JPH03183026A - Information processor and optical disk memory using the same - Google Patents

Abstract

PURPOSE:To make disks exchangeable to each other by specifying the reflectance of an optical disk exclusive for reproducing and making the reflection factor same as those of DRAW type and rewritable type optical disks. CONSTITUTION:The optical disk is composed of a transparent substrate 130, an interference film 141 made of a dielectric and a reflection film 144 made of metal, etc. Reproducing light is made incident from the substrate 130 side. By adding the film 141, the interference of light is generated and a set range can be enlarged for the reflectance of the disk. In such a case, by changing the thickness of the film 141, the reflectance of the disk can be changed. In order to construct an optical memory system equipped with exchangeability to the reflectance of the optical disk exclusive for reproducing, DRAW type and rewritable type optical disks, the reflectance of the optical disk exclusive for reproducing is set at a certain degree exceeding 50% while considering error. When considering efficiency, etc., for utilizing the thermal energy of the light, the reflection factor is more desirable at 52-60%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disk memory and an information processing device using the same. In particular, the present invention relates to an optical disc memory that is a portable and thin information processing device and has backward compatibility.

[Conventional technology]

2. Description of the Related Art As the information society progresses, optical disks, which are large-capacity memories, are becoming more widespread. Optical disk memories are divided into read-only types, write-once types, and rewritable types. In the read-only type, as typified by compact discs, the recorded information is recorded in the form of convexes and convexes on a substrate using a stamper or the like, so that memory media can be supplied inexpensively and in large quantities. It can be supplied inexpensively and in large quantities as a memory medium for commercially available software such as game software, image processing software, and word processing software.
Moreover, a read-only optical disk is suitable because it has high reliability of stored information against heat and external magnetic fields.

On the other hand, the write-once type and rewritable type record information by heating a thin film of recording material by irradiating it with laser light to cause bit formation, phase change, or magnetization reversal. Demand for memory media is becoming higher and higher. However, in the read-only optical memory described above, a metal film such as An is formed on the substrate so thickly that almost no transmitted light is transmitted, and the reflectance is as high as 75% or more. In addition, write-once and rewritable optical memories need to have a high absorption rate in order to effectively utilize the thermal energy of the irradiated laser beam, and the reflectance is 15 to 30%.
The degree is low. For this reason, it has been difficult to use read-only type, write-once type, and rewritable type optical disks in common in the same optical disk device. In particular, lower-level read-only optical disk devices have been unable to read information recorded on write-once and rewritable optical disks.

Conventionally, some write-once type and rewritable type optical disks have a ROM portion formed in a part of the disk by forming pre-pits or the like. However, the ROM portion of these disks basically has the same structure as the write-once and rewritable portion due to the purpose of keeping the reflectance constant and production costs, and has a film structure containing recording material. . In other words, in the ROM portion of conventional write-once and rewritable optical disks, the optical characteristics of the recording material change due to temperature, external magnetic fields, recording beam irradiation due to malfunction of the optical disk device, etc., resulting in information loss or the quality of the information. may be degraded and cause playback errors.

The ROM type optical disk handled in the present invention has a film structure that does not contain a recording material like a compact disk or a laser disk, and is a read-only optical disk with high reliability of recorded information, and is a conventional write-once type and rewritable type optical disk. This is different from the ROM in .

On the other hand, laptop computers and portable optical disk devices are demanding thinner optical disk media. Conventionally, there is a thin card-sized optical disk memory disclosed in, for example, Japanese Patent Laid-Open No. 60-79581. This is a disk-shaped optical memory medium rotatably housed in a credit card-sized case, making it easy to handle. Furthermore, by entering the laser beam through the transparent opening of the case, the case can also serve as a part of the 1.2 mm thick transparent substrate, making it possible to make the optical disc thinner. However, in the conventional disk-type optical memory medium rotatably housed in a card-sized case, it has not been possible to realize an optical memory medium that is compatible with read-only, write-once, and rewritable types, and an optical memory system using the same. Not yet.

[Problem to be solved by the invention]

As described above, conventionally, it has been difficult to achieve device compatibility between read-only, write-once, and rewritable optical disks due to the difference in reflectance of the optical disks.

In particular, since backward compatibility has not been achieved, it has been impossible to reproduce information on write-once and rewritable optical discs using read-only optical disc devices.

In addition, optical disks are replaceable memory media with a large memory capacity, but their packages are larger than floppy disks, IC cards, etc., and they are required to be thinner as memory for laptop computers and other portable information processing devices. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide an optical disc memory system that is compatible with read-only, write-once, and rewritable media, and an information processing apparatus using the same.

[Means to solve the problem]

In order to achieve the above object, the present invention functions for ROM type, write-once type, and rewritable type optical disk memories whose disk reflectance exceeds 50%, and is capable of recording or reproducing necessary information on the optical disk memory. an optical head; means for accommodating one of the ROM type, write once type and rewritable optical disk memory in a predetermined relationship position with the optical head; and one of the ROM type, write once type and rewritable type optical disk memory.
a rotation means for rotating the optical disk memory; a drive circuit for controlling the operation of the optical head and the rotational speed of the rotation means; and a processor for giving commands to the drive circuit; An information processing apparatus is provided, which includes an input means for inputting information to the processor, and an output means for outputting information from the processor.

Furthermore, the optical disk memory according to the present invention achieves compatibility of disk media by making the reflection of a read-only optical disk the same as that of a write-once and rewritable optical disk.

Here, let's define the reflectance of an optical disc to avoid misunderstandings. In read-only optical discs, information is generally recorded on a substrate in the form of concave and convex portions, so that the reflectance of the concave portions is reduced during reproduction. The reflectance of the portion where no information is recorded is determined by the film structure of the read-only optical disc, and the reflectance of the convex portion is approximately the same.

