JPS63195838A - Optical information recording carrier - Google Patents

Abstract

PURPOSE:To prevent generation of a reading-out error by inclination of a recording carrier, et., by forming a matte on a resin substrate contg. a fluorescent dye, providing a specific optical recording layer thereon and laminating a transparent layer further thereon to execute recording and reproduction of information from the transparent layer side. CONSTITUTION:This optical information recording carrier is constituted by forming the matte 17 on the substrate 4 consisting of the resin contg. the fluorescent dye, providing the optical recording layer 2 which is changed in the transmittance of light when projected by an energy beam thereon and laminating the transparent layer 1 via an adhesive layer 3 on the recording layer 2. An illminating luminous flux 15 is projected from the outside to the above-mentioned information recording carrier to change the light transmittance of the optical recording layers 2, 13 by which recording information 14, 15 are recorded on said layer. An illuminating luminous flux 16 is projected through the substrate 4 to said layers to impart energy to the fluorescent dye so that said dye emits light and the emitted light is converted to a light emission intensity distribution, by which the information are reproduced. The luminous flux 16 from the light introducing part of the substrate 4, therefore, propagates in a light guide 5 in common use as the light emitting layer contg. the fluorescent dye and is then emitted from the information recording surface. Said light is projected as the intensity distribution of the quantity of the exit light emitted from the information recording surface on a sensor 10, by which the information is read. The reading-out error by the inclination of the carrier, etc., is thereby prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording carrier that optically records and reproduces information, and particularly relates to an optical information recording carrier that has features in an optical system for information reproduction. be.

[Prior Art] In recent years, as society has become more information-oriented, many information recording carriers and optical information recording and reproducing devices have been used to efficiently handle a wide variety of information. Proposed. Some of the information recording carriers are capable of detecting binary information by converting it into a change in reflected light intensity accompanying a change in reflectance or a change in surface shape such as the presence or absence of pits.

The above-mentioned information recording carrier has excellent features such as high recording density, non-contact recording and reproduction, and long life. As an information recording carrier based on such a change in optical reflectance, a so-called heat mode recording material has been proposed, which records by irradiating the recording layer with an energy beam such as a laser beam in a spot shape to change the state of a part of the recording layer. has been done. These recording materials are DRAW (direct read after write), which allows information to be read directly after writing without the need for development processing.
ite)] is a medium capable of high-density recording,
It is also possible to perform additional writing.

An optical cart will be described as an example of an information recording carrier. FIG. 3 is a schematic cross-sectional view of a conventional optical card. In FIG. 3, 1 is a transparent layer, 2 is an optical recording layer, 3 is an adhesive layer, and 4 is a card-shaped substrate. The optical recording layer 2 used is one that absorbs energy when irradiated with a recording energy beam, converts it into heat, and changes its state in the irradiated area. The state change generally utilizes a change in reflectance at the irradiated part.

FIG. 4 is a schematic configuration diagram showing an optical information reproducing apparatus using the optical cart described above. In FIG. 4, the optical card 12 is movable in the direction of arrow A by the rotation mechanism 6. As shown in FIG. Information recorded on the optical card 12 is read and reproduced by the optical card 11. First, the semiconductor laser, L
Light from a light source 7 such as an ED is focused by a lens system 8, and illuminates a line on the information signal line in which information is recorded. An image of the illuminated portion is formed on a sensor 10 by an imaging optical system 9, and an electrical signal corresponding to the recorded information is output from the sensor 10.

Although this method has the advantage of manufacturing a device that reads information from the optical card 12 using easily available components, it is difficult to reduce the thickness of the optical head 11, and the optical Since the reflected light from the card 12 is used for reading information, there is also a drawback that if the optical card 12 has a tilt error, the change in the amount of read light increases.

[Problems to be Solved by the Invention] In view of the above-mentioned problems of the conventional optical cards, an object of the present invention is to provide an optical card in which tilt errors of the optical card are less likely to occur.

[Means for Solving the Problems] That is, the present invention provides an information recording carrier for optically recording and reproducing information: A mat is formed on a substrate made of a resin containing a fluorescent dye, and a mat is formed on the mat. has an optical recording layer whose light transmittance changes when irradiated with an energy beam,
A transparent layer is laminated on the optical recording layer via an adhesive layer,
Recorded information is recorded by irradiating an illumination beam from the outside to change the light transmittance of the optical recording layer, and by irradiating the illumination beam through the substrate, energy is imparted to the fluorescent dye to cause it to emit light, thereby creating a luminescence intensity distribution. This is an optical information recording carrier that is characterized in that it converts and reproduces data.

