JPS6255201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that the surface of the record is used as a reference surface in a portion other than the sound groove of a record, and the surface of the record is either convex or concave with respect to this reference surface, or a pattern of convex and concave, For example, the present invention relates to a method for producing a record disc having a so-called label-free label section that does not have anti-slip serrations or a paper label.

By the way, the following methods are known as conventional methods.

The method shown in FIG. 1 relates to a widely used method for manufacturing a record disc to which a paper label is attached.

In this method, first, sound grooves are cut into a lacquer master disc to form a lacquer master disc, and a conductive coating is coated on the surface of the lacquer master disc 1 on which the sound grooves 2 have been carved by silver plating or other methods. Apply 3. On this conductive film 3, electroforming of metal, for example, nickel, is performed as shown in FIG. 1A to form a first electroformed plate 4. The first electroformed plate 4 formed on the conductive coating 3 is peeled off from the lacquer master disc 1, and the lacquer master disc 1 is
Master board 5 is obtained, which is the opposite pattern. Next, a surface peeling film 7 is formed on the surface of the master disc 5 on which the protrusions 6 for forming sound grooves are formed, and a surface peeling film 7 is formed on the surface peeling film 7 (on the bottom side in FIG. 1B) in the case described above. Electroforming of nickel or the like is performed in the same manner as above to form a second electroformed plate 8 as shown in FIG. This second electroformed plate 8 is peeled off from the master disk 5 to obtain a mother disk 9 having a pattern opposite to that of the master disk 5. Furthermore, this mother board 9
A surface peeling film 11 is formed on the surface where the sound grooves 10 are formed in the same manner as in the above case, and electroforming of nickel or the like is performed on this surface peeling film 11.
A third electroformed plate 12 is formed as shown in FIG.
This third electroformed plate 12 is peeled off from the mother disk 9 to obtain a stamper 14 having projections 13 for forming sound grooves having a pattern opposite to that of the mother disk 9.
One more stamper 14 obtained by forming in this way is formed, and these stampers 14, 1
4 are respectively attached to a lower mold 15 and an upper mold 16 of a record press device as shown in FIG. 1D. Then, in the above-mentioned press device, a material such as vinyl chloride is pressed with paper labels 18, 18 attached, and a record disc 1 as shown in FIG.
Get 7.

In molding the record disc 17 obtained by such a manufacturing process and method, it is necessary to prepare a paper label 18 with predetermined information such as song titles printed on it in advance and attach it to a press machine. 17 Not only does the manufacturing process become complicated, but after press molding, the paper label 18 may peel off, reducing the product value. In addition, when defective records produced during the molding process are crushed and reused as raw materials, the paper label 18 cannot be peeled off and the label part that requires the most material must be discarded, making it difficult to recycle the material. The rate is extremely poor.

Therefore, so-called label-less record discs have been proposed in which characters and figures such as song titles are engraved directly on the label part without using the above-mentioned paper labels, etc., and various manufacturing methods have also been proposed. It extends to

An example of this is the method shown in FIG.

In this method, as shown in FIG. 2A, a concavo-convex pattern 19 for forming letters, figures, etc. is formed in advance on the part corresponding to the label part of the Lutzker master disc 1 on which the sound groove 2 is engraved. It is formed using a press mold 20. In this way, a master disc is formed in the same manner as in the above case based on the Lutzker master disc 1 on which the uneven pattern 19 for molding the label part is formed along with the sound groove 2, and then a mother disc is created from this master disc. Further, from this mother disk, a stamper 22 having a pattern opposite to that of the lacquer master disk 1 as shown in FIG. 2B is obtained. When this stamper 22 is attached to a mold of a predetermined record press machine and a record is formed, letters and figures are formed with unevenness on the label part, thereby obtaining a label-free record that does not require a paper label or the like. be able to.

According to this method, it is possible to obtain a label-free record, but since the uneven pattern must be formed on the most basic Lutzker master record using a stamping die, the sound grooves may be damaged during stamping. There is a great risk of giving. If the sound grooves are damaged, it cannot be used as a Lutzker master record at all. Due to these circumstances, it lacks practicality and cannot be used in a method for manufacturing record discs. Furthermore, in this method, there are restrictions on the depth and width of the unevenness in pattern formation, and it is not possible to apply ink to the protrusions of the label portion of the molded record to make characters or figures stand out.

