HK1108299A - Optical information recording medium and display rendering method thereof - Google Patents

Abstract

The present invention provides an optical information-recording medium. Thus, rendering can be performed by an optical information-recording device without flipping over the optical information-recording medium, and without interfering with the data-recording region. An optical information-recording medium 1 has a recording layer 3, a semi-transmissive reflective layer 4, a heat-generating layer 5, a reflective layer 6, a deformation layer 7, and a protective layer 8 formed sequentially on a first translucent substrate 2, and the reflective layer 6 and deformation layer 7 are deformed by heat by irradiating the heat-generating layer 5 with a laser beam. Diffused reflection of visible light at the deformed reflecting layer forms an image.

Description

Optical information recording medium and display method thereof

Technical Field

The present invention provides an optical information recording medium and a display method using drawing for display, the optical information recording medium being an optical information recording medium such as a DVD (Digital Video disc) ± R, and having a structure capable of drawing by laser light irradiation.

Background

An optical information recording medium such as a Compact Disc (CD) -R, DVD ± R or blu-ray Disc has a structure in which a recording layer and a reflective layer are formed on a light transmissive substrate having a diameter of 12cm or 8 cm. In the case of CD-R, the recording layer and the reflective layer were formed on a transparent substrate having a thickness of 1.2mm, but in the case of DVD ± R, the thickness of the first transparent substrate having the recording layer and the reflective layer was set to 0.6mm in order to realize high-density recording. Therefore, in order to adjust the thickness of the DVD + -R to the thickness of the CD-R, a second transparent substrate having the same shape and a thickness of 0.6mm was laminated to form the DVD + -R.

The second light-transmitting substrate is generally used as a label surface, and characters, symbols, figures, patterns, or a combination thereof are printed and displayed on the surface of the second light-transmitting substrate. In addition, a printable layer may be provided on the surface, and an image or characters may be printed on the printable layer by an ink jet printer or the like.

In the optical information recording medium, although an image or a character can be easily printed on the label surface, a dedicated device or a compatible device is required for printing. Therefore, recently, a technique for drawing on an optical information recording medium by using a laser beam using an optical information recording device has been proposed. For example, japanese patent laid-open nos. 2002-203321 and 2000-173096 propose optical information recording media in which a region (layer) that can be drawn by irradiating laser light is formed on the label surface of the optical information recording medium and the drawing can be easily performed using an optical information recording device. Further, japanese patent laid-open publication No. 2003-: a part of the area for recording data is allocated to the area for drawing an image or a character, and information can be recorded and drawn without reversing the optical information recording medium.

[ patent document 1] Japanese patent application laid-open No. 2002-203321

[ patent document 2] Japanese patent laid-open No. 2000-173096

[ patent document 3] Japanese patent laid-open No. 2003-051118

Disclosure of Invention

However, there are problems in the proposed technique as follows. In japanese patent laid-open nos. 2002-203321 and 2000-173096, since the drawing region is on the opposite side of the information recording surface, the optical information recording medium must be inverted when drawing is performed. Further, when drawing is performed by the optical information recording apparatus, the laser irradiation position must be specified by a means for detecting position information such as LPP (Land-Pre-Pit) or ADIP (address-in-Pre-groove), but since the means for detecting position information is not provided on the label surface side, the means must be provided on the label surface side. In addition, in japanese patent laid-open No. 2003-051118, since a part of the data recording area is used for drawing, there is a problem that the data recording and drawing do not interfere with each other, and the data recording area and the drawing area are limited. The invention provides an optical information recording medium which can be drawn by an optical information recording device without reversing the optical information recording medium and can be drawn without disturbing a data recording region.

The present invention provides an optical information recording medium, characterized in that: on the surface opposite to the light incidence side of the first translucent substrate, a recording layer and a transflective layer are formed in this order, and a heat generating layer, a reflective layer, and a deformation layer are formed in this order from the light incidence side on the side where the recording layer and the transflective layer are formed. Further, the deformation layer may be formed of a transparent resin that is thermally deformed, and a space may be provided on a side in contact with the reflection layer. Also, a protective layer may be further formed on the transformation layer.

Further, the present invention provides an optical information recording medium, characterized in that: a second transparent substrate is bonded to the first transparent substrate on the side where the recording layer and the transflective layer are formed, with an adhesive layer interposed therebetween.

