JP2001291276A - Large capacity data recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording medium in which the recording capacity is significantly increased by using the physical properties of light, properties of a liquid crystal or the like. SOLUTION: The medium has a disk substrate and a plurality of sheets of films laminated on the substrate. Each film has two kinds of information recorded, and data are recorded by combining the information recorded in each film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a data recording medium for a computer, media such as audio and video. More specifically, the present invention relates to a large-capacity data recording medium for media such as computers and audio and video.

[0002]

SUMMARY OF THE INVENTION Computers, voices,
There are various types of data recording media for media such as video. Among them, MO discs, CD-ROM discs, CD-R discs, and CD-RWs are large-capacity recording media of 100 MB or more. Discs and PD discs are known. Recently, such disk-shaped recording media having a recording capacity of 1 GB or more are commercially available, but the recording capacity of most recording media is as follows.
Only a few hundred MB.

[0003] An object of the present invention is to provide a data recording medium whose recording capacity is dramatically increased by utilizing the physical properties of light, the properties of liquid crystal, and the like.

[0004]

According to a first aspect of the present invention, there is provided a large-capacity data recording medium comprising: a disk-shaped substrate; and a plurality of films attached to the substrate. It is characterized in that various types of information are recorded, and data is recorded by combining information recorded on each film.

[0005] A large-capacity data recording medium according to claim 2 of the present application is the recording medium according to claim 1, wherein the information is:
It is characterized by one or more of the presence or absence of a hole, a difference in color, a difference in thickness, a presence or absence of optical rotation, or a difference.

A large-capacity data recording medium according to a third aspect of the present invention includes a disk-shaped substrate and a plurality of films having different properties, and only one film is exposed at an arbitrary position on a track of the substrate. Each film having a hole formed in another film is fitted to each other to form one film.
It is characterized in that the two films are affixed on a substrate in two films.

According to a fourth aspect of the present invention, there is provided the large-capacity data recording medium according to the third aspect, wherein the property of the film is at least one of color, thickness, and optical rotation. It is a feature.

A large-capacity data recording medium according to a fifth aspect of the present invention includes a disk-shaped substrate, and a laser beam is formed on a track of the substrate so that a predetermined shape corresponding to data to be recorded is formed. Data is recorded by irradiation.

According to a sixth aspect of the present invention, there is provided the large-capacity data recording medium according to the fifth aspect, wherein the predetermined shape is formed by irradiating a laser beam through a movable perforated cover. It is a feature.

A large-capacity data recording medium according to the present invention comprises a disk-shaped substrate and two or more recording layers disposed on the substrate, and a liquid crystal film is disposed between the recording layers. In this method, a recording layer on which data is to be recorded is selected based on a change in the transparency of the liquid crystal film.

According to an eighth aspect of the present invention, there is provided a large-capacity data recording medium according to any one of the first to sixth aspects, further comprising two or more recording layers disposed on a substrate. Between them, a liquid crystal film is disposed, and a recording layer in which data is to be recorded is selected based on a change in the transparency of the liquid crystal film.

A large-capacity data recording medium according to claim 9 comprises a disk-shaped substrate and two or more recording layers disposed on the substrate, and the recording layer disposed closest to the substrate side. Liquid crystal components are mixed in the other recording layers,
The recording layer on which data is to be recorded is selected based on a change in the transparency of the recording layer into which the liquid crystal component is mixed.

According to a tenth aspect of the present invention, there is provided a large-capacity data recording medium according to any one of the first to sixth aspects, further comprising two or more recording layers disposed on a substrate, and provided on a substrate side. A liquid crystal component is mixed in a recording layer other than the recording layer disposed closest to the recording layer, and a change in the transparency of the recording layer mixed with the liquid crystal component selects a recording layer on which data is to be recorded. It is characterized by the following.

[0014]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic partial sectional view showing a data recording medium according to the first embodiment of the present invention. In the data recording medium of FIG. 1, a green film is pasted on a disk-shaped substrate, a blue film is pasted on a green film, and a red film is pasted on a blue film. Then, the red film is made to correspond to the recording data "0", the blue film is made to correspond to the recording data "1", and the green film is made to correspond to the recording data "2".

On the other hand, in the green film, the blue film, and the red film, holes are formed in the other two films so that only one film is exposed at an arbitrary position on the track of the substrate (FIG. In FIG. 1, the portions without hatching are the portions with holes.) In other words, in the data recording medium of FIG. 1, only one of the green film, the blue film, and the red film exists on the track on the track. Note that making a hole in an arbitrary portion of the film means recording two types of information (ie, a portion having a hole and a portion having no hole).

