JPH04113539A - Information recording medium and information recording system formed by using this medium - Google Patents

Abstract

PURPOSE:To provide a large capacity, portability and high speediness in combination by providing a layer which records the information reproduced by light and a transparent magnetic layer which is recorded and reproduced by a magnetical means on the same substrate. CONSTITUTION:A light transmittable 'Teflon(R)' underlying layer 3 and a telluri um metallic recording film (optical recording layer) 4 are successively formed on the surface, on which a magnetic layer 2 is not formed, of the polycarbonate substrate 1 which is formed with the transparent magnetic layer 2 on the flat surface (on the side not provided with grooves). The magnetic recording layer 2 can be utilized for the information requiring the high speediness in recording and reproducing and the layer 4 recorded with the information reproduced by light can be used for the information requiring the large capacity by provid ing the magnetic layer 2 without adversely affecting the recording capacity of the optical recording layer 4 in such a manner. The small-sized information recording system having portability, high speediness and large capacity is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a storage medium and a storage system used in computers and the like. In particular, the present invention relates to an information recording medium for a personal computer, an information recording/reproducing method, and a system, which require miniaturization.

[Prior Art] In recent years, with the spread of personal computers, portable floppy disks, hard disks capable of high-speed data transfer, optical disks capable of recording large amounts of data, and the like have been put into practical use as information recording devices.

Further, Japanese Utility Model Application Publication No. 61-46658 describes a "temporary recording card having a magnetic recording layer and a reversible photosensitive temporal recording layer provided on at least a portion of at least one surface."

Furthermore, Japanese Patent Application Laid-open No. 104344/1984 describes that ``a disk-shaped recording medium comprising two transparent substrates arranged in parallel, each having one or both of an optical recording medium for optical recording and a magnetic recording medium for magnetic recording. Body (however.

When the transparent substrate is provided with both, the two do not overlap when viewed from the direction of the rotation axis of the recording medium. )” is written.

[Problems to be Solved by the Invention] However, it is difficult to increase the recording capacity of floppy disks. Hard disks are not portable, and optical disks allow data to be written only once, and there is also the problem of slow data transfer speeds. Recently, rewritable optical discs (magneto-optical discs) have also been developed, but in any case, there has been a problem that their recording and reproducing speeds are slow. Currently, in order to cope with these circumstances, it is common practice for computers that require high performance to connect multiple types of information recording devices to the same computer, but this has changed in recent years. This is one of the major factors preventing computers from becoming smaller and cheaper.

Therefore, in view of the above-mentioned drawbacks of the prior art, the present invention aims to provide an information recording/reproducing system, a recording/reproducing method, and an information recording medium used therein, which have large capacity, portability, and high speed in a single information recording system. This is the purpose.

The temporary recording card described in Japanese Utility Model Application Publication No. 61-46658 has a reversible photosensitive recording layer that makes numbers, symbols, nine characters, etc. appear and disappear according to the exposure pattern, and has a magnetic recording layer. However, the drawbacks of the prior art described above cannot be overcome.

Further, in the disk-shaped recording body described in Japanese Patent Application Laid-Open No. 61-104344, an optical recording medium and a magnetic recording medium provided on one transparent substrate overlap when viewed from the rotational axis direction of the recording body. The optical recording medium has the same area as the optical recording medium, assuming access from the same direction. The disadvantage is that the recording capacity is smaller than that of . Therefore, this recording medium also does not fully eliminate the drawbacks of the prior art described above.

[Means and effects for solving the problems] According to the present invention, the above objects can be achieved by a primary information recording medium, an information recording/reproducing method and system using the same.

■ A layer that records information that is reproduced by light.

An information recording medium that has a transparent magnetic layer on the same substrate that is recorded and reproduced by magnetic means.

■ A layer that records information that is reproduced by light.

An information recording and reproducing method that uses both information that is reproduced by light and information that is recorded and reproduced using magnetic means, using an information recording medium equipped with a transparent magnetic layer that is recorded and reproduced by magnetic means.

■ A layer that records information that is reproduced by light.