Hereinafter, unless otherwise specified, the reflectance of a disk refers to the above-mentioned reflectance determined by the film structure of the optical disk.

Next, in order to ensure reflectance compatibility among read-only type, write-once type, and rewritable type optical disks, which is the object of the present invention, a reference value of reflectance is determined. Compared to write-once optical discs, such as the hole-drilling type, crystal-
In rewritable optical discs such as amorphous phase change type optical discs, the reversible state change of the recording material is utilized, so there are significant restrictions on setting the reflectance of the disc. Therefore, 5bzTe, which is one of the crystal-amorphous phase change type optical recording materials,
We designed a rewritable optical disc with high reflectance using a. Figure 2 shows the result of the optical design. The composition of the disk is glass substrate/S i N interference film (180 nm)/5
bzTes recording film/SiN interference film (180nm)
/Au reflective film (100 nm), the relationship between the film thickness of the 5bzTes recording film and the reflectance of the disc in each of the crystalline and amorphous states was calculated. The real part n and imaginary part of the refractive index of the 5b2Tes recording film have n=5.3 in the crystalline state and the amorphous state, respectively. = 5.8, and n
=5.0. = 2.7. As shown in Figure 2, by setting the film thickness of the 5bxTes recording film to 40 nm, the reflectance is 57% in the crystalline state and 28% in the amorphous state, realizing a rewritable optical disc with sufficient reflectance contrast. can.

From this result, in order to construct an optical memory system that is compatible with the reflectance of the read-only type optical disk of the present invention and the write-once type and rewritable type, the reflectance of the read-only type optical disk is 57%, taking into account the error. This is possible if the amount exceeds 50%. However, in consideration of the utilization efficiency of the thermal energy of light, etc., it is desirable that it be about 52% to 60%.

In the optical disk memory system of the present invention, which is compatible with read-only, write-once, and rewritable media, the write-once optical recording medium is made of inorganic materials based on Te, etc., or organic materials such as cyanine-based, naphthalocyanine-based, etc. Use materials. In addition to the In-5b-Te-based recording materials mentioned here, rewritable optical recording media include crystal-amorphous phase change materials such as Ge-8b-Te, In-5e-Tfl, and 5b-Te. Recording material or T b −F e
A magneto-optical recording material such as -Co type or Gd-Fe-Co type is used.

In addition, by incorporating the read-only optical disc of the present invention into a credit-sized card and using it in a card that allows playback light to enter through a part of the transparent part of the case, it can be used as a thin and easily handled optical memory medium. can be realized. This has made it possible to realize compact memory with a capacity of 30MB to 50MB.

[Effect]

The reflectance of conventional ROM-type optical discs is over 75%, which is 2 to 2% higher than that of write-once and rewritable optical discs.
It was about three times bigger. For this reason, it is difficult to ensure compatibility of discs, and in particular, lower-level read-only devices have been unable to read information recorded on write-once and rewritable optical discs. Therefore, in the present invention, a reflective film with low reflectance such as Ni-Cr is used instead of AQ or Au used for the reflective film of conventional read-only optical discs, or a dielectric film is used between the substrate and the reflective film. It is possible to make the optical disk the same as a write-once type and a rewritable type optical disk by inserting a disc and reducing the reflectance of the disk by optical interference. This makes it possible to achieve disk compatibility and provide an optical memory system with backward compatibility of the device.

Further, by rotatably enclosing the optical disk of the present invention in a credit-sized card, it is possible to realize a thin and easily handled optical memory medium.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

3 and 4 are cross-sectional views showing examples of the film structure of an optical disk suitable for carrying out the present invention.
0 represents a transparent substrate such as glass or plastic, 141 represents a dielectric interference film, and 144 represents a reflective film such as metal. The reproduction light enters from the transparent substrate 130 side like a general optical disc.

FIG. 5 shows the results of analyzing the characteristics of such a disk using a computer. Calculations are performed taking into account multiple interference of light, and the refractive index of each layer is determined based on the results of creating a sample by vacuum-depositing a film on a glass substrate and measuring the reflectance and transmittance with a spectrophotometer. It was estimated that

FIG. 5(a) shows the relationship between the thickness of the reflective film and the reflectance of the disk when the reflective film 144 is made of Au, AQ, and Ni-Cr in the film configuration shown in FIG. When the thickness of the reflective film is as thin as 50 nm or less, the reflectance of the disk increases as the thickness of the reflective film increases. When the thickness of the reflective film increases to 1100 nm or more, the reflectance of the disk becomes approximately constant. This constant value varies depending on the material of the reflective film, and is approximately 95% for Au and approximately 80% for AQ.
In the case of Ni-Cr, it was about 58%. From this result,
In order to increase the reflectance of the disk to over 50%, the thickness of the reflective film should be reduced to 50 nm or more.

Alternatively, it can be seen that a Ni--Cr reflective film may be used.

By a similar method, it is possible to realize a ROM disk with a reflectance of 50% or less by selecting the material and thickness of the reflective film used. When an Au film is used as the reflective film, the film thickness of the Au film should be approximately 20 nm to achieve a disc reflectance of 50%, but the film thickness dependence of the disc reflectance is approximately 30 nm.
%/10 nm, so care must be taken to ensure high manufacturing accuracy in the quality and thickness of the reflective film. In comparison, when a N j, -Cr film is used as the reflective film, if the film thickness is greater than 1100 nm, the reflectance of the disk is approximately 58
%, and the control accuracy of the film thickness may be low, making it easy to create a disk. In this case, it is difficult to freely set the reflectance of the disc, so it is necessary to change the reflectance by changing the material of the reflective film.

