JPS58114341A - Production of original disk for information recording medium - Google Patents

Abstract

PURPOSE:To decrease the wear of a stylus body and at the same time to form an even depressed and projected shape, by forming a soft layer of an inorganic material on the upper surface of a hard supporter and then forming a groove corresponding to a tracking guide by means of the stylus body. CONSTITUTION:An inorganic molten solution of In, Pb, Cu, etc. is poured onto a revolving glass flat plate 1, or a soft inorganic film 7 is formed on the plate 1 by a vacuum deposition process. A screw 24 is rotated by a driving motor 25, and a spare hole 20 corresponding to a tracking guide is formed by a diamond cutter 21 while a control lever 22 is shifted toward the radius direction of an original disk 9. Thus an original disk 21 is produced for a substrate of an information recording medium. The inorganic film is soft and even to decrease the wear of a stylus 17, and furthermore a uniform depth is assured for a spiral depressed and projected shape.

Description

Detailed Description of the Invention Technical Field of the Invention The present invention relates to the production of information storage medium substrates in which information is read by irradiating an information formation layer consisting of a recording layer or a light reflection layer with focused Radical light, etc. Concerning how to create a master disc for.

Technical background of the invention and its problems Recently, optical disk memory currently has a recording density several tens to one hundred times that of magnetic memory, and is also capable of non-contact recording and reproduction as well as high-speed random access. It has many advantages such as excellent long-term storage, easy recording, the ability to record additional data, and low cost per pit, so it is widely used for recording and reproduction purposes. There is. For playback-only applications, there are home video discs, business-use video discs, and audio PCM discs.19, for playback-only applications, there are dokiement files, pidio files, and general-purpose computer files. Examples include memory.

On the other hand, in order to achieve higher writing quality as an information storage medium used in this kind of information processing apparatus, it is necessary to narrow the track pitch.

In order to control the optical head to reach a predetermined physical position during writing or reading, the mechanical accuracy of the actuator that controls the position of the optical head alone is insufficient, and the mechanical precision of the actuator that controls the position of the optical head is insufficient. From this point of view, the information storage media are not compatible. On the other hand, if a tracking guide is provided on the information storage medium in advance, the position of the optical head on the information storage medium can be detected and the correction can be fed back to the actuator.
Reliability against truck lag can be increased.

As an example of a tracking guide, there is a method of forming irregularities corresponding to the wavelength of Raded light on an information forming layer consisting of a light reflecting layer or a writable recording layer. This is a so-called groove grouping method, in which preliminary grooves are formed on the information storage medium in a snow-like pattern like a normal record board. Then, the center of the condensed nine led light is
If the beam deviates from the center of the reserve groove, which has a width smaller than the waist size of the beam, it is optically detected by the phenomenon of reflection of reflected light.

In addition, one of the methods for producing this kind of information storage medium having a preliminary groove serving as a tracking guide is to form a substrate having a preliminary groove serving as a tracking guide and a nine-surface uneven surface from a master disk for manufacturing an information storage medium substrate. There is a method of forming an information forming layer on the uneven surface of this substrate. In this method of manufacturing an information storage medium, unevenness is provided on the surface of the substrate of the information storage medium to record information and guide tracking, so it is necessary to create a master disk with unevenness to be transferred. Become.

Therefore, in the past, a glass plate with a flat surface was coated with 7 Otrenost, and a concave and convex shape was formed on the tip of the glass plate.

However, when a concavo-convex shape is formed by radar exposure, a clear rectangular concavo-convex shape is obtained, but when the edges of this rectangular concave-convex shape are crossed with a reading radar pick-up roller, the edges become sharply rounded. It has the drawback that nine turns of diffraction tend to occur clearly and the focus is easily disturbed.

Instead of rounding and Radical exposure, an envelope is used to mechanically form unevenness on the surface of the master, making the shape into a figure 7 or trapezoidal shape, thereby making the edges less sharp.)
(9) The round blade method has been devised because there is less disturbance in focus due to the alignment, and because of the reflection of light from the inclined sides. .

However, in this case, if the hardness of the surface of the master is high, the seal will wear out quickly, and if the organic material is applied to the surface of the master, it will be difficult to apply it evenly, and the viscosity of the organic material will cause the seal to pull! However, there was a problem in that it was easy to cause bulging (lifting of both sides).

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the wear of the sealing body and to form a uniform uneven shape. It is intended to provide a method.

Summary of the Invention The present invention involves forming a soft layer of inorganic material on the upper surface of a hard support,
This is a method for creating a master disc in which grooves corresponding to tracking guides are formed in this soft layer using a sealing member.

Embodiments of the Invention The following is an explanation of an embodiment of the invention based on the drawings.
In the figure, 1 is a flat glass plate with a flat surface that is a base plate for a master disc, and this flat glass plate 1 is connected to a base plate driving device 2 for a master disc.
It is designed to rotate at a rotation speed of 30° rpm or more. A master plate holding device is attached to the drive shaft 4 of the motor 3 of the master plate driving device 2 and the nine-linte Sol 5, and is screwed to the upper end screw portion of the drive shaft 4. It has nine configurations, including 6 and 6. and,
After placing the glass flat plate 1 on the turntable 5 so that the rotation center hole (not shown) formed in the center thereof fits into the drive shaft 4, a master plate holder is attached to the threaded part of the drive shaft 4. The fittings 6 are screwed together to fix the glass plate 1 so that it does not move.