As an example of the form of the optical information recording medium, there is provided an optical information recording medium in which a heat generating layer, a reflective layer, and a deformable layer are formed in this order on the side of the first translucent substrate on which the recording layer and the semi-transmissive reflective layer are formed, and the second translucent substrate is bonded to the first translucent substrate with an adhesive layer interposed therebetween. In this case, the adhesive layer and the deformation layer are common, that is, the adhesive layer may double as the deformation layer.

In another aspect, there is provided an optical information recording medium in which a deformable layer, a reflective layer, and a heat generating layer are formed in this order on one surface of the second translucent substrate, and the recording layer and the transflective layer of the first translucent substrate are bonded to the deformable layer, the reflective layer, and the heat generating layer of the second translucent substrate with an adhesive layer interposed therebetween.

In another aspect, there is provided an optical information recording medium in which a second transparent substrate is bonded to the first transparent substrate on the side where the recording layer and the transflective layer are formed, with an adhesive layer interposed therebetween, and a heat generating layer, a reflective layer, and a deformable layer are formed in this order on the surface opposite to the surface of the second transparent substrate bonded thereto. Here, a spiral groove in which positional information in a rotational direction is recorded may be formed on the second translucent substrate on the side where the heat generating layer and the reflecting layer are formed.

Further, the present invention provides an optical information recording medium, characterized in that: a semi-transmitting reflection layer, a recording layer, and a light transmission layer are formed in this order on the light incident surface side of a first translucent substrate, and a heat generation layer, a reflection layer, and a deformation layer are formed in this order from the light incident direction on the surface of the first translucent substrate on the side opposite to the recording layer and the semi-transmitting reflection layer.

Further, the present invention provides a display method of an optical information recording medium, comprising: the method is a method for displaying on an optical information recording medium, wherein a recording layer and a semi-transmissive/reflective layer are formed on one surface of a first translucent substrate, a heat generating layer, a reflective layer, and a deformable layer are further formed in this order from a light incident direction, and the heat generating layer is irradiated with a laser light from the same side as the side irradiated with the laser light at the time of recording information, thereby displaying on the optical information recording medium. Further, the recording layer may be irradiated with laser light, and the heat generating layer may be irradiated with laser light.

According to the present invention, since the laser beam for drawing can be irradiated from the same side as the laser beam for recording data, drawing can be performed by the optical information recording apparatus without reversely positioning the optical information recording medium. Further, since the conventional position information detecting means such as LPP or ADIP can be used as the means for detecting the position information at the time of drawing, it is not necessary to newly provide the position information detecting means on the label surface. Further, since the data recording region and the drawing region can be distinguished from each other, an optical information recording medium can be obtained which can perform drawing without interfering with the data recording region.

Drawings

FIG. 1 is a schematic cross-sectional view showing a first embodiment of an optical information recording medium of the present invention.

FIG. 2 is a schematic cross-sectional view showing the operation of the optical information recording medium of the present invention.

FIG. 3 is a schematic cross-sectional view showing one embodiment of a second embodiment of an optical information recording medium according to the present invention.

FIG. 4 is a schematic cross-sectional view showing another embodiment of the second embodiment of the optical information recording medium of the present invention.

FIG. 5 is a schematic cross-sectional view showing a third embodiment of the optical information recording medium of the present invention.

FIG. 6 is a schematic cross-sectional view showing a fourth embodiment of the optical information recording medium of the present invention.

FIG. 7 is a schematic cross-sectional view showing a fifth embodiment of the optical information recording medium of the present invention.

[ description of symbols ]

1.1 a, 1b, 1c, 1d optical information recording medium

2 first light-transmitting substrate

3 recording layer

4 semi-permeable reflecting layer

5 heating layer

6 reflective layer

7 deformation layer

8 protective layer

9 second light-transmitting substrate

10 adhesive layer

11 light transmission layer

Detailed Description

The first embodiment of the optical information recording medium of the present invention will be described with reference to FIGS. 1 to 2. FIG. 1 is a schematic cross-sectional view of an optical information recording medium of the present invention. The optical information recording medium 1 has a structure in which a recording layer 3, a semi-transmissive reflective layer 4, a heat generating layer 5, a reflective layer 6, a deformable layer 7, and a protective layer 8 are formed in this order on a first translucent substrate 2. The deformation layer 7 may also serve as the protective layer 8, and whether or not the protective layer 8 is formed is arbitrary. The dotted line a indicates laser light for recording or for playback, and the dotted line B indicates laser light for drawing.

