JP2011192355A - Optical information medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information medium having high elaboration without impairing a fine sight. <P>SOLUTION: The optical disk 1 includes a base material, an information recording layer formed on the base material and a light transmission layer formed on the information recording layer and is constituted in such a way that recorded data can be read out from the information recording layer by irradiating the information recording layer with a laser beam from the light transmission layer side. In the optical disk 1, a recessed part is formed on the light transmission layer side of a code recording area Am superposed on the information recording layer formed area in the thickness direction of the optical information medium in a non-information area A1 on an inner peripheral side of the optical disk 1 and codes (A, B, and C, ...) are written in the non-information area on the inner peripheral side by the recessed part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical information medium on which various symbols are written.

  For example, Japanese Patent Application Laid-Open No. 2004-199771 discloses an optical information medium configured with a printing layer capable of printing an arbitrary symbol or design by various printing methods such as an inkjet method. In this optical information medium, a recording layer, a metal reflection layer, a protective layer, and a printing layer are formed in this order on one surface of a transparent substrate. This publication also discloses an optical information medium in which a printing foundation layer is formed between the protective layer and the printing layer. In these optical information media, it is possible to record the recording data on the recording layer and read the recording data from the recording layer by irradiating the recording layer with laser light from the other surface side of the transparent substrate. It is possible.

  In this case, in this optical information medium, the printing layer is formed from the area where the recording layer and the metal reflection layer are formed to the inner peripheral side. Further, in this optical information medium, light is refracted in a region where a recording layer is formed, that is, a region where a recording / reproducing annular groove (groove) is formed and a region where this annular groove is not formed. In order not to cause a sense of incongruity that the colors of symbols and designs printed on the printing layer are different due to the difference in rate, a dummy is placed on the inner circumference side of the area where the recording layer is formed. An annular groove is formed. This makes it possible to print symbols and designs in a wide area extending from the recording layer formation area to the inner peripheral side of the recording layer without causing a sense of incongruity in different colors.

Japanese Unexamined Patent Publication No. 2004-199771 (page 5-8, FIG. 2-3)

  However, the conventional optical information medium has the following problems. That is, a conventional optical information medium includes a print layer that can print an arbitrary symbol or design by various printing methods such as an ink jet method. In this case, an ink jet printer configured to be able to print symbols and the like on this type of optical information medium generally employs a configuration in which the symbols and the like are printed using water-soluble ink. Therefore, in an optical information medium in which symbols or the like are printed on a print layer by an inkjet printer, for example, when the print layer is touched with a sweaty hand, bleeding may occur in the symbols or the like printed on the print layer. For this reason, the conventional optical information medium has a problem in that the symbols printed on the printing layer are blurred and the aesthetic appearance thereof may be impaired.

  In addition, conventional optical information media in which symbols and designs are printed on the printed layer formed on the other side of the transparent substrate (so-called label surface) are commercially available videos in which various symbols and designs are printed on the label surface at the time of shipment from the factory. It looks almost the same as optical information media such as discs and music discs. Therefore, with conventional optical information media, it is difficult for the user to memorize novelty even if the symbols and designs to be printed on the printed layer are elaborated. There is also a problem that it is difficult to provide an information medium.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide an optical information medium having a sufficiently high taste without incurring a situation in which aesthetics are impaired.

  In order to achieve the above object, an optical information medium according to the present invention comprises a base material, an information recording layer formed on the base material, and a light transmission layer formed on the information recording layer. An optical information medium configured to be able to read recording data from the information recording layer by irradiation of a laser beam from the light transmission layer side toward the information recording layer, and an inner circumference of the optical information medium In the non-information area on the side, a recess is formed on the light transmission layer side of the area overlapping the formation area of the information recording layer in the thickness direction of the optical information medium, and the non-information on the inner peripheral side is formed by the recess Symbols are marked in the area. The above-mentioned “information recording layer” means “light reflecting layer”, “recording layer such as a phase change film or a dye film” and “recording” in a recordable optical information medium or a rewritable optical information medium. In addition to the “protective layer for protecting the layer” and the like, in the read-only optical information medium, it means “the pit (mark) formation site on the substrate” and “the light reflecting layer”.