As described above, from the viewpoint of ease of disk production, the thickness of the metal reflective film is preferably ↓OOnm or more, and a film configuration that can finely adjust the reflectance of the disk is desired. Therefore, for a disk with a film structure that can change the reflectance of the disk using optical interference, that is, a film structure using a dielectric interference film as shown in Fig. 4, the reflectance and the thickness of the interference film are The relationship is shown in FIG. 5(b). Here, the reflective film is made of Au, AQ, and Ni- with a film thickness of 100 nm and 100 m.
The relationship between the reflectance of the disk and the thickness of the interference film was calculated for the case where a dielectric film with a refractive index of 2.0 was used as the Cr film and the interference film. The materials of the dielectric interference film used here are ZnS, SiaNa, AQ 20g
? ARN, Taxes, etc. are good. These have a refractive index of approximately 2
It is relatively large, and a high-quality film can be easily formed by sputtering or the like. Even among the same dielectric materials, SiO, 5iOz, etc. have a refractive index of about 1.5, which is close to the refractive index of the transparent substrate, so there is almost no reflection at the interface between the transparent substrate and the dielectric interference film, and no effective optical interference effect can be expected.

As shown in FIG. 5(b), by adding a dielectric film, light interference occurs and the setting range of the reflectance of the disk can be expanded. In this case, the reflectance of the disk changes by changing the thickness of the interference film, and the rate of change is 5%/l even in the case of the largest Ni-Cr reflective film.
On m or less.

This rate of change is smaller than that in the case of only the reflective film described above, so the accuracy of the film thickness can be made less precise, which facilitates fabrication.

The film structure of the ROM type disk described here is the minimum necessary, and in addition to this, a protective film is often added to protect the disk. Further, it is necessary to record on the disk guide grooves for continuous servo, wobble pits and clock pits for sample servo, address information of the data area, software information provided to the user, and the like. Generally, these are formed in advance in the form of irregularities on the substrate using a stamper or the like, so that the reflectance of the recesses is reduced during disk reproduction. The gist of the present invention is that the ROM type disk is constructed with a film so that the reflectance is 50% or less, and it is also possible to add other films, holding materials, etc. within a range that does not affect the optical characteristics.

By using the ROM type optical disk of the present invention and storing it in a credit card-sized case, it is possible to construct a thin and easily handled ROM type optical disk memory medium and an optical memory system using the same. This new optical memory system will be explained below.

FIG. 6 shows an embodiment of an optical memory medium in a transparent protective case (hereinafter referred to as "optical disk-in card") suitable for realizing the optical memory system of the present invention. As shown in the figure, an optical disk-in card 10 of this embodiment
0, the optical disc 140 is housed in card-sized protective cases 120 and 121. Here, the optical disc 140 is located at least at the light beam incidence part 1 of the protective case.
52 is constituted by a transparent protection plate.

In conventional optical disk devices, the door of the protective case is opened to allow light to enter the optical disk directly. For this reason, since dust and dirt enter through the light entrance door, it is necessary to use a 1.2- transparent substrate as a countermeasure.

On the other hand, in the optical disc memory of the present invention, the light incidence section 1
52 is covered with a transparent protection plate 120, dust and dirt will not adhere directly to the optical disc, and therefore, the thickness of the substrate for supporting the optical disc medium will be 1 mm.
．． There is no need to have 2owa. The thickness of the case is approximately 0.2
nwn, the thickness of the substrate can be reduced to 1 m or less.

Further, in the optical disk memory of the present invention, the optical disk 140
is fixed to the protective case 120 so that it can rotate freely on the chair.

The optical disk-in card of the present invention is small and lightweight.

Because it is thin and easy to handle, it can be used for stationary or laptop-type personal computers, workstations,
For systems used as a common memory medium in word processors, fax machines, copy machines, video game machines, telephones, electronic still cameras, video cameras, portable music players, electronic planners, calculators, measuring instruments, visual presentation devices, etc. suitable. An example of such an optical memory system is shown in FIG. By using a compatible optical disk device, each device can share the optical disk-in card as a memory medium.

Each device can also have a built-in compatible optical disk device. In this case, since each device has a different shape, it is desirable that the built-in optical disc-in-card playback device also have a high degree of freedom in layout. An example for meeting this requirement will be shown below.

FIG. 7 shows an embodiment in which the light incident section 152 of the optical disk-in card covers the entire surface of the optical disk 140. This allows optical head access from any position in the circumferential direction of the optical disc. That is, it becomes possible to incorporate an optical disc-in-card playback device into various devices in which the degree of freedom in the layout of playback devices is increasing.

FIG. 8 shows an example of a specific configuration of an information processing apparatus using the optical disk-in card shown in the drawing. The information processing device of the present invention includes an optical disk-in card 100. Optical disk drive 200. Processor 400. Input means 5
00. It is constituted by an output means 600. The optical disk-in card 100 is composed of an optical disk 140 and a protective case 120, and is removable from the optical disk drive 200. In addition, optical disk drive 200
is the optical head 210. It is composed of a motor 240 for rotating the optical disk 140 and a drive circuit 260 for controlling the optical head 210 and the motor 240. The drive circuit 260 controls the rotation speed of the motor 240 according to instructions from the processor 400, and also performs the function of demodulating reproduced data. The processor 400 performs arithmetic processing or reproduces information from the optical disc 140 based on instructions from the input means 500, and outputs the output means 6 as necessary.
The contents recorded on the optical disc 140 or the calculation results are outputted via 00.

9 and 10 provide a detailed explanation of the present invention. This allows the optical disc to be made thinner.

The present invention provides a substrate 130 that supports a recording medium 148. It consists of protective cases 120 and 121 for protecting it, a motor 240 for rotating the disk, and an optical head 210. The optical head 210 is described, for example, in Nikkei Electronics, No. 199-213, November 21, 1983.
The conventional optics shown on the page may be used. Further, although the optical disc is fixed to and rotated by a rotating shaft 241, it is held down by a disc holder 242 in order to rotate stably. Moreover, since the protective case 121 is not a light entrance part, it may be transparent or opaque.