The first translucent substrate 2 is made of a transparent resin such as polycarbonate, and is formed on a substrate having a specific shape (annular shape in the case of an optical disc) by a method such as injection molding. The recording layer 3 is a layer containing an organic dye, and pits are formed by irradiating laser light of a specific wavelength, thereby recording data. As the dye, azo dyes, cyanine dyes, or the like are preferred. The transflective layer 4 reflects the laser beam a for reproduction and passes the laser beam for drawing. As a material, a dielectric multilayer film formed by laminating a metal (Ag, Ag alloy, Al) or an oxide film having a different refractive index can be used. The heat generating layer 5 is a layer containing an organic pigment, and generates heat by irradiation with a laser beam of a specific wavelength or generates heat and changes in volume, as in the case of the recording layer 3. As the dye, azo-based dyes, cyanine-based dyes, or the like are preferable, but it is preferable to use a dye having a light absorption characteristic different from that of the recording layer 3.

The reflective layer 6 is a reflective layer formed of metal. The reflective layer 6 is melted and deformed by heat generated from the heat generating layer 5, or deformed according to a change in volume of the heat generating layer, and the deformed portion diffusely reflects visible light or transmits visible light, thereby displaying a drawn image. The metal used may be Ag, Ag alloy, Al alloy, In having a low melting point, or the like. The deformation layer 7 is formed of a transparent material that is easily thermally deformed or pressure-deformed or a layer having a space at the boundary with the reflection layer 6 so as not to hinder the deformation of the reflection layer 6. Examples of the material that is easily deformed by heat or pressure include a chain polymer, a thermoplastic resin, and a gel-like polymer resin. In particular, the chain type polymer includes acrylic, polystyrene, vinyltoluene, rosin ester and the like. The protective layer 8 is formed of a transparent resin such as an acrylic UV (UltraViolet) curable resin or a solvent-soluble polymer resin.

A method of drawing on the optical information recording medium 1 configured as described above will be described with reference to fig. 2. The laser light B for drawing is irradiated from the same direction as the laser light a for recording. The laser light B passes through the semi-transmitting reflection layer 4 and is absorbed by the heating layer 5, and the pigment of the heating layer 5 is decomposed to generate heat or generate volume change while generating heat. Then, the deformed portion C is generated in the reflective layer 6 due to the melting deformation or the volume change caused by the gas that decomposes the dye of the heat generating layer 5. Since the deformed portion C diffusely reflects or transmits visible light, a portion having a reflection amount different from that of the other portion of the reflective layer 6 is generated. An image can be observed due to the difference in the reflection amount.

Further, since the recording layer 3 is formed in a region different from the heat generating layer 5, the recording layer 3 and the heat generating layer 5 do not interfere with each other. Further, since the focal length of the laser light a irradiated onto the recording layer 3 is different from the focal length of the laser light B irradiated onto the heat generating layer 5, the recording layer 3 and the heat generating layer 5 can be made not to interfere with each other by controlling the focal points even if the laser lights having the same wavelength are used. In order to prevent this, the recording layer 3 and the heat generating layer 5 may have different light absorption characteristics (absorbances). In this case, the difference in the peak absorbance is 75nm, preferably 100nm or more, more preferably 125 nm. For example, when the optical information recording medium is a DVD, the wavelength of the laser beam used for recording is generally about 660nm, and therefore, a laser beam used for drawing having a wavelength of 785nm can be used.

Next, a second embodiment of the optical information recording medium of the present invention will be described with reference to fig. 3 to 4. In the optical information recording medium 1 shown in fig. 3, the second light transmissive substrate 9 is bonded to the protective layer with the adhesive layer 10 interposed therebetween. The DVD + -R or HD-DVD etc. has the constitution described in order to be adapted to the thickness of the CD-R etc. The drawing method and the like are the same as those of the first embodiment. The adhesive layer 10 may be an epoxy adhesive or the like.