  In the optical information medium according to the present invention, the concave portion is formed to a depth that reaches the base material.

  Furthermore, the optical information medium according to the present invention is colored in a region that overlaps in the thickness direction with respect to at least the region on which the symbol is marked on the surface of the substrate opposite to the surface on which the light transmission layer is formed. A back layer is formed.

  In the optical information medium according to the present invention, the concave portion is formed within the thickness range of the light transmission layer.

  According to the optical information medium of the present invention, the concave portion is formed on the light transmission layer side of the area overlapping the information recording layer forming area in the thickness direction of the optical information medium in the non-information area on the inner peripheral side of the optical information medium. Unlike the symbols printed on the print layer by an ink jet printer or the like, the symbols are written by the physically formed recesses by forming and marking the symbols in the non-information area on the inner periphery side by the recesses. ing. Therefore, for example, even if it is touched with a sweaty hand, bleeding does not occur, so that it is possible to reliably avoid a situation in which the aesthetic appearance is impaired. In addition, since an arbitrary symbol is marked on the side of the light transmission layer in the non-information area on the inner periphery side where no symbol is marked in a general optical information medium, the optical information medium is sufficiently highly interesting Can be provided. Further, since the symbols are marked in the non-information area on the inner circumference side, the optical information medium is used without causing a situation where the marked symbols (recesses) hinder access to the information area. be able to.

  Further, according to the optical information medium according to the present invention, since the symbol is described by the recess having a depth reaching the base material, when viewed from the side of the light transmission layer, the portion where the recess is formed (the portion indicated by the symbol). ), The light is not reflected by the light reflecting layer in the information recording layer, and since the information recording layer does not exist, the symbol is different in color from the forming material of each layer constituting the information recording layer. Therefore, the visibility can be sufficiently improved.

  Furthermore, according to the optical information medium according to the present invention, the colored back layer is provided in a region overlapping in the thickness direction with respect to the region marked at least on the surface of the substrate opposite to the surface on which the light transmission layer is formed. By forming, when viewed from the side of the light transmission layer, the colored back layer is visually recognized at the recessed portion forming portion (the portion where the symbol is marked), and therefore the visibility of the symbol can be further improved. Further, by setting the color of the back layer to an arbitrary color, it is possible to provide an optical information medium having a high preference with a symbol of an arbitrary color.

  Further, according to the optical information medium according to the present invention, since the symbol is marked by the concave portion formed within the thickness range of the light transmitting layer, the information recording layer does not come into contact with the outside air at the formation portion of the concave portion. Therefore, it is possible to avoid the deterioration of the information recording layer at the recessed portion formation site.

It is a top view of the optical disk 1 (1A-1D). 1 is a cross-sectional view of an optical disc 1. FIG. 4 is an explanatory diagram for explaining a positional relationship between an area or zone defined on the optical disc 1 (1A) and an information recording layer 12. FIG. It is a top view which shows an example of the symbol described on the optical disk 1 (1A-1D). 1 is a cross-sectional view of an optical disc 1A. It is explanatory drawing for demonstrating the positional relationship of the area and zone prescribed | regulated in the optical disks 1B-1D, and the information recording layers 12a and 12b. It is sectional drawing of the optical disk 1B. It is sectional drawing of the optical disk 1C. It is sectional drawing of the optical disk 1D.

  Embodiments of an optical information medium according to the present invention will be described below with reference to the accompanying drawings.