Another method is to adhere the dry film resist 23 to the mother board 9 that has been sequentially formed by the method shown in FIG. and add a third build-up part 24 to the pattern part.
Form as shown. Mother board 9 like this
Based on this, there is a method of forming a stamper having a concave-convex pattern opposite to that of the mother disc 9, attaching the stamper to a record press machine, and press-molding a record without a label.

However, in this method, since the dry film resist is bonded to the entire surface of the mother disk 9, it is necessary to perform preliminary treatment to bond the resist to the sound groove portions as well. There is a risk that the sound grooves will be damaged during the period from this preliminary treatment to the subsequent post-treatment process. In addition, even after the dry film resist is removed after plating, the sound grooves are formed with extremely high density, so the removed residue of the resist remains attached or adsorbed to various parts of the sound groove. be. Therefore, there is a great risk that the sound quality of the record after press molding will be adversely affected. Therefore, it is impractical. Furthermore, there is also a drawback that a step is generated in the concave portion in the pattern of the label portion.

As yet another method, FIG. 4 shows a thin plate 25 on which unevenness for forming patterns such as letters and figures is formed on the part corresponding to the label part of the Lutzker master disc 1 obtained by the method shown in FIG. 1. There is a known method in which a master disc, a mother disc, and a stamper are formed as described above, and an unlabeled record disc is press-molded based on these stampers.

In this method as well, the first electroformed plate 4 is formed via the conductive coating 3 as described in FIG. 1, and this is peeled off to obtain the master plate 5. However, when peeling the first electroformed plate 4 from the lacquer master plate 1 to obtain the master plate 5, it is extremely difficult to separate it from the thin plate 25, making it difficult to mass-produce it quickly. Also, thin plate 2
5 is placed, a step corresponding to the thickness is created at the boundary portion, and the step also occurs on the record after press molding. Especially mother board 9, stamper 1
This also results in a negative effect on the lifespan of 4.

Furthermore, as another method, as shown in FIG. 5, a sound groove stamper 14a and a label stamper 14
b are formed separately, and each of these stampers 14
a, 14b as the lower mold 15 of the record press machine
There is also a method of combining the stampers 14 with the holder 26 when attaching them to the upper mold 16 to obtain one stamper 14, and then press-molding the record disc.

According to this method, since the sound groove stamper 14a and the label stamper 14b are manufactured completely independently, the sound groove stamper 14a is not damaged, and there is little possibility of causing problems in sound quality.
However, since manufacturing the stamper 14 requires separate steps, an increase in manufacturing costs is unavoidable. Furthermore, according to this method, a jig such as the above-mentioned holder 26 is required in order to assemble the sound groove and label stampers 14a, 14b when they are attached to a mold of a record press. For this reason, it is not possible to use conventional molds, and it is necessary to modify the record pressing device itself or change the pressing process, making it impossible to avoid a significant increase in costs.

Furthermore, as another method, a photosensitive resist 27 is applied to the surface of the mother board 9, and a necessary pattern is formed.
That is, after printing the letters and figures on the label part, they are developed and then etched. Finally, a mother disc 9 is formed having a pattern similar to that of the record disc obtained by press molding. A stamper 14 is formed from this mother disc 9 and attached to a predetermined mold of a record disc press to press-form a record disc.

However, in this method, as long as the patterns of letters, figures, etc. of the label section are obtained by etching the mother board 9, the patterns can only be formed as recesses. That is, on a record, characters and figures are expressed as grooves. In order to express these characters and figures as convex parts, after etching the mother board 9, a photosensitive resist is applied again, or the resist is adhered and baked and developed, and then plating is performed. You must give alms. In this method, the photosensitive resist must be applied up to the sound groove portion, and as explained with reference to FIG. 3, the effect on the sound groove 2 is large. It is obvious that etching and overlay plating on the same mother disk 9 is extremely dangerous for protecting the sound grooves 2.

Although it is not impossible to form a pattern on the master disk 5 or the stamper 14 by etching as described above, it is extremely difficult because of the projections 13 for forming sound grooves.