With such a configuration, playback of an optical disc is realized as follows. That is, the power of the semiconductor laser is set to approximately 1 mW on the information recording surface, and by continuous irradiation with this laser, the information recorded on the optical disk is reproduced as a reflectance signal. Drive circuit 26
It is possible to demodulate with 0 and read the necessary information.

Here, the feature of the present invention is that the recording medium 145 is irradiated with laser light through the transparent protective case 120. That is, according to the present invention, it is possible to prevent dust in the air from adhering to the substrate 130 and the recording medium 148, and to reduce the total thickness d2 of the transparent protective case 120 and thickness dL of the substrate 130 to approximately 1.2 nm or less. Can be done. For example d2
If it is set to 0.2 volumes, dl can be reduced to about 1 m++ or less, and the substrate, which was conventionally considered indispensable to be 1 or 2 volumes thick, can be made thinner.

This has two effects: That is, the drive device 200 is made smaller and its power consumption is reduced. Board 13
0 becomes thinner, the rotational inertia of the disk 140 becomes smaller, and the output of the remoter 240 becomes smaller, so the motor 2
40 can be made smaller and lighter. Further, when the sum of the thickness d2 of the transparent protective case 120 and the thickness cit of the substrate 130 becomes thinner, the focal length of the objective lens of the optical head 210 becomes shorter, and the diameter of the objective lens and the beam diameter can be reduced. At the same time, since all the optical elements in the optical head can be made smaller, the optical head 210 can be made smaller and lighter. In other words, the entire optical disk drive device can be made smaller and lighter, and power consumption can be reduced.

FIG. 10 shows an embodiment in which light is incident from the recording medium 148 side. At this time, a material that does not transmit light can be used for the substrate 130. In addition to conventional glass and transparent plastics, metals such as stainless steel and opaque plastics such as polystyrene can be used as substrate materials.

When using a metal substrate such as stainless steel, it not only has higher thermal conductivity and higher heat resistance than glass or transparent plastic, but also has greater mechanical strength, making it suitable for forming reflective films etc. using vacuum processes such as sputtering. It is possible to reduce warpage of the board. Opaque plastics such as polystyrene are used as substrates for magnetic floppy disks.
If this is used as a substrate, it is possible to supply optical disk-in cards at low cost.

FIG. 11 shows a film structure of an optical disc suitable for the tenth embodiment. The optical disc consists of a substrate 1302, a reflective film 141. It consists of an interference film 144 and a transparent protective film 145. Since light enters from the protective film 145 side, the reflection film 141 and interference film 14
4 is characterized in that the configuration is opposite to that of the embodiment shown in FIG. The transparent protective film 145 has the same effect on dust prevention as the transparent substrate of a conventional optical disk, so when the diameter of the attached dust is about 1 μm, it needs to be at least 10 μm or more. The material of the protective film 145 is UV resin or Si○.
A transparent dielectric material having a refractive index of about 1.5 or less is suitable for the two films.

FIG. 2 shows the configuration of an optical disk-in card of the present invention suitable for improving the efficiency of light use. As shown in the figure, the light from the semiconductor laser light source of the optical head is focused onto the optical recording medium 148 by the objective lens 219, but some of it is reflected by the surfaces of the protective case 120 and the substrate 130 and reaches the optical recording medium 148. It does not reach. This reflectance is 3 to 4 per surface.
It is about %. Therefore, anti-reflection coating (AR coating)
123 and 124 can be applied to reduce reflection by the protective case 120 and increase the light utilization efficiency of the optical system. The refractive index of the anti-reflection coating is JT, where n is the refractive index of the protective case, and the film thickness is mλ/4n, where λ is the wavelength of the light source, m =
1.3,5. ...is...

For example, if the protective case is made of transparent plastic with a refractive index of about 1.5, the antireflection coating can be made of MgFz (refractive index 1.38), which is the same as general optical glass.

FIG. 13 shows an embodiment of a disc format suitable for recording code data on the ROM type optical disc of the present invention. Here, the ISO standard 5.25 inch 180
The format of the optical disk-in card was based on the format of the 0 rpm sample servo disk.

The optical disk shown in the figure has a diameter of 48 mm so that it can be built into a credit card. Data structure is 16 sectors/
track, 43 segments/sector, 18 bytes/segment. The user area is 512 bytes per sector, and the servo area is 2 bytes per segment. The data area of the disk is 30 to 4.6 mφ, I
-If the rack pitch is 1.5μm, the number of tracks is approximately 5
300, the memory capacity is 43 megabytes per side, the disk rotation speed is 3600 rpm, and the data transfer rate is 3.9 megabits/second.

The modulation method is 4-15 modulation, and track and sector addresses are recorded in the header at the beginning of the sector. Error correction code (FCC) is in 4-2 format,
The code calculation method is assumed to be two repetitions of C1-C2. In addition to this, a disk format that combines a continuous servo system and a 2-7 modulation system is also widely used, and can be used in the optical disk-in card of the present invention.

Next, embodiments will be described of write-once and rewritable optical discs suitable for realizing an optical memory system compatible with read-only, write-once and rewritable discs of the present invention. In the optical disc memory system of the present invention, which is compatible with read-only, write-once and rewritable media, it is used as a write-once optical recording medium.

Inorganic materials based on Te etc. or cyanine-based materials,
Organic materials such as naphthalocyanine can be used. Also, as a rewritable optical recording medium, G e -S
b-Te system, In-8b-TQ system.