  An optical disc 1 in FIG. 1 is a single-sided single-layer rewritable disc that is an example of an optical information medium. As shown in FIG. 2, a base 11 and an information recording layer 12 formed on the base 11 The light transmission layer 13 formed on the information recording layer 12 and the printed layer 14 formed on the back surface side of the formation surface of the information recording layer 12 and the like in the substrate 11 are formed in a disc shape. Yes. 4 and FIGS. 5 and 7 to be referred to later, in order to facilitate understanding of the layer structure of the optical disc (optical information medium), the ratio of the thickness of each layer constituting the optical disc and the base material 11 is changed. The ratio is different from the actual thickness ratio. The optical disc 1 is configured such that recording data can be recorded on the information recording layer 12 and read from the information recording layer 12 by irradiation of a laser beam toward the information recording layer 12 from the light transmission layer 13 side. ing. The optical disc 1 is configured such that various symbols and designs can be printed on the printing layer 14 using an ink jet printer or the like.

As shown in FIG. 1, the base material 11 is formed into a disk shape having a thickness of 1.1 mm and an outer diameter of 120 mm by injection molding a resin material such as polycarbonate. A mounting center hole H having an inner diameter of about 15 mm is formed. The information recording layer 12 includes a light reflecting layer 21 and a recording layer 22 as shown in FIG. For example, the light reflecting layer 21 is formed in a thin film shape having a thickness of about 100 nm by sputtering a metal material mainly composed of Ag. As an example, the recording layer 22 includes a second dielectric film having a thickness of about 25 nm formed by sputtering a mixture of ZnS and SiO ₂ and a second dielectric film having a thickness of about 5 nm formed by sputtering using CuAl as a main component. A recording film, a first recording film having a thickness of about 4 nm formed by sputtering with Si as a main component, and a first dielectric film having a thickness of about 25 nm formed by sputtering a mixture of ZnS and SiO ₂ are used as light. It is formed on the reflection layer 21 in this order.

  For example, the light transmission layer 13 is formed into a thin film having a thickness of 100 μm by spin-coating an ultraviolet curable resin composition and then irradiating and curing the ultraviolet rays. The “light transmission layer” is not limited to those formed by applying and curing an ultraviolet curable resin composition, but applying a resin composition that is cured by irradiation with various energy rays other than ultraviolet rays. This includes those that are cured and those that are formed by pasting a light-transmitting resin film on the surface of the information recording layer 12 (recording layer 22). The printing layer 14 is an example of a back layer, and an ink receiving layer for holding ink sprayed by an ink jet printer, and a surface layer coated with a paint mixed with a white pigment and hardened from the substrate 11 side. They are formed in this order (example where “colored back layer” is “white”). The “back layer” is not limited to a layer that can be printed by an ink jet printer like the printing layer 14 described above, and various symbols are used at the time of factory shipment such as a commercially available video disc or music disc. This includes a paint layer formed by printing a pattern.

  In this case, in this optical disc 1, as shown in FIG. 3, as an example, the information recording layer 12 is formed in an annular region whose distance from the disc center C is 14 mm to 59 mm. Further, in this optical disc 1, as an example, it is defined that an annular area whose distance from the disc center C is 22 mm to 59 mm is used as an information area (information area) Ai. Thereby, in this optical disc 1, there is an inner peripheral non-information area A1 (an example of “inner peripheral non-information area”) on the inner peripheral side of the information area Ai, and the outer peripheral side of the information area Ai. The outer peripheral side non-information area (rim area) A2 exists. In this case, in the information area Ai, a system zone Z0, a lead-in zone Z1, a data zone Z2, and a lead-out zone Z3 are defined in this order from the inner periphery side. In the system zone Z0, various areas such as a burst cutting area are defined. On the other hand, a clamping area Ac for clamping the optical disc 1 to the recording / reproducing apparatus is defined in the inner non-information area A1.