When reading data recorded on the data recording medium of FIG. 1, light is irradiated onto a track of the data recording medium, and the wavelength of the reflected light is detected (that is, the wavelength of the reflected light is detected).
The recorded data can be reproduced by determining the color of the film at the light irradiation location).

FIG. 2 is a schematic partial sectional view showing a modification of the data recording medium of FIG. In the data recording medium of FIG. 2, three films each having a hole in the other two films so that only one film is exposed at an arbitrary position on the track are fitted together to form one film. It is substantially the same as the data recording medium of FIG.

In the data recording medium shown in FIGS. 1 and 2, a three-color film is stuck on a flat substrate, but a normal CD-RO having a protrusion on the flat substrate is provided.
A three-color film may be stuck on the M disk (the protrusion is called a pit and the flat part is called a land). In this manner, two types of information can be obtained for each of the three color films, and two types of information can be obtained depending on the presence or absence of pits on the substrate. By combining these information, the data recording capacity is greatly increased. I do.

In the embodiment shown in FIGS. 1 and 2, a film of two colors may be used, or a film of four or more colors may be used. The more colors the film uses, the greater the data storage capacity.
Also, in the embodiment of FIG. 1, holes are formed in the other two films so that only one film is exposed at an arbitrary position on the track of the substrate. Pierce only one film,
The other two films may be left as they are. As the two types of information recorded on each film, not only the presence or absence of a hole but also other properties that can be detected by light, such as a difference in color and a difference in thickness, can be used.

FIG. 3 is a schematic partial sectional view showing a data recording medium according to a second embodiment of the present invention. In the data recording medium of FIG. 3, a first optically rotating film is attached on a disk-shaped substrate, and a second optically rotating film is attached on the first optically rotating film.

The first optically rotating film and the second optically rotating film include a portion on the track where both the optically rotating films are not present and a portion where the second optically rotating film is not present (that is, the first optically rotating film). Holes are formed so that a portion where only the optical rotatory film is present) and a portion where both optical rotatory films are present are formed (in FIG. 3, holes where hatching is not applied are holes). Where it is). It is to be noted that, as in the first embodiment, the formation of a hole in an arbitrary portion of the film requires two types of information (that is, a portion having a hole and a portion having no hole).
Means to record.

Then, the location where both optical rotation films do not exist is made to correspond to the recording data "0", and the location where the second optical rotation film does not exist (that is, the location where only the first optical rotation film exists) is determined. The location where both optically rotating films are present is made to correspond to the recording data “2”, respectively, corresponding to the recording data “1”.

When reading data recorded on the data recording medium of FIG. 3, the recording data is read by irradiating a laser beam onto a track of the data recording medium through a polarizing filter and detecting the polarization angle of the reflected light. Can be played.

In the data recording medium shown in FIG.
As in the case of the data recording medium of FIGS. 1 and 2, an optical rotatory film may be stuck on a normal CD-ROM disc provided with a protrusion. In this manner, two types of information can be obtained for each optical rotation film, and two types of information can be obtained depending on the presence or absence of pits on the substrate. By combining these information, the data recording capacity is greatly increased. I do.

In the above embodiment, two optically rotating films are used, but three or more optically rotating films can be used to increase the data recording capacity.

In the above embodiment, the presence or absence of a hole is used as the information recorded on each film. However, the strength of the optical rotation may be used, and a film having no optical rotation and a film having an optical rotation may be used. May be used in combination. Alternatively, films having different thicknesses may be used.

FIG. 4 is a diagram relating to a data recording medium according to a third embodiment of the present invention. The data recording medium according to the third embodiment is obtained by irradiating a laser beam on a track of a substrate through a perforated cover to print a predetermined shape corresponding to data to be recorded on the substrate. It is formed.

As shown in FIG. 4B, the perforated cover is provided with a slit so that it can rotate. Then, the position where the slit is 0 ° is the recording data “0”.
, The 30 ° position corresponds to the recording data “1”,
The 60 ° position corresponds to the recording data “2”, the 90 ° position corresponds to the recording data “3”, the 120 ° position corresponds to the recording data “4”, and the 150 ° position corresponds to the recording data “4”. 5 "respectively.

The holes of the perforated cover may be holes of other shapes instead of slits. In the above example, 3
Although the recording data is made to correspond every 0 °, for example, 10 °
Alternatively, the recording data may correspond to each other angle.
An ordinary motor may be used to rotate the perforated cover.

In the above embodiment, the perforated cover is rotated to bake a predetermined shape on the substrate, but the perforated cover is moved in another form (for example, reciprocating or swinging). ), The predetermined shape may be printed on the substrate.