Crystal-amorphous phase change recording materials such as In-3b-Te system, 5b-Te system, or Tb-Fe-Co system,
A magneto-optical recording material such as Gd-Fe-Co may be used. That is, any medium that can be reproduced or recorded and erased by laser light can be used as the medium of the present invention.

Here, an example of recording, erasing and reproducing using a 5-rewrite type phase change optical disk will be described. FIG. 14 shows the principle of recording, erasing and reproducing on a phase change optical disk.

As shown in the figure, recording is achieved by irradiating a recording medium with a relatively high-power laser beam and rapidly cooling the recording film in a melter to turn the recording film into an amorphous state.

On the other hand, erasing is achieved by irradiating the recording film with relatively low power laser light to crystallize the amorphous recording film. Furthermore, for reproduction, the recording medium is irradiated with continuous light of even lower power, and information is reproduced based on the difference in reflectance between the amorphous and crystalline states.

As recording films, Proc, Soc, Photo-
Opt, In5t.

EngJSPIE) VoQ, l O78, pp, 11
-pp, 26.

(1989), In-5b-Te-based film B, or Proc, Sac, Photo-O
pt.

In5t, Eng, (SPIE) VoQ, 1.07
8, pp. 27-pp.

Any phase change medium can be used as long as it has an overridable recording film such as that described in J.D. 34 (1989).

FIG. 15 shows the crystallization rate of In-3b-Te based material for this recording film.

The crystallization speed varies depending on the composition of the material, ranging from 50 ns to 5
It has a crystallization rate of 00ns. The crystallization speed to be adopted varies somewhat depending on the linear velocity v (m/s) of the optical disk and the film structure of the optical disk medium.
Approximately 500/v (ns) to l 500/v (n, s)
It is desirable to employ a recording film having a crystallization rate in the range of . Further, FIG. 16 shows a film structure suitable for use as the optical disk medium of FIG. 9. Optical disc media.

Light-transmissive substrate 130. First optical interference film 141. Recording film 1
42. Second optical interference film 1432 Reflection film 144° Protective film 14
It consists of 5. In this way, in an optical disk medium, light is incident from the substrate side.

On the other hand, FIG. 17 shows a film structure suitable for use as the optical disk medium of FIG. 10. In this case, since the laser light is incident from the protective film, a feature is that the order from the first optical interference film 141 to the reflective film 144 is reversed. Here, the interference film functions as a film that improves contrast through optical interference and controls heat conduction properties.

FIG. 18 shows a method of modulating laser power during override. That is, during override, the laser power is modulated between the power level for erasing and the power level for recording. At this time, the laser power for erasing is selected from the power that can crystallize the recording film if this power is continued to be irradiated, and the laser power for recording is selected from the power that can make the recording film amorphous. In order to realize such laser power modulation, the drive circuit 2 in the optical disk drive device shown in FIG.
60 modulates laser power for recording and erasing and modulates data in response to instructions from the processor 400.

FIG. 19 is an embodiment showing a film structure of a write-once optical disc suitable for realizing the present invention. A hole is formed in the recording film 142 by laser beam irradiation.

The recording material is Te and a Te-based alloy (Se
, As, Sb, In, Sn, Pb, Bi), cyanine-based, phthalocyanine-based, and naphthalocyanine-based organic dyes can also be used.

Since all the optical disks described in the above embodiments record information in the form of reflectance, compatibility of optical disk devices can be maintained relatively easily by unifying the reflectance. In the present invention, it is also possible to use a magneto-optical rewritable optical disk. however.

In this case, care must be taken because the information is recorded in a different format and is recorded on the disk as the direction of the magnetic domain.

FIG. 20 shows an example of an optical head optical system of a conventional optical disk device, which can be used in the optical head of the present invention. This is shown on pages 189 to 213 of Nikkei Electronics, No. 11, 21, 1983. As shown in the figure, the optical disc is composed of a substrate 130 and a recording film 142, and track guide grooves with a pitch of 1.6 μm are formed in the substrate 130.

On the other hand, the optical head includes a semiconductor laser 211. Coupling lens 212 for creating parallel light. Beam splitter 2
14. A galvanometer mirror 218 for changing the optical path, and a focusing lens 219 for focusing the light onto the disk. A condenser lens 220 for concentrating the light from the beam splitter 214 into the optical sensor system, and a half mirror 222 for separating the light into a tracking signal detection system and a focus signal detection system.
It is composed of a cylindrical lens 223 for detecting a focus signal, an edge prism 224, and sensors 221a and 221b for detecting focus and tracking errors.

The light emitted from the semiconductor laser 211 in the optical system having such a configuration is reflected by the beam splitter 214 and focused by the objective lens 219 onto the recording film 142 of the optical disk. Also, the light reflected from the disk is transmitted to the beam splitter 2.
14 and is measured as a focus error signal by the sensor 221a. If there is an error in focus, although not shown, feedback is given to the actuator for driving the objective lens 219, and the position of the aperture lens 219 is moved to the in-focus position. Further, the sensor 221b detects a tracking error signal, and rotates the galvanometer mirror 218 to track the guide groove.

In this state, the optical head records and reproduces signals while performing focus control and tracking control.

FIG. 21 shows an example of a thin optical head suitable for implementing the present invention. Conventional optical heads have an actuator for driving the objective lens for focus control, but this actuator makes it difficult to make the optical head thinner. In the optical head of the present invention, focus control is realized by stopping the actuator for the objective lens 219, providing a relay lens 216 instead, and moving this in a direction parallel to the disk. In addition, a normal objective lens uses multiple lenses to compensate for aberrations on the disk, but here, a part of the lens is divided and moved to the entire surface of the raising mirror 218, and a thin part of the optical head is used. We are trying to make this happen. Other functions are equivalent to conventional optical systems, so detailed explanations will be omitted.

FIG. 22 provides a detailed explanation of the optical disk drive circuit system 260 in FIG. 8.

