JP2008041233A - Optical information recording medium and its display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium which can draw images visible from the label side without turning it over and without restricting the data recording areas. <P>SOLUTION: This optical information recording medium 20 has a recording layer 12 and a first translucent reflection layer 13 on either one surface of a first transparent base plate 11 and can record information by irradiating it with a laser beam from the other side of the base plate. It has a second transparent base plate 14 stuck to the side having the recording layer and the first translucent reflection layer 15 of the first transparent base plate, a second translucent reflection layer 15 formed on the second transparent base plate, a layer 17 formed on the second translucent reflection layer to emit coloring matters by absorbing laser beams, and a layer 18 formed on it with many gaps to absorb emitted coloring matters. Thus, it can draw images visible from the label side without turning it over and without restricting the data recording areas. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disc-shaped optical information recording medium, and relates to an optical information recording medium capable of forming a drawing visible from the label surface side by laser light irradiation, and a display method on the optical information recording medium.

  A disc-shaped optical information recording medium such as a CD-R, DVD ± R, or Blu-ray disc has a structure in which a recording layer and a reflective layer are formed on one surface of a translucent substrate, Data is recorded on the recording layer by being irradiated with laser light from the surface side. Further, the surface opposite to the surface irradiated with the laser beam of the optical information recording medium is usually used as a label surface, and characters, symbols, figures, patterns or combinations thereof are printed on the surface by printing or the like. Is displayed.

Various optical information recording media have been proposed in which the display is performed by laser light irradiation.
For example, Patent Document 1 proposes a technique in which a region (layer) that can be drawn by laser light irradiation is formed on the label surface 125 side. Specifically, as shown in FIG. 3, a dielectric layer 105, a recording layer 107, a dielectric layer 109, and a reflective layer 111 are sequentially formed on one surface of a transparent first substrate 103, and the reflective layer 111 is further formed. A second substrate 115 is bonded to the surface of the second substrate 115 by a bonding adhesive layer 113, and a second reflective layer 117, an intermediate layer 119, a visible light characteristic changing layer 121, and a protective layer 123 are sequentially formed on the surface of the second substrate 115. Are stacked. Data recording on the recording layer 107 is performed by irradiating the recording layer 107 with laser light from the other surface side of the first substrate 103, and image formation on the label surface 125 side is performed by laser from the label surface 125 side. This is performed by irradiating the visible light characteristic changing layer 121 with light.
Japanese Patent Application Laid-Open No. 2004-228561 proposes a method in which a part of an area for recording data is allocated to an area for drawing characters and images.

Japanese Patent Laid-Open No. 2002-203321 JP 2003-051118 A

  However, in the former background art, since the drawing area is opposite to the data recording surface, it is necessary to turn over the optical information recording medium when drawing. In the latter background art, since a part of the data recording area is used for drawing, it is necessary to prevent the data recording and drawing from interfering with each other, and there is a problem that the data recording area and the drawing area are limited. .

  An object of the present invention is to solve the above-mentioned problems, optical information capable of drawing visible from the label surface side without limiting the data recording area and without inverting the optical information recording medium. A recording medium is proposed.

In order to achieve the above object, the optical information recording medium of the present invention comprises:
(1) By having a recording layer and a first transflective layer on one surface of the first translucent substrate and irradiating the recording layer with laser light from the other surface side of the substrate In an optical information recording medium capable of recording information,
A second translucent substrate bonded to a surface of the first translucent substrate having the recording layer and the first transflective layer; and on the second translucent substrate. The formed second transflective layer, the layer formed on the second transflective layer that absorbs laser light and emits the dye, and the layer that emits the dye are emitted. And a layer having a large number of voids that absorb the dye. (... Hereinafter referred to as the first problem solving means of the present invention.)

One of the main forms of the optical information recording medium is
(2) A transparent protective layer is disposed on the layer having a large number of voids. (... Hereinafter referred to as the second problem solving means of the present invention.)