Using an information recording medium equipped with a transparent magnetic layer that is recorded and reproduced by magnetic means, the information recorded in the recording layer is reproduced by the light transmitted through the transparent magnetic layer. A method for recording and reproducing information, which performs recording and reproducing on the magnetic layer via magnetic means.

■ An information recording medium comprising a layer for recording information that is reproduced by light and a transparent magnetic layer that is recorded and reproduced by magnetic means on the same substrate, and a layer for recording information that is reproduced by light. a reproduction means for reproducing recorded information;
An information recording and reproducing system comprising a recording and reproducing means for performing recording and reproducing of the magnetic layer.

As a result of intensive research to achieve the above object, the inventors of the present invention have found that by using a transparent magnetic recording layer, a magnetic disk and an optical disk can be integrated without affecting the information reproduced by light in any way. The present invention was completed by discovering that it is possible to produce an information recording medium.

This is because the magnetic layer of the information recording medium of the present invention is transparent.

A layer that records information that is reproduced by light (hereinafter referred to as "layer").

It is called an optical recording layer. ) can pass through the light that reproduces the information. Therefore, (1) the information recording medium of the present invention does not hinder the recording capacity of the optical recording layer by the magnetic layer (for example, its position, area, etc.), so (1) both are disposed over the entire effective usable surface of the disk-shaped substrate. can be set.

Preferred information recording media are as follows.

(f) Information recording comprising an optical recording layer for recording information reproduced by light applied from the other side of the substrate on one side of the transparent substrate, and the transparent magnetic layer on the other side of the substrate Medium. According to this, access can be made by optical and magnetic means from the same direction.

(Incorporated) An information recording medium comprising two of the above information recording media, the optical recording layers of each of the two information recording media being arranged to face each other. According to this, it can be accessed from two directions (both sides) by both optical and magnetic means.

Preferably, at least one of the two types of information recording media (as described above) is used in the information recording and reproducing method and system.

Note that the information recording medium of the present invention can be combined with a drive device of an information recording/reproducing apparatus to form a system.

[Preferred Embodiment] The optical recording layer is a layer for recording information that is reproduced by light, as described above.

The transparent magnetic layer is used for recording and reading by magnetic means such as a magnetic head, and is generally provided with its surface exposed. Some transparent magnetic layers are made up of fine magnetic substances dispersed in a transparent base layer. For example,
There is one described in Japanese Patent No. 8578.

The information recording medium of the present invention has an optical recording layer and a transparent magnetic layer on the same substrate. The magnetic layer can be provided with a transparent magnetic layer.

When the substrate is transparent, the information recording medium can be provided with an optical recording layer on one surface side of the substrate and a transparent magnetic layer on the other surface side. A preferable optical recording layer of this recording medium is an optical recording layer that records information that is reproduced by light applied from the surface side of a substrate provided with a transparent magnetic layer.

Since the magnetic layer and the substrate are transparent, information recorded on the optical recording layer is reproduced by light that passes through them.

Select two of the above information recording media as appropriate.

They may be bonded together so that the transparent magnetic layer is exposed to the outside.

[Example] (Example 1) As shown in FIG. A light-transparent Teflon (trade name for polyfluoroethylene) base layer 3. An information recording medium was prepared by sequentially forming tellurium-based metal recording films (optical recording layers) 4.

The access direction of the obtained information recording medium by optical access means A is indicated by arrow a, and the access direction by magnetic access means B is indicated by arrow in FIG. 1, respectively.

(Example 2) Two information recording media of Example 1 were produced in the same manner as in Example 1, and a spacer =
(not shown) to form a disk (information recording medium). This is shown in FIG. Between the two boards pasted together.

An air layer (gap) 5 is formed by the spacer. Optical access means A for this disc.

Arrows a and a' indicate the access direction by A', and arrows a and a' indicate the access direction by magnetic access means B and B'.

b' respectively shown in FIG. Note that the information in the tellurium-based metal recording film 4' and the magnetic layer 2' is accessed by accessing from the arrow a' direction and the arrow b' direction, respectively. The disc thus obtained is similar in appearance to a known write-once (one-time writeable) double-sided optical disc, except that transparent magnetic layers are formed on both sides.