  Further, in this optical disc 1, a region (in this example, a distance from the disc center C) that overlaps in the thickness direction of the optical disc 1 with respect to the formation region of the information recording layer 12 in the inner peripheral non-information area A1. Is defined as a symbol recording area Am that can be used. Specifically, in the optical disc 1, as shown in FIG. 2, a concave portion X is formed in the symbol recording area Am, and as shown in FIG. 4, various symbols (for example, “ABCDEFG”) are formed by the concave portion X. Is written). In this case, in this specification, in order to facilitate the understanding of the invention of the optical information medium, an example in which a character string “ABCDEFG” is described will be described. As a symbol to be written in the symbol recording area Am, Items related to the contents of the recorded data recorded on the optical information medium, items related to the user of the optical information medium, items related to the manufacturer of the optical information medium, and items related to the seller or distributor of the optical information medium Arbitrary symbols for various items can be written.

Specifically, the optical disc 1 in which the concave portion X is not formed in the symbol recording area Am (the symbol is not marked) (hereinafter, for optical discs where the symbol is not marked, “x” is added to the end of the symbol. Prepare). In addition, since it is well-known about the manufacturing method (The shaping | molding method of the base material 11, the formation method of the information recording layer 12, the light transmissive layer 13, etc.) of this optical disk 1x, the description is abbreviate | omitted. In this case, the optical disc 1x which has a symbol (formed with a recess X) according to the following procedure is a recorded disc in which recording data is recorded in the data zone Z2, and a blank disc in which no recording data is recorded in the data zone Z2. Either of these may be used. Next, the prepared optical disk 1x is set on a laser marker (for example, an Rf excitation CO ₂ laser: a laser marker of 20 W (MAX)) in such a direction that the surface of the light transmission layer 13 becomes a recording surface (marking surface). To do.

  Next, by operating an operation unit (not shown) of the laser marker, various recording conditions (marking, such as a symbol to be recorded in the symbol recording area Am (for example, a character string “ABCDEFG”), a position where the symbol is written, and a laser output, etc. Specify the condition. In this case, as an example, the laser output is set to 10 W, and the scanning speed is set to 100 mm / second. Subsequently, when the start switch is operated, a laser beam is irradiated onto the symbol recording area Am of the optical disc 1x. At this time, by irradiating the optical disc 1x while being scanned with a laser beam according to the shape of the symbol to be written, the light transmission layer 13 and the information recording layer 12 at the portion irradiated with the laser beam are sublimated by heat and disappear. By doing so, as shown in FIG. 2, a recess X is formed in the irradiated region. At this time, since the laser output is set to 10 W, a recess having a depth of 120 μm is formed on the light transmission layer 13 side in the symbol recording area Am. In this case, in this optical disc 1x, since the information recording layer 12 has a thickness of about 160 nm and the light transmission layer 13 has a thickness of about 100 μm, the concave portion X has a depth reaching the substrate 11. As a result, as shown in FIG. 4, the character string “ABCDEFG” is written in the recess X, and the optical disc 1 is completed.

  In this case, in the optical disc 1, as described above, the recording layer 22 formed of various recording layer forming materials is formed on the light reflecting layer 21 formed of a metal material mainly composed of Ag, thereby recording information. A layer 12 is formed, and a light transmission layer 13 made of a resin material is formed so as to cover the information recording layer 12. Accordingly, when the formation region of the information recording layer 12 is viewed from the light transmitting layer 13 side, the light reflecting layer 21 reflects the light so that the visual recognition of the printed layer 14 is restricted. The recording layer 22 formed thereon is visible through the light transmission layer 13. For this reason, when the formation region of the information recording layer 12 is viewed from the light transmission layer 13 side, the color of the recording layer forming material forming the recording layer 22 on the optical disc 1 (dark blue color as an example) Visible to.

  On the other hand, in the part where the recess X having a depth reaching the base material 11 is formed, light is not reflected by the light reflection layer 21 when seen from the light transmission layer 13 side, and the base material 11 is transmitted through. Thus, the printed layer 14 is visually recognized. At this time, in this optical disc 1, since the print layer 14 is formed with a layer coated with a paint mixed with a white pigment and cured, the portion where the recess X is formed is located on the light transmission layer 13 side. When viewed from above, the printed layer 14 is visually recognized as white. Accordingly, an area that overlaps the formation area of the information recording layer 12 in the thickness direction of the optical disc 1 in the inner peripheral non-information area A1 is defined as the symbol recording area Am, and the recess X is formed in the symbol recording area Am. In the optical disk 1 in which the symbol is written, the character (“ABCDEFG”) of the color (white in this example) of the printing layer 14 is in the region of the color of the recording layer forming material (dark blue in this example). Column). Thereafter, if necessary, an arbitrary design or symbol can be printed on the printing layer 14 using an ink jet printer or the like.