As mentioned above, the label section and serrations for preventing slips, which are obtained by forming convex or concave patterns, or both, on the surface of the record, can be made using conventional methods without adversely affecting the sound quality of the record. It is impossible to form a record without making major changes to the manufacturing method.

Therefore, the present invention aims to provide a new method for manufacturing a record disc that solves all the problems that could not be achieved by the conventional methods as described above. A step of placing a thin plate having a pattern on the inner circumferential side of the sound groove portion of a Lutzker master disk having a sound groove portion or a master disk or both, and placing an electroformed plate on the Lutzker master disk or master disk. A step of obtaining a record master including a step of fixing the electroformed plate and the thin plate to each other during the forming electroforming process, and forming a sound groove part and a pattern of at least concave or convex parts on the record surface based on the record master. The method is characterized in that it consists of a step of causing.

Hereinafter, specific embodiments of the present invention will be explained step by step.

First, we cut sound grooves into a Lutzker disk to form a Lutzker master disk, as is done conventionally.
A conductive film 33 is formed on the surface of the lacquer master disc 31, which is the surface on which the sound grooves 32 are carved, by silver plating or other methods. Then, characters, figures, etc., which are convex patterns that are at least smaller than the innermost concentric circle of the sound grooves 32 carved on this Lutzker master record 31 and are finally formed on the press-molded record, are formed. A thin plate 35 of about 0.4 mm thick made of metal such as nickel is formed by etching a pattern 34 having a diameter larger than that of the label portion to be etched and having a concave shape similar to the pattern corresponding to the above pattern. , and is placed on the inner periphery of the sound groove portion 32 of the lacquer master disc 31 so as to be pressed and supported by the presser plate 36 so as to be in close contact with it, as shown in FIG. 7A. The thin plate 35 is the pattern 3
4 is placed so as to face the conductive film 33, and the etching depth, which is the depth of the concave portion of the pattern 34, is approximately 0.2 mm. As long as the thickness is smaller than 35, it can be freely selected. Note that the pressing plate 36 is formed smaller than the thin plate 35.
After the thin plate 35 is placed closely on the lacquer master plate 31 in this manner, electroforming is performed using nickel plating or the like to form the first electroformed plate 37. This electroformed plate 3
7 is in a state of being integrally joined to the thin plate 35.

Next, the first electroformed plate 37 is peeled off from the lacquer master disc 31 to obtain a master disc 38.
This master disk 38 integrates a thin plate 35 with a pattern 34 etched on the inner peripheral side of the electroformed portion. Since the thin plate 35 is integrated in this manner, the holding plate 36 must be formed smaller than the thin plate 35 so that the connecting portion 35a to the electroformed portion faces the outside.

Note that pattern 3 of the thin plate 35 used here
4 is formed with a concave portion, the resulting master disc 38 has a reference surface 40 of the sound groove portion on which the projection 39 for forming the sound groove is formed protrudingly, as shown in FIG. 7B.
It is formed as a more concave part.

Then, a surface peeling film 41 is formed on the surface of the master disc 38 on which the protrusions 39 for forming sound grooves are formed, and on this surface peeling film 41 (the seventh
The lower surface side in FIG. 7C is electroformed using nickel plating or the like in the same manner as in the previous case to form a second electroformed plate 42 as shown in FIG. 7C.

Therefore, from this, the thin plate 35 has the property of being integrated with the electroforming material, such as nickel metal plate, and the most suitable metal plate is a metal plate such as nickel, which has the property of being extremely easy to separate from the surface peeling film 41. desirable. This second electroformed plate 42 is peeled off from the master disk 38 to obtain a mother disk 43 having a pattern opposite to that of the master disk 38. Furthermore, a surface peeling film 45 is formed on the surface of the mother disk 43 on which the sound grooves 44 are formed in the same manner as in the above case, and electroforming is performed on this surface peeling film 45 using nickel plating or the like, as shown in FIG. A third electroformed plate 46 is obtained as shown in d. This third electroformed plate 46 is peeled off from the mother board 43, and projections 47 for forming sound grooves, which have a pattern opposite to that of this mother board 43, are removed.
In addition, a stamper 50 as shown in FIG. 7E is obtained which has a concave groove 49 which is a pattern 48 of a label portion, such as letters or figures. This stamper 50 has a reference surface 51 which is a label surface which is the thickest part during press molding of a record disc.
It has a protrusion 47 for forming a sound groove that is convex with respect to the reference surface 51, and a pattern 48 for forming a label portion or the like that is concave with respect to the reference surface 51. Another stamper 50 obtained in this manner is formed in the same manner, and these stampers 50, 50 are placed in the lower mold 52 of the record press machine as shown in FIG.
and an upper mold 53, and press a material such as vinyl chloride to form a record disc 54. The record disc 54 obtained here has a sound groove portion 5 formed with a sound groove 55, as shown in FIG.
It is possible to obtain a labelless record disc in which a pattern 59 such as letters or figures formed as a convex portion 58 with respect to a reference surface 57 is formed on the inner peripheral side of the disc.