One of the other main forms of the optical information recording medium is
(3) A tracking spiral groove is formed on the surface of the second translucent substrate on the side where the second transflective layer is formed. (... Hereinafter referred to as the third problem solving means of the present invention.)

Moreover, the display method of the optical information recording medium of the present invention includes:
(4) A recording layer and a first transflective layer are formed in order from the substrate side on one surface of the first translucent substrate, and further, the recording layer of the first translucent substrate, The second transflective layer and a layer that absorbs laser light and emits a dye are emitted through a second translucent substrate bonded to the surface having the first transflective layer. A method of performing display on an optical information recording medium in which a layer having a large number of voids for absorbing the dye is formed,
The layer that emits the dye is irradiated with laser light from the same side to which the laser light is irradiated during data recording via the second transflective layer. (... Hereinafter referred to as the fourth problem solving means of the present invention.)

One of the main forms of the display method of the optical information recording medium of the present invention is
(5) The recording layer is irradiated with laser light and the dye emitting layer is irradiated with laser light simultaneously. (... Hereinafter referred to as the fifth problem solving means of the present invention.)

The operation of the first problem solving means is as follows. That is, a layer in which a part of the laser light irradiated from the other surface side of the first translucent substrate emits the dye via the second translucent substrate and the second transflective layer The layer that emits the dye absorbs the irradiated laser light, and the dye decomposes to increase the volume and release the dye. The released dye diffuses and is absorbed in the voids of the layer having a large number of voids, and color development (discoloration) occurs in the layer having a large number of voids. (Hue, lightness, saturation), spectrum, reflectance, transmitted light, light scattering, etc.) change and the drawing can be visually recognized.
Further, since a part of the laser light irradiated at the time of drawing is reflected by the second transflective layer and returned to the optical recording apparatus, the focus of the laser light at the time of drawing can be stably controlled.

  The operation of the second problem solving means is as follows. That is, since a transparent protective layer is disposed on the layer having a large number of voids, it is possible to prevent deterioration of each layer from the label surface (gap layer) side and the like through the protective layer. The drawing formed in the gap layer can be clearly seen from the label surface side.

  The operation of the third problem solving means is as follows. That is, since a tracking spiral groove is formed on the surface of the second translucent substrate on the side where the second transflective layer is formed, a reference for positioning the spiral groove at the time of drawing is formed. As described above, laser light can be irradiated to an arbitrary position.

The operation of the fourth problem solving means is as follows. That is, the laser beam is irradiated from the same side as the side irradiated with the laser beam during data recording to the layer that emits the dye through the second translucent substrate and the second transflective layer. A part of the laser light irradiated from the side of the light-transmitting substrate 1 is irradiated to the layer that emits the dye through the second light-transmitting substrate and the second transflective layer. The layer that emits the dye absorbs the laser light, and the dye in the layer that emits the dye is decomposed to increase the volume and release the dye. The released dye is diffused and absorbed in the voids of the layer having a large number of voids, and the layer having the large voids is colored (discolored) to form a drawing that is visible from the outside.
In addition, a part of the laser light irradiated at the time of drawing is reflected by the second transflective layer and a certain amount of reflected light is returned to the optical recording device, so that the laser light at the time of drawing can be stably controlled. can do.

The operation of the fifth problem solving means is as follows. That is, even when the laser beam irradiation to the recording layer and the laser beam irradiation to the layer that emits the dye are performed simultaneously, the recording layer of the data recording unit and the dye of the drawing recording unit are formed by the second light-transmitting substrate. The distance to the layer that emits light is secured, and each of the irradiated laser beams can be condensed well and independently.
Further, even when the laser light irradiation to the recording layer and the laser light irradiation to the layer emitting the dye are performed simultaneously, the recording layer of the data recording unit and the dye of the drawing recording unit are formed by the second translucent substrate. Since the distance to the layer that emits is secured, it is possible to separate the influence of heat emitted from the recording layer of the data recording unit and the layer that emits the dye of the drawing recording unit by laser light irradiation, The dye released from the dye releasing layer can be prevented from diffusing into the recording layer, and recording can be performed independently on each layer.