In the optical information recording medium 1 shown in FIG. 4, the distortion layer 7 can also function as an adhesive layer. In this case, as the binder, a binder which does not inhibit the deformation of the reflective layer 6 is preferable, and examples thereof include a chain polymer.

In the optical information recording medium of DVD + -R having the above-described structure, the position information detecting means such as LPP (not shown) is provided for DVD-R, and the position information detecting means such as ADIP (not shown) is provided for DVD + R. When drawing is performed with laser light, the optical disc rotates, and therefore, laser light is irradiated based on the position information. Therefore, although it is necessary to have the position information detecting means, in the present invention, since the laser light for drawing can be irradiated from the same direction as the laser light for recording data, the conventional position information detecting means such as LPP or ADIP can be used.

Next, a third embodiment of the optical information recording medium of the present invention will be described with reference to FIG. 5. In the optical information recording medium 1 shown in fig. 3, a recording layer 3, a semi-transmissive reflective layer 4, an adhesive layer 10, a heat generating layer 5, a reflective layer 6, a deformable layer 7, and a second transparent substrate 9 are formed in this order on a first transparent substrate 2. The optical information recording medium 1 has an adhesive layer 10 formed between a data recording region and a drawing region.

In the configuration, since the adhesive layer 10 is present between the recording layer 3 and the heat generating layer 5, an effect that the drawing is performed in a state where the data recording area is not disturbed can be further enhanced. Further, since the recording layer 3 and the transflective layer 4 are distant from the heat generating layer 5, the influence of the heat or volume change generated by the heat generating layer 5 on the recording layer 3 and the transflective layer 4 can be reduced.

The optical information recording medium 1 can be obtained as follows. First, the recording layer 3 and the transflective layer 4 are sequentially formed on the first translucent substrate 2. Next, the distortion layer 7, the reflection layer 6, and the heat generation layer 5 are formed in this order on the second translucent substrate 9. Next, the surface of the first transparent substrate 2 on which the recording layer 3 and the transflective layer 4 are formed and the surface of the second transparent substrate 9 on which the distortion layer 7, the reflective layer 6, and the heat generating layer 5 are formed are bonded to each other with the adhesive layer 10 interposed therebetween. The optical information recording medium 1 obtained in this manner has the structure shown in fig. 5.

Next, a fourth embodiment of the optical information recording medium of the present invention will be described with reference to FIG. 6. In the optical information recording medium 1 shown in fig. 6, the recording layer 3 and the transflective layer 4 are formed on the first translucent substrate 2, and the second translucent substrate 9, the heat generating layer 5, the reflective layer 6, the deformable layer 7, and the protective layer 8 are sequentially formed on the transflective layer 4 with the adhesive layer 10 interposed therebetween.

In the above configuration, since the second translucent substrate 9 is present between the recording layer 3 and the heat generating layer 5, an effect that the drawing is performed without disturbing the data recording area can be further enhanced. Further, in the configuration, the focal length of the laser light irradiated onto the recording layer 3 is greatly different from the focal length of the laser light irradiated onto the heat generating layer 5. Therefore, for example, laser light for recording a CD-R can be used as laser light irradiated onto the heat generating layer 5, so that a light source different from the laser light irradiated onto the recording layer 3 can be utilized.

In so-called multi-drive, which is a recording apparatus capable of recording DVDs ± R and CD-rs, there is multi-drive including a laser light source for DVDs ± R and a laser light source for CD-rs. When the multiple driving is used, the heat generating layer 5 can be drawn while recording data on the recording layer 3 by using two kinds of light sources. The operation may be implemented by software controlling the recording apparatus.

The second translucent substrate may have a spiral groove on the side thereof on which the heat generating layer and the reflecting layer are formed, the spiral groove recording position information in the rotational direction. Thereby, position information for drawing can be provided, and more detailed position information than a method of obtaining position information using LPP or ADIP can be provided, and thus a finer image can be drawn. Further, the position information recorded in the spiral groove can be read by irradiating light from the light incident surface side.