FIG. 5 is a schematic partial sectional view showing a data recording medium according to a fourth embodiment of the present invention. In the data recording medium of FIG. 5, a reflective film is disposed on a disk-shaped protective film, a first recording layer is disposed on the reflective film, a control layer is disposed on the first recording layer, Second on control layer
Is disposed, and the recording layer is covered with a transparent substrate. The control layer has a liquid crystal film and transparent electrodes disposed on the upper and lower surfaces of the liquid crystal film.

The liquid crystal film of the control layer becomes transparent when a voltage is applied, and becomes opaque when no voltage is applied.

When writing data to the data recording medium of FIG. 5, a voltage is applied to the liquid crystal film to make it transparent, and
Write data to the recording layer. Next, the liquid crystal film is made opaque without applying a voltage, and data is written to the second recording layer.

In the data recording medium shown in FIG. 5, two recording layers are provided. However, three or more recording layers are provided, and a control layer is provided between the layers to further increase the data recording capacity. Can be increased.

As a modification of the data recording medium shown in FIG. 5, a liquid crystal component may be mixed in the second recording layer so that the second recording layer itself plays the role of a control layer. In this modification in which three or more recording layers are provided, a liquid crystal component is mixed in all the recording layers except the first recording layer.

In the above-described embodiment, the application of a voltage is used to control the transparency of the liquid crystal film or the recording layer in which the liquid crystal component is mixed. The transparency of the liquid crystal film or the recording layer in which the liquid crystal component is mixed can be controlled by using other means. In addition,
In such a case, the transparent electrode can be omitted.

A new data recording medium may be made by combining the data recording medium according to the first to third embodiments and the data recording medium according to the fourth embodiment.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims. It goes without saying that it is included in.

[0039]

According to the data recording medium of the present invention, the data recording capacity can be dramatically increased with a relatively simple structure.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional view showing a data recording medium according to a first embodiment of the present invention.

FIG. 2 is a schematic partial sectional view showing a modification of the data recording medium of FIG.

FIG. 3 is a schematic partial sectional view showing a data recording medium according to a second embodiment of the present invention.

4A and 4B are diagrams illustrating a data recording medium according to a third embodiment of the present invention, wherein FIG. 4A is a schematic diagram illustrating a recording principle, FIG. 4B is a plan view of a perforated cover, (c) is a plan view of a pit on which data is recorded.

FIG. 5 is a schematic partial sectional view showing a data recording medium according to a fourth embodiment of the present invention.

Claims (10)

[Claims] 1. A disc-shaped substrate, and a plurality of films attached to the substrate, each film recording two types of information, and combining the information recorded on each film. A large-capacity data recording medium on which data is recorded. 2. The large-capacity data recording according to claim 1, wherein the information is at least one of the presence or absence of a hole, a difference in color, a difference in thickness, a presence or absence of optical rotation, or a difference. Medium. 3. A disk-shaped substrate and a plurality of films having different properties each having a hole formed in another film so that only one film is exposed at an arbitrary position on a track of the substrate. A large-capacity data recording medium, wherein the films are fitted together to form one film and adhered on a substrate. 4. The film according to claim 1, wherein the properties of the film are color, thickness,
4. The large-capacity data recording medium according to claim 3, wherein the medium has at least one optical rotation. 5. A disk-shaped substrate, wherein data is recorded by irradiating a laser beam onto a track of the substrate so as to form a predetermined shape corresponding to the data to be recorded. Large-capacity data recording medium. 6. The large-capacity data recording medium according to claim 5, wherein the predetermined shape is formed by irradiating a laser beam through a movable perforated cover. 7. A liquid crystal display device comprising: a disk-shaped substrate; and two or more recording layers disposed on the substrate, wherein a liquid crystal film is disposed between the recording layers. A large-capacity data recording medium wherein a recording layer on which data is to be recorded is selected. 8. A recording device comprising two or more recording layers disposed on a substrate, wherein a liquid crystal film is disposed between the recording layers, and the recording is intended to record data by changing the transparency of the liquid crystal film. 7. The large-capacity data recording medium according to claim 1, wherein a layer is selected. 9. A disk-shaped substrate, and two or more recording layers disposed on the substrate, wherein a liquid crystal component is mixed into recording layers other than the recording layer disposed closest to the substrate side. A large-capacity data recording medium wherein a recording layer on which data is to be recorded is selected based on a change in transparency of the recording layer into which a liquid crystal component is mixed. 10. A liquid crystal display device comprising two or more recording layers disposed on a substrate, wherein a liquid crystal component is mixed in a recording layer other than the recording layer disposed closest to the substrate side. 2. The recording layer on which data is to be recorded is selected according to a change in transparency of the mixed recording layer.
7. The large-capacity data recording medium according to any one of Items 1 to 6.