According to the optical information recording medium of the present invention, it is possible to perform drawing that is visible from the label surface side without limiting the area for recording data and without inverting the optical information recording medium.
Further, according to the method for displaying an optical information recording medium of the present invention, it is possible to perform drawing that is visible from the label surface side without inverting the optical information recording medium. Further, since a part of the laser light irradiated at the time of drawing is reflected by the second transflective layer and returned to the optical recording apparatus, the focus of the laser light at the time of drawing can be stably controlled.
The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

  Hereinafter, a first embodiment of the optical information recording medium of the present invention will be described with reference to FIG. FIG. 1 is a partially enlarged cross-sectional view showing the internal structure of the optical information recording medium 20 of the first embodiment.

  As shown in FIG. 1, the optical information recording medium 20 of this embodiment has a structure in which a data recording part A and a drawing recording part B are bonded together by an adhesive layer 21.

  Specifically, the recording layer 12 and the first transflective layer 13 are provided on one surface of the first translucent substrate 11, and the recording layer 12 is formed from the other surface side of the substrate 11. An optical information recording medium 20 capable of recording information by irradiating a laser beam, on the side having the recording layer 12 and the first transflective layer 13 of the first translucent substrate 11. A second translucent substrate 14 bonded to the surface, a second transflective layer 15 formed on the second translucent substrate 14, and an upper surface of the second transflective layer 15; It has a layer 17 that is formed and absorbs laser light to emit a dye, and a layer 18 that has a large number of voids that are formed on the layer 17 that emits the dye and absorb the emitted dye.

  In the present embodiment, a transparent protective layer 19 is disposed on the layer 18 having a large number of voids.

  In this embodiment, a tracking spiral groove 23 is formed on the surface of the second translucent substrate 14 on the side where the second transflective layer 15 is formed. Therefore, the second transflective layer 15 formed on the second translucent substrate 14 is along the surface of the second translucent substrate 14 on which the tracking spiral groove 23 is formed. The layer 17 for releasing the dye formed on the second transflective layer 15 has a tracking spiral shape on the surface of the second transflective layer 15. It is formed so as to fill a recess along the groove. The layer 18 having a large number of voids that are formed on the layer 17 that emits the pigment and absorbs the emitted pigment, and the transparent protective layer 19 that is formed on the layer 18 having the numerous voids are: All of them are flat and have a substantially uniform thickness.

  Further, the optical information recording medium 20 of the present embodiment includes a second transflective layer 15 on the second translucent substrate 14, a layer 17 that absorbs laser light and emits a dye, and the emitted dye. The structure is almost the same as that of a normal DVD-R optical disk except that there are a layer 18 having a large number of voids to be absorbed and a transparent protective layer 19. From the label side, the layer 18 having a large number of voids can be desired through a transparent protective layer 19.

  A preferred embodiment of the first translucent substrate 11 is as follows. That is, it is made of a transparent resin such as polycarbonate or acrylic resin, and is formed on a substrate having a predetermined shape (a donut shape for an optical disk) by a method such as injection molding. Moreover, not only this but an ultraviolet curable resin can also be used.

  A preferred embodiment of the recording layer 12 is as follows. That is, it contains an organic dye, and pits are formed by irradiation with laser light having a predetermined wavelength, and data is recorded. As the organic dye, phthalocyanine, cyanine and azo dyes are preferable. The recording layer 12 records data information such as music, images, and computer programs by irradiating laser light having the same or different wavelength as the laser light irradiated to the layer 17 that absorbs the laser light and emits the dye. / Or can be played back.