In addition, in the case where only a convex pattern such as a serration for preventing slipping is to be formed, a thin plate 35 having a concave pattern formed on the inner circumferential side of the mother board 43 is provided to The stamper 50 may also be obtained by casting.

In the above-mentioned method, the patterns such as letters and figures formed on the label part are formed in a convex shape with respect to the reference surface of the label part, but according to the method described below, they can be formed in a concave shape.

That is, a thin plate 35 similar to that described with reference to FIG. 7 is brought into close contact with a master disk 38 obtained by electroforming on the lacquer master disk 31. This thin plate 35 has a diameter that is smaller than the innermost circle of the sound groove portion and larger than the label portion on which concave patterns such as letters and figures are formed on the final press-molded record. , a pattern 34 similar to the above-mentioned concave pattern is formed to a depth of approximately
It is formed by etching to 0.2mm. Then, as shown in FIG.
6, and are pressed and supported in close contact. Here, the second electroformed plate 42 is formed by electroforming using nickel plating or the like. This electroformed plate 42 is in a state where it is integrally joined to the thin plate 35 similarly to the first electroformed plate 37 described above.

Next, the second electroformed plate 42 is placed on the master plate 3.
Peel off from 8. In this way, a mother board 43 is obtained in which a thin plate 35 with a pattern 34 etched on the inner peripheral side of an electroformed part 60 formed by electroforming is integrated as shown in FIG. 8B.

Furthermore, a surface peeling film 45 is formed on the surface of the mother disc 43 on which the sound grooves 44 are formed, and electroforming is performed on the surface peeling film 45 using nickel plating or the like, as shown in FIG. 8C. 3 electroformed plate 46 is obtained. This third electroformed plate 46 is peeled off from the mother disk 43, and has protrusions 47 forming sound grooves having a pattern opposite to that of the mother disk 43, and a pattern 48 of, for example, letters or figures on the label portion. A stamper 50 as shown in FIG. 8D having a convex portion 61 is obtained. This stamper 50 is
Sound groove molding and protrusion 4 are protruding from a reference surface 51, which is one side of the label portion, which is the thickest portion during press molding of a record disc, on which no unevenness is formed.
7, and a pattern 48 for forming a label portion, etc., which is similarly convex with respect to the reference surface 51.
Another stamper 50 obtained in this manner is formed in the same manner, and these stampers 50
0.50 is attached to a mold of a predetermined record press machine, and a material such as vinyl chloride is pressed to form a record. As shown in FIG. 8E, the record 54 obtained here has a pattern of characters, figures, etc. formed as a recess 62 on the inner circumferential side of the sound groove portion 56 in which the sound groove 55 is formed relative to the reference surface 57. You can get a so-called non-label record with 59.

Furthermore, the following method may be used to form patterns such as letters and figures on the label portion of a record disc in both convex and concave shapes with respect to the reference surface.