Next, a fifth embodiment of the optical information recording medium of the present invention will be described with reference to fig. 7. The optical information recording medium shown in FIG. 7 is a so-called Blu-ray disc, and has a structure in which a semi-transmissive/reflective layer 4 and a recording layer 3 are formed in this order on a light incident side surface of a first transparent substrate 2 having a thickness of 1.1mm, and a transparent layer 11 made of polycarbonate having a thickness of 0.1mm is formed on the recording layer 3. Further, a heat generating layer 5, a reflecting layer 6, a deforming layer 7, and a protective layer 8 are formed in this order from the light incidence direction on the surface of the first translucent substrate 2 opposite to the side on which the recording layer 3 and the transflective layer 4 are formed.

In the configuration, since the recording layer 3 is separated from the heat generating layer 5, drawing can be performed in a state where the data recording area is not disturbed. Further, in the configuration, the focal length of the laser light irradiated onto the recording layer 3 is greatly different from the focal length of the laser light irradiated onto the heat generating layer 5, and therefore, for example, the laser light for recording a CD-R can be used as the laser light irradiated onto the heat generating layer 5, so that a light source different from the laser light irradiated onto the recording layer 3 can be used, and thus, drawing can be performed while recording data. Further, a groove for providing position information for recording data may be formed on the surface of the first translucent substrate on the light incident side, or a groove for providing position information for drawing may be formed on the surface opposite to the light incident side.

The embodiments of the present invention have been described above, and the shape and the like of the optical information recording medium are not limited as long as they are within the scope of the present invention, and an appropriate shape and the like can be used.

Claims (10)

1. An optical information recording medium, comprising: a recording layer and a semi-transmitting/reflecting layer are formed in this order on the surface opposite to the light incident side of the first translucent substrate, and a heat generating layer, a reflecting layer, and a deforming layer are formed in this order from the light incident direction on the side where the recording layer and the semi-transmitting/reflecting layer are formed.

2. The optical information recording medium according to claim 1, wherein: a second transparent substrate is bonded to the first transparent substrate on the side where the recording layer and the transflective layer are formed, with an adhesive layer interposed therebetween.

3. The optical information recording medium according to claim 2, wherein: a heat generating layer, a reflective layer, and a deformable layer are formed in this order on the side of the first translucent substrate on which the recording layer and the transflective layer are formed, and the second translucent substrate is bonded to the first translucent substrate with an adhesive layer interposed therebetween.

4. The optical information recording medium according to claim 2, wherein: the recording medium of the present invention is characterized in that a deformation layer, a reflection layer, and a heat generation layer are formed in this order on one surface of the second translucent substrate, and the recording medium is attached to the first translucent substrate through an adhesive layer on the side where the recording layer and the semi-transmissive reflection layer are formed, and the deformation layer, the reflection layer, and the heat generation layer are formed on the second translucent substrate.

5. The optical information recording medium according to claim 2, wherein: a second translucent substrate is bonded to the first translucent substrate on the side where the recording layer and the transflective layer are formed, with an adhesive layer interposed therebetween, and a heat generating layer, a reflective layer, and a deformable layer are formed in this order on the surface opposite to the surface of the second translucent substrate to which the recording layer and the transflective layer are bonded.

6. The optical information recording medium according to claim 4 or 5, wherein: the second translucent substrate has a spiral groove in which positional information in a rotational direction is recorded on a side on which the heat generating layer and the reflecting layer are formed.

7. An optical information recording medium, comprising: a semi-transmitting reflection layer, a recording layer, and a light transmission layer are formed in this order on the light incident surface side of a first translucent substrate, and a heat generation layer, a reflection layer, and a deformation layer are formed in this order from the light incident direction on the surface of the first translucent substrate on the side opposite to the recording layer and the semi-transmitting reflection layer.

8. The optical information recording medium according to claim 1 or 7, wherein: the heat generating layer has a light absorption characteristic different from that of the recording layer.

9. A display method for an optical information recording medium, comprising: the method is a method for displaying on an optical information recording medium, wherein a recording layer and a semi-transmissive/reflective layer are formed on one surface of a first translucent substrate, a heat generating layer, a reflective layer, and a deformable layer are further formed in this order from a light incident direction, and the heat generating layer is irradiated with a laser light from the same side as the side to which the laser light is irradiated when recording information, thereby displaying on the optical information recording medium.

10. The method for displaying an optical information recording medium according to claim 9, wherein: the recording layer is irradiated with laser light, and the heat generating layer is irradiated with laser light.