A preferred embodiment of the first transflective layer 13 is as follows. That is, it reflects a laser beam for recording and / or reproducing data and passes a laser beam for recording drawing, and is a metal (for example, Ag, Ag alloy, Al, etc.) film or an oxide film having a different refractive index. A dielectric multilayer film in which is laminated is used.
In order to further increase the reflectivity of the DVD data recording laser beam and the transmittance of the drawing recording laser beam, it is preferable to appropriately select and use a dielectric multilayer film in which the material and thickness of the metal film are controlled. The first transflective layer 13 and the recording layer 12 can also be realized by a configuration corresponding to the L0 layer in the DVD + R Dual standard.

  A preferred embodiment of the adhesive layer 21 is as follows. That is, an epoxy adhesive and an acrylic adhesive are preferable.

A preferred embodiment of the second translucent substrate 14 is as follows. That is, the same material as that of the first translucent substrate 11 can be used. As a result, the data recording portion A created on the first light transmissive substrate 11 and the drawing recording portion B formed on the second light transmissive substrate 14 are integrated by diverting the DVD-R bonding process. it can.
The second translucent substrate 14 plays a role of securing a distance between the recording layer 12 of the data recording portion A and the layer 17 that absorbs the laser light of the drawing recording portion B and emits the dye. For this reason, for example, the thickness of the second translucent substrate 14 is adjusted so that the distance from the first translucent substrate 11 that is the laser light incident surface to the protective layer 19 is equivalent to the CD-R standard. As a result, each laser beam applied to the layer 17 that absorbs the laser beam of the recording layer 12 of the data recording unit A and the drawing recording unit B and emits the dye can be condensed well and independently. Further, the effects of heat emitted from the recording layer 12 of the data recording section A and the layer 17 that emits the dye of the drawing recording section B can be separated by laser light irradiation, and the layer 17 that emits the dye. Can be prevented from diffusing into the recording layer 12.

  A preferred embodiment of the second transflective layer 15 is as follows. In other words, a part of the laser light irradiated on this layer is reflected and returned to the optical recording apparatus, thereby enabling stable focus control. Further, the second transflective layer 15 can transmit a part of the laser light irradiated to this layer and allow all of the transmitted light to reach the layer 17 that emits the dye. The second transflective layer 15 is a dielectric multilayer in which metal (for example, Ag, Ag alloy, Al, etc.) films or oxide films having different refractive indexes are laminated as in the first transflective layer 13. A membrane is used. In the second transflective layer 15, the amount of reflected light can be adjusted by the material and film thickness constituting the second transflective layer, so that stable reflected light can be easily supplied.

A preferred embodiment of the layer 17 that absorbs the laser beam and emits the dye is as follows. That is, the layer is composed of an organic ink layer or the like containing an organic dye that includes the wavelength of the laser beam irradiated to this layer in its own light absorption wavelength range and absorbs and decomposes the laser beam to increase its volume. As the organic dye, phthalocyanine, cyanine, and azo dyes are suitable as in the recording layer 12, but it is preferable to use an organic dye having a light absorption characteristic different from that of the recording layer 12.
In addition, the layer 17 for releasing the dye has a single layer structure in which materials having different molecular structures are mixed or a multilayer structure in which materials having different molecular structures are separated from each other for the purpose of increasing decomposition efficiency. Can do.
In addition, a pigment or the like can be used in combination for the purpose of adjusting the color difference before drawing.
The layer 17 that absorbs the laser light and releases the dye absorbs the irradiated laser light, decomposes the dye in the layer that releases the dye, increases its volume, and releases the dye. The released dye can be diffused into the voids of the layer 18 having a large number of voids.
In addition, the pigment | dye in this invention means the component which gives a color to an object.