First, as in the method explained with reference to FIG.
Lutzker master board 3 with conductive coating 33 formed
A first thin plate 135 made of metal such as nickel and having a thickness of about 0.4 mm is placed on the inner circumferential side of the sound groove 32 of No. 1 so as to be pressed and supported by a holding plate 36 so as to be in close contact with it. do. This first thin plate 135 is etched with a concave pattern 134 for forming a convex serration to prevent slipping with respect to the reference plane formed between the sound groove section and the label section of the record. It is formed by twisting.
Electroforming is performed by placing the first thin plate 135 in close contact with each other in this way, and the first electroformed plate 37 is formed as shown in FIG.
form. This electroformed plate 37 is in a state of being integrally joined to the first thin plate 135, as in the case described with reference to FIG. Then, the first electroformed plate 37 is peeled off from the lacquer master plate 31, and a first thin plate 135 is integrated on the inner circumference side of the electroformed portion as shown in FIG. 9B. 3
Get 8. As shown in FIG. 7B, this master disk 38 is provided with protrusions 39 for forming sound grooves, and patterns 13 for forming serrations.
4 is formed in a concave shape with respect to the reference surface.

Next, a second thin plate 235 on which a pattern 234 for forming characters, figures, etc. to be formed on the label portion is etched is placed closely on the inner peripheral side of the pattern 134 for forming serrations on the master disc 38. This second thin plate 235 is formed to have a smaller diameter than the first thin plate 135, but the thickness is about the same, and it is used to form letters, figures, etc., which are concave patterns formed on the final press-molded record. A pattern 234 having a diameter larger than the label portion to be formed and similar to the concave pattern described above is formed to a depth of approximately
It is formed by etching to 0.2mm. Then, in the same way as shown in FIG. 8A, the surface release film 41 applied to the surface of the master disk 38 is pressed and supported by a presser plate 36 (on the lower side in FIG. 9C). It is closely attached. Here, electroforming using nickel plating or the like is performed as shown in FIG. 9C to form a second electroformed plate 42. This electroformed plate 42
is in a state of being integrally joined to the thin plate 235 similarly to the first electroformed plate 37 described above.

Next, the second electroformed plate 42 is placed on the master plate 3.
The mother board 4 is peeled off from the mother board 8 as shown in FIG.
Get 3. As shown in the figure, this mother board 43 has a convex pattern 136 for forming serrations and a concave pattern 234 of a second thin plate 235 for forming characters, figures, etc. to be formed on the label part, together with the sound grooves 44. At the same time, it has come to be held at the same time.

Furthermore, in the same way as in the previous case, a surface peeling film 45 is formed on the surface of the mother board 43 where the sound grooves are formed, and electroforming is performed on this surface peeling film 45, as shown in FIG. 9E. A third electroformed plate 46 is obtained. This third electroformed plate 46 is peeled off from the mother plate 43 to obtain a stamper 50 as shown in FIG. This stamper 50 has a protrusion 47 for forming sound grooves.
A pattern 147 that is concave with respect to the reference surface 51 for serration molding, and a pattern 248 for molding the label portion that is convex with respect to the reference surface 51 on the inner peripheral side thereof. If one more stamper 50 obtained in this way is made in the same manner, these stampers 50, 50 are attached to the mold of a predetermined record press machine, and a material such as vinyl chloride is press-molded, as shown in FIG. A record disc 54 as shown in (B) is obtained. That is, between the sound groove part 101 and the label part 102, there is a label part 102 which is the thickest part of the record 54.
The label part 102 has a reference surface 103 which is not engraved with a pattern such as letters or figures, and has a serration 104 that is a convex part protruding from the reference surface 103 to prevent slipping. A label-free record disc 54 having a pattern 105 of characters, figures, etc. made into a concave portion in contrast to the pattern 103 is obtained. By applying ink to the recessed pattern 105, letters, figures, etc. can be made to stand out.

In each of the above-mentioned embodiments, a pattern of concave or convex, or both, is formed on the inner periphery of the sound groove of the record, such as the label part of the record, with respect to the reference surface of the record. However, it can be formed in any part without a sound groove.

Furthermore, the thin plates used in each of the above embodiments are not limited to nickel plates; they are conductive or can be made to have conductivity, and can be plated for electroforming, and the electroformed parts Any material may be used as long as it cannot be separated from the peeling film and is separable from the peeling film. The pattern formed on this thin plate may be formed by etching, embossing, engraving, stamping, or the like. This is because it can be done separately from carving the sound grooves. Note that when a pattern is formed by embossing, the depth of the pattern is not limited by plastic deformation of the thin plate itself. Furthermore, when forming convex and concave patterns, at least one thin plate forming the concave pattern and the other thin plate forming the convex pattern overlap each other throughout the electroforming period of plating. The mounting order of one and the other thin plate may be reversed, provided that they are arranged and mounted so that they do not overlap.

