the results of the above tests, it was confirmed that the quality of the product of the present invention was improved without providing any means for improving the quality on the reproducing apparatus side.

(Test Example 2)

A music CD according to the present invention described in Example 2 above, and a comparative music product similar to the present invention except that no recess is formed and the center hole is a 15 ridge as specified. The sound quality was tested by having six testers watch the CDs under the same conditions.

In the test, the first track, the second track of the present invention, and the third track of the same track of the same track were viewed and listened to in the same manner with the playback device and the volume, etc. I asked them to judge the impressions of the first, second, and third songs with “〇” and “X” and write their impressions.

As a result of the test, four people set the first time as "X", the second time as "〇", the third time as "X", and one person as the first time as "X", the second time as "〇", the third time as " 〇 ”.

In addition, one person described the first time as “〇”, the second time as “X”, and the third time as “〇”. As for the impressions that they watched, three people wrote that the sound was "spreading" for the second time, and other impressions such as "the sound became gentle to the ears" and "there was no fatigue" . From the results of the above tests, it was confirmed that the quality of the product of the present invention was improved without providing any means for improving the quality on the reproducing apparatus side.

(Test Example 3)

The opening used in manufacturing the music CD (product of the present invention) obtained in Example 4 above and the recording medium of Example 1 which is a master of the recording medium obtained in Example 4 was used. The sound quality was tested by having seven testers view the same music CD (comparison product) that they did not have under the same conditions.

In the test, the first track, the second track of the present invention, and the third track of the same track of the same track were viewed in the same manner with the playback device and the volume, etc. We asked them to judge the impressions of the second and third songs with “〇” and “X” and write their impressions.

As a result of the test, 4 people set the first time as “X”, the second time as “〇”, the third time as “X”, and the second person as the first time as “X”, the second time as “〇” and the third time as “ 〇 ”. In addition, one person marked "〇" for the first time, "X" for the second time, and "〇" for the third time. In the second impression, four people wrote, "I can hear fine sound well." Other impressions such as "The sound became less irritating" and "I do not get tired" It was written.

From the results of the above tests, it was confirmed that the quality of the product of the present invention was improved without providing any means for improving the quality on the reproducing apparatus side.

Claims

The scope of the claims

1. A recording medium that has an opening other than the center hole.

2. A recording medium that has an opening in the non-recording area inside the center hole.

3. The recording medium according to claim 2, wherein the positions are shifted to form double or more openings.

4. A recording medium that has an opening in the inner non-recording area around the center hole and an opening in the outer non-recording area.

5. A recording medium with a recess.

6. A recording medium that has an opening and a center hole that is 0.1 to 0.8 mm larger than the standard.

7. A recording medium obtained by using the recording medium according to any one of claims 1 to 6 as a master and copying the master.

8. A method of manufacturing a recording medium, which is manufactured by forming an opening in a recording medium having a center hole.

9. A method for producing a recording medium, wherein the concave section is formed in a recording medium having a central hole.

10. A method for manufacturing a recording medium, wherein a recording medium obtained by forming an opening or a concave portion in a recording medium having a center hole is used as a master, and the master is copied and manufactured.