Either this disk was recorded as a normal optical disk and then played back repeatedly, or the error rate was normal and it could be treated exactly like an optical disk without a transparent magnetic layer.

Next, this disk was set in the drive unit of the magnetic recording/reproducing device and rotated at 3000 revolutions per minute.

A magnetic head (track width of 50 feet) with a load of about 1 g.

5 while sliding the gap length 0.35μm).
When recording and reproducing a MHz signal, the C/N was 50d.
A value of B or higher was obtained. This shows sufficient performance as a magnetic disk.

Furthermore, I set it in the optical disc device again and tried to play back the information that had been recorded for the first time, and it was able to be played back without any problems.

In the above experiment, it is unclear whether the magnetic head was sliding in contact or slightly floating, but no scratches that appeared to be caused by sliding were observed on the disk surface.

[Effects of the Invention] The information recording medium of the present invention includes a magnetic layer without adversely affecting the recording capacity of the optical recording layer.

A magnetic recording layer can be used for information that requires high-speed recording and reproduction, and a layer that records information that is reproduced by light can be used for information that requires a large capacity. . This makes it possible to create a compact information recording system that has portability, high speed, and large capacity.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing the layer structure of the information recording medium of the present invention. FIG. 2 is a partial cross-sectional view of a double-sided type according to a second embodiment of the present invention. A'...Optical access means B'...Magnetic access means a'...Access direction by optical means b'...Access direction by magnetic means Applicant Fuji Photo Film Co., Ltd. Agent Attorney Asahi Kato Road 1...Transparent substrate (polycarbonate) 2.2'...
Transparent magnetic layer 3... Underlayer (Teflon) 4.4'... Tellurium-based metal recording film (optical recording layer) 5...
・Air layer (gap) 1 ・Transparent substrate (polycarbonate) 22' Transparent magnetic layer 3 Underlayer (Teflon) 44' Tellurium-based metal recording film 5 Air layer (gap) A A' Optical access means B B' Magnetic access means a a' access direction by optical means b'
Access direction by magnetic means (optical recording layer) 1.

Claims (9)

[Claims] (1) An information recording medium comprising a layer for recording information reproduced by light and a transparent magnetic layer for recording and reproduction by magnetic means on the same substrate. (2) A layer for recording information that is reproduced by light applied from the other side of the substrate is provided on one side of the transparent substrate, and the transparent magnetic layer is provided on the other side of the substrate. The information recording medium according to claim 1. (3) comprising two information recording media according to claim 2;
An information recording medium characterized in that layers for recording information reproduced by the light in each of the two information recording media are arranged to face each other. (4) Information that is reproduced by light using an information recording medium that includes a layer that records information that is reproduced by light and a transparent magnetic layer that is recorded and reproduced by magnetic means;
A method for recording and reproducing information characterized by using both information recorded and reproduced using magnetic means. (5) An information recording medium comprising, on one side of a transparent substrate, a layer for recording information that is reproduced by light applied from the other side of the substrate, and comprising the transparent magnetic layer on the other side of the substrate. 5. The information recording and reproducing method according to claim 4, wherein both information reproduced by light and information recorded and reproduced using magnetic means are used. (6) Using an information recording medium comprising a layer for recording information that is reproduced by light and a transparent magnetic layer that is recorded and reproduced by magnetic means, the light is transmitted through the transparent magnetic layer. 1. A method for recording and reproducing information, comprising reproducing information recorded in a layer for recording information to be reproduced by the magnetic layer, and recording and reproducing information on the magnetic layer via magnetic means. (7) The information recording and reproducing method according to claim 6, wherein the information recording medium is the information recording medium according to claim 2 or 3. (8) An information recording medium comprising a layer for recording information reproduced by light and a transparent magnetic layer for recording and reproduction by magnetic means on the same substrate, and recording in the layer for recording information reproduced by light. 1. An information recording and reproducing system comprising: a reproducing means for reproducing information recorded in the magnetic layer; and a recording and reproducing means for recording and reproducing information on the magnetic layer. (9) The information recording and reproducing system according to claim 8, wherein the information recording medium is the information recording medium according to claim 2 or 3.