In addition, in each of the above embodiments, a holding plate is used to make the thin plate adhere to the thin plate, but other methods may be used as long as the thin plate can be brought into close contact with a supporting substrate such as a Lutzkermaster board, and this holding plate is not necessarily required. It's not a thing.

As mentioned above, according to the method according to the invention:
A thin plate on which a predetermined pattern such as a necessary concave or convex pattern has been formed in advance is brought into close contact with a lacquer master disk or a master disk, and electroforming is performed, and the thin plate is integrated with the above-mentioned thin plate obtained from the lacquer master disk or master disk. Master discs or mother discs do not have any modifications to their sound grooves, so
The quality of the above-mentioned sound groove is not impaired at all. Therefore,
The quality of the stamper finally obtained therefrom, especially the quality of the projections for forming sound grooves, is fully guaranteed.

Further, according to the method of the present invention, a conventionally commonly used device can be used without making any modification to the record press device, and without the need for jigs or the like.

Of course, there will be no harmful steps or the like on the molded record. Then, it is possible to mold a label-free record disc having serrations to prevent slipping.

Furthermore, since the storage and management of once completed master discs, mother discs, stampers, etc. are not duplicated in the process, the process can be extremely smooth and it is advantageous to maintain manufacturing costs.

[Brief explanation of the drawing]

Figures 1A to 1E are cross-sectional views showing the manufacturing process of a conventional record disc with a paper label, and Figure 2 shows the manufacturing process of a conventional labelless record disc. 2 is a sectional view showing a pattern formed on a Lutzker master disc, FIG. 2 B is a sectional view showing a stamper obtained from the stamper, and FIG. FIG. 4 is a cross-sectional view of a mother disc with a pattern embedded therein, which is formed when the mother disc is manufactured, and FIG. is a cross-sectional view of a state where
FIG. 5 is a sectional view showing a state in which a stamper formed when manufacturing a label-less record according to still another conventional example is attached to a mold, and FIG. This is a cross-sectional view showing a state in which a pattern is formed by photoetching on a mother board that is formed when manufacturing a board. FIG. 7 is a cross-sectional view showing the process of obtaining a record disc by the method of the present invention; FIG. , 7th
Figure C shows the state in which electroforming has been applied to the master board, Figure 7 D shows the state in which electroforming has been performed to the mother board, Figure 7 E shows the stamper, and Figure 7 F shows the stamper in the mold. Fig. 7 shows a state in which the record disc is press-molded by attaching it to the record disc, and Fig. 7 (d) shows a sectional view of the record disc that is press-molded there. FIG. 8 is a sectional view showing another embodiment of the method of the present invention, and FIG.
Figure 8 (b) shows the mother disc, Figure 8 (c) shows the mother disc after electroforming, Figure 8 (d) shows the stamper, and Figure 8 (e) shows the record disc that is press-molded by this method. It shows a cross-sectional view. FIG. 9 is a sectional view showing still another embodiment of the method of the present invention. FIG. 9A shows the first thin plate in close contact with the Lutzker master disk, and FIG. 9B shows the master disk. 9C shows the state in which the second thin plate is brought into close contact with the master board, FIG. 9D shows the mother board, FIG. 9E shows the state in which the mother board has been electroformed, and Figure 9 shows the stamper. 1st
Figure 0 shows a record disc obtained by this method, and Figure 10A is a partial plan view thereof.
Figure 0B is its cross-sectional view. 31... Lutzker master disk, 33... Conductive film, 35... Thin plate, 38... Master disk, 41... Surface release film, 43... Mother board, 45... Surface release film, 5
0...Stamper, 54 record.

Claims (1)

[Claims] 1. A step of placing a thin plate having at least a concave or convex pattern on the inner peripheral side of the sound groove portion of the Lutzker master disk or master disk having a sound groove portion, or both, and on the Lutzker master disk or master disk. a step of obtaining a record master including a step of fixing the electroformed plate and the thin plate to each other during the electroforming step of forming an electroformed plate, and forming a sound groove portion and at least a concave or A method for producing a record disc, which comprises a step of forming a pattern using convexities.