  A preferred embodiment of the layer 18 with multiple voids that absorb the released dye is as follows. That is, a polymer material or the like in which a pigment is dispersed (polyvinyl alcohol or the like) can be used. Specifically, an inorganic pigment such as alumina or an aromatic organic pigment is dispersed in PVA (polyvinyl alcohol), and a solvent or the like. It is preferable to use a material in which after the lattice structure in which single molecules are uniformly dispersed is assembled, the solvent evaporates and the solvent evaporation traces become voids. The size of the voids of the layer 18 having a large number of voids is preferably 0.1 to 10 μm, and this can scatter visible light. Therefore, from the layer 17 that releases the dye into the voids. When the emitted pigment is diffused and absorbed, the contrast before and after the drawing can be increased. In the layer 18 having a large number of voids, music information, image information, titles and indexes corresponding to programs recorded on the recording layer 12 can be recorded as visible drawing information.

  A preferred embodiment of the protective layer 19 is as follows. That is, it is made of a transparent resin such as an acrylic ultraviolet curable resin or a solvent-soluble polymer resin, and prevents deterioration on the label surface side having the layer 18 having a large number of voids.

  Next, a first embodiment of the optical information recording medium display method of the present invention will be described with reference to FIG. FIG. 1 is a partial enlarged cross-sectional view for explaining the display method of the optical information recording medium of the first embodiment.

As shown in FIG. 1, the optical information recording medium 20 of the present embodiment has a structure in which a data recording portion A and a drawing recording portion B are bonded together by an adhesive layer 21, so that a drawing recording laser beam is used for data recording. Irradiation is performed from the other surface side of the first translucent substrate 11 which is the same as the laser beam for use. The drawing and recording laser light is transmitted through the first translucent substrate 11, the recording layer 12, the first transflective layer 13, the adhesive layer 21, the second translucent substrate 14, and the second transflective layer 15. Is absorbed by the layer 17 that absorbs the laser light and emits the dye, and the dye of the layer 17 that emits the dye is decomposed to increase the volume and release the dye. The released dye diffuses and is absorbed in the voids of the layer 18 having a large number of voids, and color development or discoloration occurs in the layer 18 having the large number of voids. From the label surface side through the transparent protective layer 19 Recorded as a visible drawing.
The focal lengths of the data recording laser beam irradiated to the recording layer 12 of the data recording unit A and the drawing recording laser beam irradiated to the layer 17 that absorbs the laser beam of the drawing recording unit B and emits the dye are different. Therefore, even when laser beams having the same wavelength are used, they can be prevented from interfering with each other by the focus control of the optical recording apparatus. Further, the light absorption characteristics (absorbance) of the data recording laser beam irradiated to the recording layer 12 of the data recording unit A and the drawing recording laser beam irradiated to the dye emitting layer 17 of the drawing recording unit B are different. May be allowed. Specifically, the absorbance peak difference may be 75 nm, preferably 100 nm, and more preferably 125 nm. For example, in the case of DVD, the wavelength of the laser beam for recording is generally around 660 nm, so that the wavelength of the laser beam for drawing and recording can be 785 nm.

  Some optical recording apparatuses capable of recording on both DVD ± R and CD-R, so-called multi-drives, have both a laser light source for DVD ± R and a laser light source for CD-R. . When such a multi-drive is used, by using both light sources, the laser recording of the drawing recording unit B is absorbed simultaneously with the data recording on the recording layer 12 of the data recording unit A to the layer 17 that emits the dye. Laser irradiation becomes possible. Such a thing can be implemented by software for controlling the optical recording apparatus (not shown).

  Next, a second embodiment of the optical information recording medium of the present invention will be described with reference to FIG. FIG. 2 is a partially enlarged cross-sectional view showing the internal structure of the optical information recording medium 40 of the second embodiment.

  As shown in FIG. 2, the optical information recording medium 40 of the present embodiment has a structure in which a data recording portion A and a drawing recording portion B are bonded by an adhesive layer 41, in the first embodiment. It is the same.