Furthermore, specifically, as an information recording carrier that optically records and reproduces information, the substrate includes a light introducing section that introduces an illumination beam from the outside into the information recording carrier, and a medium that can be recorded in a heat mode. and an optical waveguide for guiding light to the optical recording layer, in which the light introduction part and the optical waveguide are made of a resin containing a fluorescent dye, and the resin After the surface is matted, an optical recording layer made of a medium that can be recorded in a heat mode is formed on the matted surface. This can be achieved by configuring an optical waveguide that also serves as a light emitting layer.

The present invention will be explained in detail below.

FIG. 1 is a sectional view showing an embodiment of an optical information recording carrier according to the present invention. In FIG. 1, in the optical information recording carrier of the present invention, a mat 17 is formed on a substrate 4 made of a resin containing a fluorescent dye, and the light transmittance is changed by irradiating the mat 17 with an energy beam. A variable optical recording layer 2 is provided, and a transparent layer 1 is placed on the optical recording layer 2 via an adhesive layer 3.
It is made by laminating layers. Note that the substrate 4 is an optical waveguide for the illumination light flux, and also serves as a light emitting layer.

In the present invention, as the transparent layer 1, it is possible to use a light-transmitting material such as glass or a plastic film, and a plastic film is preferable from the viewpoint of productivity and smoothness. Examples include cellulose derivatives, polyester resins, polycarbonate resins, vinyl resins, acrylic resins, polysulfone resins, polyimide resins, polyether resins, and polyamide resins.

The optical recording layer 2 may be any material as long as it is capable of recording in a heat mode and changes its light transmittance by recording by irradiation with an energy beam. Organic thin films such as dyes can be manufactured continuously by solution coating, and are preferred because their light transmittance often changes when irradiated with an energy beam. For example, anthraquinone derivatives, especially those having an indathrene skeleton, dioxazine compounds and their derivatives, triphuedithiazine compounds, phenanthrene derivatives, cyanine compounds, merocyanine compounds, pyrylium compounds, xanthine compounds, triphenylmethane compounds, croconium Examples include dyes such as dyes based on pigments, azo dyes, crocones, azines, indigoids, methine dyes, azulenes, squalium derivatives, sulfur dyes, and metal dithiolate complexes. The thickness of the optical recording layer is usually 0.05 to 0.2 ILm, preferably 0.08 to 0.15 μm.

As the adhesive layer 3, known thermoplastic adhesives are convenient in that they do not damage organic thin films such as dyes, and examples include ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, vinyl acetate-acrylate. Copolymers and modified resins thereof are preferred.

Next, the substrate 4 as the optical waveguide 5 is preferably a resin substrate containing a fluorescent dye, such as thionine, safranin T,
Preferably, a fluorescent dye such as acridine yellow, acridine orange, phenosafranine, or rhodamine B is mixed with a transparent resin such as a polycarbonate resin, an acrylic resin, or a cellulose derivative. For example, the product name rLI, which is commercially available as a light-harvesting plastic,
SAJ (manufactured by Bayer) can be used in the present invention, and there are some that emit various fluorescent colors.

The optical information recording carrier according to the present invention can be produced as follows. A resin substrate 4 containing a fluorescent dye, that is, an optical waveguide 5 (also serving as a light emitting layer)
Optical recording is performed by applying a medium on which the optical recording layer 2 will be formed by forming fine irregularities on the surface thereof, making it matte, and coating it with a medium that allows recording in the heat mode described above and whose light transmittance changes depending on recording. form a layer. The fine unevenness may be made into a mat by appropriately plastering, and the roughness of the unevenness may be appropriately selected depending on the size of the recording bit. Furthermore, the light emitting efficiency of the optical waveguide 5, which also serves as a light emitting layer, can be increased by coating the surface of the optical waveguide 5 other than the optical recording layer 2 with a highly reflective thin film. The optical information recording carrier of the present invention can be easily manufactured by bonding the optical waveguide 5 on which the optical recording layer 2 is formed and the transparent layer 1 via the adhesive layer 3.