Then, as shown in Fig. 1, an inorganic resin liquid 7' such as Injem, lead, copper, etc. is poured from the container 1 onto a flat glass IkJ that is rotated at a rotational speed of 30 Orpm or higher, and is then Spread on 1 sheet of Yoshigarasu Senban. As shown in FIG. 2, an inorganic material film 1 which is easily plastically deformed is formed as a very thin soft layer of about 500 to 700× on the glass flat plate 1.
will be formed.

Next, the inorganic material film 1 is formed by this inorganic material film forming step.
The 9f-) flat plate 1, that is, the base plate 9 for the master with the preliminary continuous forming layer is formed with the preliminary groove forming layer 1 as shown in FIG.
0 drive device 11. This drive device 11 has almost the same construction as the master plate drive device 2,
The rotation center hole of the base plate 90 for master with preliminary continuous forming layer is the motor 12
After placing it on the turntable 14 so as to fit on the drive shaft 13 of the master plate 9, the presser 1j is screwed onto the drive shaft IJ to fix the master plate 9 with the preliminary groove forming layer. The rotation of the motor 12 is controlled based on a drive signal 1- from a motor drive circuit (not shown), so that the base plate 9 for the pre-stretching and stratifying board 9 is rotated.

Further, in the vicinity of the drive device 11, a nine-point writing head 19 is arranged, which holds a diamond cutter 11 as a nine-sealed body with a sharp tip via a holder 18. This write head 1
An operating rod 22 is protruded from the upper surface of 9, and this operating rod 2
2, an I-id rod 23 and a screw 24 are inserted therethrough. A drive motor 1j is connected to the screw 24, and the operation of the drive motor 25 causes the screw 2
4 is turned over by 1. The writing head 19 can be moved in the radial direction of the master plate 9 with pre-groove layering through the operating rod 22 by rotating this screw by -74 degrees.

Then, the inorganic substance 1[7 formed on the rotating glass flat plate 1 is scratched in a syspine shape using a diamond cutter J7.

Then, as shown in FIG. 4, a preliminary groove 20 corresponding to the recording information or tracking guide of the information storage medium is formed to create a base @ 21 for manufacturing the information storage medium substrate.

At this time, since the inorganic material film 1 as the preliminary groove forming layer is hard and has a much lower hardness than the glass flat plate 1, only the inorganic material film 1 is scraped without creating a restoring force. , a well rounded pre-groove 20 is formed, and the wear of the tip of the diamond cutter 11 as a seal is extremely small.

Therefore, by using the nine master disk 21 formed in this way, the nine master plate created through this master disk 21, and furthermore the stun arm created from this mask plate,
It is possible to create a substrate for an information storage medium that can be used as a recording information or a tracking guide.

Note that the inorganic material 1[7 as the soft layer may be formed by vacuum deposition or sputter deposition. In this case, the thickness of the inorganic material film 1 can be easily made uniform, and the depth can be made uniform by creating a convex-concave shape similar to that of snow.

Effects of the Invention As explained above, the present invention forms a soft layer on the upper surface of the round support, and forms a tracking guide on this soft layer with a seal, so that wear of the seal can be reduced and It prolongs the lifespan of the body and is economical. First, since the soft layer is made of an inorganic material, it is easy to be plastically deformed, and the uneven shape can be made uniform, and it can be processed with high precision.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and #11 is an explanatory drawing showing the process of forming a soft layer on a flat glass plate, and #! 2
The figure is a sectional view showing the original disk, Figure 43 is a configuration diagram of the groove forming device, and Figure 4 is an explanatory diagram showing the state of groove formation. DESCRIPTION OF SYMBOLS 1... Support body, 7... Soft layer, 17... Encapsulation body, 2
0...Groove. Applicant's Representative Patent Attorney Takehiko Suzue 8111 I21I No. 459 Procedural Amendment 1939 IF3. Kata 5 Day Patent Office Technique 'I J! 81 Haruki-dono 1,
Indication of the case Patent application No. 56-214926 2, Name of the invention Method for producing a master disk for manufacturing information storage medium substrates 3, Person making the amendment Relationship to the case Patent 81 (30?) Tokyo Shibaura Electric Co., Ltd. 4 , Agent Address: 17th Mori Building, 1-chome, Toranomon, Sen-ku, Tokyo, Part No. 5 Address: 105 Telephone: O3 (50z) 3181 (main representative) $ll on the statement (i [none'] in the content)

Claims (1)

[Claims] d) forming a soft layer of inorganic material on the upper surface of a hard support;
A method for producing a master disk for manufacturing an information storage medium substrate, characterized in that a groove corresponding to a tracking guide is formed in the soft layer using a sealing member. (2) The soft layer is made of an inorganic material that is easily plastically deformed! 1. A method for producing an OX board for manufacturing an information storage medium base Ik as described in item 1. 0) The soft layer is made of an inorganic material containing at least one of indium, lead, and copper. Method. (4) By soft layer line vacuum evaporation or su/minina ivy evaporation)
Claim 1 provides a method for producing a master disk for manufacturing an information storage medium substrate according to claim 2, characterized in that the method comprises: forming and removing. (Excellent) Claim 11 or 9 is the method for producing a master disc for manufacturing an information storage medium according to claim 2, wherein the support is made of a glass plate.