  Thus, according to this optical disc 1, in the inner peripheral side non-information area A1 of the optical disc 1, the region overlapping the formation region of the information recording layer 12 in the thickness direction of the optical disc 1 (in this example, the symbol recording area Am) A concave portion X is formed on the light transmitting layer 13 side, and a symbol (in this example, a character string of “ABCDEFG”) is written on the inner peripheral non-information area A1 by the concave portion X so that printing can be performed with an inkjet printer or the like. Unlike the symbols printed on the layer 14, the symbols are written by the physically formed recesses X. Therefore, for example, even if it is touched with a sweaty hand, bleeding does not occur, so that it is possible to reliably avoid a situation in which the aesthetic appearance is impaired. Further, by providing an arbitrary symbol on the side of the light transmission layer 13 in the inner peripheral non-information area A1 where no symbol is marked on a general optical disc, the optical disc 1 having sufficiently high interest is provided. can do. Further, since the symbols are written in the symbol recording area Am defined in the inner non-information area A1, there is a situation where the written symbols (recesses X) hinder access to the information area Ai. The optical disc 1 can be used without inviting.

  In addition, according to the optical disc 1, since the symbol is written by the recess X having a depth reaching the substrate 11, the portion where the recess X is formed (the site indicated by the symbol) when viewed from the light transmitting layer 13 side. ), The light is not reflected by the light reflecting layer 21, and the recording layer 22 and the light reflecting layer 21 are not present, so that the color is different from the material forming the layers constituting these layers. Since the symbol is visually recognized, the visibility can be sufficiently improved.

  Furthermore, according to this optical disc 1, the region that overlaps in the thickness direction with respect to the symbol recording area Am on which at least the symbol is marked on the surface of the substrate 11 opposite to the surface on which the light transmission layer 13 is formed (in this example, By forming a colored back layer (in this example, the white print layer 14) on the inner peripheral non-information area A1, the information area Ai, and the outer peripheral non-information area A2, the light transmitting layer 13 side is formed. When viewed, since the colored back layer is visually recognized at the site where the recess X is formed (the site where the symbol is marked), the visibility of the symbol can be further improved. Further, by setting the color of the back layer to an arbitrary color, it is possible to provide the optical disk 1 having a high preference with a symbol of an arbitrary color written thereon.

  In addition, about the recessed part formed in order to write a symbol, it is not limited to the thing of the depth which reaches the base material 11 like the recessed part X formed in said optical disk 1 grade | etc.,. For example, an arbitrary symbol may be written by forming the recess Xa so as to have a depth within the range of the thickness of the light transmission layer 13 as in the optical disc 1A shown in FIG. In this optical disk 1A and optical disks 1B to 1D (see FIGS. 6 to 9) described later, the same components as those of the optical disk 1 described above are denoted by the same reference numerals, and redundant description is omitted. According to the optical disc 1A, the symbol is given by the recess X formed within the thickness range of the light transmission layer 13, so that the information recording layer 12 is not exposed to the outside air at the formation site of the recess Xa. Since it is in a covered state, the information recording layer 12 can be prevented from deteriorating at the site where the recess Xa is formed.