Furthermore, a protective layer may be formed on the surface of the transparent layer 1 or the optical waveguide 5 to prevent scratches. For example, an acrylic ultraviolet curing hard coat or a silicone thermosetting hard coat is preferable for this purpose.

Next, FIG. 2 is an explanatory diagram showing a recording/reproducing method for an optical information recording carrier according to the present invention. In FIG. 2, reference numbers 7 to 10 are the same as in FIG. 4. 13 is an information recording layer, 14 is a recorded portion, 15 is an unrecorded portion, and 16 is an illumination light beam from an external light source.

As an external light source, fluorescent lamps, cold cathode tubes, tungmetine lamps, halogen lamps, mercury lamps, light emitting diodes, semiconductor lasers, etc. can be used. (back side of optical card)
From there, the illumination light beam 16 is introduced into the optical waveguide 5. Alternatively, it is also possible to introduce light from a surface of the transparent layer 1 other than the surface on which the information recording layer 13 is provided (16' in the figure).

However, this is limited to the case where a reflective layer or the like is not provided on the surface of the optical waveguide 5 that is bonded to the transparent layer l.

The introduced illumination light flux imparts optical energy to the fluorescent dye contained in the optical waveguide 5, which also serves as a light emitting layer, to emit light, and the emitted light is emitted as diffused light from the information recording layer 13, which is provided with a matte surface having fine irregularities. In this case, since there is a difference in light transmittance between the recorded portion 14 and the unrecorded portion 15, the intensity distribution of the amount of emitted light is obtained. Information is reproduced by reading out the intensity distribution using the sensor 10 via the imaging optical system 9.

Furthermore, regarding reproduction, the method is not limited to the method of using an imaging optical system as shown in FIG. 2 shown in the embodiment of the present invention. It is also possible to reproduce recorded information with the sensor array close to or in close contact with the optical information recording carrier, and in this case, the configuration of the optical head can be simplified.

Information is recorded by irradiating the optical recording layer 2 with an energy beam from, for example, a semiconductor laser of a light source 7 through a lens system 8.
), heat is generated, and the medium in the optical recording layer reacts in a heat mode to change the transmittance.

In this embodiment, since illumination is performed from the back side of the information recording layer using diffused light, there is an advantage that the influence of the tilt of the cart on information reading is small. Furthermore, since the optical axis of the imaging optical system is set perpendicular to the optical card, lenses with a small working distance can also be used, allowing for compact design.

When using a two-dimensional sensor array as the sensor 10, in order to avoid changes in magnification depending on the position on the sensor,
It is necessary that the optical axis of the imaging optical system be set perpendicular to the optical card.

The optical information recording carrier of the present invention is applicable not only to optical carts but also to optical information recording carriers such as optical discs. In the case of an optical disk, unlike an optical card, the substrate 4 and the transparent layer 1 are not bonded together via the adhesive layer 3 as shown in the above embodiment, but, for example, the transparent layer 1 and the optical recording layer 2 are bonded together.
A hollow structure may be formed between the adhesive layer 3 (the adhesive layer 3 in FIG. 1).

[Function] The optical information recording carrier of the present invention is an information recording carrier for optically recording and reproducing information, in which a mat is formed on a substrate made of a resin containing a fluorescent dye, and energy is applied onto the mat. An optical recording layer whose light transmittance changes when irradiated with a beam is provided, a transparent layer is laminated on the optical recording layer via an adhesive layer, and an illumination beam is irradiated from the outside to change the light of the optical recording layer. The recorded information recorded by changing the transmittance is reproduced by irradiating the illumination beam through the substrate, giving energy to the fluorescent dye and causing it to emit light, converting it into a luminescent layer distribution, and reproducing it. The illumination light flux introduced from the light beam propagates through an optical waveguide that also serves as a light emitting layer containing a fluorescent dye, and then exits from the information recording surface and enters the optical sensor as an intensity distribution of the amount of emitted light, allowing information to be read. It will be done.

[Examples] Examples of the present invention will be described below, but the present invention is not limited thereto.

Example 1 The surface of an L ISA film (Great KL 1-9400. Red 61R, manufactured by Bayer Corp.) made of polycarbonate resin with a thickness of 0.4 mm and vacuum-deposited aluminum on one side was coated with no aluminum. A diacetone alcohol solution (concentration 3% by weight) of an organic dye represented by formula (1) is coated onto the matte surface using a barcode method, and an optical recording layer made of the organic dye with a thickness of 1,500 mm is produced. formed a layer. A part of the optical recording layer was wiped off with a diacetoxyalcohol solution to form a window for light guide.