The optical disk drive circuit system 260 includes the data management section 26
1. Track address control section 262. h rack control section 263. Focus control section 264. Photodetection amplification section 265
．． Data demodulation section 266, data modulation section 267, laser drive 268. It is composed of a motor control section 269.

With such a configuration, when overriding, the track address control unit 262 determines the track address to be recorded, and
1 (Q
11, 11 l Convert to 11 patterns. Modulation methods include 2-7 modulation and 4-15 modulation, which are used depending on the system. In the laser drive 268, the IIO" determined by the data modulation section 267,
The laser power is modulated between erasing power and recording power according to the 1" pattern as shown in FIG. 10. Also,
When reproducing data, the track address specified by the processor 400 is selected, the laser power is set to a constant value of about 1 to 2 mW, and the optical detection amplifier 265
A reflectance of 0 is read out, and the data is demodulated by the data demodulating section 266. The results of the photodetector amplifier 265 are also used as signals for the track control 263 and focus control 264, but these functions can be realized by functions conventionally used in compact discs and optical disc devices. Further, the motor control unit 269 controls the rotation speed of the motor 240 for rotating the optical disc 140. For this rotation speed control, CA V (Constant Angu
lar Velocity) control and CL V (Con
There is a stunt linear velocity) control type.

FIG. 23 shows another embodiment of an optical disk-in card 100 for implementing the present invention.

The basic configuration is the same as the configuration shown in FIG. 6, in which the light incidence part is covered with a transparent protective case, but the feature of the embodiment shown in FIG. 23 is that a protective cover 160 is further provided. be. Since the optical disc-in-card 100 of the present invention is carried freely, the card 120 may be scratched. There is no problem even if the card case is scratched in areas other than the light entrance part, but if the light entrance part is scratched, the card case may need to be replaced. The present invention aims to reduce the number of card case exchanges. That is, by providing the protective cover 160 on the card case 120, the light entrance part is prevented from being scratched, and when the optical disk-in card is inserted into the optical disk drive 200, the protective cover 160 is opened to allow light to enter. We are making it possible to do it freely.

FIG. 24 shows another embodiment of the optical disc-in-card 100. FIG. 24 shows the transparent protection plate 12
0 and a card-sized optical disc with a protection plate 121. The protective plates 120 and 121 are approximately 0.5
The film thickness is 1.2 m from 120. ↓21
An optical disk 140 (not shown) is built in and is sandwiched between the two. Further, 170 fixes the optical disc 140 to a rotating shaft.

It is a magnetic clamp for rotation. FIG. 25 shows a cross-sectional structural view taken along line AA' of this optical disc. The optical disc 140 is fixed by a magnetic clamp 170 and is separated from the protection plates 120 and 121.

Also, Fig. 25-a shows the circle B part, and Fig. 25-b shows the 25th circle B part.
The circle C section in the figure is shown in more detail. While the optical disk 140 is rotating, the optical disk 140 and the substrate 130 are in a floating state from the protection plates 120 and 121.

FIG. 26 shows an example of an optical disc built into this disc-in card 100. This example is characterized by having a magnetic clamp 170 in the center for fixing the disk to the rotating shaft of the motor.

FIG. 27 shows a method for preventing dirt and dust from entering the recording area. In the present invention, since the light incident part is covered with a transparent protective cover, dirt and dust do not directly enter the recording area, but since the center of the disc is open for rotation, There is a possibility that dirt and dust may enter from this central part. Therefore, in the present invention, a dustproof mat 125 is placed in the non-recording area to prevent dirt and dust from entering from the center of the disk.

FIG. 28 shows an example of other dustproof measures.

In the example shown in FIG. 25, since the center of the disk was open, there was a concern that dirt and dust might get mixed in.

In contrast, this embodiment is characterized in that a bearing 126 is provided at the center of the disk, eliminating the need for an open section.

FIG. 29 shows another embodiment regarding the card shape. In the embodiments shown in FIGS. 6 and 7, the case where the card shape is equivalent to that of a credit card has been explained, but the card may have any shape as long as it can accommodate an optical disk. . FIG. 29 shows an example of a substantially square card. Further, in the present invention, an example is shown in which the size of the optical disk is approximately 50 mm, but the size can be changed as necessary. In other words, 12 inches and 8 inches, which have been under development for some time.

The present invention can be applied to any size such as 5.25 inches, 5 inches, and 3.5 inches.

FIG. 30 shows an embodiment in which the present invention is applied to a laptop computer. Laptop computer 400. It is composed of a processor unit 401 and a semiconductor main memory 402, and is connected to a keyboard 410° display 420 via a system bus 403. The feature of the present invention is that an optical disk-in card is connected via an optical disk-in card interface 404. At the point where drive 200 is connected. The optical disc-in-card 100 of the present invention has a large capacity of approximately 50 MB despite its small external size of approximately 50 mm, which allows it to perform large-scale calculations comparable to that of a mini computer even though it is a laptop computer. processing is possible. In addition, optical disk in card 100 drive 2
It is removable from the 00, making it a convenient system to carry.

FIG. 31 shows an embodiment in which the present invention is applied to a camera. For basic signal processing, the signal processing of an electronic still camera using a floppy disk can be used.

Signal processing for electronic still cameras is provided by Nikkei Electronics.
As described on pages 195 to 201 of the 1988.12. A feature of the present invention is that an optical disk-in card 100 is used as a signal recording medium.

The optical disk-in card 100 of the present invention not only has a large capacity but also has an optical disk built into a transparent protection card, so it is easy to handle and has high reliability. The specific operation will be explained according to the diagram. In the figure, CCD
The electric signal photoelectrically converted by the MOS solid-state image sensor 501 is subjected to FM modulation. On the other hand, data such as dates are stored in DPS.
K (differential phase 5hif)
(block 504) and recorded on the optical disk-in card 100 via the optical disk-in card drive 200.