  Further, the example in which the symbols are written on the single-sided single-layer optical discs 1 and 1A has been described, but the symbols may be written on, for example, single-sided, double-layered optical discs as in the optical discs 1B to 1D shown in FIG. In this case, as shown in FIGS. 7 to 9, in the optical disks 1 </ b> B to 1 </ b> D, the information recording layer 12 b, the intermediate layer 15, the information recording layer 12 a and the light transmission layer 13 are formed on one surface of the substrate 11 in this order. The printing layer 14 is formed on the other surface of the substrate. Since the information recording layers 12a and 12b are configured in the same manner as the information recording layer 12 in the optical discs 1 and 1A described above, detailed description thereof is omitted. In this case, as shown in FIG. 6, in the single-sided dual-layer optical discs 1B to 1D, as an example, the information recording layer 12a on the light transmission layer 13 side is the same as the information recording layer 12 in the optical discs 1 and 1A described above. Whereas each area and zone is defined, the information recording layer 12b on the substrate 11 side has no system zone Z0, and the lead-in zone Z1, the data zone Z2, and the lead-out zone Z3 have outer peripheries. They are defined in this order from the side toward the inner periphery.

  In this case, as shown in FIG. 7, according to the optical disc 1 </ b> B marked with the formation of the recess Xb having a depth reaching the substrate 11, the same effect as the optical disc 1 described above can be obtained. Further, as shown in FIG. 8, according to the optical disc 1C in which the symbol is written by forming the recess Xc within the thickness range of the light transmission layer 13, the same effect as the optical disc 1A described above can be obtained. Furthermore, as shown in FIG. 9, the optical disk 1D is marked with a symbol by forming a recess Xd that reaches the intermediate layer 15 between the information recording layers 12a and 12b and does not penetrate the information recording layer 12b. However, in the same manner as the optical discs 1 and 1A to 1C, it is possible to provide an optical disc having a sufficiently high taste without impairing its beauty. In addition, the optical disk 1 having the symbols formed by forming the recesses X and Xa to Xd in the symbol recording areas Am in the optical disks 1 and 1A to 1D having the back layer such as the printing layer 14 has been described as an example. The symbols may be written by forming recesses X, Xa to Xd in the symbol recording area Am in an optical disc (not shown) that does not include the printing layer 14.

  Further, the rewritable optical discs 1 and 1A to 1D have been described as examples. However, in the write-once disc and the read-only disc, the concave portion similar to the concave portion X (Xa to Xd) is formed in the symbol recording area Am. By writing an arbitrary symbol, the same effects as those of the optical discs 1 and 1A to 1D can be obtained. In addition, the single-sided single-layer optical discs 1 and 1A and the single-sided dual-layer optical discs 1B to 1D have been described as examples. However, even in a multi-layer disc having three or more single-sided layers, a concave portion similar to the concave portion X (Xa to Xd) By writing an arbitrary symbol in the symbol recording area Am by formation, the same effects as those of the optical discs 1 and 1A to 1D can be obtained.

DESCRIPTION OF SYMBOLS 1,1A-1D Optical disk 11 Base material 12,12a, 12b Information recording layer 13 Light transmission layer 14 Printing layer 15 Intermediate layer 21 Light reflection layer 22 Recording layer A1 Inner side non-information area Ai Information area Am Symbol recording area X, Xa to Xd recess

Claims (4)

A laser comprising: a base material; an information recording layer formed on the base material; and a light transmission layer formed on the information recording layer, the laser facing the information recording layer from the light transmission layer side An optical information medium configured to be able to read out recorded data from the information recording layer by beam irradiation,
In the non-information area on the inner peripheral side of the optical information medium, a recess is formed on the light transmission layer side of the area overlapping the formation area of the information recording layer in the thickness direction of the optical information medium. An optical information medium in which symbols are written in the non-information area on the inner circumference side.   The optical information medium according to claim 1, wherein the recess is formed to a depth reaching the base material.   The colored back layer is formed in the area | region which overlaps with the said thickness direction with respect to the said area | region where the said symbol was described at least in the surface on the opposite side to the formation surface of the said light transmissive layer in the said base material. Optical information media.   The optical information medium according to claim 1, wherein the recess is formed within a thickness range of the light transmission layer.

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