  Specifically, the recording layer 32 and the first transflective layer 33 are provided on one surface of the first translucent substrate 31, and laser light is irradiated from the other surface side of the substrate 31. This is an optical information recording medium 40 capable of recording information, and is bonded to the surface of the first translucent substrate 31 having the recording layer 32 and the first transflective layer 33. A second translucent substrate 34; a second transflective layer 35 formed on the second translucent substrate 34; and a laser beam formed on the second transflective layer 35. It has a layer 37 that absorbs and releases a dye, and a layer 38 that has a number of voids that are formed on the layer 37 that releases the dye and absorb the released dye.

  In this embodiment, a transparent protective layer 39 is disposed on the layer 38 having a large number of voids.

In the present embodiment, the first translucent substrate 34 is provided with a tracking spiral groove on the surface on the side where the second transflective layer 35 is formed. Different from the embodiment.
Therefore, a second transflective layer 35 formed on the second translucent substrate 34 and a layer formed on the second transflective layer 35 that absorbs laser light and emits a dye. 37, a layer 38 formed on the layer 37 that emits the dye and having a large number of voids for absorbing the emitted dye, and a transparent protective layer 39 formed on the layer 38 having the large number of voids Are both flat and have a uniform thickness. Other configurations and operational effects are the same as those of the first embodiment, and are omitted.

  In the above embodiment, an optical information recording medium having a DVD ± R disk structure is shown. However, the present invention is not limited to this, and various optical information recording media such as a CD-R, an HD-DVD, a Blu-ray disc, etc. Can be applied to.

It is a partial expanded sectional view which shows the internal structure of 1st Embodiment of the optical information recording medium of this invention. It is a partial expanded sectional view which shows the internal structure of 2nd Embodiment of the optical information recording medium of this invention. It is a partial expanded sectional view which shows an example of background art.

Explanation of symbols

11: first translucent substrate 12: recording layer 13: first transflective layer 14: second translucent substrate 15: second transflective layer 17: dye emitting layer 18: many Layer 19: protective layer 20: optical information recording medium 21: adhesive layer 22: spiral groove 23: spiral groove 31: first translucent substrate 32: recording layer 33: first half Transmitting / reflecting layer 34: second translucent substrate 35: second transflective layer 37: layer emitting dye 38: layer 39 having many voids: protective layer 40: optical information recording medium 41: adhesion Agent layer 42: spiral groove A: data recording part B: drawing recording part

Claims (5)

A recording layer and a first transflective layer are provided on one surface of the first translucent substrate, and information is recorded by irradiating the recording layer with laser light from the other surface side of the substrate. In a possible optical information recording medium,
A second translucent substrate bonded to a surface of the first translucent substrate having the recording layer and the first transflective layer; and on the second translucent substrate. The formed second transflective layer, the layer formed on the second transflective layer that absorbs laser light and emits the dye, and the layer that emits the dye are emitted. An optical information recording medium comprising: a layer having a large number of voids that absorb a dye.   The optical information recording medium according to claim 1, wherein a transparent protective layer is disposed on the layer having a large number of voids.   2. The optical information recording according to claim 1, wherein a spiral groove for tracking is formed on a surface of the second translucent substrate on the side where the second transflective layer is formed. Medium. A recording layer and a first transflective layer are formed in order from the substrate side on one surface of the first translucent substrate, and the recording layer and the first translucent layer of the first translucent substrate are further formed. The second transflective layer, a layer that absorbs laser light and emits a dye through a second translucent substrate bonded to the surface having the semitransparent reflective layer, and the emitted dye A method of displaying on an optical information recording medium formed with a layer having a large number of gaps to absorb,
A display method for an optical information recording medium, wherein a laser beam is irradiated to a layer from which the dye is emitted from the same side to which a laser beam is irradiated during data recording via the second transflective layer.   5. The method for displaying an optical information recording medium according to claim 4, wherein the laser light irradiation to the recording layer and the laser light irradiation to the layer emitting the dye are performed simultaneously.

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