On the other hand, during playback, images are demodulated by an FM demodulator 505, data is demodulated by a data demodulator 506, and converted into a video signal such as NTSC by a video signal converter 507.

FIG. 32 shows an optical disc-in-card 100 connected to a laptop computer 500 and a terminal 523 of a large-scale computer @521.
An example of using it as an interface is shown. In the figure, a large computer 521 usually has a large capacity memory 522 such as a magnetic disk, and is connected to and used by many terminals 523 via a network 524 and a station 525. However, such a system has the problem that it cannot be used in places where there is no terminal. The present invention has been devised to solve such problems.The optical disk-in card 100 of the present invention is used in a laptop-type computer 500, and the optical disk-in card 100 of the present invention is used as a memory in a terminal 523 of a large computer. 100 is used. In this way, the optical disk-in card 100 is connected to the laptop computer 50.
By sharing the memory of 0 and the terminal 523 of a large computer, it is possible to create programs and unpack even on the train at home without a terminal.

FIG. 33 shows an application example of the optical disc-in-card 100 when security is required for memory. Although the optical disc 140 has a large capacity, it is possible to examine what data patterns are recorded using a microscope with a large magnification. Not only can security be ensured by using random number codes, but also a higher level of security can be ensured by mounting a semiconductor memory on the card. In this case, a distant relationship can be achieved by providing a semiconductor memory area 11A 71 as shown in FIG. If such a high level of security can be achieved, the optical disc-in-card 100 can realize a cash car 1 or information that requires secrecy, such as a portable personal medical database. In this case, the hardware configuration shown in FIG. 8 can be used.

FIG. 34 shows another embodiment of the optical disk-in card 100 suitable for realizing the present invention. As shown in FIG. 9, in the present optical disk-in card 100, the optical disk medium 140 is Protective case size 120.1
It is housed in 21. Further, the protective case is provided with a window 150 for the entrance of light, and the optical disc is usually covered with a cover ↓60.

Here, the optical disk-in card 100 is connected to the drive 200.
When set, the door 160 of the protective case is opened to allow light to enter directly into the 5-optical disk substrate, and in the case of a magneto-optical disk, the magnetic field generating means is used close to the optical disk. FIG. 35 shows the appearance of the optical disk-in card 100 when the window cover 160 is opened. When the window cover 160 is opened, the optical disk 140 is exposed and the optical head can directly access the optical disk. .

〔Effect of the invention〕

According to the present invention, the reflectance of a read-only optical disc can be increased to 50
% and have the same reflectance as write-once and rewritable optical discs, disc compatibility can be achieved.
It is possible to provide an optical memory system and an information processing device that are backward compatible.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the medium-compatible optical memory system of the present invention, and FIG. 2 shows the recording film thickness of an optical disc and the disc of an embodiment of the optical design of a rewritable optical disc using a 5b2Tea recording film. 3 and 4 are cross-sectional views showing an example of the film structure of a read-only optical disc suitable for the present invention, and FIGS.
b) is an example of the optical design of a read-only optical disc suitable for the present invention, and is a graph showing the relationship between the reflectance of a disc with a metal film and the film structure 1; Figs. 6(a) and 7() ) is a plan view showing the structure of the optical disk-in card according to the embodiment of the present invention, and FIGS. 6(b) and 7(b) are the optical disk-in cards of FIGS. 6(a) and 7(a). FIG. 8 is a block diagram showing an example of the configuration of an information processing device according to an embodiment of the present invention, and FIGS. 9 and 10 are cross-sectional views showing the structure of the cart. FIG. 11 is a cross-sectional view showing an example of the film structure of a read-only optical disk suitable for lIP according to the present invention, and FIG. 12 is a partial cross-sectional view showing an example of applying an anti-reflection coating to the protective case of the optical disk in-cart of the present invention. Partial sectional views showing an example of the case, FIGS. 13(a) and 13(b)
, (c) is a developed view showing a format 1 example of the optical disc-in-card of the present invention, FIG. A diagram showing the crystallization rate of an In-5b-Te recording medium, which is an example of the material used for this purpose, FIGS. 16 and 17 are cross-sectional views showing an example of the multilayer film structure of a phase change optical disc, and FIG. FIG. 19 is a cross-sectional view showing an example of the film structure of a write-once optical disk suitable for the present invention, and FIG. 20 is an example of the structure of an optical disk and an optical head of a conventional optical disk system. FIG. 21 shows an embodiment of an optical head suitable for realizing the present invention, and FIG. 22 shows an embodiment of a drive circuit system necessary for realizing the present invention. FIG. 23 is a block diagram and a plan view showing another embodiment of the optical disk-in card. FIG. 24(a) is a plan view showing an embodiment of an optical disc-in-card using a magnetic clamp, and FIG. 24(b)
and (c) are its cross-sectional views, Fig. 25-a, Fig. 25-b
, FIG. 25-C is a sectional view for explaining the details of the optical disc-in-card shown in FIG. 24, and FIGS.
Figure 4 is a plan view and cross-sectional view showing an example of an optical disk built into an optical disk-in card, Figure 27 is a partial cross-sectional view showing an example of measures to prevent dirt and dust from entering the recording area of the optical disk, and Figure 28 is a partial cross-sectional view showing an example of measures to prevent dirt and dust from entering the recording area of the optical disk. FIG. 29(a) is a partial cross-sectional view showing another example of measures to prevent contamination, and FIG. 29(b) is a plan view showing another example regarding the shape of the optical disc-in-card.
(C) and (d) are cross-sectional views, Figure 30 is a block diagram showing an example of the equipment configuration when an optical disc-in card is applied to a laptop computer, and Figure 31 is an application of an optical disc-in card to a still camera. Fig. 32 is a block diagram showing an example of the equipment configuration when an optical disk-in card is used as an interface memory between a large computer terminal and a laptop computer, and Fig. 33 is a block diagram showing an example of the equipment configuration when the optical disk-in card is used as an interface memory between a large computer terminal and a laptop computer. FIG. 34 is a plan view showing an example of an improved optical disc-in card with semiconductor memory, FIG. 34 is a plan view of another embodiment of the optical disc-in card of the present invention, and FIG. FIG. 35(b) is a plan view showing the external appearance of the optical disc ink cart when the window cover is opened, and FIG. 35(b) is a sectional view thereof. DESCRIPTION OF SYMBOLS 100... Optical disk in card, 120... Transparent protection card, 140... Optical disk, 200... Optical disk in card drive, 400... Processor, FIG.゜20 60 00 Metal film thickness (nm) (a) For substrate/metal film 0 8゜20 60 2■ Interference film thickness (nm) (b) For substrate/interference film/metal film Refractive index of interference film = Figure 7. Figure 11. Figure 12. Figure 14. Principle of recording, reproduction, and erasing of phase change optical disc. Fig. 16 Fig. 17 Fig. 18 Fig. 9 Fig. 3 (a) Fig. 26-a Fig. 5-b Fig. 5 Fig. 6 Fig. 6 (a) b) Figure 8 Figure 9 (a) (d) Figure 1 Figure 32 Figure 3 Figure 4 Figure 20