Formula (I) A transparent polycarbonate film (Panlite, manufactured by Kijin Kasei Co., Ltd.) with a thickness of 0.3 m + a is exposed to light via a thermoplastic adhesive (ethylene-vinyl acetate system, Evaflex, manufactured by DuPont Mitsui Polychemical Co., Ltd.). LISA that formed the recording layer
It was overlapped with a film and bonded together by pressing with a hot roll having a surface temperature of 120°C.

After that, the surface of the transparent substrate was coated with an epoxy acrylate hard coating agent (Azoca Ultraset, manufactured by Asahi Denka Kogyo Co., Ltd.).
was applied and cured with ultraviolet light to create an optical card.

This optical card has a wavelength of 830 nm and a laser power of 3.
9 mW, beam diameter 4.5 gmφ, laser pulse width 1
Recording was carried out by driving the card at a speed of 20 p, s and a card feed speed of 60+*+s/s to obtain a bit string with a recording pit diameter of 4 pmφ.

After irradiating the light guide window with light from the cold cathode tube from the outside,
When the card was driven at a card feed speed of 60+s+s/s and the light flux emitted from the bit string was detected by an image sensor via an imaging optical system, the emission contrast ratio was 0.45, and a good ON-θFF signal was obtained. .

[Effects of the Invention] As explained above, by adopting the configuration of the present invention, (1) the reflected light of the optical information recording carrier does not directly become the information reading light; It is possible to create a configuration in which read errors are less likely to occur even with system deviations.

(2) Since the light introducing portion of the substrate and the optical waveguide are made of a resin containing fluorescent dye and also serve as a light emitting layer, the amount of output light for information reading can be increased.

■The information recording surface is made of a medium that can be recorded in heat mode, and the light transmittance changes depending on the recording in heat mode.It is easy to manufacture and inexpensive because it can be easily formed by coating etc. be.

(2) According to the configuration of the present invention, the entire information reading system can be easily made thin and compact.

It can have the following advantages.

Furthermore, according to the present invention, it is possible to construct an ultra-thin optical information recording/reproducing device.

Furthermore, since reading is performed in a direction perpendicular to the optical information recording carrier, it is possible to construct a reproducing optical system that causes fewer reading errors due to the inclination of the recording carrier. In particular, since the optical waveguide also serves as a light emitting layer, it is possible to increase the amount of output light for reading out information, which is further advantageous.

Furthermore, since the optical recording layer is constituted by a medium capable of recording by heat mode used in the present invention, it can be formed into a film by a coating method, so manufacturing is easy, and recording by a semiconductor laser is possible.

[Brief explanation of the drawing]

b Fig. 1 is a sectional view showing an embodiment of the optical information recording carrier according to the present invention, Fig. 2 is an explanatory diagram showing a recording/reproducing method of the optical information recording carrier according to the present invention, and Fig. 3 is a cross-sectional view showing an embodiment of the optical information recording carrier according to the present invention. FIG. 4 is a schematic cross-sectional view of a conventional optical card and a schematic configuration diagram showing an optical information reproducing apparatus using the conventional optical card. 1...Transparent layer 2...Optical recording layer 3...
・Adhesive layer 4...Substrate 5...Optical waveguide 6...Rotation mechanism 7...Light source
8... Lens system 9... Imaging optical system
10...Sensor 11-...Hikari Rad 12
... Optical card 13 ... Information recording layer 14.
...Recording section 15...Unrecorded section 16, 16'...Illumination light flux

Claims (1)

[Claims] Optical recording is an information recording carrier that optically records and reproduces information, in which a mat is formed on a substrate made of a resin containing fluorescent dye, and the light transmittance changes by irradiating the mat with an energy beam. A layer is provided, and a transparent layer is laminated on the optical recording layer via an adhesive layer, and recorded information is recorded by irradiating an illumination beam from the outside to change the light transmittance of the optical recording layer. What is claimed is: 1. An optical information recording carrier characterized in that energy is imparted to a fluorescent dye by irradiating an illumination light beam through it to cause it to emit light, which is converted into a luminescence intensity distribution and reproduced.