Claims (1)

[Scope of Claims] 1. An optical head that functions for ROM type, write-once type, and rewritable type optical disk memories whose disk reflectance is greater than 50%, and for recording or reproducing necessary information on the optical disk memory. , means for accommodating one of the ROM type, write-once type, and rewritable optical disk memory in a predetermined relationship position with the optical head; rotating means for rotating the ROM type optical disk memory; and operation of the optical head and the rotation. Information processing comprising: a drive circuit for controlling the rotation speed of the means; a processor for giving instructions to the drive circuit; an input means for inputting information to the processor; and an output means for outputting information from the processor. Device. 2. A ROM type optical disk memory with a disk reflectance exceeding 50%, a write once type and rewritable type optical disk memory having approximately the same reflectance as the ROM type optical disk memory, and the ROM type, write once type or rewritable type. an optical head that reproduces information recorded on the optical disk memory and/or records information on the write-once type and rewritable type optical disk memory; and the ROM type, write-once type and rewritable type optical disk memory. a rotation means for rotating an optical disk memory; a drive circuit for controlling the operation of the optical head and the rotation speed of the rotation means; a processor for giving commands to the drive circuit; an input means for inputting information to the processor; An information processing device compatible with a ROM type, write-once type, and rewritable type, comprising: an output means for outputting information from a processor. 3. ROM, which is a disk-type optical memory medium that optically records information and is rotatably stored in a credit-sized card.
1. A ROM-type optical disk memory characterized in that the reflectance of the disk-type optical memory medium exceeds 50%. 4. ROM, which is a disk-type optical memory medium that optically records information and is rotatably stored in a credit-sized card.
In a ROM-type optical disk memory in which the reflectance of the disk-type optical memory medium exceeds 50%, the disk-type optical memory medium comprises at least a transparent substrate and a reflective film, and the reflective film comprises a metal film and a dielectric film. A ROM-type optical disk memory characterized in that it is made of either one of these films or a combination of both films. 5. ROM, which is a disk-type optical memory medium that optically records information and is rotatably stored in a credit-sized card.
A ROM-type optical disk memory in which the reflectance of the disk-type optical memory medium exceeds 50%, where information is reproduced by inputting light from a light source through a transparent opening of the credit-sized card. type optical disk memory, wherein an anti-reflection film is formed on at least one surface of the transparent opening on the side of the light source and the disk-type optical memory medium, and on the surface of the transparent opening side of the disk-type optical memory medium. A ROM type optical disk memory characterized by: 6. ROM, which is a disk-type optical memory medium that optically records information and is rotatably stored in a credit-sized card.
In a ROM-type optical disk memory in which the reflectance of the disk-type optical memory medium exceeds 50%, guide grooves or wobble pits for following tracks are formed on the information recording surface side of the disk-type optical memory medium. A ROM type optical disk memory characterized by: 7. ROM, which is a disk-type optical memory medium that optically records information and is rotatably stored in a credit-sized card.
A ROM-type optical disk memory in which the reflectance of the disk-type optical memory medium exceeds 50%, comprising: an optical head for reproducing information recorded on the ROM-type optical disk memory; a rotation means for rotating the optical head; a drive circuit for controlling the operation of the optical head and the rotational speed of the rotation means; a processor for giving commands to the drive circuit; an input means for inputting information to the processor; An information processing device comprising: an output means for outputting; and an information processing device. 8. ROM, which is a disk-type optical memory medium that optically records information and is rotatably stored in a credit-sized card.
A ROM-type optical disk memory, which has a reflectance of more than 50%, and a recordable or rewritable disk-type optical memory medium having approximately the same reflectance as the ROM-type optical disk memory. A write once type and rewritable type optical disk memory rotatably stored in a card of the same size as a ROM type optical disk memory, and reproducing information recorded in the ROM type, write once type and rewritable type optical disk memory; an optical head that records information on the write-once type and rewritable optical disk memory or both; a rotating means for rotating the ROM-type, write-once type and rewritable optical disk memory; and operation of the optical head. and a drive circuit for controlling the rotation speed of the rotation means, a processor for giving instructions to the drive circuit, an input means for inputting information to the processor, and an output means for outputting information from the processor. Information processing device that is compatible with ROM type, write-once type and rewritable type.